Vehicle body structure design method and device, computer equipment and storage medium

Abstract

The invention relates to the field of vehicle design, in particular to a vehicle body structure design method and device, computer equipment and a storage medium, and the method comprises the steps: constructing an initial vehicle simulation model; performing collision simulation analysis on the initial vehicle simulation model according to collision data corresponding to a preset collision working condition to obtain an initial simulation result; determining a target structure variable corresponding to a preset collision working condition according to the initial simulation result; performing transformation processing on the target structure variable according to a preset zoom coefficient range and an internal energy absorption amount increase proportion and a section force increase proportion corresponding to the target collision speed to obtain multiple groups of variable data; constructing a simulation sample library comprising a plurality of whole vehicle simulation model samples; and performing simulation analysis on each whole vehicle simulation model sample to obtain an optimal structure parameter corresponding to the target collision speed. According to the method, the optimal structure parameters can be quickly and accurately determined, and the vehicle body structure design efficiency is improved.

Description

Technical Field

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

[0002] With the continuous upgrading of traffic safety collision regulations, the collision speed of collision tests has also increased (for example, upgrading the full frontal collision test speed from 50 km / h to 56 km / h). Therefore, the structural parameters of vehicle body structure components related to collisions should also be adjusted accordingly. However, in related technologies, after the traffic safety collision regulations are upgraded and the collision test speed increases, the structural parameters of the vehicle are often manually adjusted relying on the experience of engineers; thus, the workload is large, the optimization cycle of the vehicle structure is long, and there is also a problem of low efficiency in designing the vehicle body structure. Summary of the Invention

[0003] Based on this, it is necessary to provide a method and device for designing a vehicle body structure, a computer device, and a storage medium for the above technical problems, so as to solve the problems such as low efficiency in designing the vehicle body structure caused by manually adjusting the structural parameters relying on the experience of engineers in the prior art.

[0004] A method for designing a vehicle body structure includes:

[0005] Constructing an initial vehicle simulation model according to the initial force transmission path information and initial structural performance indicators of a basic vehicle model;

[0006] Performing a collision simulation analysis on the initial vehicle simulation model according to collision data corresponding to a preset collision condition to obtain an initial simulation result including internal energy absorption data and sectional force data;

[0007] Determining a target structural variable corresponding to the preset collision condition according to the internal energy absorption data and the sectional force data;

[0008] Performing a transformation process on the target structural variable according to a preset scaling coefficient range, an internal energy absorption increase ratio, and a sectional force increase ratio corresponding to a target collision speed to obtain multiple sets of variable data;

[0009] Constructing a simulation sample library including multiple vehicle simulation model samples, and each vehicle simulation model sample is reconstructed from the initial vehicle simulation model according to a set of the variable data;

[0010] Performing a simulation analysis on each of the vehicle simulation model samples to obtain optimal structural parameters corresponding to the target collision speed.

[0011] A device for designing a vehicle body structure includes:

[0012] An initial vehicle simulation model construction module, configured to construct an initial vehicle simulation model according to the initial force transmission path information and initial structural performance indicators of a basic vehicle model;

[0013] A collision simulation analysis module, configured to perform a collision simulation analysis on the initial vehicle simulation model according to collision data corresponding to a preset collision condition, and obtain an initial simulation result including internal energy absorption data and cross-sectional force data;

[0014] A target structure variable determination module, configured to determine a target structure variable corresponding to the preset collision condition according to the internal energy absorption data and the cross-sectional force data;

[0015] A multi-group variable data acquisition module, configured to perform transformation processing on the target structure variable according to a preset scaling coefficient range and an internal energy absorption increase ratio and a cross-sectional force increase ratio corresponding to a target collision speed, and obtain multi-group variable data;

[0016] A simulation sample library construction module, configured to construct a simulation sample library including multiple vehicle whole-body simulation model samples, and each vehicle whole-body simulation model sample is reconstructed from the initial vehicle simulation model according to a group of the variable data;

[0017] An optimal structure parameter determination module, configured to perform a simulation analysis on each of the vehicle whole-body simulation model samples, and obtain an optimal structure parameter corresponding to the target collision speed.

[0018] A computer device, including a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, wherein when the processor executes the computer-readable instructions, the above-mentioned vehicle body structure design method is implemented.

[0019] One or more readable storage media storing computer-readable instructions, wherein when the computer-readable instructions are executed by one or more processors, the one or more processors are caused to execute the vehicle body structure design method as described above.

[0020] The above-mentioned vehicle body structure design method, device, computer equipment and storage medium construct an initial vehicle simulation model according to the initial force transmission path information and initial structural performance indexes of the basic vehicle model; perform a collision simulation analysis on the initial vehicle simulation model according to the collision data corresponding to the preset collision conditions to obtain an initial simulation result including internal energy absorption data and sectional force data; determine the target structural variables corresponding to the preset collision conditions according to the internal energy absorption data and the sectional force data; perform a transformation process on the target structural variables according to the preset scaling coefficient range, the internal energy absorption increase ratio and the sectional force increase ratio corresponding to the target collision speed to obtain multiple groups of variable data; construct a simulation sample library including multiple vehicle whole-body simulation model samples, and each vehicle whole-body simulation model sample is reconstructed from the initial vehicle simulation model according to a group of the variable data; perform a simulation analysis on each of the vehicle whole-body simulation model samples to obtain the optimal structural parameters corresponding to the target collision speed.

[0021] Based on the initial vehicle simulation model, the present invention performs a collision simulation analysis under preset collision conditions to obtain an initial simulation result, determines target structural variables based on the initial simulation result, and further constructs a simulation sample library based on the target structural variables and the preset scaling coefficient range to solve for the optimal structural parameters. It can automatically and accurately determine the optimal structural parameters without relying on the experience of engineers for manual adjustment, effectively saving manpower and material resources and reducing the degree of dependence on empirical judgment. Moreover, the process of determining the optimal structural parameters is simple and fast, shortening the optimization cycle of the vehicle structure, improving the efficiency of vehicle body structure design, and maximizing the realization of the structural lightweight design of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings 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.

[0023] Figure 1 It is a flowchart of a vehicle body structure design method in an embodiment of the present invention;

[0024] Figure 2 It is a structural diagram of a vehicle body structure design device in an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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 of 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.

[0027] In one embodiment, as Figure 1 shown, a vehicle body structure design method is provided. Taking the application of this method in the Figure 1 server as an example for illustration, it includes the following steps:

[0028] S10. Construct an initial vehicle simulation model according to the initial force transmission path information and initial structural performance indicators of the basic vehicle model.

[0029] It can be understood that the basic vehicle model refers to a vehicle model that conforms to the initial traffic safety collision regulations before the upgrade of the traffic safety collision regulations. For example, after the upgrade of the traffic safety collision regulations, the full frontal collision test speed needs to be upgraded from 50 km / h to 56 km / h. At this time, the basic vehicle model is a vehicle model that meets the collision requirements before the upgrade of the traffic safety collision regulations (such as the vehicle model that meets the collision requirements of the full frontal collision test speed of 50 km / h). And in the present invention, it is necessary to determine the optimal structural parameters of a vehicle that can meet the collision requirements after the upgrade of the traffic safety collision regulations (such as the collision requirements of the full frontal collision test speed of 56 km / h) through this vehicle body structure design method. The initial force transmission path information refers to the force transmission path information of the basic vehicle model when it is collided. The initial force transmission path information includes, but is not limited to, the relevant information of the force transmission paths corresponding to various azimuth collision tests such as frontal collision, side collision, and rear collision of the basic vehicle model. For example, the initial force transmission path information includes multiple vehicle body structure components used to construct the force transmission path corresponding to the preset collision condition. The above force transmission paths will be determined according to the specific vehicle model during the collision test. For example, the force transmission path corresponding to the frontal collision can be: from the front bumper beam to the energy absorption box, to the front longitudinal beam and the reinforcement plate, to the floor longitudinal beam, the upper short beam, to the subframe, to the front bulkhead cross member, to the front bulkhead, to the center tunnel, etc. The initial structural performance indicators refer to various structural performance indicators such as the thickness, strength, and size of the vehicle body structure components of the basic vehicle model.

[0030] S20. Perform a collision simulation analysis on the initial vehicle simulation model according to the collision data corresponding to the preset collision condition, and obtain an initial simulation result including the internal energy absorption data and the cross-sectional force data.

[0031] Understandably, the preset collision condition refers to the condition for conducting a collision test preset according to the upgraded traffic safety collision regulations after the upgrade of the traffic safety collision regulations. Among them, the preset collision conditions include, but are not limited to, the frontal collision condition, side collision condition, rear collision condition, etc. corresponding to the collision test after the upgrade of the traffic safety collision regulations. The collision data includes the collision speed, collision direction, collision distance, etc. corresponding to the collision test under the preset collision condition after the upgrade of the traffic safety collision regulations. For example, when the preset collision condition is the frontal collision condition, the collision speed included in the collision data can be the full frontal collision test speed of 56 km / h after the upgrade of the traffic safety collision regulations. A set of collision data corresponding to the upgraded traffic safety collision regulations is preset and stored for each preset collision condition, and can be directly retrieved and used when determining the preset collision condition. Collision simulation analysis refers to the process of using the initial vehicle simulation model and collision data to simulate and analyze the scene of a collision test under the preset collision condition after the upgrade of the traffic safety collision regulations, and then obtaining the initial simulation result including the internal energy absorption data and cross-sectional force data. Among them, the internal energy absorption data in the initial simulation result includes the internal energy absorption of each vehicle body structure component in the force transmission path corresponding to the preset collision condition under the preset collision condition; specifically, the internal energy absorption data includes the internal energy absorption of at least one vehicle body structure component in the force transmission path corresponding to the preset collision condition, and the internal energy absorption refers to the collision energy that the vehicle body structure component can bear and absorb. The cross-sectional force data in the initial simulation result includes the cross-sectional forces borne by each vehicle body structure component in the force transmission path under the preset collision condition. Specifically, the cross-sectional force data includes the perpendicular collision forces received by at least one vehicle body structure component in the cross-section in the force transmission path corresponding to the preset collision condition.

[0032] S30. Determine the target structural variables corresponding to the preset collision condition according to the internal energy absorption data and the cross-sectional force data.

[0033] Understandably, the target structural variables refer to the structural performance indicators such as the thickness, strength, and angle of the vehicle body structure components determined according to the internal energy absorption data and the cross-sectional force data.

[0034] In one embodiment, the initial force transmission path information includes multiple vehicle body structure components used to construct the force transmission path corresponding to the preset collision condition; the internal energy absorption data includes the internal energy absorption of each vehicle body structure component in the force transmission path under the preset collision condition; the cross-sectional force data includes the cross-sectional forces borne by each vehicle body structure component in the force transmission path under the preset collision condition.

[0035] In one embodiment, step S30, that is, determining a target structural variable corresponding to the preset collision condition according to the internal energy absorption data and the cross-sectional force data, includes:

[0036] S301. Determine a target absorption amount from all the internal energy absorption amounts according to a preset internal energy ratio index; Understandably, the preset internal energy ratio index refers to a preset internal energy ratio index. Among them, the internal energy ratio index can be a range or a definite value, and no limitation is made here. Among them, the internal energy ratio refers to the ratio of the internal energy absorption amount of the vehicle body structural component to the collision force under the preset collision condition. For example, the preset internal energy ratio index can be 80%. Understandably, when the preset internal energy ratio index is 80%, the internal energy absorption amount with an internal energy ratio equal to the preset internal energy ratio index (80%) among all the internal energy absorption amounts is determined as the target absorption amount, or the internal energy absorption amount with an internal energy ratio equal to the preset internal energy ratio index minus a preset value (such as 10%, that is, an internal energy ratio of 70%) among all the internal energy absorption amounts can also be determined as the target absorption amount, etc.

[0037] S302. Determine the maximum value among all the cross-sectional forces as the target cross-sectional force;

[0038] S303. Determine at least one of the target structural variables from a preset number of structural variables according to the target absorption amount and the target cross-sectional force.

[0039] In this embodiment, the preset number refers to the number of selectable structural variables preset for the preset collision condition. The structural variables include structural performance indexes such as the strength, angle, thickness, and size of the vehicle body structural component. For example, if the preset number is 4, the number of selectable structural variables corresponding to the preset collision condition is four, and these four structural variables can be four of the multiple structural performance indexes such as the strength, angle, thickness, and size of the vehicle body structural component. Preferably, the internal energy ratio index is positively correlated with the number of target structural variables, that is, the higher the internal energy ratio index, the more the number of target structural variables determined from the preset number of structural variables. The target absorption amount refers to the absorption amount of the vehicle body structural component absorbing collision energy determined according to the preset internal energy ratio index. In this embodiment, determining the target structural variable through the target absorption amount and the target structural variable makes the determined target structural variable more in line with the actual requirements.

[0040] In one embodiment, step S303, that is, determining at least one of the target structural variables from a preset number of structural variables according to the target absorption amount and the target cross-sectional force, includes:

[0041] S3031. Obtain a quantity variable index corresponding to the target absorption amount and a type variable index corresponding to the target cross-sectional force;

[0042] S3032. Determine at least one of the target structure variables from a preset number of structure variables according to the quantity variable index and the type variable index.

[0043] Understandably, the quantity variable index refers to the variable index corresponding to the target absorption amount, and this variable index can be used to determine the quantity of the target structure variables selected from a preset number of structure variables. The type variable index refers to the variable index corresponding to the target sectional force, and this variable index can be used to determine the type of the target structure variables selected from a preset number of structure variables. For example, if the preset number of structure variables includes four aspects: the strength, angle, thickness, and size of the vehicle body structure components, and at this time, if the quantity variable index is 2, and the type variable index is the angle and the thickness, then the target structure variables can be determined to be the two structure variables of the angle and the thickness.

[0044] In this embodiment, the target structure variables are determined through different variable indexes, so that the determination of the target structure variables comprehensively considers two aspects of the target absorption amount and the target sectional force, thereby making the determination of the target structure variables more accurate.

[0045] S40. Perform transformation processing on the target structure variables according to the preset scaling factor range, the increased proportion of the internal energy absorption amount corresponding to the target collision speed, and the increased proportion of the sectional force, to obtain multiple sets of variable data.

[0046] Understandably, the preset scaling factor range refers to the range of available values of the pre-set proportional scaling factor. For example, the preset scaling factor range can be 0.8 - 1.2. Among them, the proportional scaling factor refers to the scaling factor corresponding to the increase ratio of the internal energy absorption amount and the increase ratio of the sectional force. That is to say, the increase ratio of the internal energy absorption amount and the increase ratio of the sectional force can be magnified or reduced according to the above proportional scaling factor (for example, multiplying by the proportional scaling factor to achieve scaling). Among them, the increase ratio of the internal energy absorption amount refers to the ratio of the increase in the internal energy absorption amount caused by the upgrade of the vehicle's collision speed after the upgrade of the traffic safety collision regulations. The increase ratio of the sectional force refers to the ratio of the increase in the sectional force caused by the upgrade of the vehicle's collision speed after the upgrade of the traffic safety collision regulations. The target collision speed refers to the collision speed determined in the upgraded traffic safety collision regulations. For example, after the upgrade of the traffic safety collision regulations, the full frontal collision test speed for the collision test needs to be upgraded from 50 km / h to 56 km / h. The increase ratio of the internal energy absorption amount refers to the ratio of the increase in the internal energy absorption amount when the full frontal collision test speed of the vehicle is upgraded from 50 km / h to 56 km / h. The increase ratio of the sectional force refers to the ratio of the increase in the sectional force when the full frontal collision test speed of the vehicle is upgraded from 50 km / h to 56 km / h. The target collision speed can be 56 km / h. Among them, the above increase ratio of the internal energy absorption amount and the increase ratio of the sectional force can be obtained by simulating and analyzing the above initial vehicle simulation model under the preset collision conditions before and after the upgrade of the traffic safety collision regulations respectively.

[0047] In this step, the process of performing transformation processing on the target structure variable to obtain multiple sets of variable data is as follows: First, multiple points are taken from the preset scaling factor range to obtain multiple proportional scaling factors. Then, after scaling the increase ratio of the internal energy absorption amount and the increase ratio of the sectional force respectively according to the same proportional scaling factor, a set of target absorption amount ratios and target sectional ratios can be obtained. Furthermore, according to this set of target absorption amount ratios and target sectional ratios, transformation processing is performed on the target structure variable, and a set of variable data can be obtained. Therefore, multiple sets of variable data can be obtained according to multiple proportional scaling factors.

[0048] In one embodiment, step S40, that is, performing transformation processing on the target structure variable according to the preset scaling factor range and the increase ratio of the internal energy absorption amount and the increase ratio of the sectional force corresponding to the target collision speed to obtain multiple sets of variable data, includes:

[0049] S401. Sample from the preset scaling coefficient range based on the Latin hypercube design method to obtain multiple scaling coefficients. Understandably, the Latin hypercube method is a statistical method for designing experimental schemes. This method assigns experimental factors to different treatment combinations to determine which factors have a significant impact on the experimental results, thereby achieving the purpose of optimal experimental design and data analysis. In this step, multiple scaling coefficients can be obtained by taking multiple values from the preset scaling coefficient range based on the Latin hypercube design method.

[0050] S402. Scale the increased proportion of internal energy absorption and the increased proportion of sectional force according to each of the scaling coefficients to obtain a target absorption proportion and a target sectional proportion corresponding to the scaling coefficient. That is, after scaling the increased proportion of internal energy absorption and the increased proportion of sectional force respectively according to the same scaling coefficient, a set of target absorption proportions (the first product of the scaling coefficient and the increased proportion of internal energy absorption) and target sectional proportions (the second product of the scaling coefficient and the increased proportion of sectional force) corresponding to the scaling coefficient will be obtained. For example, if the scaling coefficient is 1.2, the increased proportion of internal energy absorption is a, and the increased proportion of sectional force is b; then the target absorption proportion (i.e., the first product) is 1.2a, and the target sectional proportion (i.e., the second product) is 1.2b.

[0051] S403. Perform a transformation process on the target structural variables according to the target absorption proportions and target sectional proportions corresponding to the scaling coefficients to obtain variable data corresponding to each of the scaling coefficients one by one. Among them, after obtaining the target absorption proportion and the target sectional proportion corresponding to a scaling coefficient, a set of variable data corresponding to the target absorption proportion and the target sectional proportion needs to be obtained from the preset structure database. The preset structure database refers to a pre-established structure database, which includes variable data of each vehicle body structural component under different conditions of increased proportion of internal energy absorption (the target absorption proportion is also a proportion of increased internal energy absorption) and increased proportion of sectional force (the target sectional proportion is also a proportion of increased sectional force). For example, if the target absorption proportion (i.e., the first product) is 1.2a and the target sectional proportion (i.e., the second product) is 1.2b, at this time, look up the table in the structure database according to the above target absorption proportion and target sectional proportion (1.2a, 1.2b) to obtain the variable data corresponding to (1.2a, 1.2b).

[0052] In this embodiment, sampling in the preset scaling coefficient range by the Latin hypercube design method to obtain multiple scaling coefficients can improve the accuracy of the experiment; and scaling the increased proportion of internal energy absorption and the increased proportion of sectional force according to the scaling coefficients can increase the diversity of samples.

[0053] S50. Construct a simulation sample library including multiple vehicle simulation model samples, and each vehicle simulation model sample is reconstructed from the initial vehicle simulation model according to a set of the variable data. Understandably, in the present invention, multiple vehicle simulation model samples can be directly reconstructed from the initial vehicle simulation model according to each set of the variable data; alternatively, after simplifying the initial vehicle simulation model, multiple vehicle simulation model samples can be reconstructed from the simplified model according to each set of the variable data.

[0054] In one embodiment, that is, the constructing a simulation sample library including multiple vehicle simulation model samples includes:

[0055] S501. Simplify the initial vehicle simulation model to obtain a simplified model;

[0056] S502. Reconstruct the simplified model according to each set of the variable data to obtain a vehicle simulation model sample corresponding to this set of variable data;

[0057] S503. Generate the simulation sample library according to all the vehicle simulation model samples.

[0058] Understandably, the initial vehicle simulation model needs to input the structural performance indexes of each body structure component.

[0059] S60. Perform simulation analysis on each of the vehicle simulation model samples to obtain the optimal structural parameters corresponding to the target collision speed. Understandably, in the present invention, the vehicle can be designed according to the above optimal structural parameters, and the designed vehicle meets the collision requirements after the upgrade of the traffic safety collision regulations.

[0060] Understandably, before simplification, the initial vehicle simulation model needs to perform simulation analysis on the structural performance indexes of each body structure component of the vehicle to construct a vehicle simulation model, which involves a large amount of data and takes a long time. The simplified model simplifies each body structure component irrelevant to the preset collision condition and no longer performs simulation analysis on the structural performance indexes of each body structure component irrelevant to the preset collision condition, greatly reducing the data processing amount and shortening the data analysis time. The vehicle simulation model sample refers to the vehicle model reconstructed from the simplified model according to the variable data.

[0061] In one embodiment, the performing simulation analysis on each of the vehicle simulation model samples to obtain the optimal structural parameters corresponding to the target collision speed includes:

[0062] S601. Perform finite element simulation analysis on each of the vehicle simulation model samples respectively to obtain the response points corresponding to each of the vehicle simulation model samples;

[0063] S602. Perform a collision analysis on the response surface formed by each of the response points based on the target collision speed to obtain a target response point with the optimal collision performance and the collision response data corresponding to the target response point;

[0064] S603. Determine the collision response data as the optimal structural parameters corresponding to the target collision speed.

[0065] Herein, the finite element simulation analysis refers to simulating a real vehicle (geometry and load conditions) using a mathematical approximation method. The response point refers to the data point obtained by performing a finite element simulation analysis on the sample of the whole vehicle simulation model. The collision response data refers to the variable data corresponding to the response point. In this embodiment, the response points are determined through finite element simulation analysis, and the target response point is determined in the response surface constructed by each response point, so that the optimal structural parameters can be quickly determined, making the determined optimal structural parameters more accurate and improving the efficiency of body structure design.

[0066] In the above embodiments of the present invention, a collision simulation analysis is performed on the initial vehicle simulation model under a preset collision condition to obtain an initial simulation result, and a target structural variable is determined based on the initial simulation result. Then, a simulation sample library is constructed based on the target structural variable and the preset scaling coefficient range to solve for the optimal structural parameters. Without relying on the experience of engineers to manually adjust, the accurate determination of the optimal structural parameters can be automatically achieved, which can effectively save manpower and material resources and reduce the degree of dependence on empirical judgment. Moreover, the process of determining the optimal structural parameters in the above process is simple and fast, shortening the optimization cycle of the vehicle structure, improving the efficiency of body structure design, and also maximizing the realization of the structural lightweight design of the vehicle.

[0067] In a further embodiment, after determining the optimal structural parameters, it is also necessary to construct a whole vehicle simulation model based on the above optimal structural parameters, and then verify the whole vehicle simulation model to determine whether the optimal structural parameters meet the collision requirements after the upgrade of traffic safety collision regulations.

[0068] Furthermore, the above optimal structural parameters can be further processed by engineering optimization to obtain a vehicle that meets the engineering design requirements. Then, a vehicle simulation model can be constructed based on the above optimal structural parameters, and further verified to determine whether the optimal structural parameters meet the collision requirements after the upgrade of traffic safety collision regulations. Among them, the engineering optimization process may include: regularizing the thickness performance structure index in a preset unit. For example, regularizing it in units of 0.1 mm. For example, if the thickness performance structure index in the optimal structural parameters is 1.43 mm, then the thickness performance structure index is regularized to 1.4 mm. In addition, if the thickness corresponding to the thickness performance structure index in the optimal structural parameters does not meet the process material selection, for example, the thickness corresponding to the thickness performance structure index is 0.9 mm, and this thickness does not meet the process material selection at this time, it is also possible to consider upgrading the material and thinning its thickness, etc. (but it must meet the collision requirements after the upgrade of traffic safety collision regulations after verification).

[0069] In one embodiment, the preset collision conditions include a frontal collision condition, a side collision condition, and a rear collision condition; the initial force transmission path information includes a first vehicle body structure component for constructing a first force transmission path corresponding to the frontal collision, a second vehicle body structure component for constructing a second force transmission path corresponding to the side collision condition, and a third vehicle body structure component for constructing a third force transmission path corresponding to the rear collision condition. Understandably, the preset collision conditions may also include a small overlap collision condition, etc.; the initial force transmission path information may also include a fourth vehicle body structure component for constructing a fourth force transmission path corresponding to the small overlap collision condition, etc.

[0070] Understandably, the frontal collision condition refers to the condition where the front of the vehicle is collided. Similarly, the side collision condition refers to the condition where the side of the vehicle is collided, and the rear collision condition refers to the condition where the rear of the vehicle is collided. Different force transmission paths correspond to different vehicle body structure components. For example, the first force transmission path for the frontal collision condition is: from the front bumper beam to the energy absorption box, to the front longitudinal beam and the reinforcement plate, to the floor longitudinal beam, the upper short beam, to the subframe, to the front bulkhead cross beam, to the front bulkhead, to the center tunnel; then the first vehicle body structure components in the first force transmission path corresponding to the frontal collision condition are: the front bumper beam, the energy absorption box, the front longitudinal beam and the reinforcement plate, the floor longitudinal beam, the upper short beam, the subframe, the front bulkhead cross beam, the front bulkhead, and the center tunnel. The second force transmission path for the side collision is: from the inner and outer panels of the pillar to the sill, to the front and rear seat cross beams, to the roof cross beam; then the second vehicle body structure components in the second force transmission path corresponding to the side collision condition are: the inner and outer panels of the pillar to the sill, the front and rear seat cross beams, the roof cross beam. Other situations are not elaborated here.

[0071] It should be understood that the sequence numbers of the steps in the above embodiments do not indicate the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0072] In one embodiment, a vehicle body structure design device is provided, which corresponds to the vehicle body structure design method in the above embodiment one by one. As Figure 2 shown, the vehicle body structure design device includes an initial vehicle simulation model construction module 10, a collision simulation analysis module 20, a target structure variable determination module 30, a multi-group variable data acquisition module 40, a simulation sample library construction module 50, and an optimal structure parameter determination module 60. The detailed description of each functional module is as follows:

[0073] The initial vehicle simulation model construction module 10 is used to construct an initial vehicle simulation model according to the initial force transmission path information and initial structural performance indexes of the basic vehicle model;

[0074] The collision simulation analysis module 20 is used to perform collision simulation analysis on the initial vehicle simulation model according to the collision data corresponding to the preset collision condition, and obtain an initial simulation result including internal energy absorption data and cross-sectional force data;

[0075] The target structure variable determination module 30 is used to determine the target structure variable corresponding to the preset collision condition according to the internal energy absorption data and the cross-sectional force data;

[0076] The multi-group variable data acquisition module 40 is used to perform transformation processing on the target structure variable according to the preset scaling coefficient range and the internal energy absorption increase ratio and cross-sectional force increase ratio corresponding to the target collision speed, and obtain multi-group variable data;

[0077] The simulation sample library construction module 50 is used to construct a simulation sample library including multiple vehicle simulation model samples, and each vehicle simulation model sample is reconstructed from the initial vehicle simulation model according to a set of the variable data;

[0078] The optimal structure parameter determination module 60 is used to perform simulation analysis on each vehicle simulation model sample, and obtain the optimal structure parameter corresponding to the target collision speed.

[0079] In one embodiment, the initial force transmission path information includes multiple vehicle body structure components for constructing a force transmission path corresponding to the preset collision condition; the internal energy absorption data includes the internal energy absorption of each vehicle body structure component in the force transmission path under the preset collision condition; the cross-sectional force data includes the cross-sectional force borne by each vehicle body structure component in the force transmission path under the preset collision condition;

[0080] In one embodiment, the target structure variable determination module 30 includes:

[0081] A target absorption amount determination unit, configured to determine a target absorption amount from all the internal energy absorption amounts according to a preset internal energy ratio index;

[0082] A target sectional force determination unit, configured to determine the maximum value among all the sectional forces as the target sectional force;

[0083] A target structure variable determination unit, configured to determine at least one of the target structure variables from a preset number of structure variables according to the target absorption amount and the target sectional force.

[0084] In one embodiment, the target structure variable determination unit includes:

[0085] A variable index acquisition subunit, configured to acquire a quantity variable index corresponding to the target absorption amount and a type variable index corresponding to the target sectional force;

[0086] A target structure variable determination subunit, configured to determine at least one of the target structure variables from a preset number of structure variables according to the quantity variable index and the type variable index.

[0087] In one embodiment, the multi-group variable data acquisition module 40 includes:

[0088] A proportional scaling coefficient acquisition unit, configured to sample within the preset scaling coefficient range based on the Latin hypercube design method to obtain a plurality of proportional scaling coefficients;

[0089] A scaling unit, configured to scale the internal energy absorption amount increase ratio and the sectional force increase ratio according to each of the proportional scaling coefficients to obtain a target absorption amount ratio and a target sectional ratio corresponding to the proportional scaling coefficient;

[0090] A transformation unit, configured to perform a transformation process on the target structure variable according to the target absorption amount ratio and the target sectional ratio corresponding to each of the proportional scaling coefficients to obtain variable data corresponding to each of the proportional scaling coefficients one by one.

[0091] In one embodiment, the simulation sample library construction module 50 includes:

[0092] A simplified model acquisition unit, configured to simplify the initial vehicle simulation model to obtain a simplified model;

[0093] A vehicle simulation model sample acquisition unit, configured to reconstruct the simplified model according to each group of the variable data to obtain a vehicle simulation model sample corresponding to the group of variable data;

[0094] A simulation sample library generation unit, configured to generate the simulation sample library according to all the vehicle simulation model samples.

[0095] For the specific limitations of the vehicle body structure design device, reference can be made to the limitations of the vehicle body structure design method in the foregoing text, which will not be elaborated herein. 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 the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so as to facilitate the processor to call and execute the operations corresponding to the above respective modules.

[0096] In one embodiment, a computer device is provided. The computer device can be a server, and its internal structure diagram can be as Figure 3 shown. The computer device includes a processor, a memory, a network interface, and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a readable storage medium and an internal memory. The readable storage medium stores an operating system, computer-readable instructions, and a database. The internal memory provides an environment for the operation of the operating system and computer-readable instructions in the readable storage medium. The database of the computer device is used to store the data involved in the vehicle body structure design method. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer-readable instructions are executed by the processor, the above vehicle body structure design method is implemented. The readable storage medium provided in this embodiment includes a non-volatile readable storage medium and a volatile readable storage medium.

[0097] In one embodiment, a computer device is provided, including a memory, a processor, and computer-readable instructions stored on the memory and executable on the processor. When the processor executes the computer-readable instructions, the following steps are implemented:

[0098] Construct an initial vehicle simulation model according to the initial force transmission path information and initial structural performance indicators of the basic vehicle model;

[0099] Perform a collision simulation analysis on the initial vehicle simulation model according to the collision data corresponding to the preset collision conditions, and obtain an initial simulation result including internal energy absorption data and cross-sectional force data;

[0100] Determine the target structural variables corresponding to the preset collision conditions according to the internal energy absorption data and the cross-sectional force data;

[0101] Perform a transformation process on the target structural variables according to the preset scaling factor range and the internal energy absorption increase ratio and cross-sectional force increase ratio corresponding to the target collision speed, and obtain multiple groups of variable data;

[0102] Construct a simulation sample library containing multiple vehicle simulation model samples, where each vehicle simulation model sample is reconstructed from the initial vehicle simulation model according to a set of the variable data;

[0103] Perform simulation analysis on each of the vehicle simulation model samples to obtain the optimal structural parameters corresponding to the target collision speed.

[0104] In one embodiment, one or more computer-readable storage media storing computer-readable instructions are provided. The readable storage media provided in this embodiment include non-volatile readable storage media and volatile readable storage media. Computer-readable instructions are stored on the readable storage media, and when the computer-readable instructions are executed by one or more processors, the above-described vehicle body structure design method is implemented.

[0105] Those of ordinary skill in the art can understand that all or part of the processes in the above-described embodiment methods can be completed by instructing relevant hardware through computer-readable instructions. The computer-readable instructions can be stored in a non-volatile readable storage medium or a volatile readable storage medium. When the computer-readable instructions are executed, they can include the processes of the above-described method embodiments. Among them, any reference to a memory, storage, database, or other medium used in the various 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 many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0106] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned 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.

[0107] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; 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 described 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 various embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for designing a vehicle body structure, characterized in that, Including: Construct an initial vehicle simulation model based on the initial force transmission path information and initial structural performance indicators of the basic vehicle model; Conduct a collision simulation analysis on the initial vehicle simulation model according to the collision data corresponding to the preset collision conditions, and obtain an initial simulation result including internal energy absorption data and cross-sectional force data; Determine the target structural variables corresponding to the preset collision conditions according to the internal energy absorption data and the cross-sectional force data; Perform transformation processing on the target structural variables according to the preset scaling coefficient range, the internal energy absorption increase ratio, and the cross-sectional force increase ratio corresponding to the target collision speed, to obtain multiple sets of variable data; Construct a simulation sample library including multiple vehicle simulation model samples, and each vehicle simulation model sample is reconstructed from the initial vehicle simulation model according to a set of the variable data; Conduct simulation analysis on each of the vehicle simulation model samples to obtain the optimal structural parameters corresponding to the target collision speed.

2. The vehicle body structure design method according to claim 1, wherein The initial force transmission path information includes multiple body structure components for constructing a force transmission path corresponding to the preset collision conditions; the internal energy absorption data includes the internal energy absorption of each body structure component in the force transmission path under the preset collision conditions; The cross-sectional force data includes the cross-sectional forces borne by each body structure component in the force transmission path under the preset collision conditions; The determining the target structural variables corresponding to the preset collision conditions according to the internal energy absorption data and the cross-sectional force data includes: Determine the target absorption amount from all the internal energy absorptions according to the preset internal energy ratio index; Determine the maximum value of all the cross-sectional forces as the target cross-sectional force; Determine at least one of the target structural variables from a preset number of structural variables according to the target absorption amount and the target cross-sectional force.

3. The vehicle body structure design method according to claim 2, wherein, The determining at least one of the target structural variables from a preset number of structural variables according to the target absorption amount and the target cross-sectional force includes: Obtain a quantity variable index corresponding to the target absorption amount and a type variable index corresponding to the target cross-sectional force; Determine at least one of the target structural variables from a preset number of structural variables according to the quantity variable index and the type variable index.

4. The vehicle body structure design method according to claim 1, wherein, The performing transformation processing on the target structural variables according to the preset scaling coefficient range, the internal energy absorption increase ratio, and the cross-sectional force increase ratio corresponding to the target collision speed, to obtain multiple sets of variable data includes: Sample from the preset scaling coefficient range based on the Latin hypercube design method to obtain multiple proportional scaling coefficients; Scale the internal energy absorption increase ratio and the cross-sectional force increase ratio according to each of the proportional scaling coefficients to obtain a target absorption amount ratio and a target cross-sectional ratio corresponding to the proportional scaling coefficient; Perform transformation processing on the target structural variables according to the target absorption amount ratio and the target cross-sectional ratio corresponding to each of the proportional scaling coefficients, to obtain variable data corresponding one by one to each of the proportional scaling coefficients.

5. The vehicle body structure design method according to claim 1, characterized in that The constructing a simulation sample library including multiple vehicle simulation model samples includes: Simplify the initial vehicle simulation model to obtain a simplified model; Rebuild the simplified model according to each group of the variable data to obtain a vehicle simulation model sample corresponding to this group of variable data; Generate the simulation sample library according to all the vehicle simulation model samples.

6. The vehicle body structure design method according to claim 1, wherein Performing simulation analysis on each of the vehicle simulation model samples to obtain the optimal structural parameters corresponding to the target collision speed, including: Performing finite element simulation analysis on each of the vehicle simulation model samples respectively to obtain response points corresponding to each of the vehicle simulation model samples; Performing collision analysis on the response surface formed by each of the response points based on the target collision speed to obtain a target response point with the optimal collision performance and collision response data corresponding to the target response point; Determine the collision response data as the optimal structural parameters corresponding to the target collision speed.

7. The vehicle body structure design method according to claim 1, characterized in that The preset collision conditions include a frontal collision condition, a side collision condition, and a rear collision condition; the initial force transmission path information includes a first vehicle body structural component for constructing a first force transmission path corresponding to the frontal collision, a second vehicle body structural component for constructing a second force transmission path corresponding to the side collision condition, and a third vehicle body structural component for constructing a third force transmission path corresponding to the rear collision condition.

8. An automobile body structure design device, characterized in that, Including: An initial vehicle simulation model construction module, configured to construct an initial vehicle simulation model according to the initial force transmission path information and the initial structural performance indexes of the basic vehicle type; A collision simulation analysis module, configured to perform collision simulation analysis on the initial vehicle simulation model according to the collision data corresponding to the preset collision conditions to obtain an initial simulation result including internal energy absorption amount data and cross-sectional force data; A target structural variable determination module, configured to determine the target structural variables corresponding to the preset collision conditions according to the internal energy absorption amount data and the cross-sectional force data; A multi-group variable data acquisition module, configured to perform transformation processing on the target structural variables according to a preset scaling coefficient range and the internal energy absorption amount increase ratio and cross-sectional force increase ratio corresponding to the target collision speed to obtain multi-group variable data; A simulation sample library construction module, configured to construct a simulation sample library including multiple vehicle simulation model samples, and each vehicle simulation model sample is rebuilt from the initial vehicle simulation model according to a group of the variable data; An optimal structural parameter determination module, configured to perform simulation analysis on each of the vehicle simulation model samples to obtain the optimal structural parameters corresponding to the target collision speed.

9. A computer device, comprising a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, characterized in that, When the processor executes the computer-readable instructions, it implements the vehicle body structure design method according to any one of claims 1 to 7.

10. One or more readable storage media storing computer-readable instructions, characterized in that, When the computer-readable instructions are executed by one or more processors, the one or more processors are caused to execute the vehicle body structure design method according to any one of claims 1 to 7.

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