Door apron handrail tension working condition simulation analysis method and device and electronic equipment

Abstract

This application relates to a simulation analysis method, device, and electronic device for the tensile stress condition of a vehicle door panel armrest. The method includes: identifying the finite element fixture region of the finite element model of the vehicle door panel armrest; generating an equivalent envelope surface based on the finite element fixture region; performing an equivalent simulation on the equivalent envelope surface to obtain a rigid body; and determining the principal nodes of the rigid body. Based on a preset constraint coupling relationship, loads are applied at the principal nodes to generate loading curves, and initial simulation analysis results are generated based on the loading curves. Finally, the final simulation analysis results are determined based on the initial simulation analysis results. This solves the problem of large discrepancies between simulation results and actual vehicle test results, low simulation accuracy, and inability to accurately guide product structural design and optimization in related modeling methods. It significantly improves the accuracy of simulation analysis and performance prediction of vehicle door panel armrests, providing a reliable basis for their structural design, optimization, and strength verification, effectively reducing development costs and shortening the development cycle.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a method, device and electronic equipment for simulating and analyzing the tensile force of a vehicle door guardrail. Background Technology

[0002] Currently, vehicle door panel armrests are showing a diversified trend in terms of shape, height, and angle. However, most armrests are thin-walled injection-molded parts with a soft-covered structure, which poses a risk of insufficient strength. They are mainly connected to the panel using snap-fit, screw-fit, or welding methods. When the core stress area of ​​the armrest is subjected to a large load, problems such as cracking at the base of the armrest, breakage at the connection with the panel, and the armrest falling off the panel and losing its supporting function are prone to occur. The tensile test of the armrest is a product OTS verification item, which has relatively strict requirements for the armrest stiffness.

[0003] In related technologies, simulation methods for door panel armrests typically use rigid elements to constrain the clamping position of the armrest area and achieve the connection between the armrest and the panel through rigid elements.

[0004] However, the modeling methods of related technologies are relatively simple and crude, applying only a single-point concentrated load, which does not match the uniformly distributed force state when the user actually holds the product. This can easily lead to misjudgment of the failure location, resulting in a large deviation between the simulation results and the actual vehicle test results, and low simulation accuracy. This makes it impossible to accurately guide the product structure design and optimization, which urgently needs to be addressed. Summary of the Invention

[0005] This application provides a simulation analysis method, device, and electronic equipment for the tensile stress condition of a car door panel armrest, in order to solve the problems of large discrepancies between the simulation results and the actual vehicle test results of related technical modeling methods, low simulation accuracy, and inability to accurately guide product structural design and optimization. It significantly improves the accuracy of simulation analysis and performance prediction of car door panel armrests, provides a reliable basis for their structural design, optimization, and strength verification, and effectively reduces development costs and shortens the development cycle.

[0006] The first aspect of this application provides a simulation analysis method for the tensile force condition of a car door guardrail, including the following steps: Construct a finite element model of the car door panel and armrest; Identify the finite element fixture region of the finite element model of the door panel armrest, generate an equivalent envelope surface based on the finite element fixture region, perform equivalent simulation on the equivalent envelope surface to obtain a rigid body, and determine the main nodes of the rigid body. Based on the preset constraint coupling relationship, loads are applied at the master node to generate loading curves, and initial simulation analysis results are generated based on the loading curves. Finally, the simulation analysis results are determined based on the initial simulation analysis results.

[0007] Optionally, in some embodiments, before applying a load at the master node to generate a loading curve based on a preset constraint coupling relationship, the method further includes: Obtain the current pressure distribution data, and based on the current pressure distribution data, apply surface-to-surface fixed constraints in the pressure concentration area of ​​the finite element fixture region, and apply elastic constraints in the pressure dispersion area of ​​the finite element fixture region to determine the rigid body constraint relationship; The tensile conditions of the guardrail handrail are divided into lateral tensile conditions and longitudinal tensile conditions. Based on the lateral tensile conditions, the equivalent envelope surface is determined to be a surface-to-surface contact relationship, and based on the longitudinal tensile conditions, the equivalent envelope surface is determined to be a binding contact relationship. The preset constraint coupling relationship is determined based on rigid body constraint relationship, surface-to-surface contact relationship and bonded contact relationship.

[0008] Optionally, in some embodiments, based on a preset constraint coupling relationship, a loading curve is generated by uniformly applying a load at the master node, including: Based on the preset constraint coupling relationship, a preset load is applied at the master node, and the first duration of the preset load is obtained; If the first duration reaches the first preset duration, a preset unloading load is applied at the master node, and the second duration for applying the preset unloading load is obtained. If the second duration reaches the second preset duration, a loading curve is generated.

[0009] Optionally, in some embodiments, generating initial simulation analysis results based on the loading curve includes: Determine whether the finite element model of the door panel armrest meets the first preset condition under lateral tension and whether it meets the second preset condition under longitudinal tension. If the finite element model of the door panel armrest meets the first preset condition under lateral tension and the second preset condition under longitudinal tension, then the initial simulation analysis results are generated based on the loading curve; otherwise, the failure area of ​​the finite element model of the door panel armrest is determined, and the optimization strategy is determined based on the failure area.

[0010] Optionally, in some embodiments, determining the final simulation analysis result based on the initial simulation analysis result includes: The simulation deviation value is determined based on the initial simulation analysis results and the preset experimental results; Determine whether the simulation deviation value is less than or equal to the preset deviation threshold; If the simulation deviation value is less than or equal to the preset deviation threshold, the initial simulation analysis result is taken as the final simulation analysis result; otherwise, the finite element model of the door panel armrest is adjusted based on the initial simulation analysis result, and the step of identifying the finite element fixture area of ​​the door panel armrest finite element model is re-executed based on the adjusted finite element model of the door panel armrest until the new simulation deviation value is less than or equal to the preset deviation threshold.

[0011] A second aspect of this application provides a simulation analysis device for the tensile force of a car door guardrail, comprising: The building module is used to construct the finite element model of the door panel armrest; The identification module is used to identify the finite element fixture area of ​​the finite element model of the door panel armrest, generate an equivalent envelope surface based on the finite element fixture area, perform equivalent simulation on the equivalent envelope surface to obtain a rigid body, and determine the main nodes of the rigid body. The generation module is used to apply loads at the master node based on the preset constraint coupling relationship to generate a loading curve, generate initial simulation analysis results based on the loading curve, and determine the final simulation analysis results based on the initial simulation analysis results.

[0012] Optionally, in some embodiments, before applying a load at the master node to generate a loading curve based on a preset constraint coupling relationship, the generation module is further configured to: Obtain the current pressure distribution data, and based on the current pressure distribution data, apply surface-to-surface fixed constraints in the pressure concentration area of ​​the finite element fixture region, and apply elastic constraints in the pressure dispersion area of ​​the finite element fixture region to determine the rigid body constraint relationship; The tensile conditions of the guardrail handrail are divided into lateral tensile conditions and longitudinal tensile conditions. Based on the lateral tensile conditions, the equivalent envelope surface is determined to be a surface-to-surface contact relationship, and based on the longitudinal tensile conditions, the equivalent envelope surface is determined to be a binding contact relationship. The preset constraint coupling relationship is determined based on rigid body constraint relationship, surface-to-surface contact relationship and bonded contact relationship.

[0013] Optionally, in some embodiments, the generation module is specifically used for: Based on the preset constraint coupling relationship, a preset load is applied at the master node, and the first duration of the preset load is obtained; If the first duration reaches the first preset duration, a preset unloading load is applied at the master node, and the second duration for applying the preset unloading load is obtained. If the second duration reaches the second preset duration, a loading curve is generated.

[0014] Optionally, in some embodiments, the generation module is specifically used for: Determine whether the finite element model of the door panel armrest meets the first preset condition under lateral tension and whether it meets the second preset condition under longitudinal tension. If the finite element model of the door panel armrest meets the first preset condition under lateral tension and the second preset condition under longitudinal tension, then the initial simulation analysis results are generated based on the loading curve; otherwise, the failure area of ​​the finite element model of the door panel armrest is determined, and the optimization strategy is determined based on the failure area.

[0015] Optionally, in some embodiments, the generation module is specifically used for: The simulation deviation value is determined based on the initial simulation analysis results and the preset experimental results; Determine whether the simulation deviation value is less than or equal to the preset deviation threshold; If the simulation deviation value is less than or equal to the preset deviation threshold, the initial simulation analysis result is taken as the final simulation analysis result; otherwise, the finite element model of the door panel armrest is adjusted based on the initial simulation analysis result, and the step of identifying the finite element fixture area of ​​the door panel armrest finite element model is re-executed based on the adjusted finite element model of the door panel armrest until the new simulation deviation value is less than or equal to the preset deviation threshold.

[0016] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the simulation analysis method for the tensile force of the door guardrail as described in the first aspect embodiment.

[0017] The fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the simulation analysis method for the tensile force of the door panel armrest described in the first aspect embodiment.

[0018] Therefore, the embodiments of this application have at least the following beneficial effects: (1) The embodiments of this application assign actual values ​​to the connection characteristics of plastic parts and consider the nonlinear behavior of the guard plate material. At the same time, the clamping area of ​​the test fixture is identified and simplified to generate an equivalent envelope surface that fits the test state. The actual connection relationship between the guard plate and the handrail is accurately restored, eliminating the inherent defects of the simulation model from the root and improving the simulation accuracy and calculation efficiency.

[0019] (2) By constructing contact relationships, constraint coupling relationships and applying reasonable loads, the embodiments of this application can eliminate the problems of parameter distortion and inconsistency with working conditions, significantly reduce the number of physical prototype trials and actual vehicle tests, reduce product development costs and shorten the development cycle. At the same time, it can avoid the risk of handrail performance redundancy or product damage failure due to insufficient simulation accuracy, and significantly improve product reliability and market competitiveness.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart illustrating a simulation analysis method for the tensile force condition of a car door guardrail according to an embodiment of this application. Figure 2 This is a schematic diagram of a lateral tension clamp according to an embodiment of this application; Figure 3 This is a structural schematic diagram of a longitudinal tensile force clamp according to an embodiment of this application; Figure 4 This is a simplified structural diagram of a lateral tension clamp according to an embodiment of this application, showing its envelope surface. Figure 5 This is a simplified structural diagram of a longitudinal tensile force clamp according to an embodiment of this application, showing its envelope surface. Figure 6 This is a flowchart illustrating a simulation analysis method for the tensile force condition of a car door guardrail according to an embodiment of this application; Figure 7 This is a block diagram of a simulation analysis device for the tensile force of a car door guardrail according to an embodiment of this application; Figure 8 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0023] The following description, with reference to the accompanying drawings, describes a simulation analysis method, apparatus, and electronic device for the tensile stress conditions of a vehicle door panel armrest according to embodiments of this application. Addressing the issues mentioned in the background art where simulation results from related technical modeling methods deviate significantly from actual vehicle test results, resulting in low simulation accuracy and an inability to accurately guide product structural design and optimization, this application provides a simulation analysis method for the tensile stress conditions of a vehicle door panel armrest. This method can identify the finite element fixture region of the finite element model of the vehicle door panel armrest, generate an equivalent envelope surface of the finite element fixture region, simulate the equivalent envelope surface as a rigid body and determine its principal nodes, apply loads at the principal nodes to generate loading curves, and thus obtain the final simulation analysis results. This solves the problems of large discrepancies between simulation results and actual vehicle test results from related technical modeling methods, resulting in low simulation accuracy and an inability to accurately guide product structural design and optimization. It significantly improves the accuracy of simulation analysis and performance prediction for vehicle door panel armrests, providing a reliable basis for their structural design, optimization, and strength verification, effectively reducing development costs and shortening the development cycle.

[0024] Specifically, Figure 1 A flowchart illustrating the simulation analysis method for the tensile force condition of the door guardrail armrest provided in this application embodiment.

[0025] like Figure 1 As shown, the simulation analysis method for the tensile force condition of the door panel armrest includes the following steps: In step S101, a finite element model of the door panel armrest is constructed.

[0026] Specifically, the embodiments of this application can construct a finite element model of the door panel armrest based on the three-dimensional digital model of the door panel armrest, including the door panel body, armrest frame, armrest cover, connectors, buckles, door inner panel and door sheet metal, and complete the geometric cleanup and topology optimization of each component in HyperMesh, including removing non-critical chamfers, fillets, process holes and other redundant features with a radius of <1mm in the finite element model of the door panel armrest, while retaining the core structure of the armrest for force bearing and transmission.

[0027] Furthermore, since mesh quality is one of the core factors affecting simulation accuracy, this embodiment of the application can use a zoned differentiated meshing strategy to accurately mesh and optimize the quality of the finite element model of the door panel armrest based on the stress characteristics of the armrest under tension conditions. This requires a Jacobian coefficient ≥ 0.7, and also involves fine meshing of the mounting holes and snap-fit ​​connections between the armrest and the sheet metal. Specifically, for the armrest gripping area, the connection area between the armrest and the panel, and the stress concentration area of ​​the armrest frame, a fine shell element with a size of 5mm is used for accurate meshing; for the non-stressed area of ​​the door panel, a transition tetrahedral mesh with a size of 5~8mm is used for accurate meshing; and for the core area near the armrest gripping area that is prone to stress concentration, a fine hexahedral mesh with a size of 2~3mm is used for accurate meshing. The hexahedral mesh has a much higher calculation accuracy than the tetrahedral mesh, accurately capturing stress gradients and deformation trends, and avoiding simulation stiffness distortion caused by mesh quality issues.

[0028] Furthermore, in this embodiment, the connection unit CONN3D2 can be used to simulate the four connection forms in the connection of the guard plate: screw connection, welding, snap connection and snap fastening. A COUP_KIN rigid coupling constraint is applied to both ends of each connection unit. The coupling direction is defined as the normal of the two connection contact surfaces. Based on the actual mechanical characteristics of different connection forms, different material properties are assigned to the corresponding connection units to ensure the consistency between the simulation model and the measured data and the simulation accuracy.

[0029] Furthermore, in the embodiments of this application, a nonlinear elastoplastic constitutive relationship matching the actual working conditions can be used in the finite element model of the door panel armrest to replace the linear elastic parameters in related technologies. To address the modulus decay characteristics of non-metallic materials, the elastic modulus decay coefficient of the material is corrected, and the simulation environment temperature is set to room temperature to avoid the influence of material stiffness deviations caused by temperature changes on simulation accuracy. In addition, since material properties are significantly affected by temperature, if experiments are conducted under low or high temperature conditions, nonlinear material curves under extreme temperature fields must be used. For components near the armrest area and components that have already been damaged, stress-strain curves measured by tensile tests are applied to match the material stiffness characteristics under actual vehicle conditions.

[0030] In step S102, the finite element fixture region of the finite element model of the door panel armrest is identified, and an equivalent envelope surface is generated based on the finite element fixture region. The equivalent envelope surface is then simulated to obtain a rigid body, and the main nodes of the rigid body are determined.

[0031] Among them, the finite element clamp region is the equivalent mapping region of the actual clamping area of ​​the clamp and the handrail; the rigid body is the equivalent rigid body that simulates the rigidity characteristics of the clamp; the main node of the rigid body is the preset node that bears the displacement and load transfer of the rigid body.

[0032] Specifically, in this embodiment, the clamping claw structure, clamping stroke and limiting reference of the clamp can be determined based on the clamping design drawings of the physical test of the door guardrail armrest tension. The theoretical contact area between the clamp and the armrest, i.e. the initial boundary of the clamping area, can be initially delineated. The clamp and the guardrail armrest can be matched to identify the actual clamping area between the clamp and the armrest. The actual clamping area includes the contact contour between the armrest and the clamp, the clamping pressure distribution area and the clamp limiting reference surface.

[0033] Furthermore, in order to improve simulation accuracy, the embodiments of this application can obtain the precise geometric shape of the actual clamping area through three-dimensional scanning, and mark the boundary coordinates and loading position of the actual clamping area; the identified actual clamping area is equivalently mapped to the finite element model of the door panel armrest, so as to ensure that the finite element clamping area selected by the finite element model of the door panel armrest is consistent with the projected area of ​​the actual clamping area, thereby avoiding the reduction in simulation accuracy caused by the identification deviation of the finite element clamping area.

[0034] It should be understood that the above-described process of establishing fixture and armrest matching, position boundary positioning, and simulation mapping has strong versatility and can be applied to determining the clamping area of ​​door armrests for different vehicle models and structures. For example, since the fixtures for lateral tension conditions and longitudinal tension conditions are different, it is necessary to carefully identify the clamping position and select different finite element fixture areas for different clamping areas. If the selected finite element fixture area deviates too much from the actual clamping area, the simulation accuracy of the armrest deformation will be significantly reduced. Specifically, the fixtures for a certain vehicle model under lateral tension conditions and longitudinal tension conditions can be respectively as follows: Figure 2 and Figure 3 As shown; Figure 2 This is a schematic diagram of the structure of a lateral tension clamp according to one embodiment of this application. Figure 3 This is a structural schematic diagram of a longitudinal tensile working condition fixture provided in one embodiment of this application.

[0035] Furthermore, based on the selected finite element fixture region, this embodiment of the application can generate an equivalent envelope surface by combining equidistant offset and surface fitting. The offset distance of the equivalent envelope surface should be controlled within 0.5 mm to ensure that the generated equivalent envelope surface corresponds to the selected finite element fixture region. Simultaneously, factors such as subsequent contact relationship definition, accuracy, and convergence should be considered to ensure that the generated equivalent envelope surface has a different mesh size than the original finite element clamping region. For example, when defining the contact, the side with a coarser mesh, higher stiffness, and smoother geometry should be selected as the master surface of the equivalent envelope surface to ensure the stability and accuracy of the contact calculation; while the selected finite element fixture region, as the slave surface, should be refined using mesh refinement while ensuring a smooth transition. In addition, the difference in mesh size between the two parties should be avoided as much as possible. In this embodiment, the equivalent envelope surface generated can be geometrically compared with the original three-dimensional model using three-dimensional comparison software, and the deviation value can be calculated. The geometric deviation of the equivalent envelope surface around the core stress area should be controlled ≤0.2mm, and the geometric deviation of the envelope surface at the edge of the non-stress area should be controlled ≤0.5mm, so as to ensure that the equivalent envelope surface will not change the geometry of the core stress area.

[0036] Furthermore, in this embodiment, the established equivalent envelope surface can be equivalently simulated into a rigid body that will not deform. A node is defined as the master node of the rigid body, which acts as a purely rigid fixture. In the finite element software, this is represented as *RIGID BODY, REF NODE=1, ELSET=SURF. Here, the element set named "SURF" is defined as a rigid body, and node 1 is the control node of the rigid body. The movement of the rigid body is entirely controlled by the movement of this node. Specifically, the equivalent envelope surface generated by the fixture under lateral and longitudinal tension conditions for a certain vehicle model can be as follows: Figure 4 and Figure 5 As shown; Figure 4 A simplified structural diagram of a lateral tensile force clamp provided in one embodiment of this application, representing an envelope surface. Figure 5 This is a simplified structural diagram of a longitudinal tensile clamping fixture as an envelope surface, provided in one embodiment of this application.

[0037] In step S103, based on the preset constraint coupling relationship, a load is applied at the main node to generate a loading curve, and an initial simulation analysis result is generated according to the loading curve. The final simulation analysis result is then determined based on the initial simulation analysis result.

[0038] In some embodiments, a loading curve is generated by uniformly applying a load at the master node based on a preset constraint coupling relationship, including: applying a preset loading load at the master node based on the preset constraint coupling relationship, and obtaining a first duration of applying the preset loading load; when the first duration reaches a first preset duration, applying a preset unloading load at the master node, and obtaining a second duration of applying the preset unloading load, and generating a loading curve when the second duration reaches a second preset duration.

[0039] In some embodiments, generating initial simulation analysis results based on the loading curve includes: determining whether the finite element model of the door panel armrest meets a first preset condition under lateral tension and a second preset condition under longitudinal tension; if the finite element model of the door panel armrest meets the first preset condition under lateral tension and the second preset condition under longitudinal tension, then generating initial simulation analysis results based on the loading curve; otherwise, determining the failure area of ​​the finite element model of the door panel armrest and determining an optimization strategy based on the failure area.

[0040] In some embodiments, determining the final simulation analysis result based on the initial simulation analysis result includes: determining the simulation deviation value based on the initial simulation analysis result and the preset test result; determining whether the simulation deviation value is less than or equal to a preset deviation threshold; if the simulation deviation value is less than or equal to the preset deviation threshold, then the initial simulation analysis result is taken as the final simulation analysis result; otherwise, the finite element model of the door panel armrest is adjusted based on the initial simulation analysis result, and based on the adjusted finite element model of the door panel armrest, the step of identifying the finite element fixture area of ​​the finite element model of the door panel armrest is re-executed until the new simulation deviation value is less than or equal to the preset deviation threshold.

[0041] The initial simulation analysis results are uncorrected simulation calculation data; the final simulation analysis results are simulation calculation data after iterative calibration; the preset loading load and preset unloading load can both be loads preset by the user, which can be loads obtained through a limited number of experiments or loads obtained through a limited number of computer simulations, without specific limitations; the first duration is the duration of the actual loading process; the second duration is the duration of the actual unloading process; the first preset duration is the specified duration of load loading; the second preset duration is the specified duration of load unloading; the first preset condition is the performance judgment standard under lateral tensile conditions; the second preset condition is the performance judgment standard under longitudinal tensile conditions; the failure area is the part where structural failure occurs in the simulation; the simulation deviation value is the error value between the simulation result and the experimental result; the preset deviation threshold is the error limit for judging whether the simulation accuracy is qualified; the new simulation deviation value is the simulation and experimental error value recalculated after correction.

[0042] Specifically, in the simulation of the tensile condition of the door panel armrest, the load application method and loading curve must be consistent with the test conditions. However, the simulation analysis methods in related technologies usually adopt a constant load loading method, ignoring the load variation in the tensile test, resulting in a large deviation between the simulation results and the test results. To address this, this embodiment can be based on the test tensile condition: the load is applied along the actual force direction at the main node position (i.e., the geometric center) of the armrest, and the load application position is adjusted according to the main node position of the finite element fixture area to ensure that the simulated force application point coincides with the tensile force application point in the finite element fixture area during the test, avoiding torque distortion due to the deviation of the force application point. Simultaneously, this embodiment can define a loading-unloading curve: 0~0.8s is the stable load loading stage, ending at 0.8s; 0.8~1s is the linear unloading stage, until the load drops to 0N. Regardless of whether the equivalent envelope surface is curved or planar, the load can be uniformly transferred in a loading-unloading manner through a preset constraint coupling relationship. Specifically, in this embodiment, a preset load that is stable for 0 to 0.8 seconds can be applied to the master node first, and the loading ends at 0.8 seconds. Then, a preset load that decreases linearly for 0.8 to 1 second can be applied to the master node until the load returns to zero.

[0043] Furthermore, this embodiment of the application can verify the core performance of the armrest, such as its load-bearing capacity and deformation stability, under real tensile conditions by quantitatively analyzing the loading curve, while also verifying the effectiveness and accuracy of the finite element model of the door panel armrest. Specifically, this embodiment of the application can divide the tensile conditions of the armrest into two loading forms: lateral tensile force and longitudinal tensile force. Through finite element calculation simulation analysis, the area including the armrest gripping area, the connection root, the buckle mounting position, and the connection area with the door panel is taken to ensure coverage of the entire path of tensile load transmission. First, it is determined whether the finite element model of the door panel armrest meets the first preset condition under the lateral tensile condition. The first preset condition is: a lateral load of 500N, using the loading curve mentioned above, requiring deformation ≤ 5mm, applying a 500N force along the Y direction at the rigid principal node and extracting the displacement response of the equivalent envelope surface, and a lateral load of 1000N, requiring no failure under the large load, extracting the maximum principal stress in each key area and recording the value and corresponding position, focusing on the stress concentration at the connection root. If the stress exceeds The material's yield strength must consider its nonlinear characteristics. If the plastic strain is less than 5%, the requirement is met; otherwise, it is not. Secondly, it is determined whether the finite element model of the door panel armrest meets the second preset condition under longitudinal tensile load. The second preset condition is: a 500N load is applied along the armrest's normal direction, requiring a normal displacement ≤ 5mm; a 500N force is applied along the normal direction at the rigid principal node, and the displacement response of the inner equivalent envelope surface is extracted; and a 1000N load is applied longitudinally, requiring no failure under the large load, with 5% plastic strain as the evaluation index. If the requirements are met, initial simulation analysis results are generated based on the loading curve; otherwise, the failure region of the finite element model of the door panel armrest is determined, the causes of failure (such as insufficient reinforcement, failure, etc.) are analyzed, and targeted optimization directions are output based on the failure region to determine the optimization strategy.

[0044] Furthermore, if parameter iteration calibration and experimental benchmarking are not performed after the simulation is completed, and the initial simulation analysis results are directly used as the design basis, it is very easy for the failure location and deformation amount output by the simulation to be inconsistent with the preset experimental results. At the same time, due to the influence of factors such as material nonlinearity, contact area, and constraint conditions, even if the initial simulation analysis results are corrected, there will still be deviations from the preset experimental results. To this end, the embodiments of this application can use a correction iteration method and a fixed step size parameter scanning method to quickly reduce deviations and improve simulation accuracy. Specifically, the embodiments of this application can be evaluated from three dimensions: result rationality, data consistency, and working condition adaptability. Result rationality is based on preset experimental results, comparing simulation and experimental trends, and prioritizing the correction of parameters such as contact friction coefficient, connector stiffness, constraint method, and contact area. This gradually reduces the deviation between simulated deformation and maximum stress value and the experimental results until the accuracy requirements are met. Benchmark indicators include the maximum deformation of the handrail and stress distribution trends. If the simulation deviation is less than or equal to a preset deviation threshold, the simulation model is deemed valid, and its modeling form, key parameters, and contact relationships are solidified as a standard template for subsequent simulation analysis of similar handrails. If the simulation deviation exceeds the preset deviation threshold, a second optimization correction is performed on the mesh, contact area, contact form, material, and contact parameters using a fixed-step parameter scanning method until the accuracy requirements are met. If, based on high-precision simulation results, stress concentration is found at the root of the connection between the handrail frame and the guard plate, approaching the material's yield strength, reinforcing ribs can be added to this area for optimization. After optimization, the simulated stress value is reduced, meeting strength requirements without increasing the guard plate's mass. After optimizing and calibrating the above model, the process is solidified into standardized analysis items. The preset deviation threshold can be 5%.

[0045] Therefore, the embodiments of this application can accurately predict the stiffness and durability of door panel armrests in the early stages of product development, conduct timely structural optimization and risk assessment, and form a forward development capability under tensile conditions. This fundamentally eliminates problems such as stiffness redundancy, contact penetration, and model idealization, controlling the deviation between simulation and experimental results within 5%. It provides accurate basis for structural design, strength verification, and mass production reliability verification, effectively avoiding quality hazards such as cracking and excessive deformation. At the same time, this method is highly versatile and can be adapted to door panel armrests of different models and structures, and can be extended to other load-bearing components of automotive interiors. The process is based solely on the finite element software Abaqus and can be solidified and packaged. Relying on standardized templates, it greatly improves analysis efficiency, ensures consistency and comparability of results, and has outstanding value for engineering application and promotion. Furthermore, by ensuring that the product performance meets the standards under tensile conditions and avoiding the risk of insufficient structural strength, a new simulation analysis method is formed by benchmarking simulation and experimentation and continuously iterated and optimized. In the design stage, the stiffness and strength are accurately predicted and optimized in a timely manner to eliminate potential quality hazards. With the help of multi-dimensional simulation model optimization and parameter correction, the simulation results are highly consistent with the experimental data, which successfully guides the optimization of handrail structure and has strong practicality and applicability.

[0046] Furthermore, to enable those skilled in the art to better understand how the preset constraint coupling relationship is constructed in the simulation analysis method for the tensile force of the door guardrail of this application, the following description is provided in conjunction with specific embodiments.

[0047] As one possible implementation, in some embodiments, before applying a load at the master node to generate a loading curve based on a preset constraint coupling relationship, the method further includes: acquiring current pressure distribution data, and based on the current pressure distribution data, applying surface-to-surface fixed constraints in the pressure concentration area of ​​the finite element fixture region and applying elastic constraints in the pressure dispersion area of ​​the finite element fixture region to determine rigid body constraint relationships; dividing the tension condition of the guardrail handrail into lateral tension condition and longitudinal tension condition, and based on the lateral tension condition, determining that the equivalent envelope surface is a surface-to-surface contact relationship, and based on the longitudinal tension condition, determining that the equivalent envelope surface is a bound contact relationship; and determining a preset constraint coupling relationship based on the rigid body constraint relationship, surface-to-surface contact relationship, and bound contact relationship.

[0048] Among them, the current pressure distribution data are measured or calculated data reflecting the pressure magnitude and distribution characteristics of each zone in the finite element fixture area under the current working conditions.

[0049] Specifically, establishing contact and constraints is a crucial step in ensuring simulation accuracy. Simulation analysis methods in related technologies often fail to consider contact relationships and mismatches between constraints and actual experiments, leading to large deviations between simulated deformation and experimental results, and inaccurate stress and strain. Therefore, this application's embodiments define contact types such as surface-to-surface contact and elastic constraints based on the clamping method of the door panel armrest and the fixture, and set the friction coefficient to 0.1~0.3. The friction coefficient of the contact relationship needs to be calibrated through actual vehicle assembly friction tests, with test temperatures covering extreme conditions from -40℃ to 85℃ to ensure the simulation accuracy of the contact relationship under different temperature environments. For example, the friction coefficient of the armrest contacting the door sheet metal can be set to 0.32, the friction coefficient of the armrest body contacting the surface can be set to 0.3, and the gap between the buckle and the mounting hole can be set to 0.15mm with a friction coefficient of 0.35.

[0050] Furthermore, in this embodiment of the application, a surface-to-surface fixed constraint can be applied in the pressure concentration area of ​​the finite element fixture region based on the current pressure distribution data, and an elastic constraint can be applied in the pressure dispersion area of ​​the finite element fixture region, replacing the "full-area rigid constraint" in related technologies.

[0051] Furthermore, embodiments of this application can define constraint relationships for rigid bodies, establish rigid constraint bindings for reference nodes, and set constraint associations between nodes and elements. Specifically, in lateral tensile conditions, embodiments of this application can establish an equivalent envelope surface near the handrail, define a surface-to-surface contact relationship, and set the local slippage to be very small (SMALL SLIDING); a local coordinate system is established along the handrail normal to constrain the inner plate to a fixed position, while simultaneously constraining the degrees of freedom of the rigid body's main node 1 except for the loading direction. In longitudinal tensile conditions, embodiments of this application can establish an equivalent envelope surface at the contact surface of the handrail, define a binding contact relationship (i.e., a tie contact relationship), and set the contact type to surface-to-surface.

[0052] Furthermore, the embodiments of this application require pre-simulation verification of the constructed rigid body constraint relationship, surface-to-surface contact relationship and binding contact relationship to check for problems such as contact penetration, excessive constraint restriction or insufficient constraint; if there are unreasonable constraints, the constraint coupling direction needs to be re-optimized until the force transmission path of the pre-simulation is consistent with the actual assembly logic.

[0053] Therefore, the embodiments of this application can provide better guidance for design in the early stages of development by assigning values ​​to the connection characteristics of plastic parts, defining the nonlinearity of the guard plate material, identifying the clamping area of ​​the test fixture, and simplifying the equivalent envelope surface. This provides accurate simulation basis for structural optimization, strength verification, and mass production reliability verification, restoring the actual assembly and test state of the guard plate and handrail, and eliminating the defects of the simulation model from the root. At the same time, by constructing contact and constraint coupling relationships, applying loads and loading curves, and decomposing working conditions, multi-dimensional optimization and correction are carried out. Combined with simulation and test benchmarking and iteration, problems such as parameter distortion and working condition discrepancies can be solved. While improving the accuracy and efficiency of simulation, it can accurately predict the displacement, stress and strain, and failure risk under tensile load, reduce the number of physical prototype and actual vehicle tests, reduce development costs, and shorten the development cycle. In the future, simulation can be gradually used to replace testing, thereby improving product reliability and market competitiveness.

[0054] Furthermore, to enable those skilled in the art to better understand the simulation analysis method for the tensile force condition of the door panel armrest of this application, the following is combined with... Figure 6 Specific embodiments will be described below.

[0055] Figure 6 This is a flowchart illustrating a simulation analysis method for the tensile force condition of a car door guardrail armrest, provided as an embodiment of this application.

[0056] like Figure 6 As shown, the simulation analysis method for the tensile force of the door panel armrest includes the following steps: S601, mission initiated.

[0057] S602, Simulation model establishment.

[0058] S603 defines parameters based on the nonlinear curve of the protective plate material and the nonlinear characteristics of the connecting unit.

[0059] S604, Identify the clamping area of ​​the test fixture.

[0060] S605, equivalently simplifies the generation of the envelope surface.

[0061] S606 establishes contact and constraint coupling relationships.

[0062] S607, apply load and define loading curve.

[0063] S608, Handrail Tension Performance Analysis.

[0064] S609 is used for simulation analysis of lateral and longitudinal tensile forces.

[0065] S610, simulation results evaluation and verification (compared with experiments), and method correction and iteration.

[0066] S611, mission complete.

[0067] The simulation analysis method for the tensile stress condition of the door panel armrest proposed in this application can identify the finite element fixture region of the finite element model of the door panel armrest, generate the equivalent envelope surface of the finite element fixture region, simulate the equivalent envelope surface as a rigid body and determine its principal nodes, apply loads at the principal nodes to generate loading curves, and thus obtain the final simulation analysis results. This solves the problem of large discrepancies between simulation results and actual vehicle test results, low simulation accuracy, and inability to accurately guide product structural design and optimization in related modeling methods. It significantly improves the accuracy of simulation analysis and performance prediction of the door panel armrest, providing a reliable basis for its structural design, optimization, and strength verification, effectively reducing development costs and shortening the development cycle.

[0068] Next, the simulation analysis device for the pulling force of the door guardrail armrest proposed in this application is described with reference to the accompanying drawings.

[0069] Figure 7 This is a block diagram of the simulation analysis device for the tensile force of the door guardrail armrest proposed in the embodiments of this application.

[0070] like Figure 7 As shown, the door panel armrest tension condition simulation analysis device 10 includes: a construction module 100, an identification module 200, and a generation module 300.

[0071] The system includes a construction module 100 for constructing a finite element model of the door panel armrest; an identification module 200 for identifying the finite element fixture region of the door panel armrest finite element model, generating an equivalent envelope surface based on the finite element fixture region, performing an equivalent simulation on the equivalent envelope surface to obtain a rigid body, and determining the principal nodes of the rigid body; and a generation module 300 for applying loads at the principal nodes based on preset constraint coupling relationships to generate loading curves, generating initial simulation analysis results based on the loading curves, and determining the final simulation analysis results based on the initial simulation analysis results.

[0072] Optionally, in some embodiments, before applying a load at the main node to generate a loading curve based on a preset constraint coupling relationship, the generation module 300 is further configured to: acquire current pressure distribution data, and based on the current pressure distribution data, apply surface-to-surface fixed constraints in the pressure concentration area of ​​the finite element fixture region, and apply elastic constraints in the pressure dispersion area of ​​the finite element fixture region to determine rigid body constraint relationships; divide the tension condition of the guardrail handrail into lateral tension condition and longitudinal tension condition, and based on the lateral tension condition, determine that the equivalent envelope surface is a surface-to-surface contact relationship, and based on the longitudinal tension condition, determine that the equivalent envelope surface is a bound contact relationship; and determine the preset constraint coupling relationship according to the rigid body constraint relationship, the surface-to-surface contact relationship, and the bound contact relationship.

[0073] Optionally, in some embodiments, the generation module 300 is specifically used to: apply a preset loading load at the master node based on a preset constraint coupling relationship, and obtain a first duration of applying the preset loading load; when the first duration reaches a first preset duration, apply a preset unloading load at the master node, and obtain a second duration of applying the preset unloading load, and when the second duration reaches a second preset duration, generate a loading curve.

[0074] Optionally, in some embodiments, the generation module 300 is specifically used to: determine whether the finite element model of the door panel armrest meets a first preset condition under lateral tension and a second preset condition under longitudinal tension; if the finite element model of the door panel armrest meets the first preset condition under lateral tension and the second preset condition under longitudinal tension, then generate initial simulation analysis results based on the loading curve; otherwise, determine the failure area of ​​the finite element model of the door panel armrest and determine an optimization strategy based on the failure area.

[0075] Optionally, in some embodiments, the generation module 300 is specifically used to: determine the simulation deviation value based on the initial simulation analysis results and the preset test results; determine whether the simulation deviation value is less than or equal to a preset deviation threshold; if the simulation deviation value is less than or equal to the preset deviation threshold, then the initial simulation analysis result is used as the final simulation analysis result; otherwise, adjust the finite element model of the door panel armrest based on the initial simulation analysis results, and based on the adjusted finite element model of the door panel armrest, re-execute the step of identifying the finite element fixture area of ​​the finite element model of the door panel armrest until the new simulation deviation value is less than or equal to the preset deviation threshold.

[0076] It should be noted that the explanation of the above-mentioned embodiment of the simulation analysis method for the tension condition of the door panel armrest also applies to the simulation analysis device for the tension condition of the door panel armrest in this embodiment, and will not be repeated here.

[0077] The simulation analysis device for the tensile stress condition of the car door panel armrest proposed in this application can identify the finite element fixture region of the finite element model of the car door panel armrest, generate the equivalent envelope surface of the finite element fixture region, simulate the equivalent envelope surface as a rigid body and determine its principal nodes, apply loads at the principal nodes to generate loading curves, and thus obtain the final simulation analysis results. This solves the problem of large discrepancies between simulation results and actual vehicle test results, low simulation accuracy, and inability to accurately guide product structural design and optimization in related modeling methods. It significantly improves the accuracy of simulation analysis and performance prediction of the car door panel armrest, providing a reliable basis for its structural design, optimization, and strength verification, effectively reducing development costs and shortening the development cycle.

[0078] Figure 8A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 801, the processor 802, and the computer program stored on the memory 801 and capable of running on the processor 802.

[0079] When the processor 802 executes the program, it implements the simulation analysis method for the tensile force of the door guardrail provided in the above embodiments.

[0080] Furthermore, the electronic device also includes: Communication interface 803 is used for communication between memory 801 and processor 802.

[0081] The memory 801 is used to store computer programs that can run on the processor 802.

[0082] The memory 801 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0083] If the memory 801, processor 802, and communication interface 803 are implemented independently, then the communication interface 803, memory 801, and processor 802 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized into address buses, data buses, control buses, etc. For ease of representation, Figure 8 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0084] Optionally, in a specific implementation, if the memory 801, processor 802, and communication interface 803 are integrated on a single chip, then the memory 801, processor 802, and communication interface 803 can communicate with each other through an internal interface.

[0085] The processor 802 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0086] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the following... Figure 1 The simulation analysis method for the tensile force condition of the door guardrail is shown.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0089] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0090] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0091] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0092] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0093] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0094] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for simulating and analyzing a tension working condition of a door apron handrail, characterized in that, include: Construct a finite element model of the car door panel and armrest; Identify the finite element fixture region of the finite element model of the door panel armrest, generate an equivalent envelope surface based on the finite element fixture region, perform equivalent simulation on the equivalent envelope surface to obtain a rigid body, and determine the main nodes of the rigid body; Based on the preset constraint coupling relationship, a load is applied at the main node to generate a loading curve, and an initial simulation analysis result is generated according to the loading curve. The final simulation analysis result is then determined based on the initial simulation analysis result.

2. The method of claim 1, wherein, Before applying a load at the master node to generate a loading curve based on the preset constraint coupling relationship, the process further includes: Acquire current pressure distribution data, and based on the current pressure distribution data, apply surface-to-surface fixed constraints to the pressure concentration area of ​​the finite element fixture region, and apply elastic constraints to the pressure dispersion area of ​​the finite element fixture region to determine rigid body constraint relationships; The tensile conditions of the guardrail handrail are divided into lateral tensile conditions and longitudinal tensile conditions. Based on the lateral tensile conditions, the equivalent envelope surface is determined to be a surface-to-surface contact relationship. Based on the longitudinal tensile conditions, the equivalent envelope surface is determined to be a binding contact relationship. The preset constraint coupling relationship is determined based on the rigid body constraint relationship, the surface-to-surface contact relationship, and the binding contact relationship.

3. The method according to claim 1, characterized in that, The method of uniformly applying loads at the master node to generate a loading curve based on a preset constraint coupling relationship includes: Based on the preset constraint coupling relationship, a preset loading load is applied at the master node, and the first duration of applying the preset loading load is obtained; When the first duration reaches the first preset duration, a preset unloading load is applied at the master node, and a second duration for applying the preset unloading load is obtained. When the second duration reaches the second preset duration, the loading curve is generated.

4. The method according to claim 1, characterized in that, The step of generating initial simulation analysis results based on the loading curve includes: Determine whether the finite element model of the door panel armrest meets the first preset condition under lateral tension and whether it meets the second preset condition under longitudinal tension. If the finite element model of the door panel armrest meets the first preset condition under the lateral tensile condition and the second preset condition under the longitudinal tensile condition, then the initial simulation analysis result is generated according to the loading curve; otherwise, the failure area of ​​the finite element model of the door panel armrest is determined, and an optimization strategy is determined according to the failure area.

5. The method according to claim 1, characterized in that, The step of determining the final simulation analysis result based on the initial simulation analysis result includes: The simulation deviation value is determined based on the initial simulation analysis results and the preset experimental results; Determine whether the simulation deviation value is less than or equal to a preset deviation threshold; If the simulation deviation value is less than or equal to the preset deviation threshold, the initial simulation analysis result is taken as the final simulation analysis result; otherwise, the finite element model of the door panel armrest is adjusted based on the initial simulation analysis result, and the step of identifying the finite element fixture area of ​​the finite element model of the door panel armrest is re-executed based on the adjusted finite element model of the door panel armrest until the new simulation deviation value is less than or equal to the preset deviation threshold.

6. A simulation analysis device for the tensile force of a car door panel armrest, characterized in that, include: The building module is used to construct the finite element model of the door panel armrest; The identification module is used to identify the finite element fixture area of ​​the finite element model of the door panel armrest, generate an equivalent envelope surface based on the finite element fixture area, perform equivalent simulation on the equivalent envelope surface to obtain a rigid body, and determine the main nodes of the rigid body. The generation module is used to apply loads at the main node based on preset constraint coupling relationships to generate loading curves, generate initial simulation analysis results based on the loading curves, and determine the final simulation analysis results based on the initial simulation analysis results.

7. The apparatus according to claim 6, characterized in that, Before generating a loading curve by applying a load at the master node based on the preset constraint coupling relationship, the generation module is further configured to: Acquire current pressure distribution data, and based on the current pressure distribution data, apply surface-to-surface fixed constraints to the pressure concentration area of ​​the finite element fixture region, and apply elastic constraints to the pressure dispersion area of ​​the finite element fixture region to determine rigid body constraint relationships; The tensile conditions of the guardrail handrail are divided into lateral tensile conditions and longitudinal tensile conditions. Based on the lateral tensile conditions, the equivalent envelope surface is determined to be a surface-to-surface contact relationship. Based on the longitudinal tensile conditions, the equivalent envelope surface is determined to be a binding contact relationship. The preset constraint coupling relationship is determined based on the rigid body constraint relationship, the surface-to-surface contact relationship, and the binding contact relationship.

8. The apparatus according to claim 6, characterized in that, The generation module is specifically used for: Based on the preset constraint coupling relationship, a preset loading load is applied at the master node, and the first duration of applying the preset loading load is obtained; When the first duration reaches the first preset duration, a preset unloading load is applied at the master node, and a second duration for applying the preset unloading load is obtained. When the second duration reaches the second preset duration, the loading curve is generated.

9. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the simulation analysis method for the tensile force condition of the door panel armrest as described in any one of claims 1-5.

10. A computer-readable storage medium storing a computer program, characterized in that, When the program is executed by the processor, it implements the simulation analysis method for the tensile force condition of the door panel armrest as described in any one of claims 1-5.

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