Automobile shell structure design method and system based on 3D printing technology

Abstract

The present invention relates to the field of automobile manufacturing technology, and in particular to a method and system for designing an automobile shell structure based on 3D printing technology. The method comprises the following steps: obtaining information data of a user's automobile shell structure and performing functional requirements and structural performance evaluation analysis to obtain automobile shell structure functional requirements data and automobile shell structure performance requirements status data; performing parameter design analysis and 3D simulation modeling analysis on the automobile shell structure functional requirements data and automobile shell structure performance requirements status data to generate a 3D simulation space model of the automobile shell structure; performing 3D printing and manufacturing on the 3D simulation space model of the automobile shell structure to obtain a 3D printing initial model of the automobile shell structure; performing mechanical simulation and simulation testing on the 3D printing initial model of the automobile shell structure and optimizing the shell structure design to generate a 3D printing optimization result of the automobile shell structure. The present invention can realize the personalized design and manufacturing of automobile shell structures.

Description

Technical Field

[0001] The present invention relates to the field of automobile manufacturing technology, and in particular to a method and system for designing an automobile shell structure based on 3D printing technology. Background Art

[0002] Traditional automobile shell structures are mainly manufactured through metal stamping, welding and other methods. These methods are often limited by manufacturing processes, usually costly, with long design cycles and great environmental impact, which leads to increased complexity and cost of structural design. With the development of 3D printing technology, new possibilities have been provided for the design of automobile shell structures. Its application in vehicle manufacturing is increasing, especially in prototyping and the production of complex parts. However, the existing application of 3D printing technology is mainly concentrated on small parts or non-structural parts, and the research on the systematic design and manufacturing of the entire vehicle shell is still relatively insufficient. There are still problems such as complex design process and insufficient structural performance analysis. Summary of the invention

[0003] Based on this, it is necessary for the present invention to provide a method and system for designing a car shell structure based on 3D printing technology to solve at least one of the above technical problems.

[0004] To achieve the above purpose, a method for designing a car shell structure based on 3D printing technology includes the following steps:

[0005] Step S1: obtaining the user's automobile shell structure information data, and performing functional requirements and structural performance evaluation and analysis on the user's automobile shell structure information data to obtain automobile shell structure functional requirements data and automobile shell structure performance requirements status data;

[0006] Step S2: performing shell structure function design analysis on the automobile shell structure function requirement data to obtain a set of automobile shell structure function design parameters; performing key performance parameter statistical analysis on the automobile shell structure performance requirement status data to obtain a set of automobile shell structure performance key parameters;

[0007] Step S3: performing 3D simulation modeling analysis according to the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance to generate a 3D simulation space model of the automobile shell structure; performing 3D printing and manufacturing on the 3D simulation space model of the automobile shell structure by using 3D printing technology to obtain a 3D printed initial model of the automobile shell structure;

[0008] Step S4: Perform mechanical simulation test on the initial 3D printed model of the automobile shell structure to obtain abnormal mechanical simulation test results of the automobile shell structure; based on the abnormal mechanical simulation test results of the automobile shell structure, perform shell structure optimization design on the initial 3D printed model of the automobile shell structure to generate an optimized 3D printing result of the automobile shell structure.

[0009] The present invention first obtains information data related to the automobile shell structure by the user, including information on the size, shape, material, etc. of the automobile shell structure, so as to provide basic data for subsequent functional demand evaluation, structural usage habit mining analysis, and safety requirement identification analysis. By obtaining accurate and comprehensive shell structure information, it can be ensured that the designed automobile shell meets the needs and expectations of the user, and the overall quality and user experience of the automobile shell structure can be improved. By performing functional demand evaluation and analysis on the user's automobile shell structure information data, it is intended to understand the user's specific needs for the automobile shell function, which includes the strength, durability, waterproofness and other functional requirements of the shell. By analyzing the functional requirements, guidance can be provided to the design team to ensure that the design of the automobile shell is consistent with the user's expectations and meets its usage requirements. At the same time, by performing structural performance evaluation and analysis on the user's automobile shell structure information data, this step is intended to comprehensively consider the user's usage habits and safety requirements, and evaluate the performance status of the automobile shell structure. Through this analysis, guidance can be provided for the subsequent parameter design process, and the design of the automobile shell can be optimized to make it more in line with the user's needs and expectations, thereby improving the overall quality and safety performance of the automobile shell structure design. Secondly, by designing the structural appearance and internal characteristic function parameters of the functional demand data of the automobile shell structure, it is helpful to transform user needs into specific design parameters, which includes determining the appearance characteristic parameters such as the size, curve, and proportion of the shell, as well as the internal characteristic parameters such as structural strength, lightweight, and collision safety, so as to achieve a balance between design aesthetics and functionality. By reasonably designing the appearance function parameters and internal characteristic function parameters, the designed automobile shell structure can meet the user's needs in appearance and meet the user's needs for the comfort and practicality of the automobile interior space, thereby improving the user's satisfaction and loyalty to the automobile shell structure design. In addition, by statistically analyzing the key performance parameters of the automobile shell structure performance demand status data, it is helpful to determine the key parameters that affect the performance of the automobile shell, including the analysis and statistics of key performance indicators such as the strength, stiffness, and durability of the shell, so as to reveal potential problems and improvement space in the design. Through the statistical analysis of key performance parameters, guidance can be provided to the design team to optimize the design of the automobile shell and improve its overall performance and reliability, thereby improving the performance analysis process of the automobile shell structure. Then, by performing 3D simulation modeling and analysis on the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance, a highly accurate 3D simulation space model of the automobile shell structure can be generated. The key to this step is to achieve accurate simulation and analysis of the morphology and performance of the automobile shell structure by modeling the design space of the automobile shell structure.By using advanced 3D printing technology to 3D print the 3D simulation space model of the automobile shell structure, the 3D printed initial model of the automobile shell structure is obtained. The importance of this step lies in the ability to transform the virtual design into an actual physical model, and to simplify the design process of the automobile shell structure, thereby providing a physical basis for subsequent test verification and product development. Finally, by performing corresponding mechanical simulation tests on the 3D printed initial model of the automobile shell structure to mark the mechanical test results as normal or abnormal, this step can quickly and accurately identify the 3D printed models of the automobile shell structure with abnormal mechanical properties, thereby providing a goal and direction for further optimization. In addition, the shell structure is optimized and designed for the 3D printed initial model of the automobile shell structure based on the abnormal test results of the mechanical simulation of the automobile shell structure. This step will optimize and improve the abnormal problems to generate optimized 3D printing results, thereby improving the overall performance and reliability of the automobile shell structure.

[0010] Preferably, the present invention further provides a vehicle shell structure design system based on 3D printing technology, which is used to execute the vehicle shell structure design method based on 3D printing technology as described above. The vehicle shell structure design system based on 3D printing technology includes:

[0011] The automobile shell structure demand evaluation and analysis module is used to obtain the user's automobile shell structure information data, and perform functional demand and structural performance evaluation and analysis on the user's automobile shell structure information data, so as to obtain the automobile shell structure functional demand data and automobile shell structure performance demand status data;

[0012] The key design parameter analysis module of the automobile shell structure is used to perform shell structure function design analysis on the automobile shell structure function requirement data to obtain the automobile shell structure function design parameter set; perform performance key parameter statistical analysis on the automobile shell structure performance requirement status data to obtain the automobile shell structure performance key parameter set;

[0013] The 3D simulation printing module of the automobile shell structure is used to perform 3D simulation modeling and analysis according to the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance, so as to generate a 3D simulation space model of the automobile shell structure; the 3D simulation space model of the automobile shell structure is 3D printed and manufactured by using 3D printing technology, so as to obtain a 3D printed initial model of the automobile shell structure;

[0014] The automobile shell structure 3D model test optimization module is used to perform mechanical simulation tests on the initial 3D printed model of the automobile shell structure to obtain abnormal mechanical simulation test results of the automobile shell structure; based on the abnormal mechanical simulation test results of the automobile shell structure, the shell structure of the initial 3D printed model of the automobile shell structure is optimized to generate the 3D printing optimization results of the automobile shell structure.

[0015] In summary, the present invention provides a car shell structure design system based on 3D printing technology, which consists of a car shell structure demand assessment and analysis module, a car shell structure key design parameter analysis module, a car shell structure 3D simulation printing module and a car shell structure 3D model testing and optimization module. It can realize any car shell structure design method based on 3D printing technology described in the present invention, and is used to combine the operations between computer programs running on each module to realize a car shell structure design method based on 3D printing technology. The internal structures of the system cooperate with each other, which can greatly reduce duplication of work and manpower investment, and can also quickly and effectively provide a more accurate and efficient car shell structure design process, thereby simplifying the operation process of the car shell structure design system based on 3D printing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the steps of the automobile shell structure design method based on 3D printing technology of the present invention;

[0017] Figure 2 for Figure 1 Detailed step flow diagram of step S1;

[0018] Figure 3 for Figure 1 Detailed step flow chart of step S2 in FIG.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical method of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In addition, the accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. The functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor methods and / or microcontroller methods.

[0022] It should be understood that, although the terms "first", "second", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another unit. For example, without departing from the scope of the exemplary embodiments, the first unit may be referred to as the second unit, and similarly the second unit may be referred to as the first unit. The term "and / or" used herein includes any and all combinations of one or more of the listed associated items.

[0023] To achieve this, please refer to Figures 1 to 3 The present invention provides a method for designing a car shell structure based on 3D printing technology, the method comprising the following steps:

[0024] Step S1: obtaining the user's automobile shell structure information data, and performing functional requirements and structural performance evaluation and analysis on the user's automobile shell structure information data to obtain automobile shell structure functional requirements data and automobile shell structure performance requirements status data;

[0025] Step S2: performing shell structure function design analysis on the automobile shell structure function requirement data to obtain a set of automobile shell structure function design parameters; performing key performance parameter statistical analysis on the automobile shell structure performance requirement status data to obtain a set of automobile shell structure performance key parameters;

[0026] Step S3: performing 3D simulation modeling analysis according to the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance to generate a 3D simulation space model of the automobile shell structure; performing 3D printing and manufacturing on the 3D simulation space model of the automobile shell structure by using 3D printing technology to obtain a 3D printed initial model of the automobile shell structure;

[0027] Step S4: Perform mechanical simulation test on the initial 3D printed model of the automobile shell structure to obtain abnormal mechanical simulation test results of the automobile shell structure; based on the abnormal mechanical simulation test results of the automobile shell structure, perform shell structure optimization design on the initial 3D printed model of the automobile shell structure to generate an optimized 3D printing result of the automobile shell structure.

[0028] In the embodiment of the present invention, reference Figure 1 The above is a schematic flow chart of the steps of the automobile shell structure design method based on 3D printing technology of the present invention. In this example, the automobile shell structure design method based on 3D printing technology includes the following steps:

[0029] Step S1: obtaining the user's automobile shell structure information data, and performing functional requirements and structural performance evaluation and analysis on the user's automobile shell structure information data to obtain automobile shell structure functional requirements data and automobile shell structure performance requirements status data;

[0030] In the embodiment of the present invention, firstly, by acquiring information data related to the automobile shell structure of the user, including information on the size, shape, material, etc. of the automobile shell structure, a basic understanding of the user's needs is established, thereby obtaining the user's automobile shell structure information data. Secondly, by performing functional demand evaluation and analysis on the automobile shell structure information data provided by the user, this step involves analyzing the user's expectations and requirements for the functions of the automobile shell structure to identify various functional requirements and understand the user's specific requirements for the automobile shell function, which includes the requirements for the strength, durability, waterproofness, etc. of the shell, thereby obtaining the automobile shell structure function demand data. Then, the user's automobile shell structure information data is mined and analyzed by using data mining analysis methods to analyze and determine the user's actual usage habits of the automobile shell structure and safety requirements, such as collision safety, anti-theft performance, etc., and the automobile shell structure information data provided by the user is evaluated for structural performance by combining the user's automobile shell structure usage habits and the user's automobile shell structure safety requirements obtained by analysis. This includes evaluating the strength, stiffness, durability and other properties of the shell structure to understand the user's requirements and expectations for the vehicle shell structure performance, and comprehensively considering the user's usage habits and safety needs to evaluate the performance status of the automobile shell structure to make it more in line with the user's needs and expectations, and finally obtaining the automobile shell structure performance demand status data.

[0031] Step S2: performing shell structure function design analysis on the automobile shell structure function requirement data to obtain a set of automobile shell structure function design parameters; performing key performance parameter statistical analysis on the automobile shell structure performance requirement status data to obtain a set of automobile shell structure performance key parameters;

[0032] In the embodiment of the present invention, firstly, the requirements of the automobile shell structure function requirement data are identified and analyzed to identify the requirements of the appearance of the automobile shell structure (such as structural size, shape, streamlined design, lamp position, etc.) and the requirements of the internal characteristics (such as storage space layout, material selection, structural strength, seat adjustment mechanism, etc.), and the functional requirements of the appearance and internal characteristics obtained by the identification and analysis are extracted respectively, and the appearance and internal characteristics functional requirements of the automobile shell structure are converted into specific design parameters, which include the determination of the appearance characteristic parameters such as the size, curve, and proportion of the shell and the determination of the internal characteristic parameters such as structural strength, lightweight, and collision safety, so as to integrate them into a comprehensive functional design parameter set, and ensure that the design of the appearance and internal characteristics can be coordinated and unified, so as to obtain the automobile shell structure function design parameter set. Then, according to the performance requirement status data of the automobile shell structure obtained by the analysis, the performance index parameters such as strength, stiffness, and durability of the automobile shell structure are analyzed and counted, so as to determine the performance index parameters that need to be focused on and optimized in the design of the automobile shell structure, and evaluate the importance of the corresponding performance index parameters, and at the same time, the automobile shell structure performance parameters with a relatively large performance parameter importance are selected as key parameters, and finally the automobile shell structure performance key parameter set is obtained.

[0033] Step S3: performing 3D simulation modeling analysis according to the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance to generate a 3D simulation space model of the automobile shell structure; performing 3D printing and manufacturing on the 3D simulation space model of the automobile shell structure by using 3D printing technology to obtain a 3D printed initial model of the automobile shell structure;

[0034] In the embodiment of the present invention, the functional design parameter set and the key performance parameter set of the automobile shell structure are first mapped and analyzed by using the topological mapping technology to map the relationship between the functional design parameters and the key performance parameters in the design space, and the functional design parameters and the key performance parameters are integrated and mapped to establish a comprehensive design parameter space to obtain the topological mapping space of the design parameters of the automobile shell structure, and the design parameter topological mapping space is subjected to 3D simulation modeling analysis by using the 3D simulation modeling method. This step is modeled according to the corner point features of the design space to achieve accurate simulation and analysis of the morphology and performance of the automobile shell structure, thereby generating a 3D simulation space model of the automobile shell structure. Finally, the 3D simulation space model of the automobile shell structure is printed and manufactured by using the 3D printing technology to convert the 3D model into a physical structure, thereby obtaining a 3D printed initial model of the automobile shell structure for subsequent testing and verification.

[0035] Step S4: Perform mechanical simulation test on the initial 3D printed model of the automobile shell structure to obtain abnormal mechanical simulation test results of the automobile shell structure; based on the abnormal mechanical simulation test results of the automobile shell structure, perform shell structure optimization design on the initial 3D printed model of the automobile shell structure to generate an optimized 3D printing result of the automobile shell structure.

[0036] In the embodiment of the present invention, firstly, a suitable mechanical simulation test score calculation formula is constructed to perform a simulation test score calculation on the 3D printed initial model of the automobile shell structure, so as to perform compression, bending and impact tests on the 3D printed initial model of the automobile shell structure generated by 3D printing, and obtain the corresponding test score value according to the corresponding test results, thereby obtaining the compression, bending and impact test scores of the 3D model of the automobile shell structure. Secondly, by assigning test weights for various test scores, the importance of different test items in the overall evaluation is determined, thereby obtaining the test weights corresponding to the 3D model of the automobile shell structure, and then, by accumulating and summing the scores of each test of the 3D model of the automobile shell structure multiplied by the weights according to the test weights assigned in the previous step, the results of the compression, bending and impact tests are comprehensively considered, thereby obtaining the comprehensive score value of the mechanical test of the 3D model of the automobile shell structure. Next, the comprehensive score is compared and judged according to the preset mechanical test scoring standard threshold. If the comprehensive score meets or exceeds the preset standard threshold, the mechanical simulation test result of the corresponding initial model of the 3D printed car shell structure is marked as normal; otherwise, it is marked as abnormal. At the same time, the abnormal results are screened out to obtain the abnormal test results of the mechanical simulation of the car shell structure. Finally, the shell structure is optimized for the corresponding initial model of the 3D printed car shell structure with abnormalities based on the abnormal test results of the mechanical simulation of the car shell structure. This step involves analyzing and improving the problems involved in the abnormal test results to generate optimized 3D printing results of the car shell structure to ensure that it meets the design requirements and standards.

[0037] The present invention first obtains information data related to the automobile shell structure by the user, including information on the size, shape, material, etc. of the automobile shell structure, so as to provide basic data for subsequent functional demand evaluation, structural usage habit mining analysis, and safety requirement identification analysis. By obtaining accurate and comprehensive shell structure information, it can be ensured that the designed automobile shell meets the needs and expectations of the user, and the overall quality and user experience of the automobile shell structure can be improved. By performing functional demand evaluation and analysis on the user's automobile shell structure information data, it is intended to understand the user's specific needs for the automobile shell function, which includes the strength, durability, waterproofness and other functional requirements of the shell. By analyzing the functional requirements, guidance can be provided to the design team to ensure that the design of the automobile shell is consistent with the user's expectations and meets its usage requirements. At the same time, by performing structural performance evaluation and analysis on the user's automobile shell structure information data, this step is intended to comprehensively consider the user's usage habits and safety requirements, and evaluate the performance status of the automobile shell structure. Through this analysis, guidance can be provided for the subsequent parameter design process, and the design of the automobile shell can be optimized to make it more in line with the user's needs and expectations, thereby improving the overall quality and safety performance of the automobile shell structure design. Secondly, by designing the structural appearance and internal characteristic function parameters of the functional demand data of the automobile shell structure, it is helpful to transform user needs into specific design parameters, which includes determining the appearance characteristic parameters such as the size, curve, and proportion of the shell, as well as the internal characteristic parameters such as structural strength, lightweight, and collision safety, so as to achieve a balance between design aesthetics and functionality. By reasonably designing the appearance function parameters and internal characteristic function parameters, the designed automobile shell structure can meet the user's needs in appearance and meet the user's needs for the comfort and practicality of the automobile interior space, thereby improving the user's satisfaction and loyalty to the automobile shell structure design. In addition, by statistically analyzing the key performance parameters of the automobile shell structure performance demand status data, it is helpful to determine the key parameters that affect the performance of the automobile shell, including the analysis and statistics of key performance indicators such as the strength, stiffness, and durability of the shell, so as to reveal potential problems and improvement space in the design. Through the statistical analysis of key performance parameters, guidance can be provided to the design team to optimize the design of the automobile shell and improve its overall performance and reliability, thereby improving the performance analysis process of the automobile shell structure. Then, by performing 3D simulation modeling and analysis on the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance, a highly accurate 3D simulation space model of the automobile shell structure can be generated. The key to this step is to achieve accurate simulation and analysis of the morphology and performance of the automobile shell structure by modeling the design space of the automobile shell structure.By using advanced 3D printing technology to 3D print the 3D simulation space model of the automobile shell structure, the 3D printed initial model of the automobile shell structure is obtained. The importance of this step lies in the ability to transform the virtual design into an actual physical model, and to simplify the design process of the automobile shell structure, thereby providing a physical basis for subsequent test verification and product development. Finally, by performing corresponding mechanical simulation tests on the 3D printed initial model of the automobile shell structure to mark the mechanical test results as normal or abnormal, this step can quickly and accurately identify the 3D printed models of the automobile shell structure with abnormal mechanical properties, thereby providing a goal and direction for further optimization. In addition, the shell structure is optimized and designed for the 3D printed initial model of the automobile shell structure based on the abnormal test results of the mechanical simulation of the automobile shell structure. This step will optimize and improve the abnormal problems to generate optimized 3D printing results, thereby improving the overall performance and reliability of the automobile shell structure.

[0038] Preferably, step S1 comprises the following steps:

[0039] Step S11: Acquire the user's car shell structure information data;

[0040] Step S12: Performing functional requirement evaluation and analysis on the user's automobile shell structure information data to obtain automobile shell structure functional requirement data;

[0041] Step S13: performing structure usage habit mining analysis on the user's car shell structure information data to obtain the user's car shell structure usage habit information data;

[0042] Step S14: performing safety requirement identification analysis on the user's automobile shell structure information data to obtain the user's automobile shell structure safety requirement information data;

[0043] Step S15: Based on the user's automobile shell structure usage habit information data and the user's automobile shell structure safety requirement information data, a structural performance evaluation and analysis is performed on the user's automobile shell structure information data to obtain automobile shell structure performance requirement status data.

[0044] As an embodiment of the present invention, refer to Figure 2 As shown, Figure 1 Detailed step flow diagram of step S1 in FIG. 1 , in this embodiment, step S1 includes the following steps:

[0045] Step S11: Acquire the user's car shell structure information data;

[0046] The embodiment of the present invention obtains information data related to the automobile shell structure from the user, including information on the size, shape, material, etc. of the automobile shell structure, so as to establish a basic understanding of the user's needs and finally obtain the user's automobile shell structure information data.

[0047] Step S12: Performing functional requirement evaluation and analysis on the user's automobile shell structure information data to obtain automobile shell structure functional requirement data;

[0048] The embodiment of the present invention performs functional demand assessment and analysis on the automobile shell structure information data provided by the user. This step involves analyzing the user's expectations and requirements for the automobile shell structure functions to identify various functional requirements and understand the user's specific requirements for the automobile shell functions, which include requirements for the shell's strength, durability, waterproofness and other functional aspects, and ultimately obtains the automobile shell structure function requirement data.

[0049] Step S13: performing structure usage habit mining analysis on the user's car shell structure information data to obtain the user's car shell structure usage habit information data;

[0050] The embodiment of the present invention mines and analyzes the user's automobile shell structure usage habits in the user's automobile shell structure information data by using a data mining and analysis method, so as to analyze the user's driving habits, riding habits and usage habits of the vehicle shell structure, understand the user's actual usage of the vehicle structure, and determine which parts of the automobile shell structure need to be reinforced, and finally obtain the user's automobile shell structure usage habit information data.

[0051] Step S14: performing safety requirement identification analysis on the user's automobile shell structure information data to obtain the user's automobile shell structure safety requirement information data;

[0052] The embodiment of the present invention performs safety requirement identification and analysis on the automobile shell structure information data provided by the user. This step is intended to identify the user's requirements for the safety of the vehicle shell structure, such as collision safety, anti-theft performance, etc. By identifying the user's safety requirements, it can be ensured that the designed shell structure meets safety standards, thereby improving the overall safety of the automobile shell structure design, and ultimately obtaining the user's automobile shell structure safety requirement information data.

[0053] Step S15: Based on the user's automobile shell structure usage habit information data and the user's automobile shell structure safety requirement information data, a structural performance evaluation and analysis is performed on the user's automobile shell structure information data to obtain automobile shell structure performance requirement status data.

[0054] The embodiment of the present invention performs a structural performance evaluation and analysis on the automobile shell structure information data provided by the user by combining the analyzed user's automobile shell structure usage habit information data and the user's automobile shell structure safety requirement information data, which includes evaluating the strength, stiffness, durability and other properties of the shell structure to understand the user's requirements and expectations for the vehicle shell structure performance, and comprehensively considers the user's usage habits and safety requirements to evaluate the performance status of the automobile shell structure, so that it better meets the user's needs and expectations, and finally obtains the automobile shell structure performance requirement status data.

[0055] The present invention first obtains information data related to the automobile shell structure by the user, including information on the size, shape, material, etc. of the automobile shell structure, so as to provide basic data for subsequent functional demand evaluation, structural use habit mining analysis, and safety requirement identification analysis. By obtaining accurate and comprehensive shell structure information, it can ensure that the designed automobile shell meets the needs and expectations of the user, and improve the overall quality and user experience of the automobile shell structure. Secondly, by performing functional demand evaluation and analysis on the user's automobile shell structure information data, it is intended to understand the user's specific needs for the automobile shell function, which includes the strength, durability, waterproofness and other functional requirements of the shell. By analyzing the functional requirements, guidance can be provided to the design team to ensure that the design of the automobile shell is consistent with the user's expectations and meets its use requirements. Then, by performing structural use habit mining and analysis on the user's automobile shell structure information data, it is intended to understand the user's actual use habits of the automobile shell structure. By analyzing the user's use habits, it can provide valuable references for the design team to guide the design and optimization of the shell structure. For example, by understanding the user's habits, it can be determined which parts of the shell need to be reinforced to improve its durability and safety. Next, by performing safety requirement identification and analysis on the user's car shell structure information data, this includes understanding the user's requirements for the safety of the car shell, such as collision safety, anti-theft performance, etc. By identifying safety requirements, safety considerations can be incorporated into the design of the car shell, thereby improving the overall safety performance of the subsequent car shell structure design. Finally, by performing structural performance evaluation and analysis on the user's car shell structure information data based on the user's car shell structure usage habit information data and the user's car shell structure safety requirement information data, this step aims to comprehensively consider the user's usage habits and safety needs, and evaluate the performance status of the car shell structure. Through this analysis, it can provide guidance for the subsequent parameter design process, optimize the design of the car shell, and make it more in line with the user's needs and expectations, thereby improving the overall quality and safety performance of the car shell structure design.

[0056] Preferably, step S2 comprises the following steps:

[0057] Step S21: extracting the appearance and internal characteristic function requirements of the automobile shell structure function requirement data to obtain the appearance function requirement data of the automobile shell structure and the internal characteristic function requirement data of the automobile shell structure;

[0058] Step S22: designing the structural appearance function parameters according to the automobile shell structural appearance function requirement data to obtain the automobile shell structural appearance function design parameter set;

[0059] Step S23: designing the internal characteristic function parameters of the structure according to the internal characteristic function requirement data of the automobile shell structure, and obtaining the internal characteristic function design parameter set of the automobile shell structure;

[0060] Step S24: merging the automobile shell structure appearance function design parameter set and the automobile shell structure internal characteristic function design parameter set to obtain the automobile shell structure function design parameter set;

[0061] Step S25: Performing statistical analysis on key performance parameters of the automobile shell structure performance requirement status data to obtain a set of key performance parameters of the automobile shell structure.

[0062] As an embodiment of the present invention, refer to Figure 3 As shown, Figure 1 Detailed step flow diagram of step S2 in FIG. 1 , in this embodiment, step S2 includes the following steps:

[0063] Step S21: extracting the appearance and internal characteristic function requirements of the automobile shell structure function requirement data to obtain the appearance function requirement data of the automobile shell structure and the internal characteristic function requirement data of the automobile shell structure;

[0064] The embodiment of the present invention identifies and analyzes the requirements of the automobile shell structure function requirements data to identify the requirements of the automobile shell structure appearance (such as structural size, shape, streamlined design, headlight position, etc.) and internal characteristics (such as storage space layout, material selection, structural strength, seat adjustment mechanism, etc.), and respectively extracts the functional requirements of the appearance and internal characteristics obtained by the identification and analysis, and finally obtains the automobile shell structure appearance functional requirement data and the automobile shell structure internal characteristics functional requirement data.

[0065] Step S22: designing the structural appearance function parameters according to the automobile shell structural appearance function requirement data to obtain the automobile shell structural appearance function design parameter set;

[0066] The embodiment of the present invention converts the user's appearance function requirements into specific design parameters by planning and defining the appearance design elements accordingly according to the extracted automobile shell structure appearance function requirement data, which includes determining the appearance feature parameters such as the size, curve, and proportion of the shell to achieve a balance between design aesthetics and functionality, and finally obtain a set of automobile shell structure appearance function design parameters.

[0067] Step S23: designing the internal characteristic function parameters of the structure according to the internal characteristic function requirement data of the automobile shell structure, and obtaining the internal characteristic function design parameter set of the automobile shell structure;

[0068] The embodiment of the present invention plans and defines the internal characteristic function design elements of the automobile structure according to the extracted internal characteristic function requirement data of the automobile shell structure, so as to optimize the internal space layout and functional configuration of the automobile shell, which involves the determination of internal characteristic parameters such as structural strength, lightweight, and collision safety, and meets the user's requirements for the comfort and practicality of the automobile interior space, and finally obtains the internal characteristic function design parameter set of the automobile shell structure.

[0069] Step S24: merging the automobile shell structure appearance function design parameter set and the automobile shell structure internal characteristic function design parameter set to obtain the automobile shell structure function design parameter set;

[0070] The embodiment of the present invention combines the previously designed and generated automobile shell structure appearance function design parameter set and the automobile shell structure internal characteristic function design parameter set into a comprehensive function design parameter set to ensure that the design of the appearance and internal characteristics can be coordinated and unified, and finally obtain the automobile shell structure function design parameter set.

[0071] Step S25: Performing statistical analysis on key performance parameters of the automobile shell structure performance requirement status data to obtain a set of key performance parameters of the automobile shell structure.

[0072] The embodiment of the present invention analyzes and counts the performance index parameters such as strength, stiffness, durability, etc. of the automobile shell structure according to the performance demand status data of the automobile shell structure obtained by analysis, so as to determine the performance index parameters that need to be focused on and optimized in the design of the automobile shell structure, and evaluates the importance of the corresponding performance index parameters. At the same time, the performance parameters of the automobile shell structure with greater importance are screened out as key parameters, and finally a set of key parameters of the automobile shell structure performance is obtained.

[0073] The present invention firstly extracts and processes the appearance and internal characteristic function requirements of the automobile shell structure function requirement data, which helps to deeply understand the user's requirements for the automobile shell. By extracting the appearance function requirements, the appearance characteristics of the shell, such as structural size, shape, streamlined design, headlight position, etc., can be determined to ensure that the automobile appearance meets the aesthetic and brand positioning requirements; and by extracting the internal characteristic function requirements, the functional characteristics inside the shell, such as storage space layout, seat adjustment mechanism, etc., can be determined to meet the user's practicality and comfort requirements for the internal space. Secondly, by designing the structural appearance function parameters according to the automobile shell structure appearance function requirement data, it is helpful to convert user needs into specific design parameters, which includes determining the appearance characteristic parameters such as the size, curve, proportion, etc. of the shell to achieve a balance between design aesthetics and functionality. By reasonably designing the appearance function parameters, the designed automobile shell structure can meet the user's needs in appearance. Then, the internal characteristic function parameters of the structure are designed according to the internal characteristic function requirement data of the automobile shell structure, aiming to optimize the internal space layout and functional configuration of the automobile shell. This involves the determination of internal characteristic parameters such as structural strength, lightweight, and collision safety to meet the user's comfort and practicality requirements for the interior space of the automobile. By reasonably designing the internal characteristic function parameters, the riding experience can be improved, thereby improving the user's satisfaction and loyalty to the automobile shell structure design. Next, by merging the parameters of the automobile shell structure appearance function design parameter set and the automobile shell structure internal characteristic function design parameter set, a complete automobile shell structure function design parameter set is obtained. The key to this step is to integrate the design parameters of the appearance and internal characteristics to achieve the consistency and coordination of the overall design. Through parameter merging, it can be ensured that the automobile shell meets the requirements of the overall design in terms of appearance and internal functions, and improve the overall quality and competitiveness of the automobile shell structure design. Finally, by statistically analyzing the key performance parameters of the automobile shell structure performance requirement status data, it is helpful to determine the key parameters that affect the performance of the automobile shell, including the analysis and statistics of key performance indicators such as the strength, stiffness, and durability of the shell, so as to reveal potential problems and room for improvement in the design. Through statistical analysis of key performance parameters, guidance can be provided to the design team to optimize the design of the vehicle shell and improve its overall performance and reliability.

[0074] Preferably, step S25 comprises the following steps:

[0075] Step S251: Designing structural performance parameters for the automobile shell structural performance requirement data to obtain an initial parameter set of the automobile shell structural performance;

[0076] Step S252: performing performance dimension evaluation and analysis on the automobile shell structure performance demand status data to obtain automobile shell structure performance dimension data; performing dimension classification processing on the automobile shell structure performance initial parameter set based on the automobile shell structure performance dimension data to obtain automobile shell structure performance parameter sets under different performance dimensions;

[0077] Step S253: performing correlation evaluation analysis on the performance parameter sets of the automobile shell structure under different performance dimensions to obtain correlation relationship data between the performance parameters of the automobile shell structure under different performance dimensions; performing correlation influence exploration analysis on the performance parameter sets of the automobile shell structure under different performance dimensions based on the correlation relationship data between the performance parameters of the automobile shell structure under different performance dimensions to obtain correlation influence factors between the performance parameters of the automobile shell structure under different performance dimensions;

[0078] Step S254: performing association weight allocation processing on the automobile shell structure performance parameter sets under different performance dimensions based on the association relationship data between the automobile shell structure performance parameters under different performance dimensions, and obtaining the automobile shell structure performance association weight coefficients under different performance dimensions; performing importance evaluation and analysis on the automobile shell structure performance parameter sets under different performance dimensions according to the automobile shell structure performance association weight coefficients under different performance dimensions and the association influencing factors between the automobile shell structure performance parameters under different performance dimensions, and obtaining the importance of the automobile shell structure performance parameters under different performance dimensions;

[0079] Step S255: performing key parameter screening processing on the automobile shell structure performance parameter sets under different performance dimensions according to the importance of the automobile shell structure performance parameters under different performance dimensions, and obtaining the automobile shell structure performance key parameter set.

[0080] In the embodiment of the present invention, firstly, the structural performance parameter design is performed for the performance requirement status data of the automobile shell structure. This step involves analyzing the performance requirements of the automobile shell structure under various conditions, including safety, stability, durability, etc., to determine the initial performance parameter set, thereby converting the user requirements into specific design parameters, and ensuring that the automobile shell structure can meet the basic requirements in terms of performance. Secondly, the performance dimension of the corresponding automobile shell structure performance requirement is analyzed and obtained by evaluating and analyzing the performance dimension of the automobile shell structure performance requirement, and the corresponding automobile shell structure performance parameters are classified and processed according to different dimensions based on the analyzed automobile shell structure performance dimension data, so as to better understand the various performance requirements, and obtain the performance parameter sets under different performance dimensions on this basis. Then, the performance parameter sets under different performance dimensions are evaluated and analyzed by using a correlation evaluation analysis method (such as cosine similarity, etc.). This step aims to analyze the correlation relationship between different performance parameters, and use the correlation impact evaluation algorithm to explore the correlation impact factors between them in combination with the correlation relationship between different performance parameters obtained by the analysis, so as to better understand the interaction and influence between each performance parameter, thereby obtaining the correlation impact factors between the performance parameters of the automobile shell structure under different performance dimensions. Next, after analyzing the correlation between the performance parameters, the correlation relationship data between the performance parameters of the automobile shell structure under different performance dimensions obtained by the analysis are combined to perform correlation weight allocation processing, so as to allocate correlation weight coefficients to the corresponding performance parameters according to the correlation relationship data under different performance dimensions. At the same time, the importance of the performance parameters is evaluated and analyzed by combining the assigned correlation weight coefficients and the correlation influencing factors to determine the importance of the performance parameters under different performance dimensions. Finally, the importance of the obtained performance parameters is compared and judged according to the preset importance threshold, so as to select the automobile shell structure performance parameters corresponding to the performance parameter importance greater than or equal to the preset importance threshold as key parameters, thereby selecting a complete set of performance key parameters, which are crucial to ensuring the overall performance of the automobile shell structure, so as to make more accurate adjustments and controls in the subsequent design and optimization process.

[0081] The present invention firstly designs the structural performance parameters of the automobile shell structure performance demand data, and can determine the initial automobile shell structure performance parameter set. The key of this step is that the user demand can be converted into specific design parameters, which involves the material selection, thickness design, structural layout and other aspects of the shell, so as to ensure that the shell can meet the basic requirements in terms of performance. Secondly, by performing performance dimension evaluation and analysis on the automobile shell structure performance demand data, and based on the automobile shell structure performance dimension data obtained by the analysis, the automobile shell structure performance initial parameter set is dimensionally classified and processed, so as to obtain the automobile shell structure performance parameter set under different performance dimensions. The key of this step is that the complex performance demand data can be classified and sorted, so as to perform more detailed analysis and design on the parameters under different performance dimensions in the future. Then, by performing correlation evaluation and analysis on the automobile shell structure performance parameter set under different performance dimensions, the correlation relationship between different parameters can be revealed, so as to provide guidance for subsequent design and optimization. Further, by performing correlation influence exploration and analysis on the automobile shell structure performance parameter set under different performance dimensions based on the correlation relationship data between the automobile shell structure performance parameters under different performance dimensions, it is helpful to determine the correlation influence factors under different performance dimensions, and then better understand the mutual influence relationship between the parameters. Next, by performing correlation weight distribution processing on the automobile shell structure performance parameter sets under different performance dimensions based on the correlation relationship data between the automobile shell structure performance parameters under different performance dimensions, the correlation degree between different parameters can be quantified. At the same time, by performing importance evaluation analysis on the automobile shell structure performance parameter sets under different performance dimensions according to the automobile shell structure performance correlation weight coefficients under different performance dimensions and the correlation influencing factors between the automobile shell structure performance parameters under different performance dimensions, the importance of each automobile shell structure performance parameter is determined, thereby providing a basis for subsequent parameter optimization and screening. Finally, by performing key parameter screening processing on the automobile shell structure performance parameter sets under different performance dimensions according to the importance of the automobile shell structure performance parameters under different performance dimensions, the key parameter set of automobile shell structure performance is obtained. The purpose of this step is to screen out the key parameters that have the greatest impact on the overall performance from the complex parameter set, so as to adjust and control more accurately during the design and optimization process.

[0082] Preferably, step S3 comprises the following steps:

[0083] Step S31: performing a structural topological mapping analysis on a set of functional design parameters of an automobile shell structure and a set of key parameters of performance of an automobile shell structure to obtain a topological mapping space of design parameters of an automobile shell structure;

[0084] Step S32: performing spatial feature analysis on the topological mapping space of the automobile shell structure design parameters to obtain the topological spatial feature data of the automobile shell structure design;

[0085] Step S33: performing structural layer thickness corner point and structural distribution corner point detection on the topological space feature data of the automobile shell structure design to obtain the structural layer thickness corner point feature data of the automobile shell structure and the structural distribution corner point feature data of the automobile shell structure;

[0086] Step S34: performing 3D simulation modeling analysis on the topological mapping space of the design parameters of the automobile shell structure according to the thickness corner point feature data of the automobile shell structure and the distribution corner point feature data of the automobile shell structure to generate a 3D simulation space model of the automobile shell structure;

[0087] Step S35: 3D printing is performed on the 3D simulation space model of the automobile shell structure by using 3D printing technology to obtain an initial 3D printed model of the automobile shell structure.

[0088] In the embodiment of the present invention, the functional design parameter set and the key performance parameter set of the automobile shell structure are first mapped and analyzed by using the topological mapping technology to map the relationship between the functional design parameters and the key performance parameters in the design space, and the functional design parameters and the key performance parameters are integrated and mapped to establish a comprehensive design parameter space to obtain the topological mapping space of the automobile shell structure design parameters, and ensure the matching of the design parameters with the functional requirements and performance indicators. Secondly, the spatial feature analysis method is used to perform spatial feature analysis on the topological mapping space of the automobile shell structure design parameters, which includes analyzing and extracting the structural features of the topological mapping space to obtain the feature data of the topological space of the automobile shell structure design, so as to deeply understand the structural characteristics and features of the design space. Then, the structural layer thickness corner point and structural distribution corner point detection are performed on the feature data of the topological space of the automobile shell structure design by using the 3D corner point detection algorithm. This step is intended to identify and extract the feature data of the layer thickness corner point and the distribution corner point in the design space, so as to obtain the feature data of the layer thickness corner point of the automobile shell structure and the feature data of the distribution corner point of the automobile shell structure. Next, the 3D simulation modeling method is used to perform 3D simulation modeling and analysis on the design parameter topological mapping space according to the corner feature data of the layer thickness of the automobile shell structure and the corner feature data of the structure distribution. This step is to achieve accurate simulation and analysis of the morphology and performance of the automobile shell structure by modeling according to the corner feature of the design space, thereby generating a 3D simulation space model of the automobile shell structure. Finally, the 3D simulation space model of the automobile shell structure is manufactured by using 3D printing technology to convert the 3D model into a physical structure, thereby obtaining a 3D printed initial model of the automobile shell structure for subsequent testing and verification.

[0089] The present invention firstly performs structural topological mapping analysis on the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance, and can map out their mutual relationship in the design space, thereby forming a topological mapping space of the automobile shell structure design parameters. The key to this step is that the functional design parameters and the key performance parameters can be integrated and mapped to establish a comprehensive design parameter space, which lays the foundation for subsequent design work. Secondly, by performing spatial feature analysis on the topological mapping space of the automobile shell structure design parameters, the spatial distribution characteristics between the parameters can be deeply understood, including dense areas, sparse areas and possible key nodes, etc. The purpose of this step is to analyze the characteristics of the design space and provide a basis and direction for subsequent design optimization. Then, by performing structural layer thickness corner point and structural distribution corner point detection on the topological space feature data of the automobile shell structure design, it is intended to identify the characteristics of the layer thickness corner point and the distribution corner point in the design space. The detection of these corner points helps to determine the key feature points in the design and provide basic data for subsequent modeling and simulation analysis. Next, by performing 3D simulation modeling and analysis on the topological mapping space of the design parameters of the automobile shell structure according to the corner feature data of the layer thickness of the automobile shell structure and the corner feature data of the distribution of the automobile shell structure, a highly accurate 3D simulation space model of the automobile shell structure can be generated. The key to this step is to achieve accurate simulation and analysis of the morphology and performance of the automobile shell structure by modeling the corner features of the design space. Finally, by using advanced 3D printing technology to 3D print the 3D simulation space model of the automobile shell structure, a 3D printed initial model of the automobile shell structure is obtained. The importance of this step lies in the ability to transform the virtual design into an actual physical model, thereby providing a physical basis for subsequent test verification and product development.

[0090] Preferably, step S35 includes the following steps:

[0091] Step S351: using 3D printing technology to perform fused deposition printing modeling on the 3D simulation space model of the automobile shell structure to obtain a 3D fused printing model of the automobile shell structure;

[0092] Step S352: performing polishing and curing processing on the 3D melt-printed model of the automobile shell structure to obtain a 3D printed, polished and cured model of the automobile shell structure;

[0093] Step S353: assembling and painting the 3D printed, polished and cured model of the automobile shell structure to obtain an initial 3D printed model of the automobile shell structure.

[0094] In an embodiment of the present invention, first, the 3D simulation space model of the automobile shell structure is subjected to melt deposition printing modeling by using 3D printing technology. This step involves converting the digital automobile shell structure design into a solid model, and using 3D melt deposition technology to print the model layer by layer into a solid structure by stacking materials layer by layer, thereby obtaining a 3D melt printed model of the automobile shell structure. Then, the 3D melt printed model of the automobile shell structure is polished and solidified. In this step, the printed model is surface treated by processes such as polishing and curing to eliminate the existing rough or incomplete surface, while improving its surface smoothness and overall quality, thereby obtaining a 3D printed polished and solidified model of the automobile shell structure. Finally, the 3D printed polished and solidified model of the automobile shell structure is assembled and painted. This step includes assembling the various components of the automobile shell structure model and painting them at the same time, so that it has a better appearance and surface texture, and ensures the integrity and stability of the overall structure, and realizes the conversion of the 3D printed model into a final usable product model, and finally forms a complete 3D printed initial model of the automobile shell structure.

[0095] The present invention firstly performs melt deposition printing modeling on the 3D simulation space model of the automobile shell structure by using advanced 3D printing technology, which can realize the physicalization of the 3D simulation space model of the automobile shell structure, and by stacking the molten material layer by layer, the virtual design can be converted into a model with a solid form. This step can not only quickly and accurately manufacture complex structures, but also take into account the details and complexity of the design during the manufacturing process, thereby providing basic data guarantee for subsequent processing and treatment. Then, by polishing and curing the 3D melt-printed model of the automobile shell structure, the surface quality and accuracy of the model can be improved, making it smoother and more consistent. Through polishing and curing treatment, the cascading effect and surface roughness generated during the printing process can be effectively eliminated, making the model smoother and more delicate, thereby providing a better foundation for subsequent assembly and painting. Finally, the 3D printed, polished and cured model of the automobile shell structure is assembled and painted. This step can achieve the final perfection and assembly of the model. Through assembly and painting, the various components can be assembled to form a complete automobile shell structure. At the same time, the appearance can be beautified and protected, and the overall texture and taste of the product can be improved. The key to this step is to be able to convert the 3D printed model into a final usable product model, thereby providing a reliable foundation for the practical application of the automobile shell structure.

[0096] Preferably, step S4 comprises the following steps:

[0097] Step S41: using a mechanical simulation test score calculation formula to perform simulation test score calculation on the 3D printed initial model of the automobile shell structure, so as to obtain a compression test score of the 3D model of the automobile shell structure, a bending test score of the 3D model of the automobile shell structure, and an impact test score of the 3D model of the automobile shell structure;

[0098] Step S42: performing test weight allocation processing on the compression test score of the 3D model of the automobile shell structure, the bending test score of the 3D model of the automobile shell structure, and the impact test score of the 3D model of the automobile shell structure, so as to obtain the compression test weight of the 3D model of the automobile shell structure, the bending test weight of the 3D model of the automobile shell structure, and the impact test weight of the 3D model of the automobile shell structure;

[0099] Step S43: performing a comprehensive evaluation and analysis on the compression test score of the 3D model of the automobile shell structure, the bending test score of the 3D model of the automobile shell structure, and the impact test score of the 3D model of the automobile shell structure according to the compression test weight of the 3D model of the automobile shell structure, the bending test weight of the 3D model of the automobile shell structure, and the impact test weight of the 3D model of the automobile shell structure, to obtain a comprehensive score value of the mechanical test of the 3D model of the automobile shell structure;

[0100] Step S44: comparing and judging the comprehensive mechanical test score of the 3D model of the automobile shell structure according to the preset mechanical test score standard threshold, when the comprehensive mechanical test score of the 3D model of the automobile shell structure is greater than or equal to the preset mechanical test score standard threshold, the mechanical simulation test result of the 3D model of the automobile shell structure corresponding to the comprehensive mechanical test score of the 3D model of the automobile shell structure is marked as normal; when the comprehensive mechanical test score of the 3D model of the automobile shell structure is less than the preset mechanical test score standard threshold, the mechanical simulation test result of the 3D model of the automobile shell structure corresponding to the comprehensive mechanical test score of the 3D model of the automobile shell structure is marked as abnormal; the mechanical simulation test results of the 3D initial model of the automobile shell structure that are marked as abnormal are screened out to obtain abnormal mechanical simulation test results of the automobile shell structure;

[0101] Step S45: Based on the abnormal test results of the mechanical simulation of the automobile shell structure, the shell structure of the automobile shell structure 3D printing initial model is optimized to generate the automobile shell structure 3D printing optimization results.

[0102] In the embodiment of the present invention, firstly, a suitable mechanical simulation test score calculation formula is formed by combining volume range parameters, coordinate parameters, compressive stress components, shear stress components, material density parameters, shell structure length, section inertia moment, force applied cross-section width, force applied cross-section height, coordinate components, bending moment, force applied concentrated load, time range parameters, integral time variable parameters, impact force, maximum allowable impact force, model impact absorption energy, maximum allowable absorption energy, impact test time attenuation parameters, correction coefficients and related parameters to perform simulation test score calculation on the 3D printed initial model of the automobile shell structure, so as to perform compression, bending and impact tests on the 3D printed initial model of the automobile shell structure generated by 3D printing, and obtain corresponding test score values ​​according to the corresponding test results, thereby obtaining the compression, bending and impact test scores of the 3D model of the automobile shell structure. Secondly, by distributing the test weights for various test scores, the importance of different test items in the overall evaluation is determined, and the influence of each test result in the comprehensive evaluation is relatively balanced, so that the corresponding performance tests of the automobile shell structure can be more accurately and reasonably weighted, thereby obtaining the compression test weight of the 3D model of the automobile shell structure, the bending test weight of the 3D model of the automobile shell structure, and the impact test weight of the 3D model of the automobile shell structure. Then, the scores of each test of the 3D model of the automobile shell structure are cumulatively summed by multiplying the scores by the weights according to the weights allocated in the previous step, so as to comprehensively consider the results of the compression, bending and impact tests, thereby obtaining the comprehensive score value of the mechanical test of the 3D model of the automobile shell structure. Next, the comprehensive score value is compared and judged according to the preset mechanical test score standard threshold. If the comprehensive score value meets or exceeds the preset standard threshold, the mechanical simulation test result of the corresponding 3D printed initial model of the automobile shell structure is marked as normal; otherwise, it is marked as abnormal. At the same time, by screening out the abnormal results, the abnormal test results of the mechanical simulation of the automobile shell structure are formed. Finally, the shell structure is optimized by 3D printing the initial model of the corresponding abnormal automobile shell structure based on the abnormal test results of the automobile shell structure mechanics simulation. This step involves analyzing and improving the problems involved in the abnormal test results to generate an optimized automobile shell structure 3D printing result to ensure that it meets the design requirements and standards.

[0103] The present invention firstly performs simulation test scoring calculation on the initial 3D printed model of the automobile shell structure by using the corresponding mechanical simulation test scoring calculation formula, and can obtain key compression, bending and impact test scores. This step can provide an important data basis for subsequent analysis and evaluation, thereby helping to evaluate the performance of the model under different mechanical conditions, so as to further determine the optimization direction and needs. Secondly, by performing test weight distribution processing on the compression test score of the 3D model of the automobile shell structure, the bending test score of the 3D model of the automobile shell structure, and the impact test score of the 3D model of the automobile shell structure, the importance of each test indicator can be more accurately measured. Through reasonable weight distribution, it can ensure that the influence of each test result in the comprehensive evaluation is relatively balanced, thereby more accurately reflecting the overall performance of the automobile shell structure. Then, the corresponding compression test score, bending test score and impact test score of the 3D model of the automobile shell structure are tested and analyzed according to the assigned compression test weight, bending test weight and impact test weight of the 3D model of the automobile shell structure, so as to obtain the comprehensive mechanical test score of the 3D model of the automobile shell structure. This step can comprehensively consider the test results and give a comprehensive evaluation value, thereby providing an important reference for subsequent judgment and decision-making. Next, by comparing and judging the comprehensive score according to the preset mechanical test score standard threshold, the mechanical test results are marked as normal or abnormal. This step can quickly and accurately identify the 3D printed model of the automobile shell structure with abnormal mechanical properties, thereby providing a goal and direction for further optimization. Finally, the shell structure of the initial model of the 3D printed automobile shell structure is optimized based on the abnormal test results of the mechanical simulation of the automobile shell structure. This step will optimize and improve the abnormal problems to generate optimized 3D printing results, thereby improving the overall performance and reliability of the automobile shell structure.

[0104] Preferably, the mechanical simulation test score calculation formula in step S41 is specifically:

[0105] ;

[0106] ;

[0107] ;

[0108] ;

[0109] ;

[0110] In the formula, Scoring the compression test of the 3D model of the car shell structure, The volume range parameters of the initial model of the 3D printed car shell structure, for Axis coordinate parameters, for Axis coordinate parameters, for Axis coordinate parameters, For any point in the initial 3D printed model of the car shell structure, The compressive stress component in the axial direction, For any point in the initial 3D printed model of the car shell structure, The compressive stress component in the axial direction, For any point in the initial 3D printed model of the car shell structure, The compressive stress component in the axial direction, For any point in the initial 3D printed model of the car shell structure, The shear stress component on the plane, For any point in the initial 3D printed model of the car shell structure, The shear stress component on the plane, For any point in the initial 3D printed model of the car shell structure, The shear stress component on the plane, The material density parameters for the initial 3D printing model of the car shell structure, Correction factor for the compression test score of the 3D model of the car shell structure, Scoring the bending test of the 3D model of the car shell structure, for The length of the housing structure in the axial direction, for The length of the housing structure in the axial direction, for The length of the housing structure in the axial direction, for The moment of inertia of the section in the axial direction, for The moment of inertia of the section in the axial direction, for The moment of inertia of the section in the axial direction, for Width of the cross section in the axial direction of the applied force, for Width of the cross section in the axial direction of the applied force, for Width of the cross section in the axial direction of the applied force, for Height of the cross section in the axial direction of the applied force, for Height of the cross section in the axial direction of the applied force, for Height of the cross section in the axial direction of the applied force, for Axis coordinate components, for Axis coordinate components, for Axis coordinate components, for Axis direction at any position The bending moment at for Axis direction at any position The bending moment at for Axis direction at any position The bending moment at for Axial force concentration load, for Axial force concentration load, for Axial force concentration load, Correction factor for the bending test score of the 3D model of the automobile shell structure, Scoring the impact test of the 3D model of the car shell structure, is the time range parameter of the impact test, is the integral time variable parameter of the impact test, For in time The impact force at is the maximum permissible impact force, For in time The impact energy absorbed by the model at is the maximum permissible absorbed energy, is the time attenuation parameter of the impact test, Correction factor for impact test scoring of 3D models of vehicle shell structures.

[0111] The present invention obtains a mechanical simulation test score calculation formula by using a specific mathematical model and verifying it, which is used to perform simulation test score calculation on the 3D printed initial model of the automobile shell structure. The mechanical simulation test score calculation formula first considers the stress distribution of the automobile shell structure in three spatial directions, and comprehensively considers the influence of normal stress and shear stress, which can comprehensively evaluate the performance of the automobile shell structure under stress. At the same time, the stress distribution is combined with the volume parameter of the structure to integrate the volume, which can consider the influence of stress in different regions on the overall performance, so as to more accurately evaluate the compressive performance of the structure. By introducing a correction coefficient, the score can be corrected according to the specific situation, taking into account the difference between the simulation and the actual situation, thereby improving the accuracy and reliability of the score. At the same time, by considering the material density parameter, this item can reflect the influence of the quality and density of the material on the structural performance, so that the compression test score is closer to the actual situation, thereby providing a detailed and comprehensive method to evaluate the compressive performance of the automobile shell structure, which helps to guide the design and optimization work and ensure the stability and safety of the structure under pressure. Secondly, the formula comprehensively considers the bending performance of the automobile shell structure in three spatial directions, and through the comprehensive evaluation of the section inertia moment and bending moment in each direction, it can comprehensively analyze the performance of the structure under stress. The section inertia moment is also introduced in the formula. These parameters reflect the bending capacity of the structure in different directions, taking into account the influence of the cross-sectional shape and size of the structure on its strength, so as to more accurately evaluate the bending performance. The width and height of the applied force cross section in the formula take into account the distribution of the applied force and the geometric shape of the structure, making the bending test score closer to the actual situation. In addition, the formula evaluates and analyzes the stress of the entire structure at different positions by considering the distribution of bending moments at different positions, thereby improving the accuracy of the bending test score. The correction factor is also introduced to correct the score according to the specific situation to take into account the difference between the simulation and the actual situation, thereby improving the reliability of the bending test score, which can provide a detailed and comprehensive method to evaluate the bending performance of the automobile shell structure, help guide the design and optimization work, and ensure the stability and safety of the structure under stress. Then, the formula also comprehensively considers the impact force and model absorbed energy during the impact test, as well as the time decay effect, to comprehensively evaluate the performance of the vehicle shell structure under impact. The time integral in the formula takes into account the changes in the impact force and model absorbed energy during the entire impact test period. By integrating these changes, the impact resistance of the structure is comprehensively evaluated. The impact force and model absorbed energy can also be compared with their maximum allowable values, thus considering the stress of the structure during the impact and its efficiency in absorbing energy.In addition, the formula also takes into account the time decay effect through exponential terms, that is, as time goes by, the impact force and absorbed energy gradually weaken the impact on the score, which is more in line with the actual situation. By introducing a correction factor, the score can be corrected according to the specific situation to take into account the difference between the simulation and the actual situation, thereby improving the reliability of the impact test score. This can provide a detailed and comprehensive method to evaluate the impact resistance of the automobile shell structure, help guide the design and optimization work, and ensure the stability and safety of the structure under impact. Therefore, this formula fully considers the compression test score of the 3D model of the automobile shell structure. , volume range parameters of the initial model of the 3D printed car shell structure , Axis coordinate parameters , Axis coordinate parameters , Axis coordinate parameters , along any point in the initial model of the 3D printed car shell structure Compressive stress component in the axial direction , along any point in the initial model of the 3D printed car shell structure Compressive stress component in the axial direction , along any point in the initial model of the 3D printed car shell structure Compressive stress component in the axial direction , along any point in the initial model of the 3D printed car shell structure Shear stress components on a plane , along any point in the initial model of the 3D printed car shell structure Shear stress components on a plane , along any point in the initial model of the 3D printed car shell structure Shear stress components on a plane , material density parameters of the initial model of the 3D printed car shell structure , Correction factor for compression test score of 3D model of automobile shell structure , 3D model bending test score of automobile shell structure , Housing structure length in axial direction , Housing structure length in axial direction , Housing structure length in axial direction , Section moment of inertia about the axis , Section moment of inertia about the axis , Section moment of inertia about the axis , Width of cross section of applied force in axial direction , Width of cross section of applied force in axial direction , Width of cross section of applied force in axial direction , Height of the cross section of the applied force in the axial direction , Height of the cross section of the applied force in the axial direction , Height of the cross section of the applied force in the axial direction , Axis coordinate components , Axis coordinate components , Axis coordinate components , Axis direction at any position Bending moment at , Axis direction at any position Bending moment at , Axis direction at any position Bending moment at , Axial force concentration load , Axial force concentration load , Axial force concentration load , Correction factor for the bending test score of the 3D model of the automobile shell structure , impact test score of 3D model of automobile shell structure , time range parameters of the impact test , integral time variable parameter for impact test , at time The impact force , maximum permissible impact force , at time The impact energy absorbed by the model at , the maximum allowable absorbed energy , shock test time decay parameters , Correction factor for impact test score of 3D model of automobile shell structure , which combines the volume range parameters of the initial model of the 3D printing of the car shell structure , Axis coordinate parameters , Axis coordinate parameters , Axis coordinate parameters , along any point in the initial model of the 3D printed car shell structure Compressive stress component in the axial direction , along any point in the initial model of the 3D printed car shell structure Compressive stress component in the axial direction , along any point in the initial model of the 3D printed car shell structure Compressive stress component in the axial direction , along any point in the initial model of the 3D printed car shell structure Shear stress components on a plane , along any point in the initial model of the 3D printed car shell structure Shear stress components on a plane , along any point in the initial model of the 3D printed car shell structure Shear stress components on a plane And the material density parameters of the initial 3D printed model of the car shell structure Constitutes a 3D model of the car shell structure compression test score Functional relationship:

[0112] ;

[0113] It also passes the correction factor of the compression test score of the 3D model of the automobile shell structure The introduction of can be adjusted according to the error in the calculation process, thereby improving the accuracy and applicability of the compression test score calculation. Axis coordinate parameters , Axis coordinate parameters , Axis coordinate parameters , Housing structure length in axial direction , Housing structure length in axial direction , Housing structure length in axial direction , Section moment of inertia about the axis , Section moment of inertia about the axis , Section moment of inertia about the axis , Axis coordinate components , Axis coordinate components , Axis coordinate components , Axis direction at any position Bending moment at , Axis direction at any position Bending moment at as well as Axis direction at any position Bending moment at Constitutes a 3D model of the car shell structure bending test score Functional relationship:

[0114] ;

[0115] Among them, by combining Width of cross section of applied force in axial direction as well as Height of the cross section of the applied force in the axial direction It constitutes a Section moment of inertia about the axis Functional relationship , Width of cross section of applied force in axial direction as well as Height of the cross section of the applied force in the axial direction It constitutes a Section moment of inertia about the axis Functional relationship , Width of cross section of applied force in axial direction as well as Height of the cross section of the applied force in the axial direction It constitutes a Section moment of inertia about the axis Functional relationship and by combining Axis coordinate parameters , Axis coordinate components , Housing structure length in axial direction as well as Axial force concentration load It constitutes a Axis direction at any position Bending moment at Functional relationship , Axis coordinate parameters , Axis coordinate components , Housing structure length in axial direction as well as Axial force concentration load It constitutes a Axis direction at any position Bending moment at Functional relationship , Axis coordinate parameters , Axis coordinate components , Housing structure length in axial direction as well as Axial force concentration load It constitutes a Axis direction at any position Bending moment at Functional relationship , and also passed the correction factor of the bending test score of the 3D model of the automobile shell structure The introduction of can be adjusted according to the error conditions in the calculation process, thereby improving the accuracy and applicability of the bending test score calculation. Then, by combining the time range parameters of the impact test , integral time variable parameter for impact test , at time The impact force , maximum permissible impact force , at time The impact energy absorbed by the model at , the maximum allowable absorbed energy And the impact test time decay parameters Constitutes a 3D model of the car shell structure impact test score Functional relationship , and also through the correction factor of the impact test score of the 3D model of the automobile shell structure The introduction of can be adjusted according to the error conditions that occur during the calculation process, thereby improving the accuracy and applicability of the impact test score calculation. In summary, this formula can realize the simulation test score calculation process of the 3D printed initial model of the automobile shell structure.

[0116] Preferably, step S45 includes the following steps:

[0117] Step S451: Based on the abnormal test results of the mechanical simulation of the automobile shell structure, the 3D printed initial model of the automobile shell structure is subjected to model abnormality problem identification and analysis to obtain abnormal problem information data of the 3D model of the automobile shell structure;

[0118] Step S452: performing abnormal improvement demand analysis on the 3D printed initial model of the automobile shell structure according to the abnormal problem information data of the automobile shell structure 3D model, and obtaining abnormal improvement direction demand data of the automobile shell structure 3D model;

[0119] Step S453: setting a model structure optimization target according to the abnormal improvement direction requirement data of the 3D model of the automobile shell structure, so as to obtain the optimization target data of the 3D model of the automobile shell structure;

[0120] Step S454: Based on the optimization target data of the 3D model of the automobile shell structure, the shell structure of the automobile shell structure 3D printing initial model is optimized to generate the automobile shell structure 3D printing optimization result.

[0121] In the embodiment of the present invention, firstly, by combining the abnormal test results of the mechanical simulation of the automobile shell structure, the corresponding 3D printed initial model of the automobile shell structure is subjected to a detailed abnormal problem identification analysis, which includes comprehensive detection and recording of the existing structural defects, insufficient strength or other abnormal conditions, so as to identify the existing abnormal problems, such as insufficient structural strength, stress concentration, unreasonable geometry, etc., so as to obtain detailed information data of the abnormal problems of the 3D model of the automobile shell structure. Secondly, according to the abnormal problem information data of the 3D model of the automobile shell structure obtained in the previous step, the corresponding initial model of the 3D printed automobile shell structure is subjected to abnormal improvement demand analysis, which step involves an in-depth analysis of the severity, impact range and possible improvement methods of each abnormal problem, so as to determine which aspects of the initial model of the 3D printed automobile shell structure need to be improved, such as material selection, structural design, reinforcement rib increase, etc., so as to obtain the demand data of the improvement direction. Then, by formulating the target of model structure optimization according to the abnormal improvement direction demand data of the 3D model of the automobile shell structure obtained by analysis, this step includes determining the main optimization target, such as improving structural strength, reducing weight, optimizing shape, etc., and establishing the corresponding specific indicators and requirements, so as to obtain the target data of the optimization of the 3D model of the automobile shell structure. Finally, based on the analysis and determination of the optimization target data of the 3D model of the automobile shell structure, the corresponding initial model of the 3D printing of the automobile shell structure is optimized. This step involves the redesign and optimization of the initial model of the 3D printing of the automobile shell structure by using advanced design software and tools to meet the aforementioned optimization goals and requirements, and finally generate the optimization results of the 3D printing of the automobile shell structure, thereby realizing the optimization of the design of the automobile shell structure.

[0122] The present invention firstly analyzes the abnormal problem identification of the 3D printed initial model of the automobile shell structure by combining the abnormal test results of the mechanical simulation of the automobile shell structure obtained by the test, and can identify the existing abnormal problems, such as insufficient structural strength, stress concentration, unreasonable geometry, etc., through a careful analysis of the simulation results, thereby providing the necessary information data basis for subsequent improvements. Through this analysis, potential problems can be discovered early, thereby providing data support for the subsequent optimization design of the automobile shell structure. Secondly, by analyzing the abnormal improvement needs of the 3D printed initial model of the automobile shell structure according to the abnormal problem information data of the 3D model of the automobile shell structure, the direction and needs of improvement can be extracted from the identified abnormal problems. Through the analysis of the abnormal problems, it can be determined which aspects need to be improved, such as material selection, structural design, reinforcement rib addition, etc. This step can provide a clear improvement direction for the subsequent optimization design, making the improvement work more targeted and efficient. Then, by setting the optimization target of the model structure according to the abnormal improvement direction demand data of the 3D model of the automobile shell structure, in order to clarify the optimization target, such as improving structural strength, reducing weight, optimizing streamline, etc., it can provide specific guidelines for the optimization design. The key to this step is to establish clear optimization targets so that subsequent design work can be carried out in a focused manner to achieve the expected optimization effect. Finally, the shell structure is optimized and designed for the initial 3D printed model of the automobile shell structure based on the optimization target data of the 3D model of the automobile shell structure. At this stage, the automobile shell structure can be redesigned according to the previous analysis and the set optimization targets to achieve the optimization effect, which includes the adjustment of the shape, the rearrangement of the reinforcement ribs, the optimization of the wall thickness, etc. Through the design work of this step, the optimized 3D printing results can be obtained, so that the final product has been improved in terms of structural performance and appearance.

[0123] Preferably, the present invention further provides a vehicle shell structure design system based on 3D printing technology, which is used to execute the vehicle shell structure design method based on 3D printing technology as described above. The vehicle shell structure design system based on 3D printing technology includes:

[0124] The automobile shell structure demand evaluation and analysis module is used to obtain the user's automobile shell structure information data, and perform functional demand and structural performance evaluation and analysis on the user's automobile shell structure information data, so as to obtain the automobile shell structure functional demand data and automobile shell structure performance demand status data;

[0125] The key design parameter analysis module of the automobile shell structure is used to perform shell structure function design analysis on the automobile shell structure function requirement data to obtain the automobile shell structure function design parameter set; perform performance key parameter statistical analysis on the automobile shell structure performance requirement status data to obtain the automobile shell structure performance key parameter set;

[0126] The 3D simulation printing module of the automobile shell structure is used to perform 3D simulation modeling and analysis according to the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance, so as to generate a 3D simulation space model of the automobile shell structure; the 3D simulation space model of the automobile shell structure is 3D printed and manufactured by using 3D printing technology, so as to obtain a 3D printed initial model of the automobile shell structure;

[0127] The automobile shell structure 3D model test optimization module is used to perform mechanical simulation tests on the initial 3D printed model of the automobile shell structure to obtain abnormal mechanical simulation test results of the automobile shell structure; based on the abnormal mechanical simulation test results of the automobile shell structure, the shell structure of the initial 3D printed model of the automobile shell structure is optimized to generate the 3D printing optimization results of the automobile shell structure.

[0128] In summary, the present invention provides a car shell structure design system based on 3D printing technology, which consists of a car shell structure demand assessment and analysis module, a car shell structure key design parameter analysis module, a car shell structure 3D simulation printing module and a car shell structure 3D model testing and optimization module. It can realize any car shell structure design method based on 3D printing technology described in the present invention, and is used to combine the operations between computer programs running on each module to realize a car shell structure design method based on 3D printing technology. The internal structures of the system cooperate with each other, which can greatly reduce duplication of work and manpower investment, and can also quickly and effectively provide a more accurate and efficient car shell structure design process, thereby simplifying the operation process of the car shell structure design system based on 3D printing technology.

[0129] Therefore, the embodiments should be regarded as illustrative and non-restrictive from all points, and the scope of the present invention is limited by the appended claims rather than the above description, and it is therefore intended that all changes falling within the meaning and range of equivalent elements of the application documents are included in the present invention.

[0130] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A method for designing a car shell structure based on 3D printing technology, characterized in that: The following steps are involved: Step S1: obtaining the user's automobile shell structure information data, and performing functional requirements and structural performance evaluation and analysis on the user's automobile shell structure information data to obtain automobile shell structure functional requirements data and automobile shell structure performance requirements status data; Step S2: performing a shell structure function design analysis on the automobile shell structure function requirement data to obtain a set of automobile shell structure function design parameters; Performing statistical analysis on key performance parameters of automobile shell structure performance demand data to obtain a set of key performance parameters of automobile shell structure; Step S3: performing 3D simulation modeling analysis according to the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance to generate a 3D simulation space model of the automobile shell structure; performing 3D printing and manufacturing on the 3D simulation space model of the automobile shell structure by using 3D printing technology to obtain a 3D printed initial model of the automobile shell structure; Step S4: performing a mechanical simulation test on the 3D printed initial model of the automobile shell structure to obtain an abnormal mechanical simulation test result of the automobile shell structure; Based on the abnormal test results of the automobile shell structure mechanical simulation, the shell structure optimization design of the initial model of the automobile shell structure 3D printing is carried out to generate the automobile shell structure 3D printing optimization results.

2. The automobile shell structure design method based on 3D printing technology according to claim 1 is characterized in that: Step S1 includes the following steps: Step S11: Acquire the user's car shell structure information data; Step S12: Performing functional requirement evaluation and analysis on the user's automobile shell structure information data to obtain automobile shell structure functional requirement data; Step S13: performing structure usage habit mining analysis on the user's car shell structure information data to obtain the user's car shell structure usage habit information data; Step S14: performing safety requirement identification analysis on the user's automobile shell structure information data to obtain the user's automobile shell structure safety requirement information data; Step S15: Based on the user's automobile shell structure usage habit information data and the user's automobile shell structure safety requirement information data, a structural performance evaluation and analysis is performed on the user's automobile shell structure information data to obtain automobile shell structure performance requirement status data.

3. The method for designing a vehicle shell structure based on 3D printing technology according to claim 1, characterized in that: Step S2 includes the following steps: Step S21: extracting the appearance and internal characteristic function requirements of the automobile shell structure function requirement data to obtain the appearance function requirement data of the automobile shell structure and the internal characteristic function requirement data of the automobile shell structure; Step S22: designing the structural appearance function parameters according to the automobile shell structural appearance function requirement data to obtain the automobile shell structural appearance function design parameter set; Step S23: designing the internal characteristic function parameters of the structure according to the internal characteristic function requirement data of the automobile shell structure, and obtaining the internal characteristic function design parameter set of the automobile shell structure; Step S24: merging the automobile shell structure appearance function design parameter set and the automobile shell structure internal characteristic function design parameter set to obtain the automobile shell structure function design parameter set; Step S25: Performing statistical analysis on key performance parameters of the automobile shell structure performance requirement status data to obtain a set of key performance parameters of the automobile shell structure.

4. The method for designing a vehicle shell structure based on 3D printing technology according to claim 3, characterized in that: Step S25 includes the following steps: Step S251: Designing structural performance parameters for the automobile shell structural performance requirement data to obtain an initial parameter set of the automobile shell structural performance; Step S252: performing performance dimension evaluation and analysis on the automobile shell structure performance demand status data to obtain automobile shell structure performance dimension data; performing dimension classification processing on the automobile shell structure performance initial parameter set based on the automobile shell structure performance dimension data to obtain automobile shell structure performance parameter sets under different performance dimensions; Step S253: performing correlation evaluation analysis on the performance parameter sets of the automobile shell structure under different performance dimensions to obtain correlation relationship data between the performance parameters of the automobile shell structure under different performance dimensions; performing correlation influence exploration analysis on the performance parameter sets of the automobile shell structure under different performance dimensions based on the correlation relationship data between the performance parameters of the automobile shell structure under different performance dimensions to obtain correlation influence factors between the performance parameters of the automobile shell structure under different performance dimensions; Step S254: performing association weight allocation processing on the automobile shell structure performance parameter sets under different performance dimensions based on the association relationship data between the automobile shell structure performance parameters under different performance dimensions, and obtaining the automobile shell structure performance association weight coefficients under different performance dimensions; performing importance evaluation and analysis on the automobile shell structure performance parameter sets under different performance dimensions according to the automobile shell structure performance association weight coefficients under different performance dimensions and the association influencing factors between the automobile shell structure performance parameters under different performance dimensions, and obtaining the importance of the automobile shell structure performance parameters under different performance dimensions; Step S255: performing key parameter screening processing on the automobile shell structure performance parameter sets under different performance dimensions according to the importance of the automobile shell structure performance parameters under different performance dimensions, and obtaining the automobile shell structure performance key parameter set.

5. The method for designing a vehicle shell structure based on 3D printing technology according to claim 1, characterized in that: Step S3 includes the following steps: Step S31: performing a structural topological mapping analysis on a set of functional design parameters of an automobile shell structure and a set of key parameters of performance of an automobile shell structure to obtain a topological mapping space of design parameters of an automobile shell structure; Step S32: performing spatial feature analysis on the topological mapping space of the automobile shell structure design parameters to obtain the topological spatial feature data of the automobile shell structure design; Step S33: performing structural layer thickness corner point and structural distribution corner point detection on the topological space feature data of the automobile shell structure design to obtain the structural layer thickness corner point feature data of the automobile shell structure and the structural distribution corner point feature data of the automobile shell structure; Step S34: performing 3D simulation modeling analysis on the topological mapping space of the design parameters of the automobile shell structure according to the thickness corner point feature data of the automobile shell structure and the distribution corner point feature data of the automobile shell structure to generate a 3D simulation space model of the automobile shell structure; Step S35: 3D printing is performed on the 3D simulation space model of the automobile shell structure by using 3D printing technology to obtain an initial 3D printed model of the automobile shell structure.

6. The method for designing a vehicle shell structure based on 3D printing technology according to claim 5, characterized in that: Step S35 includes the following steps: Step S351: using 3D printing technology to perform fused deposition printing modeling on the 3D simulation space model of the automobile shell structure to obtain a 3D fused printing model of the automobile shell structure; Step S352: performing polishing and curing processing on the 3D melt-printed model of the automobile shell structure to obtain a 3D printed, polished and cured model of the automobile shell structure; Step S353: assembling and painting the 3D printed, polished and cured model of the automobile shell structure to obtain an initial 3D printed model of the automobile shell structure.

7. The automobile shell structure design method based on 3D printing technology according to claim 1 is characterized in that: Step S4 includes the following steps: Step S41: using a mechanical simulation test score calculation formula to perform simulation test score calculation on the 3D printed initial model of the automobile shell structure, so as to obtain a compression test score of the 3D model of the automobile shell structure, a bending test score of the 3D model of the automobile shell structure, and an impact test score of the 3D model of the automobile shell structure; Step S42: performing test weight allocation processing on the compression test score of the 3D model of the automobile shell structure, the bending test score of the 3D model of the automobile shell structure, and the impact test score of the 3D model of the automobile shell structure, so as to obtain the compression test weight of the 3D model of the automobile shell structure, the bending test weight of the 3D model of the automobile shell structure, and the impact test weight of the 3D model of the automobile shell structure; Step S43: performing a comprehensive evaluation and analysis on the compression test score of the 3D model of the automobile shell structure, the bending test score of the 3D model of the automobile shell structure, and the impact test score of the 3D model of the automobile shell structure according to the compression test weight of the 3D model of the automobile shell structure, the bending test weight of the 3D model of the automobile shell structure, and the impact test weight of the 3D model of the automobile shell structure, to obtain a comprehensive score value of the mechanical test of the 3D model of the automobile shell structure; Step S44: comparing and judging the comprehensive mechanical test score of the 3D model of the automobile shell structure according to the preset mechanical test score standard threshold, when the comprehensive mechanical test score of the 3D model of the automobile shell structure is greater than or equal to the preset mechanical test score standard threshold, the mechanical simulation test result of the 3D model of the automobile shell structure corresponding to the comprehensive mechanical test score of the 3D model of the automobile shell structure is marked as normal; when the comprehensive mechanical test score of the 3D model of the automobile shell structure is less than the preset mechanical test score standard threshold, the mechanical simulation test result of the 3D model of the automobile shell structure corresponding to the comprehensive mechanical test score of the 3D model of the automobile shell structure is marked as abnormal; the mechanical simulation test results of the 3D initial model of the automobile shell structure that are marked as abnormal are screened out to obtain abnormal mechanical simulation test results of the automobile shell structure; Step S45: Based on the abnormal test results of the mechanical simulation of the automobile shell structure, the shell structure of the automobile shell structure 3D printing initial model is optimized to generate the automobile shell structure 3D printing optimization results.

8. The method for designing a vehicle shell structure based on 3D printing technology according to claim 7, characterized in that: The mechanical simulation test score calculation formula in step S41 is specifically: ； ； ； ； ； In the formula, Scoring the compression test of the 3D model of the car shell structure, The volume range parameters of the initial model of the 3D printed car shell structure, for Axis coordinate parameters, for Axis coordinate parameters, for Axis coordinate parameters, For any point in the initial 3D printed model of the car shell structure, The compressive stress component in the axial direction, For any point in the initial 3D printed model of the car shell structure, The compressive stress component in the axial direction, For any point in the initial 3D printed model of the car shell structure, The compressive stress component in the axial direction, For any point in the initial 3D printed model of the car shell structure, The shear stress component on the plane, For any point in the initial 3D printed model of the car shell structure, The shear stress component on the plane, For any point in the initial 3D printed model of the car shell structure, The shear stress component on the plane, The material density parameters for the initial 3D printing model of the car shell structure, Correction factor for the compression test score of the 3D model of the car shell structure, Scoring the bending test of the 3D model of the car shell structure, for The length of the housing structure in the axial direction, for The length of the housing structure in the axial direction, for The length of the housing structure in the axial direction, for The moment of inertia of the section in the axial direction, for The moment of inertia of the section in the axial direction, for The moment of inertia of the section in the axial direction, for Width of the cross section in the axial direction of the applied force, for Width of the cross section in the axial direction of the applied force, for Width of the cross section in the axial direction of the applied force, for Height of the cross section in the axial direction of the applied force, for Height of the cross section in the axial direction of the applied force, for Height of the cross section in the axial direction of the applied force, for Axis coordinate components, for Axis coordinate components, for Axis coordinate components, for Axis direction at any position The bending moment at for Axis direction at any position The bending moment at for Axis direction at any position The bending moment at for Axial force concentration load, for Axial force concentration load, for Axial force concentration load, Correction factor for the bending test score of the 3D model of the automobile shell structure, Scoring the impact test of the 3D model of the car shell structure, is the time range parameter of the impact test, is the integral time variable parameter of the impact test, For in time The impact force at is the maximum permissible impact force, For in time The impact energy absorbed by the model at is the maximum permissible absorbed energy, is the time attenuation parameter of the impact test, Correction factor for impact test scoring of 3D models of vehicle shell structures.

9. The method for designing a vehicle shell structure based on 3D printing technology according to claim 7, characterized in that: Step S45 includes the following steps: Step S451: Based on the abnormal test results of the mechanical simulation of the automobile shell structure, the 3D printed initial model of the automobile shell structure is subjected to model abnormality problem identification and analysis to obtain abnormal problem information data of the 3D model of the automobile shell structure; Step S452: performing abnormal improvement demand analysis on the 3D printed initial model of the automobile shell structure according to the abnormal problem information data of the automobile shell structure 3D model, and obtaining abnormal improvement direction demand data of the automobile shell structure 3D model; Step S453: setting a model structure optimization target according to the abnormal improvement direction requirement data of the 3D model of the automobile shell structure, so as to obtain the optimization target data of the 3D model of the automobile shell structure; Step S454: Based on the optimization target data of the 3D model of the automobile shell structure, the shell structure of the automobile shell structure 3D printing initial model is optimized to generate the automobile shell structure 3D printing optimization result.

10. The automobile shell structure design system based on 3D printing technology is characterized by: Used to execute the automobile shell structure design method based on 3D printing technology as claimed in claim 1, the automobile shell structure design system based on 3D printing technology includes: The automobile shell structure demand evaluation and analysis module is used to obtain the user's automobile shell structure information data, and perform functional demand and structural performance evaluation and analysis on the user's automobile shell structure information data, so as to obtain the automobile shell structure functional demand data and automobile shell structure performance demand status data; The key design parameter analysis module of the automobile shell structure is used to perform shell structure function design analysis on the automobile shell structure function requirement data to obtain the automobile shell structure function design parameter set; perform performance key parameter statistical analysis on the automobile shell structure performance requirement status data to obtain the automobile shell structure performance key parameter set; The 3D simulation printing module of the automobile shell structure is used to perform 3D simulation modeling and analysis according to the functional design parameter set of the automobile shell structure and the key parameter set of the automobile shell structure performance, so as to generate a 3D simulation space model of the automobile shell structure; the 3D simulation space model of the automobile shell structure is 3D printed and manufactured by using 3D printing technology, so as to obtain a 3D printed initial model of the automobile shell structure; The automobile shell structure 3D model test optimization module is used to perform mechanical simulation tests on the initial 3D printed model of the automobile shell structure to obtain abnormal mechanical simulation test results of the automobile shell structure; based on the abnormal mechanical simulation test results of the automobile shell structure, the shell structure of the initial 3D printed model of the automobile shell structure is optimized to generate the 3D printing optimization results of the automobile shell structure.

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