A parameter-driven simulation analysis method for a passenger car lock hook bearing performance

Abstract

This invention relates to a parameter-driven simulation analysis method for the load-bearing performance of passenger car locking hooks. The method includes: parametric modeling of the locking hook and extraction of driving parameters; finite element modeling of the locking hook system, comprising three parts: finite element modeling of the locking hook, simplified finite element modeling of the base plate, and simplified finite element modeling of the ratchet; setting and defining the load-bearing capacity analysis of the locking hook, with load-bearing capacity settings for three directions; data processing of the load-bearing performance analysis results; load-bearing performance evaluation and post-processing of results; adjusting structural parameters and verifying the load-bearing performance of the new parameters; and re-verifying and evaluating the results after modifying the design scheme. This method is computationally fast and can provide strong support for layout requirements during product development. It can quickly verify the impact of different layout schemes on the load-bearing performance of the locking hook, including indicators such as stiffness, strength failure, and failure deformation during the load-bearing process. It can also predict various failure deformations of the structure under different load-bearing capacity indicators, providing strong support for product design.

Description

Technical Field

[0001] This invention belongs to the field of automotive product development technology, specifically relating to a parameter-driven simulation analysis method for the load-bearing performance of passenger car lock hooks. Background Technology

[0002] In the automotive product development process, the dimensions of the lock hook assembly are adjusted according to the structural layout requirements and specific circumstances, such as the lock hook cross-sectional dimensions, overall dimensions, and engagement position. During the design phase, the layout scheme needs to consider multiple factors and develop various position and size options to support rapid design decisions. Therefore, a simple and effective method for verifying the load-bearing capacity of passenger vehicle lock hooks is essential. Summary of the Invention

[0003] The purpose of this invention is to provide a parameter-driven simulation analysis method for the load-bearing performance of passenger car lock hook assemblies, so as to solve the problem of simple and effective verification of the load-bearing performance of passenger car lock hooks.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A parameter-driven simulation analysis method for the load-bearing performance of passenger car lock hooks includes the following steps:

[0006] A. Parametric modeling and driving of the locking hook involves parameter extraction;

[0007] B. Finite element modeling of the locking hook system, which includes three parts: finite element modeling of the locking hook, simplified finite element modeling of the base plate, and simplified finite element modeling of the ratchet.

[0008] C. Load-bearing capacity analysis settings and definitions for the lock hook, with load-bearing capacity settings for the X, Y, and Z directions respectively;

[0009] D. Data processing of load-bearing performance analysis results; the load-bearing capacity curves are F_U history curves in the X, Y, and Z directions.

[0010] E. Load-bearing performance evaluation and result post-processing;

[0011] F. Adjust the structural parameters and verify the load-bearing performance of the new parameters. After changing the design scheme, re-verify and evaluate.

[0012] Further, step A specifically includes the following steps:

[0013] A1. Create a node, copy the node, and move the node;

[0014] A2. In a plane with node 1# as the origin and line segments 1#-5# as the normal direction, create a circular line segment and fill the surface. The radius parameter of the circle is R.

[0015] A3. Divide the circular surface into quadrilateral grids in step A2. Starting from this grid, sweep along the sequentially established line segment groups as the trajectory to extract complete lock hook solid units, and display the generated lock hook solid units separately.

[0016] A4. Export the individually displayed hook units as an inp file and extract the script.

[0017] Furthermore, in step A, the nodes are moved by performing the following operations:

[0018] a. Copy point 1# and move it to generate point 2#, using the move parameter H;

[0019] b. Copy point 2# and move it to generate point 3#, using the move parameter W;

[0020] c. Copy and move point 2 to generate point 5, copy and move point 5 to generate point 6, copy and move point 6 to generate point 7, with a moving parameter of 10mm;

[0021] d. Copy and move point 3 to generate point 8, copy and move point 8 to generate point 9, copy and move point 9 to generate point 10, with a moving parameter of 10mm;

[0022] e. Establish line segment groups: 1#—5#; 5#—7#; 7#—10#; 10#—8#; 8#—4#;

[0023] In steps c and d, the movement parameter (10mm) is only the radius of the hook chamfer; the actual chamfer radius can be set according to the specific situation.

[0024] Further, step B specifically includes the following steps:

[0025] B1. Modeling platform;

[0026] B2, Finite element mesh of the locking hook;

[0027] B3. Simplified finite element modeling of the base plate;

[0028] B4. Simplified finite element modeling of ratchet;

[0029] B5. Overall finite element modeling.

[0030] Furthermore, step B specifically involves:

[0031] a. Establish a local coordinate system. The origin O of the local coordinate system is arbitrary, and the X, Y, and Z directions are as follows: Figure 1 As shown, the reference point is associated with N1, N2-X, N2-Y, and N2-Z;

[0032] b. Establish contact relationships between the riveting area between the lock hook and the base plate, and the locking contact area between the ratchet and the lock hook, and set the friction coefficient to 0.1;

[0033] c. Assign material properties to the hook, set the property using the *solid section keyword; set the material using the *material keyword, and assign the material's plastic stress-strain characteristics to the *plastic keyword parameter line.

[0034] Further, step C specifically includes the following steps:

[0035] C1. Calculation Type Characteristics

[0036] C2. Operating condition definition characteristics:

[0037] C3. Result Output Characteristics:

[0038] The C4, Y, and Z direction bearing capacity analysis settings and definitions are the same as steps C1 to C3 above.

[0039] Further, step D specifically includes the following steps:

[0040] D1. Read the history curve of support reaction force-chord length at the base reference point. The direction of support reaction force is the same as the direction of investigation.

[0041] D2. Read the displacement-chord length history curve of the ratchet reference point; the displacement direction is the same as the direction of investigation.

[0042] D3. Combine the curve histories from steps D1 and D2, eliminate the chord length coordinate axis, and obtain the load-bearing capacity F_U history curves of the lock hook in the X, Y, and Z directions.

[0043] Further, step E specifically includes the following steps: mainly assessing the stiffness failure and strength failure of the lock hook, and assessing the F_U history curve in step D according to the design performance target of the lock hook product.

[0044] Furthermore, step E specifically includes the following steps:

[0045] E1. Conduct a stiffness failure evaluation;

[0046] E2, Strength Failure Evaluation;

[0047] After evaluating E3, X, Y, and Z, the main optimization should be carried out in the direction that is most different from the design performance target of the locking hook. In practice, the specific direction can be determined according to the specific situation.

[0048] E4. Displacement investigation under deterministic load: After completing step D, based on the obtained load-bearing capacity F_U history curves of the lock hook in the X, Y, and Z directions, a given deterministic load can be applied to investigate the displacement in a certain direction after bearing the load.

[0049] Further, step F specifically includes the following steps:

[0050] F1. Change the parameter values ​​extracted in step A, including height, cross-sectional dimensions, and meshing position. Given the design parameter combination to be verified, double-click the batch format driver file command to generate a new mesh model.

[0051] F2. Repeat steps B, C, D, and E to verify the new solution.

[0052] Compared with the prior art, the beneficial effects of the present invention are:

[0053] This invention presents a parameter-driven simulation analysis method for the load-bearing performance of passenger car lock hook assemblies. This method is simple to define and quick to calculate, providing strong support for layout requirements during the product development stage. It can quickly verify the impact of different layout schemes on the load-bearing performance of the lock hook, including indicators such as stiffness, strength failure, and failure deformation during the load-bearing process. At the same time, it can predict various failure deformations of the structure under different load-bearing indicators, providing strong support for product design. Attached Figure Description

[0054] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 Finite element simulation was used to evaluate the load-bearing capacity of the locking hook in a specified direction.

[0056] Figure 2 Flowchart of the steps in the parameter-driven simulation analysis method for the load-bearing performance of passenger car lock hooks;

[0057] Figure 3 An overall diagram showing the completion of the automated modeling script with relevant parameters;

[0058] Figures 4-6 Load-bearing capacity F_U history curves of the locking hook in the X, Y, and Z directions. Detailed Implementation

[0059] The present invention will be further described below with reference to embodiments:

[0060] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0061] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0062] This invention provides a parameter-driven simulation analysis method for the load-bearing performance of passenger vehicle locking hooks. It enables rapid adjustment of key design parameters of the locking hook, such as height, cross-sectional dimensions, and engagement position, and allows for finite element simulation evaluation of the locking hook's load-bearing performance in a specified direction. Figure 1 As shown. Load-bearing capacity includes stiffness failure evaluation and strength failure evaluation. Stiffness failure is defined as the inflection point of the slope of the force-displacement curve in the corresponding direction of the lock hook, while strength failure is defined as the material reaching its tensile limit.

[0063] like Figure 2 As shown, the parameter-driven simulation analysis method for the load-bearing performance of passenger car lock hooks includes the following steps:

[0064] 1. Parameter extraction is involved in the parametric modeling and driving of the lock hook. In the HyperMesh preprocessing tool, the relevant parameter operations are performed, and the script is exported for parameter extraction. Specifically, this includes the following steps:

[0065] ① Create a node in Hypermesh, copy the node using the `duplicate` command, and move the node using the `translate` command. Perform the following operations respectively:

[0066] a. Copy point 1# and move it to generate point 2#, using the move parameter H;

[0067] b. Copy point 2# and move it to generate point 3#, using the move parameter W;

[0068] c. Copy and move point 2 to generate point 5, copy and move point 5 to generate point 6, copy and move point 6 to generate point 7, with a moving parameter of 10mm;

[0069] d. Copy and move point 3 to generate point 8, copy and move point 8 to generate point 9, copy and move point 9 to generate point 10, with a moving parameter of 10mm;

[0070] e. Establish line segment groups: 1#—5#; 5#—7#; 7#—10#; 10#—8#; 8#—4#.

[0071] In steps c and d, the movement parameter (10mm) is only the radius of the hook chamfer; the actual chamfer radius can be set according to the specific situation.

[0072] ② In HyperMesh, with node 1# as the origin and the direction of line segments 1#-5# as the normal, create a circular line segment and fill the surface. The radius parameter of the circle is R.

[0073] ③ Divide the circular surface into quadrilateral grids in step ②. Using this grid as the starting point for sweeping, use the line segment groups established in step ① and step e as the trajectory to sweep out the complete lock hook solid unit and display the generated lock hook solid unit separately.

[0074] ④ Export the individually displayed hook unit as an .inp file. Close the HyperMesh software and extract the command.cmf script for the above operations. Extract the corresponding commands from the script (corresponding to the values ​​in the *translate command for W and H parameters in step ①; and the values ​​in the *circle command for R parameter in step ②), and create a batch file as the driver executable.

[0075] The automated modeling script with relevant parameters has been created, and the overall diagram is as follows. Figure 3 As shown.

[0076] 2. Finite element modeling of the locking hook system, including three parts: finite element modeling of the locking hook, simplified finite element modeling of the base plate, and simplified finite element modeling of the ratchet.

[0077] ① Modeling platform:

[0078] The modeling work was completed using the Hypermesh preprocessing tool under the Abaqus template;

[0079] ② Finite element mesh of the locking hook:

[0080] The finite element mesh for the lock structure uses hexahedral elements, with element type C3D8.

[0081] ③ Simplified finite element modeling of the base plate:

[0082] The contact area between the hook and the base plate is constructed using rigid shell elements of type R3D4. A rigid region reference point N1 is established at the center of the two riveting areas of the hook. The keyword *rigid body is defined to connect the rigid shell model of the floor to the reference point N1. Load constraints will be set on point N1 subsequently.

[0083] The performance of the base plate is not considered here; only the performance of the locking hook is examined. Therefore, the riveting area of ​​the base plate is replaced with a rigid shell, which only needs to meet the riveting contact function.

[0084] ④ Simplified finite element modeling of ratchet:

[0085] The contact area between the ratchet and the locking hook is constructed using rigid shell elements of type R3D4. A rigid region reference point N2-X is established at the ratchet's rotation center. The keyword *rigid body is defined to connect the ratchet rigid shell model to the reference point N2-X. Load constraints will be set for point N2-X subsequently.

[0086] Following the above method, in Figure 1 Three contact models were established in the three directions, and three sets of reference points N2-X, N2-Y, and N2-Z were set.

[0087] ⑤ Overall finite element modeling:

[0088] a. Establish a local coordinate system. The origin O of the local coordinate system is arbitrary, and the X, Y, and Z directions are as follows: Figure 1 As shown, the reference point is associated with N1, N2-X, N2-Y, and N2-Z;

[0089] b. Establish contact relationships between the riveting area between the lock hook and the base plate, and the locking contact area between the ratchet and the lock hook, and set the friction coefficient to 0.1;

[0090] c. Assign material properties to the hook, set the property using the *solid section keyword; set the material using the *material keyword, and assign the material's plastic stress-strain characteristics to the *plastic keyword parameter line.

[0091] 3. Lock hook load-bearing capacity analysis settings and definitions, based on Figure 1 The load-bearing capacity is configured in the three design directions (X, Y, and Z) respectively, as follows:

[0092] ① Calculation type characteristics:

[0093] a. In the abaqus / standard template, set NLGEOM=YES for the *step keyword to enable nonlinear solution;

[0094] b. Set up *static analysis and set the risk parameter to select the chord length method for nonlinear analysis.

[0095] ② Operating condition definition characteristics:

[0096] a. Constraint characteristics:

[0097] Under the *boundary keyword, constrain the 1 to 6 degrees of freedom of point N1.

[0098] b. Load features, to Figure 1 Taking the verification of the X-direction design as an example:

[0099] In the *boundary keyword, define the forced displacement of point N2-X (the x-direction translation of the local coordinate system) as 300mm. The forced displacement can be set to a large value. During the calculation of the failure state of the risk chord method model, it will fail to converge at a certain time. Afterwards, only the results before the failure point need to be considered.

[0100] ③ Result output characteristics:

[0101] a. S and PEEQ in the output element result index (*element output), namely stress and plastic strain.

[0102] b. U and RF in the output node result index (*node output) are displacement and constraint reaction forces, respectively.

[0103] ⑤ The load-bearing capacity analysis settings and definitions for other directions (Y and Z directions) are the same as those in steps ① to ④ above.

[0104] 4. Load-bearing performance analysis results data processing: The load-bearing capacity curve is the F_U history curve in the X, Y, and Z directions, and its characteristics are as follows:

[0105] ① Read the support reaction force-chord length history curve at the base reference point (N1). The direction of the support reaction force is the same as the direction of investigation.

[0106] ② Read the displacement-chord length history curve of the ratchet reference point (N2-X, N2-Y, N2-Z), with the displacement direction being the same as the direction of investigation;

[0107] ③ Combine the curve histories from steps ① and ②, eliminate the chord length coordinate axis, and obtain the load-bearing capacity F_U histories of the lock hook in the X, Y, and Z directions, as shown below. Figures 4-6 As shown;

[0108] 5. Load-bearing performance evaluation and result post-processing, mainly assessing the stiffness and strength failure of the locking hook. Based on the design performance targets of the locking hook product, the F_U history curve from step 4 is evaluated. Figure 4 Its characteristics are:

[0109] ① First, conduct a stiffness failure evaluation:

[0110] The point of abrupt change in the slope of the F_U process curve. Figure 4The figure shows the stiffness failure point. If the bearing capacity corresponding to the stiffness failure point is less than the design bearing capacity, the hook bearing capacity is not up to standard; if the bearing capacity corresponding to the stiffness failure point is greater than the design bearing capacity, the strength failure situation corresponding to the design bearing capacity should be examined.

[0111] ② Second, strength failure evaluation:

[0112] Based on the above-mentioned points of investigation, and according to the curve in step 4, step ①, find the chord length coordinates and retrieve the strength results (stress, strain) under the corresponding chord length coordinates.

[0113] Evaluate whether the strain in a local area of ​​the structure is less than the strain corresponding to the ultimate tensile strength. If the structural strain is less than the ultimate tensile strength strain of the material, the load-bearing capacity of the locking hook meets the requirements (both stiffness and strength are satisfied); if the structural strain is greater than the ultimate tensile strength strain of the material, the load-bearing capacity of the locking hook does not meet the requirements. Parameters can be adjusted appropriately, and step 6 can be executed.

[0114] ③ After evaluating X, Y, and Z, the main optimization should be carried out in the direction that is most different from the design performance target of the locking hook. In practice, it can be determined according to the specific situation. For example, if the load-bearing capacity of the locking direction is the main focus, then the load-bearing performance should be optimized in the design direction of the most concern.

[0115] ④ Displacement investigation under deterministic load: After completing step 4, based on the obtained load-bearing capacity F_U history curves of the lock hook in the X, Y, and Z directions, a given deterministic load can be applied to investigate the displacement in a certain direction after bearing the load.

[0116] 6. Adjust the structural parameters and verify the load-bearing capacity of the new parameters. After revising the design scheme, conduct a re-verification and evaluation, specifically as follows:

[0117] ① Change the parameter values ​​extracted in step 1, including height, cross-sectional dimensions, and meshing position. Given the design parameter combination that needs to be verified, double-click the batch format driver file command to generate a new mesh model.

[0118] ② Repeat steps 2, 3, 4 and 5 to verify the new solution.

[0119] Example 1

[0120] A certain lock hook has H=45mm, W=27mm, and R=3.5. What are the corresponding parameters for... Figure 1 The design targets for load-bearing capacity in the local coordinate X, Y, and Z directions are ≥9000N, ≥9000N, and ≥11000N, respectively. After generating the mesh model, as follows... Figure 1 As shown. Bearing performance conditions are defined for the X, Y, and Z directions, resulting in the bearing performance curves as shown. Figures 4-6The simulation results of the model failure load magnitudes are approximately 7200N in the X direction, approximately 4600N in the Y direction, and approximately 15000N in the Z direction. Among them, the bearing capacity in the X and Y directions did not reach the design target values.

[0121] The design loads in the X and Y directions are given as 2.94 kN and 9 kN respectively. The results are as follows:

[0122] ① When 2.94KN is applied in the X and Y directions respectively, the displacements of the locking hooks are 0.41mm and 0.57mm respectively;

[0123] ② When 9KN is applied in the X and Y directions respectively, the displacement of the locking hook is 4.01mm and 13.85mm respectively.

[0124] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A parameter-driven simulation analysis method for the load-bearing performance of passenger car locking hooks, characterized in that, Includes the following steps: A. Parametric modeling and driving of the locking hook involves parameter extraction; B. Finite element modeling of the locking hook system, which includes three parts: finite element modeling of the locking hook, simplified finite element modeling of the base plate, and simplified finite element modeling of the ratchet. C. Load-bearing capacity analysis settings and definitions for the lock hook, with load-bearing capacity settings for the X, Y, and Z directions respectively; D. Data processing of load-bearing performance analysis results; the load-bearing capacity curves are F_U history curves in the X, Y, and Z directions. E. Load-bearing performance evaluation and result post-processing; F. Adjust the structural parameters and verify the load-bearing performance of the new parameters. After changing the design scheme, re-verify and evaluate. Step D specifically includes the following steps: D1. Read the history curve of support reaction force-chord length at the base reference point. The direction of support reaction force is the same as the direction of investigation. D2. Read the displacement-chord length history curve of the ratchet reference point; the displacement direction is the same as the direction of investigation. D3. Combine the curve histories from steps D1 and D2, eliminate the chord length coordinate axis, and obtain the F_U history curve of the load-bearing capacity in the X, Y, and Z directions of the lock hook. Step E specifically includes the following steps: mainly assessing the stiffness failure and strength failure of the lock hook, and assessing the F_U history curve in step D according to the design performance target of the lock hook product; Step E specifically includes the following steps: E1. Conduct a stiffness failure evaluation; E2, Strength Failure Evaluation; After evaluating E3, X, Y, and Z, the main optimization should be carried out in the direction that is most different from the design performance target of the locking hook. E4. Displacement investigation under deterministic load: After completing step D, based on the obtained F_U history curves of the load-bearing capacity of the lock hook in the X, Y, and Z directions, a given deterministic load is applied, and the displacement in a certain direction after bearing the load is investigated. Step F specifically includes the following steps: F1. Change the parameter values ​​extracted in step A, including height, cross-sectional dimensions, and meshing position. Given the design parameter combination to be verified, double-click the batch format driver file command to generate a new mesh model. F2. Repeat steps B, C, D, and E to verify the new solution.

2. The parameter-driven simulation analysis method for the load-bearing performance of passenger car locking hooks according to claim 1, characterized in that, Step A specifically includes the following steps: A1. Create a node, copy the node, and move the node; A2. In a plane with node 1# as the origin and line segments 1#-5# as the normal direction, create a circular line segment and fill the surface. The radius parameter of the circle is R. A3. Divide the circular surface into quadrilateral grids in step A2. Starting from this grid, sweep along the sequentially established line segment groups as the trajectory to extract complete lock hook solid units, and display the generated lock hook solid units separately. A4. Export the individually displayed hook units as an inp file and extract the script.

3. The method for simulation analysis of the load-bearing performance of passenger car locking hooks based on parameter-driven principles according to claim 2, characterized in that, Step A: Move the node by performing the following operations: a. Copy point 1# and move it to generate point 2#, using the move parameter H; b. Copy point 2# and move it to generate point 3#, using the move parameter W; c. Copy and move point 2 to generate point 5, copy and move point 5 to generate point 6, copy and move point 6 to generate point 7, with a moving parameter of 10mm; d. Copy and move point 3 to generate point 8, copy and move point 8 to generate point 9, copy and move point 9 to generate point 10, with a moving parameter of 10mm; e. Establish line segment groups: 1#—5#; 5#—7#; 7#—10#; 10#—8#; 8#—4#; In steps c and d, the 10mm movement parameter is only the radius of the hook chamfer.

4. The parameter-driven simulation analysis method for the load-bearing performance of passenger car locking hooks according to claim 1, characterized in that, Step B specifically includes the following steps: B1. Modeling platform; B2, Finite element mesh of the locking hook; B3. Simplified finite element modeling of the base plate; B4. Simplified finite element modeling of ratchet; B5. Overall finite element modeling.

5. The parameter-driven simulation analysis method for the load-bearing performance of passenger car locking hooks according to claim 4, characterized in that, Step B, specifically: a. Establish a local coordinate system. The origin O of the local coordinate system is arbitrary. Associate the reference point with N1, N2-X, N2-Y, and N2-Z. b. Establish contact relationships between the riveting area between the lock hook and the base plate, and the locking contact area between the ratchet and the lock hook, and set the friction coefficient to 0.1; c. Assign material properties to the hook and set the property using the *solid section keyword; Set the material keyword *material and assign the material plastic stress-strain properties to the *plastic keyword parameter line.

6. The method for simulation analysis of the load-bearing performance of passenger car locking hooks based on parameter-driven principles according to claim 1, characterized in that, Step C specifically includes the following steps: C1. Calculation Type Characteristics C2. Operating condition definition characteristics: C3. Result Output Characteristics: The C4, Y, and Z direction bearing capacity analysis settings and definitions are the same as steps C1 to C3 above.

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