A method and system for improving the quality of a simulation model of a car crash seat cushion system
By conducting impact simulation tests and benchmarking analysis on the seat cushion model, the material and structural parameters of the seat 3D model were optimized, solving the problem of insufficient accuracy of the seat cushion model and achieving efficient simulation analysis and cost savings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- VOYAH AUTOMOBILE TECH CO LTD
- Filing Date
- 2022-09-06
- Publication Date
- 2026-05-19
AI Technical Summary
In existing technologies, the accuracy of car seat cushion models is insufficient, resulting in inconsistencies between simulation analysis and physical experiments, which increases the cost of simulation optimization and iteration, as well as product development.
Impact simulation tests were conducted on the seat cushion foam material and system model by constructing an impact tooling model. The simulation test data was obtained and compared with the physical test data for analysis, and the material and structural parameters of the seat 3D model were updated.
This improved the accuracy of the seat cushion model, reduced the need for multiple modifications and iterations in simulation analysis, shortened vehicle development time, and lowered costs.
Smart Images
Figure CN115470627B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vehicle simulation testing technology, and more specifically, to a method, system, electronic device, and storage medium for improving the quality of a simulation model of an automobile collision seat cushion system. Background Technology
[0002] With the booming development of the automotive industry, the requirements for vehicle safety performance are becoming increasingly stringent. Currently, many countries have promulgated and implemented numerous mandatory automotive crash safety performance standards, such as the US FMVSS crash safety regulations, the European ECE and EEC crash safety regulations, and the Japanese TRIAS crash safety standards. my country has also promulgated a series of mandatory automotive crash safety standards, including GB and CMVDR, covering test components such as seat belts, seats, headrests, steering systems, and door locks. Whole-vehicle crash tests include frontal, side, rear-end, and offset collisions. Early passive safety research primarily employed repeated testing methods. The performance testing of vehicle structural crashworthiness and occupant protection systems relied heavily on experimental methods and experience, which required a considerable amount of time. Traditional testing methods required manually building dozens of new cars for each automotive safety performance test, resulting in enormous costs and unsatisfactory test results.
[0003] Applying virtual testing technology to automotive safety testing allows for collision scenario analysis during the product design phase. This enables the study of stress and deformation in key automotive components, shortening development cycles and reducing manufacturing costs. Complete vehicle designs can undergo safety performance simulation tests, allowing for the analysis and comparison of various safety performance indicators. This provides accurate data and significantly reduces the number of prototype tests. Finite element simulation analysis of automotive collision safety is a crucial step in automotive product development. Conducting collision simulations during the vehicle design phase ensures that the required collision performance is incorporated into the structural design, guaranteeing the vehicle meets relevant national safety standards and regulations.
[0004] In vehicle interior restraint systems, seats, as the components with the most contact with occupants, are one of the main components protecting occupants from injury during a car crash. Therefore, the accuracy of seat models becomes particularly important when using finite element models for car crash simulations. OEMs typically use original seat models directly as inputs into whole vehicle or sled models for simulation optimization analysis, such as original seat models provided by suppliers, rarely performing re-certification and benchmarking of these original models. Although basic benchmarking of original seat models is generally performed, due to the current fast market pace, short project development cycles, tight human resources, and the need for cost reduction, not all seat models are of very high quality. This can easily lead to inconsistencies between simulation analysis of whole vehicle or sled models and physical experimental benchmarks, increasing the amount of simulation optimization iterations and the number of physical whole vehicle or sled crash tests, thus significantly increasing product development costs. Therefore, it is necessary to develop a simplified process for simple and rapid benchmarking of seat models to establish a benchmarking method for driver and passenger seat cushion models in car crashes, in order to verify and improve the quality of seat cushion models. Summary of the Invention
[0005] This invention addresses the technical problems existing in the prior art by providing a method, system, electronic device, and storage medium for improving the quality of a simulation model of an automotive crash seat cushion system. It verifies and benchmarks the automotive crash seat cushion model, which can verify and optimize the original seat cushion model, reducing the need for multiple modifications and iterations in simulation analysis due to inaccurate seat cushion models, thereby saving vehicle development time and costs.
[0006] According to a first aspect of the present invention, a method for improving the quality of a simulation model of an automotive crash seat cushion system is provided, comprising:
[0007] The seat cushion foam material model is obtained by using the 3D model of the seat. The first impact fixture model is constructed to conduct impact simulation tests on the seat cushion foam material model to obtain the seat cushion material simulation test data. The seat cushion material simulation test data is compared with the actual test data of the seat cushion material, and the material parameters of the seat cushion foam material model in the 3D model of the seat are updated according to the analysis results.
[0008] The seat cushion system model is obtained by using the 3D model of the seat. A second impact fixture model is constructed to conduct impact simulation tests on the preset area of the seat cushion system model, and the simulation test data of the seat cushion system is obtained. The simulation test data of the seat cushion system is compared with the physical test data of the seat cushion system, and the skeleton material parameters and structural parameters of the 3D model of the seat are updated according to the analysis results.
[0009] Based on the above technical solution, the present invention can also be improved as follows.
[0010] Optionally, obtaining the seat cushion foam material model from the three-dimensional model of the seat includes:
[0011] The model of the cushion foam material was extracted from the 3D model of the seat using simulation software, and the size of the cushion foam material model was cut to approximate the size of the cushion material test sample.
[0012] If the cushion foam material model is a regional hardness foam on the main plane, then take out the largest and most regular cube from the center of the different hardness regions as the cushion foam material model to be tested.
[0013] Optionally, the process of obtaining physical test data for cushion materials includes:
[0014] The first impact fixture is made according to the requirements of the seat cushion material test. The first impact fixture is matched with the seat cushion material test sample, so that the impact surface of the first impact fixture is larger than the test surface of the seat cushion material test sample.
[0015] The test sample of the cushion material is fixedly set up with its test surface facing the impact surface of the first impact fixture. The impact block of the first impact fixture impacts the test surface of the cushion material test sample perpendicularly with a preset initial velocity and mass. The acceleration change curve and displacement change curve of the impact block of the first impact fixture are recorded and saved as physical test data of the cushion material.
[0016] Optionally, the construction of the first impact fixture model to conduct impact simulation tests on the cushion foam material model to obtain cushion material simulation test data includes:
[0017] The first impact fixture model is constructed according to the test requirements of the cushion material. The first impact fixture model is matched with the cushion foam material model so that the impact surface of the first impact fixture model is larger than the test surface of the cushion foam material model.
[0018] The cushion foam material model is fixedly set up with its test surface facing the impact surface of the first impact fixture model. The impact block of the first impact fixture model impacts the test surface of the cushion foam material model perpendicularly with a preset initial velocity and mass. The acceleration change curve and displacement change curve of the impact block of the first impact fixture model are recorded and saved as cushion material simulation test data.
[0019] Optionally, the material parameters of the cushion foam material model include at least the hysteresis unloading coefficient and / or shape factor.
[0020] Optionally, the step of conducting an impact simulation test on a preset area of the seat cushion system model using a second impact fixture model to obtain seat cushion system simulation test data includes:
[0021] A second impact fixture model is constructed according to the test requirements of the cushion system. The second impact fixture model includes an impact block arranged opposite each other and a sliding mounting end. The impact block of the second impact fixture model simulates the shape of a 50th-degree human buttock and its mass is set to the weight of a 50th-degree human upper body. The sliding mounting end of the second impact fixture model is used to support the cushion system model and adjust the displacement of the cushion system model. The displacement direction of the cushion system model is perpendicular to the impact direction of the impact block of the second impact fixture model.
[0022] The seat cushion system model is installed on the sliding mounting end of the second impact fixture model, and the center area of the seat cushion of the seat cushion system model is aligned with the center of the impact block of the second impact fixture model. Multiple preset initial velocities are used to vertically impact the test surface of the seat cushion system model in turn. The acceleration change curve and displacement change curve of the impact block of the second impact fixture model are recorded during each impact and saved as test data of the center point of the seat cushion system model.
[0023] Adjust the displacement of the seat cushion system model so that the front end area of the seat cushion system model is aligned with the impact block of the second impact fixture model. Then, the seat cushion system model is impacted vertically with multiple preset initial velocities in turn. Record the acceleration change curve and displacement change curve of the impact block of the second impact fixture model during each impact and save them as the front end test data of the seat cushion system model.
[0024] The test data of the center point of the seat cushion system model and the test data of the front end of the seat cushion system model are saved as the seat cushion system simulation test data.
[0025] Optionally, when the front end region of the seat cushion system model is aligned with the impact block of the second impact fixture model, the front edge of the seat cushion system model is flush with the edge of the impact block of the second impact fixture model.
[0026] According to a second aspect of the present invention, a system for improving the quality of a simulation model of an automotive crash seat cushion system is provided, comprising:
[0027] The acquisition module is used to acquire physical test data of the cushion material and physical test data of the cushion system;
[0028] The seat cushion foam material testing module is used to obtain a seat cushion foam material model from a 3D model of the seat, construct a first impact fixture model to conduct impact simulation tests on the seat cushion foam material model, and obtain seat cushion material simulation test data; the seat cushion material simulation test data is compared and analyzed with the actual test data of the seat cushion material, and the material parameters of the seat cushion foam material model in the 3D model of the seat are updated according to the analysis results;
[0029] The seat cushion system testing module is used to obtain a seat cushion system model from a 3D model of the seat, construct a second impact fixture model to conduct impact simulation tests on a preset area of the seat cushion system model, and obtain seat cushion system simulation test data; the seat cushion system simulation test data is compared and analyzed with the actual test data of the seat cushion system, and the skeleton material parameters and structural parameters of the 3D model of the seat are updated according to the analysis results.
[0030] According to a third aspect of the present invention, an electronic device is provided, including a memory and a processor, wherein the processor is configured to execute a computer management program stored in the memory to implement the steps of the above-described method for improving the quality of a simulation model of an automobile collision seat cushion system.
[0031] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer management program is stored, wherein when executed by a processor, the computer management program implements the steps of the above-described method for improving the quality of a simulation model of an automobile collision seat cushion system.
[0032] This invention provides a method, system, electronic device, and storage medium for improving the quality of a simulation model of an automotive crash seat cushion system. Using 3D simulation software, it verifies and benchmarks the driver and passenger seat cushion models from two perspectives: the foam material model and the cushion system model. This verifies and optimizes the original seat cushion model, ensuring its quality meets the requirements of OEMs for simulation analysis models used in whole-vehicle or slide tests. This method facilitates the establishment of model verification standards at OEMs, providing higher-quality simulation models. It reduces the need for multiple modifications and iterations in future whole-vehicle or slide tests due to inaccuracies in the seat cushion model, significantly reducing simulation analysis time and improving the overall quality of the seat model in the whole-vehicle or slide test, ultimately reducing automotive development costs. Attached Figure Description
[0033] Figure 1 A flowchart of a method for improving the quality of a simulation model of an automotive collision seat cushion system provided by the present invention;
[0034] Figure 2 A schematic diagram of the seat cushion model and the part under test provided by the present invention;
[0035] Figure 3 This is a schematic diagram showing the fit between the cushion foam material model provided by the present invention and the impact block after cutting.
[0036] Figure 4 This is a schematic diagram illustrating the impact test principle of the cushion foam material model provided by the present invention.
[0037] Figure 5(a) is a schematic diagram of the acceleration change curve obtained from the model test of the cushion foam material, and Figure 5(b) is a schematic diagram of the displacement change curve obtained from the model test of the cushion foam material.
[0038] Figure 6(a) is a schematic diagram of the impact test of the center area of the seat cushion, and Figure 6(b) is a schematic diagram of the impact test of the front area of the seat cushion.
[0039] Figure 7(a) is a schematic diagram of the acceleration change curve obtained from the impact test in the center area of the seat cushion, and Figure 7(b) is a schematic diagram of the displacement change curve obtained from the impact test in the center area of the seat cushion.
[0040] Figure 8 A structural block diagram of a car crash seat cushion system quality improvement system simulation model provided by the present invention;
[0041] Figure 9 A schematic diagram of the hardware structure of a possible electronic device provided by the present invention;
[0042] Figure 10 This is a schematic diagram of the hardware structure of a possible computer-readable storage medium provided by the present invention. Detailed Implementation
[0043] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0044] Figure 1 A flowchart of a method for improving the quality of a simulation model of an automotive crash seat cushion system provided by this invention is shown below. Figure 1 As shown, the method includes:
[0045] The seat cushion foam material model is obtained by using the 3D model of the seat. The first impact fixture model is constructed to conduct impact simulation tests on the seat cushion foam material model to obtain the seat cushion material simulation test data. The seat cushion material simulation test data is compared with the actual test data of the seat cushion material, and the material parameters of the seat cushion foam material model in the 3D model of the seat are updated according to the analysis results.
[0046] The seat cushion system model is obtained by using the 3D model of the seat. A second impact fixture model is constructed to conduct impact simulation tests on the preset area of the seat cushion system model, and the simulation test data of the seat cushion system is obtained. The simulation test data of the seat cushion system is compared with the physical test data of the seat cushion system, and the skeleton material parameters and structural parameters of the 3D model of the seat are updated according to the analysis results.
[0047] Understandably, given the deficiencies in the background technology, this invention proposes a method for improving the quality of a simulation model of an automotive crash seat cushion system. This method utilizes 3D simulation software, such as LS-DYNA coupling software, to establish a simulation. CAE verification and benchmarking analysis is performed on the driver and passenger seat cushion models from two perspectives: the seat cushion foam material model and the seat cushion system model. This verifies and optimizes the original seat model, especially its seat cushion system model, ensuring that the simulation model quality meets the requirements of OEMs for simulation analysis models used in vehicle testing or slide testing. This reduces the need for multiple modifications and iterations in simulation analysis due to inaccuracies in the seat cushion model during future vehicle or slide tests, significantly reducing simulation analysis time and improving the overall seat model quality of the vehicle or slide test model, ultimately reducing automotive development costs.
[0048] In one possible embodiment, obtaining the seat cushion foam material model from the three-dimensional model of the seat includes:
[0049] The model of the cushion foam material was extracted from the 3D model of the seat using simulation software, and the size of the cushion foam material model was cut to approximate the size of the cushion material test sample.
[0050] If the cushion foam material model is a regional hardness foam on the main plane, then take out the largest and most regular cube from the center of the different hardness regions as the cushion foam material model to be tested.
[0051] Understandably, in this embodiment, to verify the material accuracy of the seat cushion foam model, samples of the seat cushion foam material model are taken for impact testing. To ensure a high degree of consistency between the simulation model test and the actual physical test, the dimensions of the seat cushion foam material model are cut to approximate the dimensions of the seat cushion material test sample. For example... Figure 3The diagram shows a cut and smoothed model of the seat cushion foam material. The specific procedure involves extracting the foam material model from the original driver and passenger seat models and cutting it into a size approximating the physical test sample size of the foam material using CAE verification software, such as Hypermesh. In practice, the physical test sample is typically cut from the center of the seat cushion to a length and width of 300x300mm and a thickness of approximately 20mm. For seat cushion foam materials with uneven hardness distribution, if the foam is distributed across different hardness zones on the main plane, large, regularly shaped cubes should be taken from the centers of different hardness zones for physical impact testing. Simultaneously, the simulation model should be consistent with the physical sample areas of different hardness zones and impact simulations should be performed separately. That is, impact tests are performed separately for foam materials in different hardness zones to obtain multiple sets of test data. It should be noted that the seat cushion foam model is typically a tetrahedral structure with a unit size of 15mm. The side of the seat cushion facing upwards, for example... Figure 4 The A-side shown typically features different deep groove structures to accommodate seat cover installation, etc. Whether it is a physical test sample or a simulation model, the shape of the A-side must be consistent with the actual vehicle seat cushion.
[0052] In one possible embodiment, before conducting the simulation test, it is necessary to obtain physical test data of the cushion material. The process of obtaining the physical test data of the cushion material includes:
[0053] The first impact fixture is made according to the requirements of the seat cushion material test. The first impact fixture is matched with the seat cushion material test sample, so that the impact surface of the first impact fixture is larger than the test surface of the seat cushion material test sample.
[0054] The test sample of the cushion material is fixedly set up with its test surface facing the impact surface of the first impact fixture. The impact block of the first impact fixture impacts the test surface of the cushion material test sample perpendicularly with a preset initial velocity and mass. The acceleration change curve and velocity change curve of the impact block of the first impact fixture are recorded and saved as physical test data of the cushion material.
[0055] It is understood that, through the steps of this embodiment, a physical impact test was conducted on the physical test sample of the cushion material to obtain physical test data of the cushion material, which serves as a comparison benchmark for the impact test of the cushion foam material model. The solid line in Figure 5(a) shows the curve of the acceleration of the impact block obtained from the physical impact test of the cushion foam material over time, and the solid line in Figure 5(b) shows the curve of the displacement of the impact block obtained from the physical impact test of the cushion foam material over time. These curves will serve as a comparison benchmark for the simulation test of the cushion foam material model, used to determine the accuracy of the cushion foam material model. It should be noted that when making the first impact fixture for the physical test, the impact surface of the impact block must be larger than the measured surface area of the cushion material test sample, ensuring that the measured surface of the cushion material test sample is fully covered by the impact surface of the impact block to guarantee the accuracy of the test results. For example, the physical test sample of the foam material is cut from the center of the cushion to a length and width of 300x300mm and a thickness of approximately 20mm. Figure 3 As shown, the impact surface size of the impact block of the first impact fixture is set to 330x305mm, making the impact surface of the first impact fixture larger than the test surface of the cushion material test specimen. In the impact simulation test, the dimensions of the first impact fixture model and the cut cushion foam material model are consistent with the dimensions of the physical test specimen. In the test scenario of this embodiment, the mass m of the impact block is set to 12.7kg, and the initial velocity V0 of the impact block is set to 2.7m / s.
[0056] In one possible embodiment, such as Figure 4 As shown in the experimental schematic diagram, the first impact fixture model is constructed to conduct an impact simulation test on the cushion foam material model, and the simulation test data of the cushion material is obtained, including:
[0057] The first impact fixture model is constructed according to the test requirements of the cushion material. The first impact fixture model is matched with the cushion foam material model so that the impact surface of the first impact fixture model is larger than the test surface of the cushion foam material model.
[0058] The cushion foam material model is fixedly set up with its test surface facing the impact surface of the first impact fixture model. The impact block of the first impact fixture model impacts the test surface of the cushion foam material model perpendicularly with a preset initial velocity and mass. The acceleration change curve and velocity change curve of the impact block of the first impact fixture model are recorded and saved as cushion material simulation test data.
[0059] Understandably, given the existing experimental data of the seat cushion material, impact simulation tests on the seat cushion foam material model can be conducted. The parameters of the first impact fixture model constructed using simulation software must be consistent with those of the actual first impact fixture. Specifically, in the LSDYNA simulation analysis, the model impact block uses the same dimensions, mass, and initial velocity as the impact block of the actual first impact fixture. The material of the impact block is set to a rigid material, Mat.20, and the thickness is arbitrarily set. Figure 4 .like Figure 4 As shown, side A (the tested side) of the seat cushion foam material faces the impact block, while side B (the side facing away from the tested side) is fixed on the test device. The impact block impacts side A with a set initial velocity. Curves showing the acceleration and displacement of the impact block over time can be obtained from both physical and simulation experiments. The curves from the physical and simulation experiments are compared and analyzed. If the differences are significant, the parameters of the seat cushion foam material are adjusted accordingly, and the simulation experiment is iterated again until the benchmark results reach an acceptable level, as shown in Figure 5. Figure 5(a) shows the comparison results of the acceleration curve of the impact block, and Figure 5(b) shows the comparison results of the displacement curve of the impact block. In Figures 5(a) and 5(b), the dashed line represents the impact simulation results after optimization of the seat cushion foam material model, and the solid line represents the repeatability results of the physical experiment of the seat cushion foam material. A comparison of Figures 5(a) and 5(b) shows that the simulation results obtained after optimizing the seat cushion foam material model are very close to the physical test results of the seat cushion foam material. Once the benchmark results of the simulation test reach an acceptable level, the benchmarked foam material parameters can be incorporated into the original seat model to optimize the original seat cushion model.
[0060] In one possible embodiment, the material parameters of the cushion foam material model include at least the hysteresis unloading coefficient HU and / or the shape factor SHAPE.
[0061] Understandably, adjusting the parameters of foamed materials mainly involves adjusting two parameters in the material card: "Hysteresis Unloading Coefficient HU" and "Shape Factor". Both are factors that affect the foaming hysteresis characteristics during the unloading phase. The former can be adjusted between 0 and 1, while the latter, a value less than 1, represents reduced energy dissipation, and a value greater than 1 represents accelerated energy dissipation.
[0062] In one possible embodiment, the step of conducting an impact simulation test on a preset area of the seat cushion system model using a second impact fixture model to obtain seat cushion system simulation test data includes:
[0063] A second impact fixture model is constructed according to the requirements of the seat cushion system test. The second impact fixture model includes an impact block arranged opposite each other and a sliding mounting end. It should be noted that the impact block of the second impact fixture model simulates the shape of a 50th-degree human buttock and its mass is set to the weight of a 50th-degree human upper body, for example, 30 kg. In this embodiment, the thickness of the impact block is set to 83 mm. The sliding mounting end of the second impact fixture model is provided with a sliding rail and a slider connected by sliding connection. The slider is used to carry the seat cushion system model to be tested, and the rail is used to adjust the displacement of the seat cushion system model. The sliding displacement direction of the seat cushion system model is perpendicular to the impact direction of the impact block of the second impact fixture model, so that the tested area is adjustable.
[0064] During the simulation test, as shown in Figure 6(a), the seat cushion system model is installed on the sliding mounting end of the second impact fixture model using simulation software, so that the center area of the seat cushion of the seat cushion system model is aligned with the center of the impact block of the second impact fixture model. The test surface of the seat cushion system model is impacted vertically in turn with multiple preset initial velocities, such as 2m / s, 4m / s, and 6m / s. The acceleration change curve and displacement change curve of the impact block of the second impact fixture model are recorded during each impact and saved as test data of the center point of the seat cushion system model.
[0065] After completing the impact simulation test of the center of the seat cushion, as shown in Figure 6(b), the displacement of the seat cushion system model is adjusted so that the front end area of the seat cushion system model is aligned with the impact block of the second impact fixture model. Multiple preset initial velocities, such as 2m / s, 4m / s, and 6m / s, are used to alternately and perpendicularly impact the test surface of the front end area of the seat cushion system model. The acceleration change curve and displacement change curve of the impact block of the second impact fixture model are recorded during each impact and saved as the front end test data of the seat cushion system model.
[0066] The test data of the center point of the seat cushion system model and the test data of the front end of the seat cushion system model are saved as the seat cushion system simulation test data.
[0067] Understandably, for the impact test of the seat cushion system model, tests are conducted at two test points: the center of the seat cushion and the front end area. This allows for comparison of test data from multiple angles, improving the accuracy of the seat cushion model. Similar to the simulation test of the seat cushion foam material model, physical test data of the seat cushion system is obtained through physical tests of the actual seat cushion system before conducting the impact simulation test of the seat cushion system model. After obtaining the simulation test data of the seat cushion system through simulation, a benchmark analysis is performed between it and the actual test data of the seat cushion system. Based on the differences in the benchmark analysis results, the skeleton material parameters and structural parameters of the 3D model of the seat are adjusted back, such as the connection method of the seat skeleton. After adjustment, the simulation test is iterated again until the difference between the simulation test data of the seat cushion system and the actual test data of the seat cushion system is within an acceptable range. Taking the impact test results of the center area of the seat cushion as an example, Figure 7(a) shows a schematic diagram of the acceleration change curve obtained from the impact test of the center area of the seat cushion, and Figure 7(b) shows a schematic diagram of the displacement change curve obtained from the impact test of the center area of the seat cushion. In Figures 7(a) and 7(b), the dashed line represents the curve obtained from the impact test of the center area of the unoptimized original seat cushion model, the dotted line represents the simulation result of the impact of the center area of the optimized seat cushion model, and the solid line represents the repeatability result of the physical test of the seat cushion system. A comparison of Figures 7(a) and 7(b) shows that the test results obtained after the optimized seat cushion model undergoes the impact simulation test of the center area are very close to the physical test results of the seat cushion system, thus verifying the feasibility and superiority of the method of this invention.
[0068] In one possible embodiment, when the front end region of the cushion system model is aligned with the impact block of the second impact fixture model, the front edge of the cushion system model is flush with the edge of the impact block of the second impact fixture model.
[0069] It is understood that this embodiment specifies the front end area of the cushion system model so that during the impact test, the impact surface of the impact block of the second impact fixture model is entirely within the test surface area of the cushion system model, thereby improving the accuracy of the test.
[0070] It is worth noting that the parameters of the seat cushion foam material model were updated in the simulation test of the seat cushion foam material model; the skeleton material parameters and structural parameters of the seat 3D model were updated in the impact test of the center area and the front area of the seat cushion system model; through the impact simulation test from two angles, the overall 3D model of the seat was updated, and the error of the original seat cushion model was corrected.
[0071] Figure 8A structural diagram of a quality improvement system for a car crash seat cushion system simulation model provided in this embodiment of the invention is shown below. Figure 8 As shown, a quality improvement system for a simulation model of an automotive crash seat cushion system includes an acquisition module, a cushion foam material testing module, and a cushion system testing module, wherein:
[0072] The acquisition module acquires physical test data of the cushion material and physical test data of the cushion system.
[0073] The seat cushion foam material testing module is used to obtain a seat cushion foam material model from a 3D model of the seat, construct a first impact fixture model to conduct impact simulation tests on the seat cushion foam material model, and obtain seat cushion material simulation test data; the seat cushion material simulation test data is compared and analyzed with the actual test data of the seat cushion material, and the material parameters of the seat cushion foam material model in the 3D model of the seat are updated according to the analysis results;
[0074] The seat cushion system testing module is used to obtain a seat cushion system model from a 3D model of the seat, construct a second impact fixture model to conduct impact simulation tests on a preset area of the seat cushion system model, and obtain seat cushion system simulation test data; the seat cushion system simulation test data is compared and analyzed with the actual test data of the seat cushion system, and the skeleton material parameters and structural parameters of the 3D model of the seat are updated according to the analysis results.
[0075] It is understood that the quality improvement system for the simulation model of the car collision seat cushion system provided by the present invention corresponds to the quality improvement method for the simulation model of the car collision seat cushion system provided in the foregoing embodiments. The relevant technical features of the quality improvement system for the simulation model of the car collision seat cushion system can be referred to the relevant technical features of the quality improvement method for the simulation model of the car collision seat cushion system, and will not be repeated here.
[0076] Please see Figure 9 , Figure 9 This is a schematic diagram illustrating an embodiment of the electronic device provided in this invention. For example... Figure 9 As shown, an embodiment of the present invention provides an electronic device, including a memory 910, a processor 920, and a computer program 911 stored in the memory 910 and executable on the processor 920. When the processor 920 executes the computer program 911, it performs the following steps:
[0077] Obtain physical test data of the cushion material and physical test data of the cushion system;
[0078] The seat cushion foam material model is obtained by using the 3D model of the seat. The first impact fixture model is constructed to conduct impact simulation tests on the seat cushion foam material model to obtain the seat cushion material simulation test data. The seat cushion material simulation test data is compared with the actual test data of the seat cushion material, and the material parameters of the seat cushion foam material model in the 3D model of the seat are updated according to the analysis results.
[0079] The seat cushion system model is obtained by using the 3D model of the seat. A second impact fixture model is constructed to conduct impact simulation tests on the preset area of the seat cushion system model, and the simulation test data of the seat cushion system is obtained. The simulation test data of the seat cushion system is compared with the physical test data of the seat cushion system, and the skeleton material parameters and structural parameters of the 3D model of the seat are updated according to the analysis results.
[0080] Please see Figure 10 , Figure 10 This is a schematic diagram illustrating an embodiment of a computer-readable storage medium provided by the present invention. (See diagram below.) Figure 10 As shown, this embodiment provides a computer-readable storage medium 1000, on which a computer program 1011 is stored. When the computer program 1011 is executed by a processor, it performs the following steps:
[0081] Obtain physical test data of the cushion material and physical test data of the cushion system;
[0082] The seat cushion foam material model is obtained by using the 3D model of the seat. The first impact fixture model is constructed to conduct impact simulation tests on the seat cushion foam material model to obtain the seat cushion material simulation test data. The seat cushion material simulation test data is compared with the actual test data of the seat cushion material, and the material parameters of the seat cushion foam material model in the 3D model of the seat are updated according to the analysis results.
[0083] The seat cushion system model is obtained by using the 3D model of the seat. A second impact fixture model is constructed to conduct impact simulation tests on the preset area of the seat cushion system model, and the simulation test data of the seat cushion system is obtained. The simulation test data of the seat cushion system is compared with the physical test data of the seat cushion system, and the skeleton material parameters and structural parameters of the 3D model of the seat are updated according to the analysis results.
[0084] This invention provides a method, system, and storage medium for improving the quality of a car crash seat cushion system simulation model. Using 3D simulation software, it verifies and benchmarks the driver and passenger seat cushion models from two perspectives: the foam material model and the cushion system model. This verifies and optimizes the original seat cushion model, ensuring its quality meets the requirements of OEMs for simulation analysis models used in whole-vehicle or slide tests. This method facilitates the establishment of model verification standards at OEMs, providing higher-quality simulation models and reducing the need for multiple modifications and iterations in future whole-vehicle or slide tests due to inaccuracies in the seat cushion model, thus significantly reducing simulation analysis time. Furthermore, this method can be modified to improve the accuracy of the driver and passenger seat backrests, headrests, and rear seat simulation models, achieving an overall improvement in the quality of the seat models in the whole vehicle or slide test, further reducing automotive development cycles and costs.
[0085] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0086] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0087] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0088] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0089] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0090] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.
[0091] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.
Claims
1. A method for improving the quality of a simulation model of an automotive crash seat cushion system, characterized in that, include: The seat cushion foam material model is obtained by using the 3D model of the seat. The first impact fixture model is constructed to conduct impact simulation tests on the seat cushion foam material model to obtain the seat cushion material simulation test data. The seat cushion material simulation test data is compared with the actual test data of the seat cushion material, and the material parameters of the seat cushion foam material model in the 3D model of the seat are updated according to the analysis results. The seat cushion system model is obtained by using the 3D model of the seat. A second impact fixture model is constructed to conduct impact simulation tests on the preset area of the seat cushion system model, and the simulation test data of the seat cushion system is obtained. The simulation test data of the seat cushion system is compared with the physical test data of the seat cushion system, and the skeleton material parameters and structural parameters of the 3D model of the seat are updated according to the analysis results.
2. The method for improving the quality of a simulation model of an automotive collision seat cushion system according to claim 1, characterized in that, The process of obtaining the seat cushion foam material model through the three-dimensional model of the seat includes: The model of the cushion foam material was extracted from the 3D model of the seat using simulation software, and the size of the cushion foam material model was cut to approximate the size of the cushion material test sample. If the cushion foam material model is a regional hardness foam on the main plane, then take out the largest and most regular cube from the center of the different hardness regions as the cushion foam material model to be tested.
3. The method for improving the quality of a simulation model of an automotive collision seat cushion system according to claim 1, characterized in that, The process of obtaining physical test data for cushion materials includes: The first impact fixture is made according to the requirements of the seat cushion material test. The first impact fixture is matched with the seat cushion material test sample, so that the impact surface of the first impact fixture is larger than the test surface of the seat cushion material test sample. The test sample of the cushion material is fixedly set up with its test surface facing the impact surface of the first impact fixture. The impact block of the first impact fixture impacts the test surface of the cushion material test sample perpendicularly with a preset initial velocity and mass. The acceleration change curve and displacement change curve of the impact block of the first impact fixture are recorded and saved as physical test data of the cushion material.
4. A method for improving the quality of a simulation model of an automotive crash seat cushion system according to any one of claims 1 to 3, characterized in that, The first impact fixture model is constructed to conduct impact simulation tests on the cushion foam material model, and the simulation test data of the cushion material is obtained, including: The first impact fixture model is constructed according to the test requirements of the cushion material. The first impact fixture model is matched with the cushion foam material model so that the impact surface of the first impact fixture model is larger than the test surface of the cushion foam material model. The cushion foam material model is fixedly set up with its test surface facing the impact surface of the first impact fixture model. The impact block of the first impact fixture model impacts the test surface of the cushion foam material model perpendicularly with a preset initial velocity and mass. The acceleration change curve and displacement change curve of the impact block of the first impact fixture model are recorded and saved as cushion material simulation test data.
5. The method for improving the quality of a simulation model of an automotive collision seat cushion system according to claim 1, characterized in that, The material parameters of the cushion foam material model include at least the hysteresis unloading coefficient and / or shape factor.
6. The method for improving the quality of a simulation model of an automotive collision seat cushion system according to claim 1, characterized in that, The second impact fixture model is constructed to conduct impact simulation tests on a preset area of the seat cushion system model, obtaining simulation test data of the seat cushion system, including: A second impact fixture model is constructed according to the test requirements of the cushion system. The second impact fixture model includes an impact block arranged opposite each other and a sliding mounting end. The impact block of the second impact fixture model simulates the shape of a 50th-degree human buttock and its mass is set to the weight of a 50th-degree human upper body. The sliding mounting end of the second impact fixture model is used to support the cushion system model and adjust the displacement of the cushion system model. The displacement direction of the cushion system model is perpendicular to the impact direction of the impact block of the second impact fixture model. The seat cushion system model is installed on the sliding mounting end of the second impact fixture model, and the center area of the seat cushion of the seat cushion system model is aligned with the center of the impact block of the second impact fixture model. Multiple preset initial velocities are used to vertically impact the test surface of the seat cushion system model in turn. The acceleration change curve and displacement change curve of the impact block of the second impact fixture model are recorded during each impact and saved as test data of the center point of the seat cushion system model. Adjust the displacement of the seat cushion system model so that the front end area of the seat cushion system model is aligned with the impact block of the second impact fixture model. Then, the seat cushion system model is impacted vertically with multiple preset initial velocities in turn. Record the acceleration change curve and displacement change curve of the impact block of the second impact fixture model during each impact and save them as the front end test data of the seat cushion system model. The test data of the center point of the seat cushion system model and the test data of the front end of the seat cushion system model are saved as the seat cushion system simulation test data.
7. The method for improving the quality of a simulation model of an automotive collision seat cushion system according to claim 6, characterized in that, When the front end of the cushion system model is aligned with the impact block of the second impact fixture model, the front edge of the cushion system model is flush with the edge of the impact block of the second impact fixture model.
8. A quality improvement system for a simulation model of an automotive crash seat cushion system, characterized in that, The method described by any one of claims 1 to 7 comprises: The acquisition module is used to acquire physical test data of the cushion material and physical test data of the cushion system; The seat cushion foam material testing module is used to obtain a seat cushion foam material model from a 3D model of the seat, construct a first impact fixture model to conduct impact simulation tests on the seat cushion foam material model, and obtain seat cushion material simulation test data; the seat cushion material simulation test data is compared and analyzed with the actual test data of the seat cushion material, and the material parameters of the seat cushion foam material model in the 3D model of the seat are updated according to the analysis results; The seat cushion system testing module is used to obtain a seat cushion system model from a 3D model of the seat, construct a second impact fixture model to conduct impact simulation tests on a preset area of the seat cushion system model, and obtain seat cushion system simulation test data; the seat cushion system simulation test data is compared and analyzed with the actual test data of the seat cushion system, and the skeleton material parameters and structural parameters of the 3D model of the seat are updated according to the analysis results.
9. An electronic device, characterized in that, The system includes a memory and a processor, wherein the processor is used to execute computer management programs stored in the memory to implement the steps of the method for improving the quality of a simulation model of an automobile collision seat cushion system as described in any one of claims 1-7.
10. A computer-readable storage medium, characterized in that, It stores a computer management program, which, when executed by a processor, implements the steps of a method for improving the quality of a simulation model of an automobile collision seat cushion system as described in any one of claims 1-7.