Analysis method, system, storage medium and computer for vehicle frame and its accessories

Abstract

The present invention provides an analysis method, system, storage medium and computer for a vehicle frame and its accessories. The method includes: constructing a geometric model according to input conditions in the design stage and overall scanning data of the vehicle frame and its accessories to be tested; importing the geometric model into finite element processing software for processing to form a finite element mesh model; constructing a CAE analysis model according to the actual data of the vehicle frame and its accessories and the finite element mesh model; sequentially performing NVH attribute analysis, vehicle state strength analysis and local working condition strength analysis on the CAE analysis model to obtain multiple analysis data; sequentially judging whether each analysis data meets the preset standard corresponding to each data; if each data meets the preset standard, judging that the actual data of the vehicle frame and its accessories are qualified. The present invention can identify in advance whether the vehicle frame and its accessories have potential failure risk problems in strength and durability in the early design stage, and can avoid related design risk problems in the design stage of components.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to an analysis method, system, storage medium and computer for a vehicle frame and its accessories. Background Art

[0002] With the rapid development of the automobile industry and the improvement of people's living standards, cars have become an indispensable part of people's lives. Therefore, more and more people are beginning to pay attention to the safety performance of cars.

[0003] The frame and its main accessories are essential parts of the car. Their function is to support and connect various parts of the car, such as the chassis, suspension and cab assembly parts, and at the same time bear various loads transmitted to them by various parts. Therefore, the structural performance requirements of the main accessories of the frame are very strict. In the actual driving process, due to the unevenness of the road surface, the main accessory structure of the frame will be subjected to various alternating loads. Therefore, in the design process of the frame structure, fatigue reliability design is a very important link.

[0004] When the car is driving, the external excitations generated by the road surface and the car engine will be directly transmitted to the main accessories of the frame through the wheels. If the structure design of the main accessories of the frame is unreasonable, it will resonate with the external excitation, causing failure modes such as cracking or even fracture, which will directly affect the reliability, durability and safety performance of the whole vehicle. The current analysis method is usually to judge whether the performance of the entire vehicle meets the design requirements. However, even if the performance of the whole vehicle meets the design requirements in the early stage, during the vehicle durability test, many main accessories of the frame are still prone to cracking and failure, resulting in a decrease in the safety performance of the whole vehicle and a safety hazard. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an analysis method, system, storage medium and computer for a vehicle frame and its accessories, so as to at least solve the deficiencies in the above-mentioned technology.

[0006] The present invention provides an analysis method for a vehicle frame and its accessories, comprising:

[0007] Performing an overall scan on the vehicle frame and its accessories of the vehicle to be tested, and constructing a geometric model of the vehicle frame and its accessories according to the input conditions in the design phase and the overall scanned data;

[0008] Importing the geometric model into finite element processing software for meshing, and discretizing to form a finite element mesh model of the frame and its accessories;

[0009] Acquire actual data of the vehicle frame and its accessories, and construct a corresponding CAE analysis model based on the actual data and the finite element mesh model;

[0010] Sequentially performing NVH property analysis, vehicle state strength analysis, and local working condition strength analysis on the CAE analysis model to obtain corresponding first analysis data, second analysis data, third analysis data, and fourth analysis data;

[0011] sequentially determining whether the first analysis data, the second analysis data, the third analysis data, and the fourth analysis data meet the preset standards corresponding to the respective data;

[0012] If the first analysis data, the second analysis data, the third analysis data and the fourth analysis data all meet the preset standards corresponding to the data, then the actual data of the vehicle frame and its accessories are determined to be qualified.

[0013] Furthermore, the step of performing NVH property analysis on the CAE analysis model includes:

[0014] Performing NVH property analysis on the CAE analysis model to obtain modal data and response data corresponding to the vehicle frame and its accessories;

[0015] Inputting the modal data and the response data into a preset database in sequence, predicting whether there is coupling resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency;

[0016] If there is no coupled resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency, it is determined that the NVH properties of the vehicle frame and its accessories are qualified.

[0017] Furthermore, before the step of performing vehicle state strength analysis on the CAE analysis model, the method further includes:

[0018] Performing dynamic load decomposition on the CAE analysis model to obtain dynamic load distribution data of the CAE analysis model;

[0019] The strain value of the CAE analysis model under the external input load is calculated, and the dynamic load distribution curve of the CAE analysis model is constructed using the strain value and the dynamic load distribution data.

[0020] Furthermore, the step of performing vehicle state strength analysis on the CAE analysis model includes:

[0021] Performing a whole vehicle simulation experiment on the CAE analysis model, and obtaining a road surface excitation signal in the whole vehicle simulation experiment;

[0022] Acquire the hard point dynamic load in the dynamic load distribution curve, and use the hard point dynamic load and the road surface excitation signal as simulation input data;

[0023] Using the simulation input data, performing a whole vehicle state strength and durability simulation analysis on the CAE analysis model to obtain corresponding simulation analysis data;

[0024] The simulation analysis data is compared with a first preset threshold value. If the simulation analysis data is not within the first preset threshold value, it is determined that the vehicle frame and its accessories are unqualified in terms of overall vehicle strength durability.

[0025] Furthermore, the step of performing local working condition strength analysis on the CAE analysis model includes:

[0026] Classifying the accessories into first-category accessories and second-category accessories according to preset standards;

[0027] sequentially analyzing a plurality of load data of the first type of accessories and the second type of accessories under a plurality of working conditions, wherein the plurality of working conditions at least include a static vertical working condition, a turning working condition, a torsional working condition, and a braking working condition;

[0028] Inputting each of the load data into a preset standard database to obtain the limit load data of the first type of accessories and the second type of accessories;

[0029] Using the limit load data and the target load data, the yield durability data corresponding to the first type of accessory and the second type of accessory are obtained;

[0030] The yield durability data is compared with a second preset threshold value, and if the yield durability data is not within the yield durability threshold value, it is determined that the strength durability of the accessory is unqualified.

[0031] The present invention also provides an analysis system for a vehicle frame and its accessories, comprising:

[0032] A first construction module is used to perform an overall scan on the vehicle frame and its accessories of the vehicle to be tested, and to construct a geometric model of the vehicle frame and its accessories according to the input conditions in the design stage and the overall scanned data;

[0033] A second construction module is used to import the geometric model into finite element processing software for meshing, and discretize to form a finite element mesh model of the frame and its accessories;

[0034] A first acquisition module, used to acquire actual data of the vehicle frame and its accessories, and construct a corresponding CAE analysis model according to the actual data and the finite element mesh model;

[0035] An analysis module, used to sequentially perform NVH property analysis, vehicle state strength analysis, and local working condition strength analysis on the CAE analysis model to obtain corresponding first analysis data, second analysis data, third analysis data, and fourth analysis data;

[0036] a judgment module, used to judge in sequence whether the first analysis data, the second analysis data, the third analysis data and the fourth analysis data meet the preset standards corresponding to the data;

[0037] The determination module is used to determine that the actual data of the frame and its accessories are qualified if the first analysis data, the second analysis data, the third analysis data and the fourth analysis data all meet the preset standards corresponding to the data.

[0038] Furthermore, the analysis module includes:

[0039] An NVH property analysis unit, used for performing NVH property analysis on the CAE analysis model to obtain modal data and response data corresponding to the vehicle frame and its accessories;

[0040] A prediction unit, used to input the modal data and the response data into a preset database in sequence, and predict whether there is coupling resonance between the frame and its accessories and the road surface and the engine excitation frequency;

[0041] The first determination unit is used to determine that the NVH properties of the vehicle frame and its accessories are qualified if there is no coupling resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency.

[0042] Furthermore, the system also includes:

[0043] A dynamic load decomposition module, used for performing dynamic load decomposition on the CAE analysis model to obtain dynamic load distribution data of the CAE analysis model;

[0044] The third construction module is used to calculate the strain value of the CAE analysis model under the action of the external input load, and to construct the dynamic load distribution curve of the CAE analysis model using the strain value and the dynamic load distribution data.

[0045] Furthermore, the analysis module also includes:

[0046] A whole vehicle simulation experiment unit, used to perform a whole vehicle simulation experiment on the CAE analysis model and obtain a road surface excitation signal in the whole vehicle simulation experiment;

[0047] A first acquisition unit, used for acquiring a hard point dynamic load in the dynamic load distribution curve, and using the hard point dynamic load and the road surface excitation signal as simulation input data;

[0048] A strength and durability simulation analysis unit, used to perform a whole vehicle state strength and durability simulation analysis on the CAE analysis model using the simulation input data to obtain corresponding simulation analysis data;

[0049] The second determination unit is used to compare the simulation analysis data with a first preset threshold value, and if the simulation analysis data is not within the first preset threshold value, determine that the vehicle state strength durability of the frame and its accessories is unqualified.

[0050] Furthermore, the analysis module also includes:

[0051] A classification unit, used for classifying the accessories into first-category accessories and second-category accessories according to a preset standard;

[0052] A second acquisition unit is used to sequentially acquire a plurality of load data of the first type of accessories and the second type of accessories under a plurality of working conditions, wherein the plurality of working conditions at least include a static vertical working condition, a turning working condition, a torsional working condition and a braking working condition;

[0053] A first calculation unit, used for inputting each of the load data into a preset standard database to obtain the limit load data of the first type of accessory and the second type of accessory;

[0054] A second calculation unit is used to obtain yield durability data corresponding to the first type of accessory and the second type of accessory by using the limit load data and the target load data;

[0055] The third determination unit is used to compare the yield durability data with a second preset threshold value, and if the yield durability data is not within the yield durability threshold value, determine that the strength durability of the accessory is unqualified.

[0056] The present invention also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned analysis method of the vehicle frame and its accessories is implemented.

[0057] The present invention also provides a computer, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned analysis method of the vehicle frame and its accessories when executing the computer program.

[0058] The analysis method, system, storage medium and computer of the vehicle frame and its accessories in the present invention obtain the geometric model of the vehicle frame and its accessories, discretize the geometric model into a finite element mesh model, generate a corresponding CAE analysis model based on actual data and the finite element mesh model, and judge whether the vehicle frame and its accessories are qualified through NVH properties, vehicle state strength and local working condition strength analysis results. It can identify in advance whether the vehicle frame and its accessories have potential failure risk problems in strength and durability in the early design stage, avoid related design risk problems in the design stage of parts, ensure fatigue durability accuracy and acceptance rate, reduce the probability of redesign and rectification due to late failure of the project, shorten the development cycle, reduce test costs, and at the same time make up for the shortcomings of traditional verification methods and improve verification robustness. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a flow chart of a method for analyzing a vehicle frame and its accessories in a first embodiment of the present invention;

[0060] Figure 2 for Figure 1 Detailed flowchart of the first sub-step in step S104;

[0061] Figure 3 is a partial flow chart of a method for analyzing a vehicle frame and its accessories in another embodiment of the present invention;

[0062] Figure 4 for Figure 1 Detailed flowchart of the second sub-step in step S104;

[0063] Figure 5 for Figure 1 Detailed flowchart of the third sub-step in step S104;

[0064] Figure 6 is a structural block diagram of an analysis system for a vehicle frame and its accessories in a second embodiment of the present invention;

[0065] Figure 7 FIG. 4 is a structural block diagram of a computer in a third embodiment of the present invention.

[0066] Description of main component symbols:

[0067] Memory 10 First acquisition module 13 processor 20 Analysis Module 14 Computer Programs 30 Judgment module 15 First building block 11 Determination module 16 Second building block 12

[0068] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0069] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0070] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0072] Embodiment 1

[0073] See also Figure 1 , which shows the analysis method of the frame and its accessories in the first embodiment of the present invention, and the method specifically includes steps S101 to S106:

[0074] S101, performing an overall scan on the vehicle frame and its accessories of the vehicle to be tested, and constructing a geometric model of the vehicle frame and its accessories according to the input conditions in the design stage and the overall scan data;

[0075] In a specific implementation, the frame and its accessories of the vehicle to be tested are scanned as a whole, and the input conditions of the vehicle to be tested in the design stage are used as boundary data, and the data after the overall scan and the boundary data are used to construct a geometric model of the frame and its accessories;

[0076] It should be noted that in this embodiment, a three-dimensional modeling software (Catia, etc.) is used to build a three-dimensional CAD model of the frame and its accessories. After the modeling is completed, it is exported into a corresponding format file (for example: *.step or *.igs format).

[0077] S102, importing the geometric model into finite element processing software to perform mesh division, and discretizing to form a finite element mesh model of the frame and its accessories;

[0078] S103, acquiring actual data of the vehicle frame and its accessories, and constructing a corresponding CAE analysis model according to the actual data and the finite element mesh model;

[0079] In the specific implementation, the established geometric model is imported into the finite element pre-processing software, the neutral surface is extracted for meshing, and the finite element mesh model of the frame and its accessories is formed by discretization.

[0080] When establishing the finite element mesh model, for the above-mentioned frame and its accessories, the material of each part and the connection relationship between each part can be constructed according to the actual structure of the frame and its accessories; because the frame uses thin-walled steel, the neutral surface is extracted, and then the actual geometric dimensions are used to define the thickness of each plate. When dividing the mesh, in order to prevent the subsequent MNF calculation file from being too large, the 2D mesh of the frame is limited to about 10mm. For the castings on the frame, the 3D mesh size is determined according to the specific situation of the casting, usually a mesh of 5 to 10mm. The aspect ratio is less than 5, the warpage is less than 15 degrees, the minimum angle of the quadrilateral unit is greater than 45 degrees, the maximum angle of the quadrilateral unit is less than 135 degrees, the minimum angle of the triangular unit is greater than 30 degrees, the maximum angle of the triangular unit is less than 120 degrees, the skewness is less than 60 degrees, and the Jacobian ratio is greater than 0.7. In addition to the above quality requirements, free edges are not allowed between units, repeated units are not allowed, the unit normals on the same modeling surface must be consistent, and material parameters include Young's modulus, Poisson's ratio and density.

[0081] In the finite element mesh model of this embodiment, there are four main ways to connect the frame. The first is the weld (sean unit) connection, the second is the bolt (Bar unit) connection, the third is the rigid connection, and the fourth is the unit node merging method. The four connection methods are selected according to actual needs.

[0082] It should also be added here that the pre-processing software for modeling can be Hypermesh or ANSA.

[0083] The actual parameters obtained above are combined with the above finite element mesh model to establish a corresponding CAE analysis model.

[0084] S104, sequentially performing NVH property analysis, vehicle state strength analysis, and local working condition strength analysis on the CAE analysis model to obtain corresponding first analysis data, second analysis data, third analysis data, and fourth analysis data;

[0085] For further information, see Figure 2In step S104, the step of performing NVH property analysis on the CAE analysis model includes steps S1041 to S1043:

[0086] S1041, performing NVH property analysis on the CAE analysis model to obtain modal data and response data corresponding to the vehicle frame and its accessories;

[0087] S1042, inputting the modal data and the response data into a preset database in sequence, predicting whether there is coupling resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency;

[0088] S1043: If there is no coupling resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency, it is determined that the NVH properties of the vehicle frame and its accessories are qualified.

[0089] In specific implementation, the NVH property analysis is performed on the above-mentioned CAE analysis model to obtain the modal data and response data corresponding to the frame and its accessories, and the modal data and response data are input into a preset database in sequence. It should be noted that the analysis conditions of the frames and accessories of multiple vehicles that have been tested are used as data input and stored as the corresponding database. When the modal data and its response data are obtained, the database can directly predict whether there is a coupling resonance between the excitation frequency of the corresponding frame and its accessories and the road surface and the engine through the modal data and its response data. If there is no coupling resonance between the frame and its accessories and the road surface and the engine excitation frequency, it means that the NVH properties of the frame and its accessories are qualified.

[0090] It should be noted that, in other embodiments, the method of judging the above-mentioned modal data and response data can also be that when both the modal data and the response data are not within their corresponding thresholds (30HZ), it means that there are abnormalities in the modal data and the response data.

[0091] Please note that Figure 3 In some optional embodiments, before the step of performing vehicle state strength analysis on the CAE analysis model in step S104, the method further specifically includes steps S114 to S124:

[0092] S114, performing dynamic load decomposition on the CAE analysis model to obtain dynamic load distribution data of the CAE analysis model;

[0093] S124, calculating the strain value of the CAE analysis model under the external input load, and constructing a dynamic load distribution curve of the CAE analysis model using the strain value and the dynamic load distribution data.

[0094] In the specific implementation, the above-mentioned CAE analysis model is dynamically decomposed, and the dynamics of the frame and its accessories under the action of dynamic load are calculated, thereby obtaining the dynamic load distribution data of the CAE analysis model. The strain value of the CAE analysis model is calculated under the action of external input load, and the corresponding strain value and dynamic load distribution data are used to establish a strain-dynamic load distribution diagram, that is, the dynamic load distribution curve of the CAE analysis model.

[0095] It can be understood that this step can make the dynamic load distribution of the frame and its accessories more obvious, and then the whole vehicle state strength and durability of the frame and its accessories can be calculated through corresponding operations.

[0096] For details, please refer to Figure 4 In step S104, the step of performing vehicle state strength analysis on the CAE analysis model includes steps S1141 to S1144:

[0097] S1141, performing a whole vehicle simulation experiment on the CAE analysis model, and obtaining a road surface excitation signal in the whole vehicle simulation experiment;

[0098] S1142, obtaining the hard point dynamic load in the dynamic load distribution curve, and using the hard point dynamic load and the road surface excitation signal as simulation input data;

[0099] S1143, using the simulation input data to perform a whole vehicle state strength and durability simulation analysis on the CAE analysis model to obtain corresponding simulation analysis data;

[0100] S1144, comparing the simulation analysis data with a first preset threshold value, if the simulation analysis data is not within the first preset threshold value, determining that the vehicle state strength durability of the frame and its accessories is unqualified.

[0101] In the specific implementation, a whole vehicle simulation experiment is carried out on the CAE analysis model, and the road excitation signal collected from the test site and the hard point dynamic load in the dynamic load distribution curve obtained in the above steps are used as simulation input data for the whole vehicle state strength and durability simulation analysis of the frame and its accessories, and then the corresponding simulation analysis data are obtained. If the simulation analysis data falls within a first preset threshold (this value is usually a whole vehicle state strength and durability value range known to those skilled in the art), it means that the whole vehicle state strength and durability of the frame and its accessories are qualified. If it does not fall within the first preset threshold, it means that the whole vehicle state strength and durability of the frame and its accessories are unqualified.

[0102] For further information, see Figure 5In the step S104, the step of performing local working condition strength analysis on the CAE analysis model includes steps S1241 to S1245:

[0103] S1241, classifying the accessories into first-category accessories and second-category accessories according to a preset standard;

[0104] S1242, sequentially acquiring a plurality of load data of the first type of accessories and the second type of accessories under a plurality of working conditions, wherein the plurality of working conditions at least include a static vertical working condition, a turning working condition, a torsional working condition, and a braking working condition;

[0105] S1243, inputting each of the load data into a preset standard database to obtain the limit load data of the first type of accessory and the second type of accessory;

[0106] S1244, using the limit load data and the target load data, obtaining yield durability data corresponding to the first type of accessory and the second type of accessory;

[0107] S1245, comparing the yield durability data with a second preset threshold value, and if the yield durability data is not within the yield durability threshold value, determining that the strength durability of the accessory is unqualified.

[0108] In the specific implementation, the accessories are distinguished according to the component type, the multi-link type accessories are regarded as the first type of accessories, and the other accessories are regarded as the second type of accessories. The second type of accessories are classified into two sub-categories according to the mass. In the first type of accessories, the yield strength durability is calculated by the torsional displacement method. In the second type of accessories, when the mass of the accessories is ≤10Kg, the frequency response analysis method is used to determine the yield strength durability. When the mass of the accessories is ≥10Kg, the gravity field analysis method is used to determine the yield strength durability.

[0109] Multiple load data of the first type of accessories and the second type of accessories under various working conditions are obtained in sequence, and the various working conditions at least include static vertical conditions, turning conditions, torsional conditions and braking conditions; for example: strength and durability analysis of the stabilizer bar mounting bracket, determining the applied torsional displacement based on the stabilizer bar stroke to verify the strength and durability performance of the modified component.

[0110] The load data obtained as described above are input into the above-mentioned standard database, in which the calculation formulas for the ultimate load data of each component are also stored. The ultimate load data of each component can be calculated from the above-mentioned load data. The yield durability data corresponding to the first-category accessory and the second-category accessory are calculated using the formula: yield durability data = target load data / ultimate load data, wherein the target load data is the load data when the first-category accessory and the second-category accessory are at the yield limit under each working condition.

[0111] The obtained yield durability data is compared with a second preset threshold value (this value is usually a numerical range known to people skilled in the art). If the yield durability data is not within the yield durability threshold value, it is determined that the strength durability of the accessory is unqualified; if the yield durability data is within the yield durability threshold value, it is determined that the strength durability of the accessory is qualified.

[0112] S105, determining in sequence whether the first analysis data, the second analysis data, the third analysis data, and the fourth analysis data meet the preset standards corresponding to the data;

[0113] S106: If the first analysis data, the second analysis data, the third analysis data and the fourth analysis data all meet the preset standards corresponding to the data, then it is determined that the actual data of the vehicle frame and its accessories are qualified.

[0114] In summary, the analysis method of the vehicle frame and its accessories in the above-mentioned embodiment of the present invention obtains a geometric model of the vehicle frame and its accessories, and discretizes the geometric model into a finite element mesh model, generates a corresponding CAE analysis model according to actual data and the finite element mesh model, and judges whether the vehicle frame and its accessories are qualified through NVH properties, vehicle state strength and local working condition strength analysis results. It can identify in advance whether the vehicle frame and its accessories have potential failure risk problems in strength and durability in the early design stage, avoid related design risk problems in the design stage of parts, ensure fatigue durability accuracy and acceptance rate, reduce the probability of redesign and rectification due to late failure of the project, shorten the development cycle, reduce test costs, and at the same time make up for the shortcomings of traditional verification methods and improve verification robustness.

[0115] Embodiment 2

[0116] Another aspect of the present invention is to provide an analysis system for a vehicle frame and its accessories. Figure 6 , shown is an analysis system of a vehicle frame and its accessories in a second embodiment of the present invention, comprising:

[0117] The first construction module 11 is used to perform an overall scan on the frame and its accessories of the vehicle to be tested, and to construct a geometric model of the frame and its accessories according to the input conditions in the design stage and the overall scanned data;

[0118] The second construction module 12 is used to import the geometric model into the finite element processing software for meshing, and discretize to form a finite element mesh model of the frame and its accessories;

[0119] A first acquisition module 13 is used to acquire actual data of the frame and its accessories, and to construct a corresponding CAE analysis model according to the actual data and the finite element mesh model;

[0120] An analysis module 14 is used to sequentially perform NVH property analysis, vehicle state strength analysis, and local working condition strength analysis on the CAE analysis model to obtain corresponding first analysis data, second analysis data, third analysis data, and fourth analysis data;

[0121] Furthermore, the analysis module 14 includes:

[0122] An NVH property analysis unit, used for performing NVH property analysis on the CAE analysis model to obtain modal data and response data corresponding to the vehicle frame and its accessories;

[0123] A prediction unit, used to input the modal data and the response data into a preset database in sequence, and predict whether there is coupling resonance between the frame and its accessories and the road surface and the engine excitation frequency;

[0124] The first determination unit is used to determine that the NVH properties of the vehicle frame and its accessories are qualified if there is no coupling resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency.

[0125] Furthermore, the analysis module 14 also includes:

[0126] A whole vehicle simulation experiment unit, used to perform a whole vehicle simulation experiment on the CAE analysis model and obtain a road surface excitation signal in the whole vehicle simulation experiment;

[0127] A first acquisition unit, used for acquiring a hard point dynamic load in the dynamic load distribution curve, and using the hard point dynamic load and the road surface excitation signal as simulation input data;

[0128] A strength and durability simulation analysis unit, used to perform a whole vehicle state strength and durability simulation analysis on the CAE analysis model using the simulation input data to obtain corresponding simulation analysis data;

[0129] The second determination unit is used to compare the simulation analysis data with a first preset threshold value, and if the simulation analysis data is not within the first preset threshold value, determine that the vehicle frame and its accessories are unqualified in terms of vehicle state strength and durability.

[0130] Furthermore, the analysis module 14 also includes:

[0131] A classification unit, used for classifying the accessories into first-category accessories and second-category accessories according to a preset standard;

[0132] A second acquisition unit is used to sequentially acquire a plurality of load data of the first type of accessories and the second type of accessories under a plurality of working conditions, wherein the plurality of working conditions at least include a static vertical working condition, a turning working condition, a torsional working condition and a braking working condition;

[0133] A first calculation unit, used for inputting each of the load data into a preset standard database to obtain the limit load data of the first type of accessory and the second type of accessory;

[0134] A second calculation unit is used to obtain yield durability data corresponding to the first type of accessory and the second type of accessory by using the limit load data and the target load data;

[0135] The third determination unit is used to compare the yield durability data with a second preset threshold value, and if the yield durability data is not within the yield durability threshold value, determine that the strength durability of the accessory is unqualified.

[0136] A judgment module 15 is used to judge in sequence whether the first analysis data, the second analysis data, the third analysis data and the fourth analysis data meet the preset standards corresponding to the data;

[0137] The determination module 16 is configured to determine that the actual data of the vehicle frame and its accessories are qualified if the first analysis data, the second analysis data, the third analysis data and the fourth analysis data all meet the preset standards corresponding to the data.

[0138] In other optional embodiments, the system further includes:

[0139] A dynamic load decomposition module, used for performing dynamic load decomposition on the CAE analysis model to obtain dynamic load distribution data of the CAE analysis model;

[0140] The third construction module is used to calculate the strain value of the CAE analysis model under the action of the external input load, and to construct the dynamic load distribution curve of the CAE analysis model using the strain value and the dynamic load distribution data.

[0141] The functions or operation steps implemented when the above modules and units are executed are generally the same as those in the above method embodiments, and will not be repeated here.

[0142] The analysis system for the vehicle frame and its accessories provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the system embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0143] Embodiment 4

[0144] The present invention also provides a computer, see Figure 7 , shown is a computer in the fourth embodiment of the present invention, including a memory 10, a processor 20, and a computer program 30 stored in the memory 10 and executable on the processor 20. When the processor 20 executes the computer program 30, the above-mentioned analysis method of the frame and its accessories is implemented.

[0145] The memory 10 includes at least one type of storage medium, including flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory, etc.), magnetic memory, disk, optical disk, etc. In some embodiments, the memory 10 may be an internal storage unit of a computer, such as a hard disk of the computer. In other embodiments, the memory 10 may also be an external storage device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card, etc. Further, the memory 10 may also include both an internal storage unit of a computer and an external storage device. The memory 10 may be used not only to store application software and various types of data installed in the computer, but also to temporarily store data that has been output or is to be output.

[0146] Among them, in some embodiments, the processor 20 can be an electronic control unit (Electronic Control Unit, abbreviated as ECU, also known as a vehicle computer), a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, a microprocessor or other data processing chip, used to run the program code stored in the memory 10 or process data, such as executing access restriction programs, etc.

[0147] It should be pointed out that Figure 7 The structure shown does not constitute a limitation on the computer. In other embodiments, the computer may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0148] The embodiment of the present invention further provides a storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned analysis method of the vehicle frame and its accessories is implemented.

[0149] Those skilled in the art will appreciate that the logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0150] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0151] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0152] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0153] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for analyzing a vehicle frame and its accessories, characterized in that: include: Performing an overall scan on the vehicle frame and its accessories of the vehicle to be tested, and constructing a geometric model of the vehicle frame and its accessories according to the input conditions in the design phase and the overall scanned data; Importing the geometric model into finite element processing software for meshing, and discretizing to form a finite element mesh model of the frame and its accessories; Acquire actual data of the vehicle frame and its accessories, and construct a corresponding CAE analysis model based on the actual data and the finite element mesh model; The CAE analysis model is sequentially subjected to NVH property analysis, vehicle state strength analysis, and local working condition strength analysis to obtain corresponding first analysis data, second analysis data, third analysis data, and fourth analysis data, wherein the step of performing local working condition strength analysis on the CAE analysis model includes: The accessories are divided into first-class accessories and second-class accessories according to preset standards, wherein, in the first-class accessories, the yield strength durability is calculated by torsional displacement, and in the second-class accessories, when the mass is ≤10Kg, the yield strength durability is determined by frequency response analysis method, and when the mass is ≥10Kg, the yield strength durability is determined by gravity field analysis method; Sequentially acquiring a plurality of load data of the first type of accessories and the second type of accessories under a plurality of working conditions, wherein the plurality of working conditions at least include a static vertical working condition, a turning working condition, a torsional working condition, and a braking working condition; Inputting each of the load data into a preset standard database to obtain the limit load data of the first type of accessories and the second type of accessories; Using the limit load data and the target load data, the yield durability data corresponding to the first type of accessory and the second type of accessory are obtained; Comparing the yield durability data with a second preset threshold, and if the yield durability data is not within the yield durability threshold, determining that the strength durability of the accessory is unqualified; sequentially determining whether the first analysis data, the second analysis data, the third analysis data, and the fourth analysis data meet the preset standards corresponding to the respective data; If the first analysis data, the second analysis data, the third analysis data and the fourth analysis data all meet the preset standards corresponding to the data, then the actual data of the vehicle frame and its accessories are determined to be qualified.

2. The method for analyzing a vehicle frame and its accessories according to claim 1, characterized in that: The steps of performing NVH property analysis on the CAE analysis model include: Performing NVH property analysis on the CAE analysis model to obtain modal data and response data corresponding to the vehicle frame and its accessories; Inputting the modal data and the response data into a preset database in sequence, predicting whether there is coupling resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency; If there is no coupled resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency, it is determined that the NVH properties of the vehicle frame and its accessories are qualified.

3. The method for analyzing a vehicle frame and its accessories according to claim 1, characterized in that: Before the step of performing vehicle state strength analysis on the CAE analysis model, the method further comprises: Performing dynamic load decomposition on the CAE analysis model to obtain dynamic load distribution data of the CAE analysis model; The strain value of the CAE analysis model under the external input load is calculated, and the dynamic load distribution curve of the CAE analysis model is constructed using the strain value and the dynamic load distribution data.

4. The method for analyzing a vehicle frame and its accessories according to claim 3, characterized in that: The step of performing vehicle state strength analysis on the CAE analysis model comprises: Performing a whole vehicle simulation experiment on the CAE analysis model, and obtaining a road surface excitation signal in the whole vehicle simulation experiment; Acquire the hard point dynamic load in the dynamic load distribution curve, and use the hard point dynamic load and the road surface excitation signal as simulation input data; Using the simulation input data, performing a whole vehicle state strength and durability simulation analysis on the CAE analysis model to obtain corresponding simulation analysis data; The simulation analysis data is compared with a first preset threshold value. If the simulation analysis data is not within the first preset threshold value, it is determined that the vehicle frame and its accessories are unqualified in terms of overall vehicle strength durability.

5. An analysis system for a vehicle frame and its accessories, characterized in that: include: A first construction module is used to perform an overall scan on the vehicle frame and its accessories of the vehicle to be tested, and to construct a geometric model of the vehicle frame and its accessories according to the input conditions in the design stage and the overall scanned data; A second construction module is used to import the geometric model into finite element processing software for meshing, and discretize to form a finite element mesh model of the frame and its accessories; A first acquisition module, used for acquiring actual data of the frame and its accessories, and constructing a corresponding CAE analysis model according to the actual data and the finite element mesh model; An analysis module is used to sequentially perform NVH property analysis, vehicle state strength analysis, and local working condition strength analysis on the CAE analysis model to obtain corresponding first analysis data, second analysis data, third analysis data, and fourth analysis data, wherein the analysis module includes: A classification unit is used to classify the accessories into a first-class accessory and a second-class accessory according to a preset standard, wherein, in the first-class accessory, the yield strength durability is calculated by a torsional displacement method, and in the second-class accessory, when the accessory has a mass ≤ 10 kg, the yield strength durability is determined by a frequency response analysis method, and when the accessory has a mass ≥ 10 kg, the yield strength durability is determined by a gravity field analysis method; A second acquisition unit is used to sequentially acquire a plurality of load data of the first type of accessories and the second type of accessories under a plurality of working conditions, wherein the plurality of working conditions at least include a static vertical working condition, a turning working condition, a torsional working condition and a braking working condition; A first calculation unit, used for inputting each of the load data into a preset standard database to obtain the limit load data of the first type of accessory and the second type of accessory; A second calculation unit is used to obtain yield durability data corresponding to the first type of accessory and the second type of accessory by using the limit load data and the target load data; A third determination unit is used to compare the yield durability data with a second preset threshold value, and if the yield durability data is not within the yield durability threshold value, determine that the strength durability of the accessory is unqualified; a judgment module, used to judge in sequence whether the first analysis data, the second analysis data, the third analysis data and the fourth analysis data meet the preset standards corresponding to the data; The determination module is used to determine that the actual data of the frame and its accessories are qualified if the first analysis data, the second analysis data, the third analysis data and the fourth analysis data all meet the preset standards corresponding to the data.

6. The analysis system for a vehicle frame and its accessories according to claim 5, characterized in that: The analysis module comprises: An NVH property analysis unit, used for performing NVH property analysis on the CAE analysis model to obtain modal data and response data corresponding to the vehicle frame and its accessories; A prediction unit, used to input the modal data and the response data into a preset database in sequence, and predict whether there is coupling resonance between the frame and its accessories and the road surface and the engine excitation frequency; The first determination unit is used to determine that the NVH properties of the vehicle frame and its accessories are qualified if there is no coupling resonance between the vehicle frame and its accessories and the road surface and the engine excitation frequency.

7. The analysis system for a vehicle frame and its accessories according to claim 5, characterized in that: The system further comprises: A dynamic load decomposition module, used for performing dynamic load decomposition on the CAE analysis model to obtain dynamic load distribution data of the CAE analysis model; The third construction module is used to calculate the strain value of the CAE analysis model under the action of the external input load, and to construct the dynamic load distribution curve of the CAE analysis model using the strain value and the dynamic load distribution data.

8. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the analysis method of the vehicle frame and its accessories as claimed in any one of claims 1 to 4 is implemented.

9. A computer comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for analyzing the vehicle frame and its accessories as claimed in any one of claims 1 to 4 is implemented.

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