Body structure design method, device, computer equipment and storage medium

Abstract

The present invention discloses a vehicle body structure design method, device, computer device and storage medium. The vehicle body structure design method includes obtaining simulation performance constraint conditions corresponding to target performances, where the target performances include stiffness performance, NVH performance and collision performance; obtaining target parts based on the stiffness performance, NVH performance and collision performance; obtaining a reference thickness value of the target parts, and performing thickness sampling processing on the target parts based on the reference thickness value to obtain a target thickness sample corresponding to the target parts; performing performance simulation tests on the target thickness sample to obtain a target simulation result corresponding to the target parts; constructing a simulation response surface based on the target simulation result corresponding to the target parts; and obtaining an optimal vehicle body solution based on the simulation response surface corresponding to the target parts. In the vehicle design process of the present invention, the coupling effect of the stiffness performance, NVH performance and collision performance is comprehensively considered, the number of repeated calculations and optimizations of the design scheme is reduced, and the design speed is accelerated.

Description

Technical Field

[0001] The present invention relates to the field of vehicle body design, and in particular to a vehicle body structure design method, device, computer equipment and storage medium. Background Art

[0002] During the body structure design process, collision performance, body stiffness performance and NVH performance are often optimized separately. The optimization process does not take into account the correlation between the three types of performance, which makes the optimization plan lack of globality, and there are conflicts in performance indicators or excess body structure performance. In addition, due to separate optimization, each professional group needs to repeatedly adjust the plan, which makes the development cycle long. Summary of the invention

[0003] Embodiments of the present invention provide a vehicle body structure design method, device, computer equipment and storage medium to solve the problem that a vehicle body structure optimization scheme lacks globality, has performance index conflicts or vehicle body structure performance excess.

[0004] A vehicle body structure design method, comprising:

[0005] Acquire simulation performance constraint conditions corresponding to target performance, wherein the target performance includes stiffness performance, NVH performance, and collision performance;

[0006] Based on the stiffness performance, the NVH performance and the collision performance, the vehicle body force transmission path parts are screened to obtain target parts;

[0007] Acquire a reference thickness value of the target part, and perform thickness sampling processing on the target part based on the reference thickness value to obtain a target thickness sample corresponding to the target part;

[0008] Performing a performance simulation test on a target thickness sample corresponding to the target part to obtain a target simulation result corresponding to the target part;

[0009] Based on the target simulation result corresponding to the target part, construct a simulation response surface corresponding to the target part;

[0010] Based on the simulation response surface corresponding to the target part, a target optimal vehicle body solution that meets the simulation performance constraint condition is obtained.

[0011] A vehicle body structure design device, comprising:

[0012] A simulation performance constraint condition acquisition module, used to acquire simulation performance constraint conditions corresponding to target performance, wherein the target performance includes stiffness performance, NVH performance and collision performance;

[0013] A target part acquisition module, configured to screen the vehicle body force transmission path parts based on the stiffness performance, the NVH performance, and the collision performance, and acquire target parts;

[0014] A target thickness sample acquisition module, configured to acquire a reference thickness value of the target part, and perform thickness sampling processing on the target part based on the reference thickness value to acquire a target thickness sample corresponding to the target part;

[0015] A target simulation result acquisition module, configured to perform performance simulation tests on the target thickness sample corresponding to the target part to acquire a target simulation result corresponding to the target part;

[0016] A simulation response surface acquisition module, configured to construct a simulation response surface corresponding to the target part based on the target simulation result corresponding to the target part;

[0017] A target optimal vehicle body solution acquisition module, configured to acquire a target optimal vehicle body solution that meets the simulation performance constraint conditions based on the simulation response surface corresponding to the target part. A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above vehicle body structure design method are implemented.

[0018] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the above vehicle body structure design method are implemented.

[0019] The above-mentioned vehicle body structure design method, device, computer equipment and storage medium include obtaining simulation performance constraint conditions corresponding to target performances, where the target performances include stiffness performance, NVH performance, and collision performance. Taking stiffness performance, NVH performance, and collision performance as target performances and comprehensively considering the coupling effects of the three performances during the design process can reduce the number of repeated calculations and optimizations of the design scheme and improve the design and development efficiency of the vehicle body structure. Based on the stiffness performance, the NVH performance, and the collision performance, screening the vehicle body force transmission path parts to obtain target parts can effectively reduce the computational amount in the vehicle body structure design process and speed up the design speed. Obtaining the reference thickness value of the target parts and, based on the reference thickness value, performing thickness sampling on the target parts to obtain the target thickness samples corresponding to the target parts to speed up the efficiency of sample acquisition. Determining the initial thickness samples within the standard thickness range as the target thickness samples corresponding to the target parts ensures that the selected target thickness samples conform to the actual situation. Performing multi-disciplinary performance simulation tests on the target thickness samples corresponding to the target parts to obtain the target simulation results corresponding to the target parts to determine the influence of different thicknesses of the target parts on the target performances, providing technical support for subsequent generation of the target optimal vehicle body solution. Based on the target simulation results corresponding to the target parts, constructing the simulation response surface corresponding to the target parts to achieve automated construction of the simulation response surface. Based on the simulation response surface corresponding to the target parts, obtaining the target optimal vehicle body solution that meets the simulation performance constraint conditions. Since the simulation performance constraint conditions are set corresponding to the target performances, and the target performances include stiffness performance, NVH performance, and collision performance, the obtained target optimal vehicle body solution comprehensively considers the coupling effects of stiffness performance, NVH performance, and collision performance, which can reduce the number of repeated calculations and optimizations of the design scheme and simultaneously achieve the lightest vehicle body. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a flowchart of a vehicle body structure design method in an embodiment of the present invention;

[0022] Figure 2 It is another flowchart of a vehicle body structure design method in an embodiment of the present invention;

[0023] Figure 3 It is another flowchart of a vehicle body structure design method in an embodiment of the present invention;

[0024] Figure 4 It is another flowchart of the vehicle body structure design method in an embodiment of the present invention;

[0025] Figure 5 It is another flowchart of the vehicle body structure design method in an embodiment of the present invention;

[0026] Figure 6 It is another flowchart of the vehicle body structure design method in an embodiment of the present invention;

[0027] Figure 7 It is another flowchart of the vehicle body structure design method in an embodiment of the present invention;

[0028] Figure 8 It is a principle block diagram of a vehicle body structure design device in an embodiment of the present invention;

[0029] Figure 9 It is a schematic diagram of a computer device in an embodiment of the present invention. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] The vehicle body structure design method provided by the embodiments of the present invention can be applied to a computer device. The computer device can execute the vehicle body structure design method to realize the vehicle design process, comprehensively consider the coupling effects of stiffness performance, NVH performance, and collision performance, reduce the number of times of repeated checking and optimization of the design scheme, and speed up the design speed.

[0032] In one embodiment, as Figure 1 shown, a vehicle body structure design method is provided. The method includes the following steps:

[0033] S101: Obtain the simulation performance constraint conditions corresponding to the target performance, where the target performance includes stiffness performance, NVH performance, and collision performance.

[0034] Among them, the target performance refers to the performance required for vehicle design. In this embodiment, the target performance includes but is not limited to stiffness performance, NVH performance, and collision performance.

[0035] The simulation performance constraint conditions are the restrictive conditions for the value range of the target performance in the optimization design. In this embodiment, according to the design purpose of the vehicle body structure design, the value range of the target performance is limited to obtain the simulation performance constraint conditions, providing a basis for the subsequent vehicle body structure design.

[0036] Exemplarily, the design purpose of the vehicle body structure design is a five-star target. At this time, the value range of the target performance is that the collision intrusion amount cannot be greater than a mm, and the acceleration cannot exceed b g; the torsional / bending stiffness of the vehicle body is greater than c N*mm, that is, the simulation performance constraint conditions are that the collision intrusion amount cannot be greater than a mm, the acceleration cannot exceed b g; the torsional / bending stiffness of the vehicle body is greater than c N*mm.

[0037] In this embodiment, taking the stiffness performance, NVH performance, and collision performance as the target performance, and comprehensively considering the coupling effect of the three performances in the design process can reduce the number of repeated calculations and optimizations of the design scheme, and improve the design and development efficiency of the vehicle body structure.

[0038] S102: Based on the stiffness performance, NVH performance, and collision performance, screen the vehicle body force transmission path parts to obtain the target parts.

[0039] Among them, the vehicle body force transmission path parts include the upper vehicle body parts and the lower vehicle body parts. For example, the vehicle body force transmission path parts include but are not limited to B-pillars, door sills, cross-member brackets, and floor assemblies, etc.

[0040] The target parts are the parts screened from the vehicle body force transmission path parts that have a positive strengthening effect on the target performance.

[0041] In this embodiment, through the performance analysis tool, analyze the stiffness performance, NVH performance, and collision performance of all vehicle body force transmission path parts to accurately screen out the parts that have a positive strengthening effect on the stiffness performance, NVH performance, and collision performance as the target parts; or the vehicle body historical data of all vehicle body force transmission path parts required for the vehicle body structure design can be obtained by querying the database, so as to screen out the parts that have a positive strengthening effect on the stiffness performance, NVH performance, and collision performance as the target parts according to the vehicle body historical data, and speed up the screening speed.

[0042] In this embodiment, pre-screen the vehicle body force transmission path parts to obtain the target parts, which can effectively reduce the calculation amount in the vehicle body structure design process, speed up the design speed, and avoid subsequent processing of unnecessary vehicle body force transmission path parts, increasing the calculation amount.

[0043] S103: Obtain the reference thickness value of the target parts, and based on the reference thickness value, perform thickness sampling on the target parts to obtain the target thickness samples corresponding to the target parts.

[0044] Among them, the reference thickness value refers to the standard thickness of the target part. The target thickness sample is a sample representing the thickness of the target part. Understandably, the target thickness samples corresponding to a target part include multiple thickness values that the target part can select.

[0045] In this embodiment, based on the reference thickness value of each target part, the Monte Carlo simulation algorithm is used to randomly generate the initial thickness sample corresponding to each target part to improve the efficiency of sample acquisition. The initial thickness samples within the standard thickness range are determined as the target thickness samples corresponding to the target parts, ensuring that the selected target thickness samples conform to the actual situation. In this embodiment, the standard thickness range refers to the range between the maximum thickness and the minimum thickness of the target part with the reference thickness value as the reference.

[0046] S104: Perform a performance simulation test on the target thickness sample corresponding to the target part to obtain the target simulation result corresponding to the target part.

[0047] The target simulation result refers to the result obtained by simulating the target thickness sample.

[0048] In this embodiment, the target thickness sample of the target part is input into the multi-disciplinary performance analysis tool, so that the multi-disciplinary performance analysis tool analyzes the target thickness sample to obtain the target simulation result of the target part, to determine the influence of different thicknesses of the target part on the target performance, and to provide technical support for generating the target optimal body solution subsequently.

[0049] S105: Construct a simulation response surface corresponding to the target part based on the target simulation result corresponding to the target part.

[0050] In this embodiment, according to the target simulation result, the Kriging algorithm is used to construct the simulation response surface to realize the automatic construction of the simulation response surface. Among them, the Kriging algorithm is a spatial interpolation algorithm, which adds local variability on the basis of the overall response and can handle situations with relatively drastic changes, and can fit a simulation response surface according to the existing target simulation results.

[0051] S106: Obtain the target optimal body solution that meets the simulation performance constraint conditions based on the simulation response surface corresponding to the target part.

[0052] In this embodiment, since the simulation performance constraint conditions are set corresponding to the target performance, and the target performance includes stiffness performance, NVH performance, and collision performance, the obtained target optimal body solution comprehensively considers the coupling effects of stiffness performance, NVH performance, and collision performance, which can reduce the number of times of repeated checking and optimization of the design scheme and realize the lightest body at the same time.

[0053] The body structure design method provided in this embodiment obtains the simulation performance constraint conditions corresponding to the target performance. The target performance includes stiffness performance, NVH performance, and collision performance. Taking stiffness performance, NVH performance, and collision performance as the target performance and comprehensively considering the coupling effect of the three performances in the design process can reduce the number of repeated calculations and optimizations of the design scheme and improve the efficiency of body structure design and development. Based on stiffness performance, NVH performance, and collision performance, screen the body force transmission path parts to obtain the target parts, which can effectively reduce the calculation amount in the body structure design process and speed up the design speed. Obtain the reference thickness value of the target parts. Based on the reference thickness value, perform thickness sampling on the target parts to obtain the target thickness samples corresponding to the target parts to speed up the efficiency of sample acquisition. Determine the initial thickness samples within the standard thickness range as the target thickness samples corresponding to the target parts to ensure that the selected target thickness samples conform to the actual situation. Perform multidisciplinary performance simulation tests on the target thickness samples corresponding to the target parts to obtain the target simulation results corresponding to the target parts to determine the influence of different thicknesses of the target parts on the target performance and provide technical support for generating the target optimal body solution subsequently. Based on the target simulation results corresponding to the target parts, construct the simulation response surface corresponding to the target parts to realize the automatic construction of the simulation response surface. Based on the simulation response surface corresponding to the target parts, obtain the target optimal body solution that meets the simulation performance constraint conditions. Since the simulation performance constraint conditions are set corresponding to the target performance, and the target performance includes stiffness performance, NVH performance, and collision performance, the obtained target optimal body solution comprehensively considers the coupling effect of stiffness performance, NVH performance, and collision performance, which can reduce the number of repeated calculations and optimizations of the design scheme and at the same time achieve the lightest body weight.

[0054] As an embodiment, as Figure 2 shown, step S102, that is, based on stiffness performance, NVH performance, and collision performance, screen the body force transmission path parts to obtain the target parts, including:

[0055] S201: Perform stiffness performance tests on all body force transmission path parts to obtain the stiffness correlation corresponding to each body force transmission path part, and determine the body force transmission path parts with stiffness correlation meeting the stiffness performance threshold as the first parts.

[0056] Among them, the stiffness correlation is used to reflect the degree of influence of the body force transmission path parts on the stiffness performance. It can be understood that the higher the stiffness correlation of the body force transmission path parts, the greater the influence of the body force transmission path parts on the stiffness performance of the vehicle. If the stiffness correlation of the body force transmission path parts is not greater than 0, it means that the body force transmission path parts cannot affect the stiffness performance of the vehicle and may even weaken the stiffness performance. At this time, delete the body force transmission path parts.

[0057] The stiffness performance threshold refers to a preset threshold related to the stiffness performance. Understandably, the value of this stiffness performance threshold is not less than 0 to exclude the body force transmission path parts that have no influence or negative influence on the stiffness performance.

[0058] The first part refers to the body force transmission path part whose stiffness correlation meets the stiffness performance threshold.

[0059] In this embodiment, by using the stiffness performance threshold, it is possible to automatically screen the body force transmission path parts, exclude the body force transmission path parts that have no influence or negative influence on the stiffness performance, reduce unnecessary parts, reduce the amount of calculation, and improve the design speed.

[0060] S202: Conduct NVH performance tests on all body force transmission path parts, obtain the NVH correlation corresponding to each body force transmission path part, and determine the body force transmission path parts whose NVH correlation meets the NVH performance threshold as the second parts.

[0061] Among them, the NVH correlation is used to reflect the degree of influence of the body force transmission path part on the NVH performance. Understandably, the higher the NVH correlation of the body force transmission path part, the greater the influence of the body force transmission path part on the NVH performance of the vehicle. If the NVH correlation of the body force transmission path part is not greater than 0, it means that the body force transmission path part cannot have an impact on the NVH performance of the vehicle, and even weakens the NVH performance. At this time, the body force transmission path part will be deleted.

[0062] The NVH performance threshold refers to a preset threshold related to the NVH performance. Understandably, the value of this NVH performance threshold is not less than 0 to exclude the body force transmission path parts that have no influence or negative influence on the NVH performance.

[0063] The second part refers to the body force transmission path part whose NVH correlation meets the NVH performance threshold.

[0064] In this embodiment, by using the NVH performance threshold, it is possible to automatically screen the body force transmission path parts, exclude the body force transmission path parts that have no influence or negative influence on the NVH performance, reduce unnecessary parts, reduce the amount of calculation, and improve the design speed.

[0065] S203: Conduct collision performance tests on all body force transmission path parts, obtain the collision correlation corresponding to each body force transmission path part, and determine the body force transmission path parts whose collision correlation meets the collision performance threshold as the third parts.

[0066] Among them, the collision correlation is used to reflect the degree of influence of the parts on the body force transmission path on the collision performance. It can be understood that the higher the collision correlation of the parts on the body force transmission path, the greater the influence of the parts on the collision performance of the vehicle. If the collision correlation of the parts on the body force transmission path is not greater than 0, it means that the parts on the body force transmission path cannot affect the collision performance of the vehicle, or even weaken the collision performance. At this time, the parts on the body force transmission path will be deleted.

[0067] The collision performance threshold is a pre-set threshold related to the collision performance. It can be understood that the value of the collision performance threshold is not less than 0 to exclude the parts on the body force transmission path that have no influence or negative influence on the collision performance.

[0068] The third part refers to the parts on the body force transmission path whose collision correlation meets the collision performance threshold.

[0069] In this embodiment, by using the collision performance threshold, the parts on the body force transmission path can be automatically screened, excluding the parts on the body force transmission path that have no influence or negative influence on the collision performance, reducing unnecessary parts, reducing the amount of calculation, and improving the design speed.

[0070] S204: The target parts include the first part, the second part, and the third part.

[0071] The vehicle body structure design method provided in this embodiment, through stiffness performance testing, NVH performance testing, and collision performance testing on the parts on the vehicle body force transmission path, selects the first part, the second part, and the third part screened from the parts on the vehicle body force transmission path as the target parts, which can effectively reduce the parts on the vehicle body force transmission path that are irrelevant to the target performance and weaken the target performance, reduce the amount of calculation, improve the design efficiency, and reduce a large amount of repetitive checking work.

[0072] As an embodiment, as Figure 3 shown, step S103, that is, obtaining the reference thickness value of the target part, includes:

[0073] S301: Obtain the initial thickness value of the target part, and determine the initial moment of inertia and the initial fully plastic section moment of the target part based on the initial thickness value.

[0074] Among them, the initial thickness value is a pre-defined thickness value of the target part.

[0075] The initial moment of inertia is a geometric quantity, usually used to describe the property of a section to resist bending.

[0076] The initial fully plastic section moment is a kind of internal moment on the section of the target part. It can be understood as the moment required for the target part to bend.

[0077] S302: Obtain the true thickness value of the benchmark vehicle model, and determine the true moment of inertia and true fully plastic section moment corresponding to the target part based on the true thickness value.

[0078] Among them, the true thickness value refers to the thickness value of the target part in the benchmark vehicle model. In this embodiment, the target vehicle model corresponding to the body to be designed is obtained, and the true thickness value of the target part in the benchmark vehicle model is obtained by querying the body historical data in the database, so as to calculate the true moment of inertia and true fully plastic section moment according to the true thickness value, provide data support for determining the target thickness value, and at the same time reduce the calculation amount of randomly estimating the reference thickness value.

[0079] S303: When the initial moment of inertia is greater than the true moment of inertia and the initial fully plastic section moment is greater than the true fully plastic section moment, the initial thickness value is determined as the reference thickness value.

[0080] In this embodiment, by calculating the inertia difference between the initial moment of inertia and the true moment of inertia of the target part, and the moment difference between the initial fully plastic section moment and the true fully plastic section moment, when the inertia difference is positive and the moment difference is positive, the initial moment of inertia is greater than the true moment of inertia, and the initial fully plastic section moment is greater than the true fully plastic section moment. At this time, the initial thickness value is determined as the target thickness value to ensure that the target thickness value meets the actual production requirements and has high practicability. Subsequently, based on the target thickness value, the produced target thickness samples can also meet the actual production requirements. When the inertia difference is negative, or the moment difference is negative, that is, the initial moment of inertia is not greater than the true moment of inertia, or the initial fully plastic section moment is not greater than the true fully plastic section moment, the initial thickness value is increased according to the inertia difference and the moment difference to obtain the modified thickness value, and the modified moment of inertia and modified fully plastic section moment of the target part are determined until the modified moment of inertia is greater than the true moment of inertia and the modified fully plastic section moment is greater than the true fully plastic section moment, then the modified thickness value is determined as the target thickness value. It can be understood that the initial thickness value is modified according to the inertia difference and the moment difference to ensure better modification effect, and the modification is based on real data, which can reduce the number of modifications and speed up the design speed.

[0081] The vehicle body structure design method provided in this embodiment obtains the initial thickness value of the target part, and determines the initial moment of inertia and the initial fully plastic section moment of the target part based on the initial thickness value; obtains the actual thickness value of the benchmark vehicle model, and determines the actual moment of inertia and the actual fully plastic section moment corresponding to the target part based on the benchmark vehicle model, providing data support for determining the target thickness value and reducing the calculation amount of randomly estimating the benchmark thickness value at the same time. When the initial moment of inertia is greater than the actual moment of inertia and the initial fully plastic section moment is greater than the actual fully plastic section moment, the initial thickness value is determined as the benchmark thickness value to ensure that the target thickness value meets the actual production requirements, which has high practicability. Subsequently, based on the target thickness value, the produced target thickness samples can also meet the actual production requirements.

[0082] As an embodiment, as Figure 4 shown, step S103, that is, based on the benchmark thickness value, perform thickness sampling processing on the target part to obtain the target thickness samples corresponding to the target part, including:

[0083] S401: Based on the benchmark thickness value, obtain the standard thickness range corresponding to the target part, and obtain N to-be-processed thickness values of the target part within the standard thickness range.

[0084] Among them, the standard thickness range refers to the thickness range corresponding to the target part. It can be understood that one target part corresponds to one standard thickness range.

[0085] The to-be-processed thickness value refers to the thickness value that the target part can take.

[0086] In this embodiment, the thickness expansion coefficient is used to expand the thickness range of the benchmark thickness value of the target part to determine the standard thickness range of each target part; then, within the standard thickness range of the target part, N to-be-processed thickness values are obtained to ensure that the to-be-processed thickness values of the target part meet the actual production conditions.

[0087] S402: Perform hierarchical processing on the N to-be-processed thickness values to obtain M thickness sub-layers, where 1 ≤ M < N.

[0088] Among them, the thickness sub-layer refers to the sub-layer obtained by hierarchically processing the to-be-processed thickness values.

[0089] In this embodiment, the difference between the maximum value and the minimum value among the N to-be-processed thickness values is obtained, and the difference is equally divided into M parts to divide the N to-be-processed thickness values into M thickness sub-layers, providing technical support for subsequent sampling.

[0090] S403: Sample each thickness sub-layer to obtain M target thickness samples corresponding to the target part.

[0091] In this embodiment, N thickness values to be processed are divided into M thickness sub-layers, and one thickness value to be processed is extracted from each thickness sub-layer as a target thickness sample, ensuring a higher spatial coverage rate of the target thickness sample and a smaller standard deviation of the obtained target thickness sample, achieving a higher sampling accuracy with a smaller sampling scale to accelerate the design speed. In this embodiment, N thickness values to be processed are divided into M thickness sub-layers, and each thickness sub-layer is sampled to obtain M target thickness samples corresponding to the target part. It can be understood that if the correlation of the thickness values to be processed between two adjacent thickness sub-layers is enhanced, then by sampling each thickness sub-layer, the target thickness samples of the same target part obtained can have the characteristic of geometric correlation, and it can also ensure that the standard deviation of the obtained target thickness sample is smaller. In this embodiment, because the target thickness samples of the same target part have the characteristic of geometric correlation, it is possible to reduce the number of target thickness samples of each target part while ensuring the accuracy of subsequent simulations, saving the software and hardware resources required for automotive performance numerical analysis to accelerate the design speed.

[0092] The body structure design method provided in this embodiment obtains N thickness values to be processed of the target part within the standard thickness range to ensure that the thickness values to be processed of the target part meet the actual production conditions. The N thickness values to be processed are stratified to obtain M thickness sub-layers, providing technical support for subsequent sampling. Each thickness sub-layer is sampled to obtain M target thickness samples corresponding to the target part, ensuring a higher spatial coverage rate of the target thickness sample and a smaller standard deviation of the obtained target thickness sample, achieving a higher sampling accuracy with a smaller sampling scale to accelerate the design speed.

[0093] As an embodiment, as Figure 5 shown, step S104, that is, performing multidisciplinary performance simulation tests on the target thickness samples corresponding to the target part to obtain the target simulation results corresponding to the target part, includes:

[0094] S501: Using a finite element analysis tool to perform stiffness performance simulation analysis on the target thickness samples corresponding to the target part to obtain the target stiffness analysis results.

[0095] Among them, the finite element analysis tool, that is, Nastran, refers to a finite element analysis solver.

[0096] In this embodiment, the target thickness samples of the target part are input into the finite element analysis tool to achieve automated analysis. Since the sampling method using the geometric correlation characteristic is utilized during the sampling process, the number of target thickness samples is small. Therefore, the target stiffness analysis results of the target part can be obtained quickly, effectively accelerating the design speed.

[0097] S502: Using an acoustic simulation tool to perform NVH performance simulation analysis on a target thickness sample corresponding to a target part to obtain a target NVH analysis result.

[0098] Among them, the acoustic simulation tool, namely LMS virtual lab, refers to the vibration and noise simulation platform.

[0099] In this embodiment, the target thickness samples of the target parts are input into the acoustic simulation tool to realize automated analysis. Since the sampling method based on geometric correlation characteristics is used in the sampling process, the number of target thickness samples is small. Therefore, the target NVH analysis results of the target parts can be obtained quickly, which effectively speeds up the design.

[0100] S503: Using a display dynamic analysis tool to perform collision performance simulation analysis on a target thickness sample corresponding to the target part to obtain a target collision analysis result.

[0101] Among them, the display dynamic analysis tool, namely LS-DYNA, refers to a tool that mainly uses the Lagrange algorithm and also has the ALE and Euler algorithms. The display dynamic analysis tool mainly uses structural analysis and also has thermal analysis and fluid-structure coupling functions.

[0102] In this embodiment, the target thickness samples of the target part are input into the finite element analysis tool to realize automated analysis. Since the sampling method based on geometric correlation characteristics is used in the sampling process, the number of target thickness samples is small. Therefore, the target stiffness analysis results of the target part can be quickly obtained, which effectively speeds up the design process.

[0103] S504: Based on the target stiffness analysis result, the target NVH analysis result and the target collision analysis result, a target simulation result corresponding to the target part is obtained.

[0104] In this embodiment, the same target thickness sample is respectively input into the finite element analysis tool, the acoustic simulation tool and the display dynamic analysis tool to realize automated analysis and obtain the target stiffness analysis results, the target NVH analysis results and the target collision analysis results; according to the simulation result requirements, the automatic extraction program is used to perform data extraction and processing on the target stiffness analysis results, the target NVH analysis results and the target collision analysis results to obtain the target simulation results corresponding to the target parts.

[0105] The body structure design method provided in this embodiment uses a finite element analysis tool to perform a stiffness performance simulation analysis on the target thickness samples corresponding to the target parts to obtain the target stiffness analysis results; uses an acoustic simulation tool to perform an NVH performance simulation analysis on the target thickness samples corresponding to the target parts to obtain the target NVH analysis results; uses an explicit dynamic analysis tool to perform a collision performance simulation analysis on the target thickness samples corresponding to the target parts to obtain the target collision analysis results; uses an analysis tool for automated analysis. Since the number of target thickness samples is small, the target NVH analysis results of the target parts can be obtained quickly, effectively accelerating the design speed.

[0106] As an embodiment, as Figure 6 shown, step S106, that is, based on the simulation response surface corresponding to the target parts, obtaining the target optimal body solution that meets the simulation performance constraint conditions, includes:

[0107] S601: Based on the simulation response surface corresponding to the target parts, obtain the initial optimal body solution that meets the simulation performance constraint conditions, and determine whether the initial optimal body solution meets the target accuracy requirements.

[0108] S602: If the initial optimal body solution meets the target accuracy requirements, then determine the initial optimal body solution as the target optimal body solution.

[0109] Among them, the initial optimal body solution is the body solution that meets the simulation performance constraint conditions.

[0110] The target accuracy requirements are the requirements for verifying the accuracy of the initial optimal body solution. The target accuracy requirements can be the accuracy requirements for the response surface corresponding to the initial optimal body solution, or the accuracy requirements for the thickness of the target parts in the initial optimal body solution, which are not limited here.

[0111] In this embodiment, based on the simulation response surface corresponding to the target parts, the initial optimal body solution is obtained; to ensure that the initial optimal body solution can meet the target accuracy requirements, the accuracy of the initial optimal body solution also needs to be verified. When the initial optimal body solution meets the target accuracy requirements, the target optimal body solution can be obtained, which can ensure that the obtained target optimal body solution has a high accuracy and meets the development goals.

[0112] The body structure design method provided in this embodiment, based on the simulation response surface corresponding to the target parts, obtains the initial optimal body solution that meets the simulation performance constraint conditions. When the initial optimal body solution meets the target accuracy requirements, the initial optimal body solution is determined as the target optimal body solution, which can ensure that the obtained target optimal body solution has a high accuracy and meets the development goals.

[0113] As an embodiment, as Figure 7As shown in the figure, step S601, that is, based on the simulation response surface corresponding to the target part, obtaining the initial optimal body solution that meets the simulation performance constraint conditions, includes:

[0114] S701: Obtain the simulation Pareto boundary of the simulation response surface and the benchmark Pareto boundary of the benchmark response surface.

[0115] Among them, the simulation Pareto boundary refers to the optimal solution corresponding to the target performance of the simulation response surface, that is, in the simulation response surface, the solution that makes the stiffness performance, NVH performance, and collision performance reach the optimal.

[0116] Similarly, the benchmark Pareto boundary refers to the optimal solution corresponding to the target performance of the benchmark response surface, that is, in the benchmark response surface, the solution that makes the stiffness performance, NVH performance, and collision performance reach the optimal. Among them, the benchmark response surface is the response surface obtained according to the benchmark thickness value of the target part.

[0117] In this embodiment, after obtaining the simulation response interface, a drawing tool is used to draw the boundary of the simulation response interface to obtain the simulation Pareto boundary. Similarly, after obtaining the benchmark response interface, a drawing tool is used to draw the boundary of the benchmark response interface to obtain the benchmark Pareto boundary, which can realize automatically obtaining the simulation Pareto boundary and the benchmark Pareto boundary, accelerating the design speed and improving the automation degree.

[0118] S702: Compare the differences between the simulation Pareto boundary and the benchmark Pareto boundary to generate a correction function.

[0119] Among them, the correction function is a function used to correct the benchmark Pareto boundary.

[0120] In this embodiment, since there are many difference points between the benchmark Pareto boundary including multiple performances and the simulation Pareto boundary, it is difficult to directly process to obtain the target simulation value. In this embodiment, by comparing the differences between the simulation Pareto boundary and the benchmark Pareto boundary to generate a correction function, it provides technical support for generating the target simulation value subsequently.

[0121] S703: Process the benchmark Pareto boundary using the correction function to obtain the target simulation value that meets the performance constraint conditions.

[0122] Among them, the target simulation value refers to the optimal thickness value corresponding to the target part that constitutes the body. In this embodiment, the benchmark Pareto boundary is corrected using the correction function to ensure that the subsequently generated target simulation value is better.

[0123] S704: Conduct simulation verification on the target simulation value to generate the initial optimal body solution.

[0124] In this embodiment, the target simulation value is input into the simulation tool to obtain the initial optimal solution of the vehicle body.

[0125] The vehicle body structure design method provided in this embodiment can obtain the simulation Pareto boundary of the simulation response surface and the reference Pareto boundary of the reference response surface, which can automatically obtain the simulation Pareto boundary and the reference Pareto boundary, speed up the design speed, and improve the degree of automation. By comparing the differences between the simulation Pareto boundary and the reference Pareto boundary, a correction function is generated to provide technical support for generating the target simulation value later. The reference Pareto boundary is processed using the correction function to obtain the target simulation value pair that meets the performance constraint conditions. The target simulation value is verified by simulation to generate the initial optimal solution of the vehicle body to ensure that the subsequent generated target simulation value is better.

[0126] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not imply the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0127] In one embodiment, a vehicle body structure design device is provided, and the vehicle body structure design device corresponds one-to-one with the vehicle body structure design method in the above embodiment. As Figure 8 shown, the vehicle body structure design device includes a simulation performance constraint condition acquisition module 801, a target part acquisition module 802, a target thickness sample acquisition module 803, a target simulation result acquisition module 804, a simulation response surface acquisition module 805, and a target optimal vehicle body solution acquisition module 806. The detailed descriptions of each functional module are as follows:

[0128] The simulation performance constraint condition acquisition module 801 is used to acquire the simulation performance constraint conditions corresponding to the target performance, and the target performance includes stiffness performance, NVH performance, and collision performance.

[0129] The target part acquisition module 802 is used to screen the vehicle body force transmission path parts based on the stiffness performance, NVH performance, and collision performance to acquire the target parts.

[0130] The target thickness sample acquisition module 803 is used to acquire the reference thickness value of the target part, and based on the reference thickness value, perform thickness sampling processing on the target part to acquire the target thickness sample corresponding to the target part.

[0131] The target simulation result acquisition module 804 is used to perform multidisciplinary performance simulation tests on the target thickness sample corresponding to the target part to acquire the target simulation result corresponding to the target part.

[0132] The simulation response surface acquisition module 805 is used to construct the simulation response surface corresponding to the target part based on the target simulation result corresponding to the target part.

[0133] The target optimal body solution acquisition module 806 is configured to obtain a target optimal body solution that meets the simulation performance constraint conditions based on the simulation response surface corresponding to the target part.

[0134] Preferably, the target part acquisition module 802 includes: a first part acquisition unit, a second part acquisition unit, and a third part acquisition unit.

[0135] The first part acquisition unit is configured to perform a stiffness performance test on all body force transmission path parts, obtain the stiffness correlation corresponding to each body force transmission path part, and determine the body force transmission path parts whose stiffness correlation meets the stiffness performance threshold as the first parts.

[0136] The second part acquisition unit is configured to perform an NVH performance test on all body force transmission path parts, obtain the NVH correlation corresponding to each body force transmission path part, and determine the body force transmission path parts whose NVH correlation meets the NVH performance threshold as the second parts.

[0137] The third part acquisition unit is configured to perform a collision performance test on all body force transmission path parts, obtain the collision correlation corresponding to each body force transmission path part, and determine the body force transmission path parts whose collision correlation meets the collision performance threshold as the third parts.

[0138] The target parts include the first parts, the second parts, and the third parts.

[0139] Preferably, the target thickness sample acquisition module 803 includes: an initial thickness value acquisition unit, a true thickness value acquisition unit, and a moment judgment unit.

[0140] The initial thickness value acquisition unit is configured to obtain the initial thickness value of the target part, and determine the initial moment of inertia and the initial fully plastic section moment of the target part based on the initial thickness value.

[0141] The true thickness value acquisition unit is configured to obtain the true thickness value of the benchmark vehicle model, and determine the true moment of inertia and the true fully plastic section moment corresponding to the target part based on the true thickness value.

[0142] The moment judgment unit is configured to, when the initial moment of inertia is greater than the true moment of inertia and the initial fully plastic section moment is greater than the true fully plastic section moment, determine the initial thickness value as the reference thickness value.

[0143] Preferably, the target thickness sample acquisition module 803 includes: a to-be-processed thickness value acquisition unit, a thickness sub-layer acquisition unit, and a target thickness sample acquisition unit.

[0144] A thickness value to be processed obtaining unit, configured to obtain a standard thickness range corresponding to a target part based on a reference thickness value, and obtain N thickness values to be processed within the standard thickness range of the target part.

[0145] A thickness sub-layer obtaining unit, configured to perform a layering process on the N thickness values to be processed, and obtain M thickness sub-layers, where 1 ≤ M < N.

[0146] A target thickness sample obtaining unit, configured to sample each thickness sub-layer, and obtain M target thickness samples corresponding to the target part.

[0147] Preferably, the target simulation result obtaining module 804 includes: a stiffness analysis unit, an NVH analysis unit, a collision analysis unit, and a target simulation result obtaining unit.

[0148] The stiffness analysis unit is configured to perform a stiffness performance simulation analysis on the target thickness samples corresponding to the target part by using a finite element analysis tool, and obtain a target stiffness analysis result.

[0149] The NVH analysis unit is configured to perform an NVH performance simulation analysis on the target thickness samples corresponding to the target part by using an acoustic simulation tool, and obtain a target NVH analysis result.

[0150] The collision analysis unit is configured to perform a collision performance simulation analysis on the target thickness samples corresponding to the target part by using an explicit dynamic analysis tool, and obtain a target collision analysis result.

[0151] The target simulation result obtaining unit is configured to obtain a target simulation result corresponding to the target part based on the target stiffness analysis result, the target NVH analysis result, and the target collision analysis result.

[0152] Preferably, the target optimal vehicle body solution obtaining module 806 includes: an initial optimal vehicle body solution obtaining unit and a target optimal vehicle body solution obtaining unit.

[0153] The initial optimal vehicle body solution obtaining unit is configured to obtain an initial optimal vehicle body solution that satisfies the simulation performance constraint conditions based on the simulation response surface corresponding to the target part, and determine whether the initial optimal vehicle body solution satisfies the target accuracy requirement.

[0154] The target optimal vehicle body solution obtaining unit is configured to, if the initial optimal vehicle body solution satisfies the target accuracy requirement, determine the initial optimal vehicle body solution as the target optimal vehicle body solution.

[0155] Preferably, the initial optimal vehicle body solution obtaining unit includes: a boundary obtaining unit, a difference comparison unit, a target simulation value obtaining unit, and a simulation verification unit.

[0156] The boundary obtaining unit is configured to obtain the simulation Pareto boundary of the simulation response surface and the reference Pareto boundary of the reference response surface.

[0157] A difference comparison unit is configured to perform a difference comparison between the simulated Pareto boundary and the reference Pareto boundary to generate a correction function.

[0158] A target simulation value acquisition unit is configured to process the reference Pareto boundary by using the correction function to obtain a target simulation value that meets the performance constraint conditions.

[0159] A simulation verification unit is configured to perform a simulation verification on the target simulation value to generate an initial optimal body solution.

[0160] For the specific limitations of the vehicle body structure design device, reference may be made to the limitations on the vehicle body structure design method in the foregoing text, which will not be elaborated here. Each module in the above vehicle body structure design device can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above modules.

[0161] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps of the vehicle body structure design method in the above embodiment are implemented, such as Figure 1 the steps S101 - S106 shown, or Figures 1 to 7 the steps shown in, for the sake of avoiding repetition, will not be elaborated here. Or, when the processor executes the computer program, the functions of each module / unit in this embodiment of the vehicle body structure design device are implemented, such as Figure 8 the functions of the simulation performance constraint condition acquisition module 801, the target part acquisition module 802, the target thickness sample acquisition module 803, the target simulation result acquisition module 804, the simulation response surface acquisition module 805, and the target optimal vehicle body solution acquisition module 806 shown, for the sake of avoiding repetition, will not be elaborated here.

[0162] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0163] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

[0164] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A vehicle body structure design method, characterized in that Including: Obtain the simulation performance constraint conditions corresponding to the target performance, where the target performance includes stiffness performance, NVH performance, and collision performance; Based on the stiffness performance, the NVH performance, and the collision performance, screen the body force transmission path parts to obtain target parts; Obtain the initial thickness value of the target part, and based on the initial thickness value, determine the initial moment of inertia and the initial fully plastic section moment of the target part; Obtain the true thickness value of the benchmark vehicle model, and based on the true thickness value, determine the true moment of inertia and the true fully plastic section moment corresponding to the target part; When the initial moment of inertia is greater than the true moment of inertia and the initial fully plastic section moment is greater than the true fully plastic section moment, determine the initial thickness value as the reference thickness value, and based on the reference thickness value, perform thickness sampling on the target part to obtain the target thickness sample corresponding to the target part; Perform performance simulation tests on the target thickness sample corresponding to the target part to obtain the target simulation result corresponding to the target part; Based on the target simulation result corresponding to the target part, construct the simulation response surface corresponding to the target part; Based on the simulation response surface corresponding to the target part, obtain the target optimal body solution that meets the simulation performance constraint conditions.

2. The vehicle body structure design method according to claim 1, characterized in that The screening of the body force transmission path parts based on the stiffness performance, the NVH performance, and the collision performance to obtain target parts includes: Perform stiffness performance tests on all body force transmission path parts to obtain the stiffness correlation corresponding to each body force transmission path part, and determine the first parts as the body force transmission path parts whose stiffness correlation meets the stiffness performance threshold; Perform NVH performance tests on all body force transmission path parts to obtain the NVH correlation corresponding to each body force transmission path part, and determine the second parts as the body force transmission path parts whose NVH correlation meets the NVH performance threshold; Perform collision performance tests on all body force transmission path parts to obtain the collision correlation corresponding to each body force transmission path part, and determine the third parts as the body force transmission path parts whose collision correlation meets the collision performance threshold; The target parts include the first parts, the second parts, and the third parts.

3. The vehicle body structure design method according to claim 1, wherein The performing thickness sampling on the target part based on the reference thickness value to obtain the target thickness sample corresponding to the target part includes: Based on the reference thickness value, obtain the standard thickness range corresponding to the target part, and obtain N to-be-processed thickness values of the target part within the standard thickness range; Perform hierarchical processing on the N to-be-processed thickness values to obtain M thickness sub-layers, where 1 ≤ M < N; Sample each thickness sub-layer to obtain M target thickness samples corresponding to the target part.

4. The vehicle body structure design method according to claim 1, characterized in that, The performing performance simulation tests on the target thickness sample corresponding to the target part to obtain the target simulation result corresponding to the target part includes: Use a finite element analysis tool to perform stiffness performance simulation analysis on the target thickness sample corresponding to the target part to obtain the target stiffness analysis result; Perform NVH performance simulation analysis on the target thickness samples corresponding to the target parts using an acoustic simulation tool to obtain target NVH analysis results; Perform collision performance simulation analysis on the target thickness samples corresponding to the target parts using a dynamic display analysis tool to obtain target collision analysis results; Based on the target stiffness analysis results, the target NVH analysis results, and the target collision analysis results, obtain the target simulation results corresponding to the target parts.

5. The vehicle body structure design method according to claim 1, characterized in that The obtaining of the target optimal vehicle body solution that meets the simulation performance constraint conditions based on the simulation response surface corresponding to the target parts includes: Based on the simulation response surface corresponding to the target parts, obtain an initial optimal vehicle body solution that meets the simulation performance constraint conditions, and determine whether the initial optimal vehicle body solution meets the target accuracy requirements; If the initial optimal vehicle body solution meets the target accuracy requirements, then determine the initial optimal vehicle body solution as the target optimal vehicle body solution.

6. The vehicle body structure design method according to claim 5, characterized in that The obtaining of the initial optimal vehicle body solution that meets the simulation performance constraint conditions based on the simulation response surface corresponding to the target parts includes: Obtain the simulation Pareto boundary of the simulation response surface and the reference Pareto boundary of the reference response surface; Perform a difference comparison between the simulation Pareto boundary and the reference Pareto boundary to generate a correction function; Use the correction function to process the reference Pareto boundary to obtain target simulation values that meet the performance constraint conditions; Perform simulation verification on the target simulation values to generate an initial optimal solution for the vehicle body.

7. A vehicle body structure design device, characterized in that, Includes: A simulation performance constraint condition acquisition module for acquiring simulation performance constraint conditions corresponding to target performance, where the target performance includes stiffness performance, NVH performance, and collision performance; A target part acquisition module for screening vehicle body force transmission path parts based on the stiffness performance, the NVH performance, and the collision performance to obtain target parts; A target thickness sample acquisition module for obtaining the initial thickness value of the target parts, and determining the initial moment of inertia and the initial fully plastic section moment of the target parts based on the initial thickness value; Obtain the true thickness value of the benchmark vehicle model, and determine the true moment of inertia and the true fully plastic section moment corresponding to the target parts based on the true thickness value; When the initial moment of inertia is greater than the true moment of inertia and the initial fully plastic section moment is greater than the true fully plastic section moment, then determine the initial thickness value as the benchmark thickness value, and based on the benchmark thickness value, perform thickness sampling processing on the target parts to obtain the target thickness samples corresponding to the target parts; A target simulation result acquisition module for performing performance simulation tests on the target thickness samples corresponding to the target parts to obtain the target simulation results corresponding to the target parts; A simulation response surface acquisition module for constructing a simulation response surface corresponding to the target parts based on the target simulation results corresponding to the target parts; A target optimal vehicle body solution acquisition module for obtaining a target optimal vehicle body solution that meets the simulation performance constraint conditions based on the simulation response surface corresponding to the target parts.

8. A computer device, 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, it implements the steps of the vehicle body structure design method according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the vehicle body structure design method according to any one of claims 1 to 6.

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