Door hinge strength modeling method, system, device and computer-readable storage medium

Abstract

A door hinge strength modeling method, system, device, and computer-readable storage medium, relating to the field of automotive computer-aided engineering, includes establishing a target finite element model comprising a door-end hinge, a body-end hinge, a bushing, and a pin, wherein the contact between the pin and the body-end hinge, the contact between the pin and the bushing, and the contact between the bushing and the body-end hinge are surface-to-surface; determining a first plastic strain value corresponding to the body-end hinge, door-end hinge, and pin in the target finite element model under longitudinal conditions based on a preset bolt preload and a preset longitudinal load; determining a second plastic strain value corresponding to the body-end hinge, door-end hinge, and pin in the target finite element model under transverse conditions based on a preset bolt preload and a preset transverse load; and determining the door hinge strength acceptance based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value. This application solves the problem of strain result distortion and improves the accuracy of door hinge strength determination results.

Description

Technical Field

[0001] The present application relates to the field of automotive CAE (Computer-Aided Engineering) research, and specifically to a door hinge strength modeling method, system, device, and computer-readable storage medium. Background Art

[0002] As the automotive industry increases its requirements for vehicle safety and durability, the strength assessment of door hinges has become increasingly important. Currently, in the field of finite element analysis, refined modeling and analysis methods have become an important means of evaluating the strength of door hinges.

[0003] However, existing technologies typically use rigid or beam elements to model hinge pins and bolt connections. However, the stress concentration caused by using rigid elements can distort strain results, leading to low accuracy in determining door hinge strength. Therefore, developing a door hinge strength modeling method to improve the accuracy of door hinge strength determination is an urgent issue. Summary of the Invention

[0004] The present application provides a door hinge strength modeling method, system, device and computer-readable storage medium, which can solve the technical problem in the prior art that stress concentration caused by the use of rigid unit modeling leads to distorted strain results.

[0005] In a first aspect, an embodiment of the present application provides a door hinge strength modeling method, the door hinge strength modeling method comprising:

[0006] Establish a target finite element model including the door end hinge, the body end hinge, the shaft sleeve, and the pin, wherein the contact between the pin and the body end hinge, the contact between the pin and the shaft sleeve, and the contact between the shaft sleeve and the body end hinge are all surface-to-surface contacts;

[0007] Determining a first plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a longitudinal working condition based on a preset bolt preload and a preset longitudinal load;

[0008] Determining a second plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a lateral working condition based on a preset bolt preload and a preset lateral load;

[0009] The eligibility of the door hinge strength is determined based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value.

[0010] In combination with the first aspect, in one embodiment, the body end hinge is connected to a first fixture, and the door end hinge is connected to a second fixture. The first target constraint corresponding to the first fixture includes a translation constraint along the X-axis, a translation constraint along the Y-axis, a translation constraint along the Z-axis, a rotation constraint around the X-axis, a rotation constraint around the Y-axis, and a rotation constraint around the Z-axis. The second target constraint corresponding to the second fixture includes a translation constraint along the Z-axis, a rotation constraint around the X-axis, a rotation constraint around the Y-axis, and a rotation constraint around the Z-axis.

[0011] In conjunction with the first aspect, in one embodiment, determining, based on a preset bolt preload and a preset longitudinal load, first plastic strain values ​​corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under the longitudinal working condition includes:

[0012] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result;

[0013] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset longitudinal load to obtain a second analysis result;

[0014] Based on the second analysis result, first plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

[0015] In conjunction with the first aspect, in one embodiment, determining, based on a preset bolt preload and a preset lateral load, a second plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under the lateral working condition includes:

[0016] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result;

[0017] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset lateral load to obtain a third analysis result;

[0018] Based on the third analysis result, second plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

[0019] In combination with the first aspect, in one embodiment, determining the eligibility of the door hinge strength based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value includes:

[0020] When the first plastic strain value is less than or equal to a preset target plastic strain value and the second plastic strain value is less than or equal to a preset target plastic strain value, it is determined that the door hinge strength is qualified;

[0021] When the first plastic strain value is greater than a preset target plastic strain value or the second plastic strain value is greater than a preset target plastic strain value, it is determined that the door hinge strength is unqualified.

[0022] In a second aspect, an embodiment of the present application provides a door hinge strength modeling system, the door hinge strength modeling system comprising:

[0023] A first processing module is used to establish a target finite element model including a door end hinge, a body end hinge, a shaft sleeve, and a pin, wherein the contact between the pin and the body end hinge, the contact between the pin and the shaft sleeve, and the contact between the shaft sleeve and the body end hinge are all surface-to-surface contacts;

[0024] a second processing module configured to determine, based on a preset bolt preload and a preset longitudinal load, a first plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a longitudinal working condition;

[0025] a third processing module, configured to determine, based on a preset bolt preload and a preset lateral load, a second plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a lateral working condition;

[0026] A fourth processing module is configured to determine the eligibility of the door hinge strength based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value.

[0027] In combination with the second aspect, in one embodiment, the body end hinge is connected to a first fixture, and the door end hinge is connected to a second fixture. The first target constraint corresponding to the first fixture includes a translation constraint along the X-axis, a translation constraint along the Y-axis, a translation constraint along the Z-axis, a rotation constraint around the X-axis, a rotation constraint around the Y-axis, and a rotation constraint around the Z-axis. The second target constraint corresponding to the second fixture includes a translation constraint along the Z-axis, a rotation constraint around the X-axis, a rotation constraint around the Y-axis, and a rotation constraint around the Z-axis.

[0028] In conjunction with the second aspect, in one embodiment, the second processing module is specifically configured to:

[0029] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result;

[0030] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset longitudinal load to obtain a second analysis result;

[0031] Based on the second analysis result, first plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

[0032] In a third aspect, an embodiment of the present application provides a door hinge strength modeling device, which includes a processor, a memory, and a door hinge strength modeling program stored in the memory and executable by the processor, wherein when the door hinge strength modeling program is executed by the processor, the steps of the door hinge strength modeling method described in any of the above items are implemented.

[0033] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a door hinge strength modeling program is stored, wherein when the door hinge strength modeling program is executed by a processor, the steps of the door hinge strength modeling method as described in any of the above items are implemented.

[0034] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0035] By establishing a finite element model and accurately setting the surface-to-surface contact conditions between the pin, the body-end hinge, and the bushing, the interaction and pressure distribution between the components can be more realistically reflected, effectively alleviating the problem of stress concentration and avoiding distortion of the strain results; the plastic strain values ​​corresponding to the body-end hinge, the door-end hinge, and the pin in the finite element model are calculated based on the preset bolt preload and load (including longitudinal and lateral), which can more realistically simulate the stress and strain distribution of each component under different working conditions, and then determine the door hinge strength based on the relationship between the first plastic strain value, the second plastic strain value, and the target plastic strain value. This application effectively solves the stress concentration problem caused by traditional rigid unit or beam unit simulation, avoids distortion of strain results, and significantly improves the accuracy of the door hinge strength determination results. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of an embodiment of a door hinge strength modeling method of the present application;

[0037] Figure 2 This is a schematic diagram of CATIA model data for an embodiment of the door hinge strength modeling method of the present application;

[0038] Figure 3 A schematic diagram of the hinge assembly structure of an embodiment of the door hinge strength modeling method of the present application;

[0039] Figure 4 This is a schematic diagram of the architecture of an embodiment of a door hinge strength modeling system of the present application;

[0040] Figure 5 This is a schematic diagram of the hardware structure of the door hinge strength modeling device involved in the embodiment of the present application.

[0041] In the figure: 1. Upper hinge assembly; 2. Lower hinge assembly; 3. First fixture; 4. Second fixture; 5. Door end hinge; 6. Body end hinge; 7. Bushing; 8. Pin. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0044] In a first aspect, an embodiment of the present application provides a door hinge strength modeling method.

[0045] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of the door hinge strength modeling method of this application. Figure 1 As shown in Figure 2, the door hinge strength modeling method includes:

[0046] Step S10: Establish a target finite element model including the door end hinge, the body end hinge, the bushing, and the pin, wherein the contact between the pin and the body end hinge, the contact between the pin and the bushing, and the contact between the bushing and the body end hinge are all surface-to-surface contacts.

[0047] For example, in the embodiment of the present application, the hinge assembly CATIA model data is imported (CATIA is a professional three-dimensional computer-aided design CAD, computer-aided manufacturing CAM and computer-aided engineering CAE software, commonly used in engineering design and manufacturing processes), and the hinge assembly CATIA model data is imported. Figure 2 and Figure 3As shown, the model data includes: upper hinge assembly 1, lower hinge assembly 2, first fixture 3, second fixture 4, door hinge 5, body hinge 6, bushing 7, and pin 8. The contact between pin 8 and body hinge 6, the contact between pin 8 and bushing 7, and the contact between bushing 7 and body hinge 6 are all set to surface-to-surface contact.

[0048] Specifically, a target finite element model of the door hinge 5, body hinge 6, bushing 7, and pin 8 was established based on the CATIA model data. In this embodiment, to simulate the fully closed state of the vehicle door, the hinge installation posture was based on the hinge centerline, and the hinge spacing was adjusted so that the outer end distance between the upper hinge assembly 1 and the lower hinge assembly 2 was preferably 406 mm ± 4 mm.

[0049] It can be understood that the door end hinge 5 and the body end hinge 6 can be divided into grids with an average grid size of 2mm-5mm according to the complexity of the structural characteristics. The grid units are hexahedral units and pentahedral units. The hinge ensures no less than 3 layers of grid units in the thickness direction of the part. The grid size of the bushing 7 and the pin 8 is consistent with the hinge. The grid units are also hexahedral units and pentahedral units. The fitting surface between the bushing 7 and the door end hinge 5 adopts node fusion connection.

[0050] Step S20: Determine a first plastic strain value corresponding to the body end hinge, door end hinge, and pin in the target finite element model under the longitudinal working condition based on a preset bolt preload and a preset longitudinal load.

[0051] For example, in the embodiment of the present application, the plastic strain values ​​include the values ​​of six components: the upper body-end hinge, the upper door-end hinge, the upper pin, the lower body-end hinge, the lower door-end hinge, and the lower pin. The specific values ​​of the preset bolt preload and the preset longitudinal load can be determined according to actual needs and are not limited here. The preset longitudinal load is preferably 11,000 N. Specifically, the body-end hinge is connected to a first fixture, and the door-end hinge is connected to a second fixture. After the degrees of freedom are constrained on the first and second fixtures, a preload section is created and a bolt preload is applied to the preload section, and a longitudinal load is applied to the second fixture. A nonlinear finite element analysis is then performed based on the degrees of freedom constraints and the applied bolt preload to obtain a first analysis result. A nonlinear finite element analysis is then performed based on the first analysis result and the longitudinal load to obtain a second analysis result. The first plastic strain value can be obtained by extracting the maximum values ​​of the body-end hinge, door-end hinge, and pin corresponding to the second analysis result using finite element software.

[0052] Step S30: Determine a second plastic strain value corresponding to the body end hinge, door end hinge, and pin in the target finite element model under the lateral working condition based on the preset bolt preload and the preset lateral load.

[0053] For example, in the embodiment of the present application, the preset lateral load can be determined based on actual needs and is not limited here; the preset longitudinal load is preferably 9000 N. After the degrees of freedom are constrained on the first and second fixtures, a preload section is created and a bolt preload force is applied to the preload section, and a lateral load is applied to the second fixture. A nonlinear finite element analysis is then performed based on the degrees of freedom constraints and the applied bolt preload force to obtain a first analysis result. A nonlinear finite element analysis is then performed based on the first analysis result and the lateral load to obtain a third analysis result. The second plastic strain value can be obtained by extracting the maximum values ​​of the corresponding body-end hinge, door-end hinge, and pin in the third analysis result using finite element software.

[0054] Step S40: Determine the eligibility of the door hinge strength based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value.

[0055] For example, in the embodiment of the present application, the preset target plastic strain values ​​can be determined based on actual needs and are not limited herein. For example, the target plastic strain values ​​for the upper body hinge are 20%, the target plastic strain values ​​for the upper door hinge are 20%, the target plastic strain values ​​for the upper pin are 15%, the target plastic strain values ​​for the lower body hinge are 20%, the target plastic strain values ​​for the lower door hinge are 20%, and the target plastic strain value for the lower pin is 15%. Specifically, the door hinge strength qualification is determined based on the relationship between the first and second plastic strain values ​​corresponding to each component and the target plastic strain values.

[0056] In this embodiment, by establishing a finite element model and accurately setting the surface-to-surface contact conditions between the pin, the body-end hinge, and the bushing, the interaction and pressure distribution between the components can be more realistically reflected, effectively alleviating the problem of stress concentration and avoiding distortion of the strain results; the plastic strain values ​​corresponding to the body-end hinge, the door-end hinge, and the pin in the finite element model are calculated based on the preset bolt preload and load (including longitudinal and transverse), which can more realistically simulate the stress and strain distribution of each component under different working conditions, and then determine the door hinge strength based on the relationship between the first plastic strain value, the second plastic strain value, and the target plastic strain value. This application effectively solves the stress concentration problem caused by traditional rigid unit or beam unit simulation, avoids distortion of strain results, and significantly improves the accuracy of the door hinge strength determination results.

[0057] Furthermore, in one embodiment, the body end hinge is connected to a first fixture, and the door end hinge is connected to a second fixture. The first target constraint corresponding to the first fixture includes a translation constraint along the X-axis, a translation constraint along the Y-axis, a translation constraint along the Z-axis, a rotation constraint around the X-axis, a rotation constraint around the Y-axis, and a rotation constraint around the Z-axis. The second target constraint corresponding to the second fixture includes a translation constraint along the Z-axis, a rotation constraint around the X-axis, a rotation constraint around the Y-axis, and a rotation constraint around the Z-axis.

[0058] For example, in an embodiment of the present application, a mesh model of the first fixture corresponding to the body end hinge and a mesh model of the second fixture corresponding to the door end hinge are established, and the average mesh size of the two is 5 mm; a nonlinear material model of the hinge is created, and corresponding material parameters are assigned according to the material grade of each part, and the first fixture and the second fixture are set to non-deformable rigid materials.

[0059] Specifically, the first target constraint condition corresponding to the first fixture includes constraints of 6 degrees of freedom, namely, degree of freedom 1 (translation along the X-axis), degree of freedom 2 (translation along the Y-axis), degree of freedom 3 (translation along the Z-axis), degree of freedom 4 (rotation around the X-axis), degree of freedom 5 (rotation around the Y-axis), and degree of freedom 6 (rotation around the Z-axis); the second target constraint condition corresponding to the second fixture includes constraints of 4 degrees of freedom, namely, degree of freedom 3, degree of freedom 4, degree of freedom 5, and degree of freedom 6.

[0060] It should be noted that the hinge and the fixture are connected by bolts. In the finite element model, the bolts are divided into hexahedral and pentahedral grids, and the grid size is equivalent to the hinge grid size. When each bolt and hinge are connected to the fixture, the bolt side contact surface is set as the slave surface, and the hinge and fixture contact surface is set as the master surface, and surface-to-surface contact is established between the master surface and the slave surface.

[0061] Furthermore, in one embodiment, determining the first plastic strain values ​​corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under the longitudinal working condition based on the preset bolt preload and the preset longitudinal load includes:

[0062] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result;

[0063] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset longitudinal load to obtain a second analysis result;

[0064] Based on the second analysis result, first plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

[0065] Exemplarily, in an embodiment of the present application, a nonlinear finite element analysis is performed on the body-end hinge, door-end hinge and pin shaft according to the first target constraint condition, the second target constraint condition and the applied bolt preload, and the plastic strain values ​​corresponding to the body-end hinge, door-end hinge and pin shaft (i.e., the first analysis result) are obtained; then a nonlinear finite element analysis is performed on the body-end hinge, door-end hinge and pin shaft according to the first analysis result, the first target constraint condition, the second target constraint condition and the longitudinal load, and the second analysis result is obtained; the maximum values ​​of the body-end hinge, door-end hinge and pin shaft corresponding to the second analysis result can be extracted by finite element software to obtain the first plastic strain value.

[0066] Specifically, the longitudinal load strength finite element model constraints, loading settings, and load analysis are as follows:

[0067] Constraint M: The degree of freedom of the fixture constraining the body end hinge is 123456, and the degree of freedom of the fixture constraining the door end hinge is 3456.

[0068] Loading N1: Create a preload section Surface at any position of the bolt screw, perpendicular to the bolt, and apply the bolt preload force on the preload section.

[0069] Load N2: Apply a load of 11000N to the fixture of the door end hinge in the longitudinal direction of the vehicle. The load should be equidistant between the linear centers of the hinge pin joints and pass through the center line of the hinge pin in the longitudinal direction of the vehicle.

[0070] Create a load analysis: In the first step, select constraint M and load N1 to create a bolt preload analysis to obtain the first analysis result. In the second step, combine the first analysis result, constraint M, and load N2 to create a longitudinal load analysis to obtain the second analysis result.

[0071] Furthermore, in one embodiment, determining the second plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under the lateral working condition based on the preset bolt preload and the preset lateral load includes:

[0072] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result;

[0073] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset lateral load to obtain a third analysis result;

[0074] Based on the third analysis result, second plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

[0075] Exemplarily, in an embodiment of the present application, a nonlinear finite element analysis is performed on the body-end hinge, door-end hinge and pin shaft according to the first target constraint condition, the second target constraint condition and the applied bolt preload, and the plastic strain values ​​corresponding to the body-end hinge, door-end hinge and pin shaft (i.e., the first analysis result) are obtained; then a nonlinear finite element analysis is performed on the body-end hinge, door-end hinge and pin shaft according to the first analysis result, the first target constraint condition, the second target constraint condition and the longitudinal load, and a third analysis result is obtained; the maximum values ​​of the body-end hinge, door-end hinge and pin shaft corresponding to the third analysis result can be extracted by finite element software to obtain the second plastic strain value.

[0076] Specifically, the lateral load strength finite element model constraints, loading settings, and load analysis are as follows:

[0077] Constraint M: The degree of freedom of the fixture constraining the body end hinge is 123456, and the degree of freedom of the fixture constraining the door end hinge is 3456.

[0078] Loading N1: Create a preload section Surface at any position of the bolt screw, perpendicular to the bolt, and apply the bolt preload force on the preload section.

[0079] Loading Q1: Apply a 9000N load to the fixture of the door end hinge in the transverse direction of the vehicle. The load should be equidistant between the linear centers of the hinge pin joints and pass through the centerline of the hinge pin in the transverse direction of the vehicle.

[0080] Create a load analysis: In the first step, select constraint M and load N1 to create a bolt preload analysis to obtain the first analysis result. In the second step, combine the first analysis result, constraint M, and load Q1 to create a longitudinal load analysis to obtain the third analysis result.

[0081] Furthermore, in one embodiment, determining the eligibility of the door hinge strength based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value includes:

[0082] When the first plastic strain value is less than or equal to a preset target plastic strain value and the second plastic strain value is less than or equal to a preset target plastic strain value, it is determined that the door hinge strength is qualified;

[0083] When the first plastic strain value is greater than a preset target plastic strain value or the second plastic strain value is greater than a preset target plastic strain value, it is determined that the door hinge strength is unqualified.

[0084] For example, in an embodiment of the present application, when the first plastic strain value corresponding to the body-end hinge, the door-end hinge and the pin shaft (i.e., the plastic strain value under the longitudinal working condition) is less than or equal to the target plastic strain value and the second plastic strain value corresponding to the body-end hinge, the door-end hinge and the pin shaft (i.e., the plastic strain value under the transverse working condition) is less than or equal to the target plastic strain value, it means that the design of the above-mentioned components meets the requirements, and the door hinge strength is determined to be qualified; when the first plastic strain value corresponding to the body-end hinge, the door-end hinge and the pin shaft is greater than the target plastic strain value and the second plastic strain value corresponding to the body-end hinge, the door-end hinge and the pin shaft is greater than the target plastic strain value, it means that at least one of the designs of the above-mentioned components does not meet the requirements, and the door hinge strength is determined to be unqualified.

[0085] Specifically, the result judgment is described using a set of body end hinge, door end hinge and pin data as an example:

[0086] Table 1 Result determination under longitudinal and transverse working conditions

[0087]

[0088]

[0089] As can be understood, referring to Table 1, assuming the target plastic strain value for the upper body hinge is 20%, if the plastic strain value of the upper body hinge under longitudinal conditions is 22% and the plastic strain value under lateral conditions is 10%, the result is NG (Not Good). If the plastic strain value of the upper door hinge under longitudinal conditions is 14% and the plastic strain value under lateral conditions is 8%, the result is OK (Qualified). The qualification determination method for the remaining components is the same as that for the upper body hinge and upper door hinge, and is not further explained here.

[0090] In a second aspect, an embodiment of the present application also provides a door hinge strength modeling system.

[0091] In one embodiment, referring to Figure 4 , Figure 4 This is a functional module diagram of an embodiment of the door hinge strength modeling system of this application. Figure 4 As shown, the door hinge strength modeling system includes:

[0092] A first processing module is used to establish a target finite element model including a door end hinge, a body end hinge, a shaft sleeve, and a pin, wherein the contact between the pin and the body end hinge, the contact between the pin and the shaft sleeve, and the contact between the shaft sleeve and the body end hinge are all surface-to-surface contacts;

[0093] a second processing module configured to determine, based on a preset bolt preload and a preset longitudinal load, a first plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a longitudinal working condition;

[0094] a third processing module, configured to determine, based on a preset bolt preload and a preset lateral load, a second plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a lateral working condition;

[0095] A fourth processing module is configured to determine the eligibility of the door hinge strength based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value.

[0096] Furthermore, in one embodiment, the body end hinge is connected to a first fixture, and the door end hinge is connected to a second fixture. The first target constraint corresponding to the first fixture includes a translation constraint along the X-axis, a translation constraint along the Y-axis, a translation constraint along the Z-axis, a rotation constraint around the X-axis, a rotation constraint around the Y-axis, and a rotation constraint around the Z-axis. The second target constraint corresponding to the second fixture includes a translation constraint along the Z-axis, a rotation constraint around the X-axis, a rotation constraint around the Y-axis, and a rotation constraint around the Z-axis.

[0097] Furthermore, in one embodiment, the second processing module is specifically configured to:

[0098] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result;

[0099] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset longitudinal load to obtain a second analysis result;

[0100] Based on the second analysis result, first plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

[0101] Furthermore, in one embodiment, the third processing module is specifically configured to:

[0102] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result;

[0103] performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset lateral load to obtain a third analysis result;

[0104] Based on the third analysis result, second plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

[0105] Furthermore, in one embodiment, the fourth processing module is specifically configured to:

[0106] When the first plastic strain value is less than or equal to a preset target plastic strain value and the second plastic strain value is less than or equal to a preset target plastic strain value, it is determined that the door hinge strength is qualified;

[0107] When the first plastic strain value is greater than a preset target plastic strain value or the second plastic strain value is greater than a preset target plastic strain value, it is determined that the door hinge strength is unqualified.

[0108] In this embodiment, by establishing a finite element model and accurately setting the surface-to-surface contact conditions between the pin, the body-end hinge, and the bushing, the interaction and pressure distribution between the components can be more realistically reflected, effectively alleviating the problem of stress concentration and avoiding distortion of the strain results; the plastic strain values ​​corresponding to the body-end hinge, the door-end hinge, and the pin in the finite element model are calculated based on the preset bolt preload and load (including longitudinal and transverse), which can more realistically simulate the stress and strain distribution of each component under different working conditions, and then determine the door hinge strength based on the relationship between the first plastic strain value, the second plastic strain value, and the target plastic strain value. This application effectively solves the stress concentration problem caused by traditional rigid unit or beam unit simulation, avoids distortion of strain results, and significantly improves the accuracy of the door hinge strength determination results.

[0109] Among them, the functional implementation of each module in the above-mentioned door hinge strength modeling system corresponds to the various steps in the above-mentioned door hinge strength modeling method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0110] On the third aspect, an embodiment of the present application provides a door hinge strength modeling device, which can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0111] Reference Figure 5, Figure 5 Schematic diagram of the hardware structure of the door hinge strength modeling device involved in the embodiment of the present application. In the embodiment of the present application, the door hinge strength modeling device may include a processor, a memory, a communication interface and a communication bus.

[0112] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0113] Communication interfaces include input / output (I / O) interfaces, physical interfaces, and logical interfaces, which interconnect components within the door hinge strength modeling device and connect the device to other devices (such as other computing devices or user devices). Physical interfaces can include Ethernet, fiber, or ATM interfaces; user devices can include displays and keyboards.

[0114] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0115] The processor may be a general-purpose processor that can call a door hinge strength modeling program stored in a memory and execute the door hinge strength modeling method provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the door hinge strength modeling program is called can be referenced to the various embodiments of the door hinge strength modeling method of the present application and will not be further described here.

[0116] Those skilled in the art will understand that Figure 5 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0117] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0118] The readable storage medium of the present application stores a door hinge strength modeling program, wherein when the door hinge strength modeling program is executed by a processor, the steps of the door hinge strength modeling method as described above are implemented.

[0119] Among them, the method implemented when the door hinge strength modeling program is executed can refer to the various embodiments of the door hinge strength modeling method of this application, and will not be repeated here.

[0120] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0121] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0122] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0123] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0124] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0125] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0126] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A door hinge strength modeling method, characterized in that: The door hinge strength modeling method includes: Establish a target finite element model including the door end hinge, the body end hinge, the bushing, and the pin, wherein the contact between the pin and the body end hinge, the contact between the pin and the bushing, and the contact between the bushing and the body end hinge are all surface-to-surface contacts; Determining a first plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a longitudinal working condition based on a preset bolt preload and a preset longitudinal load; Determining a second plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a lateral working condition based on a preset bolt preload and a preset lateral load; determining the eligibility of the door hinge strength based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value; The vehicle body end hinge is connected to a first fixture, and the door end hinge is connected to a second fixture. The first target constraint corresponding to the first fixture includes a translation constraint along the X axis, a translation constraint along the Y axis, a translation constraint along the Z axis, a rotation constraint around the X axis, a rotation constraint around the Y axis, and a rotation constraint around the Z axis. The second target constraint corresponding to the second fixture includes a translation constraint along the Z axis, a rotation constraint around the X axis, a rotation constraint around the Y axis, and a rotation constraint around the Z axis. The determining of the first plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model under the longitudinal working condition based on the preset bolt preload and the preset longitudinal load includes: performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result; performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset longitudinal load to obtain a second analysis result; Based on the second analysis result, first plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

2. The door hinge strength modeling method according to claim 1, characterized in that: The determining of the second plastic strain value corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model under the lateral working condition based on the preset bolt preload and the preset lateral load includes: performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result; performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset lateral load to obtain a third analysis result; Based on the third analysis result, second plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

3. The door hinge strength modeling method according to claim 1, characterized in that: The determining the eligibility of the door hinge strength based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value includes: When the first plastic strain value is less than or equal to a preset target plastic strain value and the second plastic strain value is less than or equal to a preset target plastic strain value, it is determined that the door hinge strength is qualified; When the first plastic strain value is greater than a preset target plastic strain value or the second plastic strain value is greater than a preset target plastic strain value, it is determined that the door hinge strength is unqualified.

4. A door hinge strength modeling system, characterized in that: The door hinge strength modeling system includes: A first processing module is used to establish a target finite element model including a door end hinge, a body end hinge, a shaft sleeve, and a pin, wherein the contact between the pin and the body end hinge, the contact between the pin and the shaft sleeve, and the contact between the shaft sleeve and the body end hinge are all surface-to-surface contacts; a second processing module configured to determine, based on a preset bolt preload and a preset longitudinal load, a first plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a longitudinal working condition; a third processing module, configured to determine, based on a preset bolt preload and a preset lateral load, a second plastic strain value corresponding to the body end hinge, the door end hinge, and the pin in the target finite element model under a lateral working condition; a fourth processing module, configured to determine the eligibility of the door hinge strength based on the first plastic strain value, the second plastic strain value, and a preset target plastic strain value; The first processing module is further configured to: The vehicle body end hinge is connected to a first fixture, and the door end hinge is connected to a second fixture. The first target constraint conditions corresponding to the first fixture include a translation constraint along the X axis, a translation constraint along the Y axis, a translation constraint along the Z axis, a rotation constraint around the X axis, a rotation constraint around the Y axis, and a rotation constraint around the Z axis. The second target constraint conditions corresponding to the second fixture include a translation constraint along the Z axis, a rotation constraint around the X axis, a rotation constraint around the Y axis, and a rotation constraint around the Z axis. The second processing module is further configured to: performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first target constraint condition, the second target constraint condition, and a preset bolt preload, to obtain a first analysis result; performing a nonlinear finite element analysis on the body end hinge, the door end hinge, and the pin based on the first analysis result, the first target constraint condition, the second target constraint condition, and a preset longitudinal load to obtain a second analysis result; Based on the second analysis result, first plastic strain values ​​corresponding to the vehicle body end hinge, the door end hinge, and the pin in the target finite element model are determined.

5. A door hinge strength modeling device, characterized in that: The door hinge strength modeling device includes a processor, a memory, and a door hinge strength modeling program stored in the memory and executable by the processor, wherein when the door hinge strength modeling program is executed by the processor, the steps of the door hinge strength modeling method as described in any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a door hinge strength modeling program, wherein when the door hinge strength modeling program is executed by a processor, the steps of the door hinge strength modeling method according to any one of claims 1 to 3 are implemented.

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