Vehicle door durability testing method, device, electronic equipment and storage medium

Abstract

The present invention provides a vehicle door durability performance test method, device, electronic device and storage medium. The method includes: classifying vehicle door material data and local vehicle body material data to obtain classified material data, establishing a test model based on the classified material data to obtain a vehicle door durability performance test model, performing a door closing dynamic strength test on the vehicle door durability performance test model based on the vehicle door glass lifting state, the vehicle door closing linear speed and the vehicle door material data to obtain the door closing dynamic stress, and performing a door outside handle pull strength test on the vehicle door durability performance test model based on the door outside handle opening load to obtain the outside pull handle static stress; performing a door durability performance test on the vehicle door durability performance test model based on the door closing dynamic stress and the outside pull handle static stress to obtain the vehicle door fatigue damage strength; improving the accuracy of the vehicle door durability performance test model and the test simulation working condition input, thereby improving the accuracy of the vehicle door fatigue damage strength.

Description

Technical Field

[0001] The present application relates to the field of automotive technology, and in particular to a method, device, electronic equipment and storage medium for testing the durability of a vehicle door. Background Art

[0002] With advancements in automotive development technology, frameless doors are increasingly being adopted as a fashionable design element. However, as a new design, frameless doors present significant structural differences from framed doors. The most significant difference is the lack of a window frame supporting the upper portion of a frameless door, resulting in low lateral stiffness and significant glass sway. During the closing process, the lack of a frame to secure the glass increases its own sway and vibration. Furthermore, the buffering mechanism of frameless doors is inherently deficient, primarily due to the lack of a door frame seal, relying solely on the door opening seal to cushion closing energy. These two factors expose frameless doors to significant impact loads during closing. If the door structure is improperly designed, this load can be sufficient to cause fatigue cracking within the door system. Consequently, frameless doors face increasing challenges in ensuring reliable and durable performance. Prior art testing of door durability performance suffers from a lack of correlation with user usage, resulting in incomplete consideration of test simulation conditions. This leads to inaccurate model input data that impacts durability, and inaccurate simulation model development, resulting in low accuracy in door durability test results.

[0003] For example, CN109697311A discloses a finite element-based method for analyzing the durability of automobile side door opening and closing. (1) The mid-surfaces of the side door outer panel, inner panel, window frame, inner and outer panel reinforcement plates, anti-collision beam, and other parts are extracted and thicknesses are set. Then, the above parts are meshed by finite element. (2) The overall model connection processing: spot welding is simulated using REB3-HEXA-REB3 units, hinges are simulated using solid units, bolt connections are used for bolt connections, hinges are simulated using HINGE units, and the shock-absorbing expansion glue between the side door outer panel, outer panel reinforcement plate, and anti-collision beam is implemented using Adhesive. However, in this solution, spot welding is simulated using REB3-HEXA-REB3 units. Because the REB3 grabbing area is uncontrollable, it is impossible to truly simulate the spot welding impact area; and the fatigue damage caused to the door system by the user pulling the handle when opening the door is not considered.

[0004] For example, CN112100883A discloses a vehicle door fatigue simulation analysis method, comprising at least the following steps: Step S1: finite element discretization and meshing of the vehicle door; Step S3: connecting the vehicle door model; Step S5: meshless modeling simulation of the door lock; and Step S7: fatigue analysis and result interpretation of the vehicle door simulation. However, in this solution, the collision between the door lock and the latch during the door closing process is simulated solely using impact force test curve fitting. Without a real vehicle in the early design phase, test impact force data could not be obtained, and empirical values ​​had to be relied upon instead, severely impacting the accuracy of the simulation analysis. Furthermore, the only simulated state is when the glass is raised, which is inconsistent with user usage habits.

[0005] Both of the above technical solutions still have the following problems: the door interior panels and door glass are replaced by simplified mass units, which cannot effectively simulate the actual inertial response of the components during the door closing process; the fatigue damage to the door system caused by the user pulling the handle when opening the door is not considered; and the treatment method for the most critical elastic elements affecting door closing is not explained.

[0006] Application Contents

[0007] The present application provides a vehicle door durability performance test method, device, electronic device and storage medium to solve the technical problems of inaccurate establishment of the above-mentioned vehicle door durability performance test model, inaccurate input of test simulation conditions affecting durability performance, and low accuracy of test results of vehicle door durability performance test.

[0008] In one embodiment of the present application, the present application provides a vehicle door durability performance testing method including: obtaining vehicle body local material data, vehicle door material data and vehicle door switch physical simulation data, wherein the vehicle door switch physical simulation data includes the vehicle door glass lifting state, the vehicle door closing linear velocity and the door outside handle opening load; performing material property classification on the vehicle door material data and the vehicle body local material data to obtain classified material data, and establishing a test model based on the classified material data to obtain a vehicle door durability performance testing model, wherein the material property classification includes three-dimensional entity class, two-dimensional shell class, one-dimensional class and zero-dimensional mass class; performing a door closing dynamic strength test on the vehicle door durability performance testing model based on the vehicle door glass lifting state, the vehicle door closing linear velocity and the vehicle door material data to obtain the door closing dynamic stress, and performing a door outside handle pull strength test on the vehicle door durability performance testing model based on the door outside handle opening load to obtain the outside handle static stress; performing a door durability performance test on the vehicle door durability performance testing model based on the door closing dynamic stress and the outside handle static stress to obtain the door fatigue damage strength.

[0009] In one embodiment of the present application, a door closing dynamic strength test is performed on the door durability performance test model based on the door glass lifting state, the door closing linear speed and the door material data to obtain the door closing dynamic stress, including: determining the distance between the door lock and the hinge shaft as the first distance; determining the ratio of the first distance and the door closing linear speed as the door closing angular velocity; performing a door closing dynamic strength test on the door durability performance test model according to the door closing angular velocity and the door glass lifting state to obtain the door closing dynamic stress; wherein, the door material data includes the door lock and the hinge shaft, and the door glass lifting state includes a fully open state and a fully closed state.

[0010] In one embodiment of the present application, a door closing dynamic strength test is performed on the door durability performance test model according to the door closing angular velocity and the door glass rising state to obtain the door closing dynamic stress, including: rotating the initial door model outward to a preset angle, and applying the door closing angular velocity to the initial door test model after rotating the preset angle inward to obtain a target door test model; performing a door closing dynamic strength test on the door durability performance test model according to the target door model to obtain the door closing dynamic stress; wherein, the preset angle is used to make the sealing strip in the door model be in a critical pre-compression state, and the door durability performance test model includes the initial door test model.

[0011] In one embodiment of the present application, a door outside handle pull strength test is performed on the vehicle door durability performance test model according to the door outside handle opening load to obtain the static stress of the outside handle, including: applying the door outside handle opening load vertically outward to the initial door outside handle model to obtain a target door outside handle model, wherein the initial door outside handle model is obtained from the vehicle door durability performance test model; and performing a door outside handle pull strength test on the vehicle door durability performance test model according to the target door outside handle model to obtain the static stress of the outside handle.

[0012] In one embodiment of the present application, a door durability test is performed on the door durability test model based on the door closing dynamic stress and the external handle static stress to obtain the door fatigue damage strength, including: determining a closing cycle stress based on the door closing dynamic stress and the external handle static stress; performing a door durability test on the door durability test model based on the closing cycle stress to obtain the initial fatigue damage strength; determining the door fatigue damage strength based on the initial fatigue damage strength and a preset number of durability cycles.

[0013] In one embodiment of the present application, a door durability test is performed on the door durability test model based on the closed cycle stress to obtain the initial fatigue damage strength, including: determining the door sheet metal test model and the spot welding test model as target fatigue test models; performing a door durability test on the target fatigue test model according to the closed cycle stress to obtain the initial fatigue damage strength.

[0014] In one embodiment of the present application, the door durability test model is subjected to a door durability test based on the dynamic stress of closing the door and the static stress of the external pull handle. After the fatigue damage strength of the door is obtained, the door durability test method further includes: obtaining the spot welding, door function and door appearance of the actual vehicle; performing a spot welding inspection on the spot welding, the spot welding inspection includes at least one of a spot welding quality inspection and a spot welding position rationality inspection; performing a functional inspection on the door function, the functional inspection includes at least one of a door opening and closing abnormal state inspection and a door body opening and closing interference state inspection; performing a quality inspection on the door appearance, the quality inspection includes at least one of a door sheet metal deformation state inspection, a paint peeling state inspection, a dent state inspection, an initial crack state inspection, a sealing strip assembly quality inspection and a buffer block assembly quality inspection.

[0015] In one embodiment of the present application, the material properties of the door material data and the local material data of the vehicle body are classified to obtain classified material data, and a test model is established based on the classified material data to obtain a door durability performance test model, including: performing entity mesh division based on three-dimensional entity property material data to obtain an entity test model; performing shell unit mesh division based on two-dimensional shell property material data to obtain a shell unit test model; performing one-dimensional mesh division based on one-dimensional property material data to obtain a one-dimensional test model; performing mass unit replacement based on zero-dimensional mass property material data to obtain a quality test model; and performing mass unit replacement based on the entity test model, The shell unit test model, the one-dimensional test model and the mass test model determine the vehicle door durability performance test model; wherein, the classified material data includes the three-dimensional entity attribute material data, the two-dimensional shell attribute material data, the one-dimensional attribute material data and the zero-dimensional mass attribute material data, the three-dimensional entity attribute material data includes at least hinges and door exterior handles, the two-dimensional shell attribute material data includes at least one of door glass, door sheet metal and door interior panel, the one-dimensional attribute material data includes at least one of spot welding and elastic elements, and the zero-dimensional mass attribute material data includes at least one of glass motor and door speaker.

[0016] In one embodiment of the present application, one-dimensional grid division is performed based on one-dimensional property material data to obtain a one-dimensional test model, including: performing nonlinear spring unit simulation on the elastic element, and assigning the measured stiffness value to the nonlinear spring unit to obtain an elastic element test model, the elastic element includes at least one of a sealing strip, a buffer block and a water cut, and the measured stiffness value is obtained from the one-dimensional property material data; performing spider web simulation on the spot welding to obtain a spot welding test model; and determining the one-dimensional test model based on the elastic element test model and the spot welding test model.

[0017] In one embodiment of the present application, the present application provides a vehicle door durability performance test device comprising: a data acquisition module for acquiring vehicle body local material data, door material data and door switch physical simulation data, wherein the door switch physical simulation data includes the door glass lifting state, the door closing linear speed and the door handle opening load; a model building module for classifying the door material data and the vehicle body local material data into material properties to obtain classified material data, and building a test model based on the classified material data to obtain a door durability performance test model, wherein the material property classification includes three-dimensional Entity class, two-dimensional shell class, one-dimensional class and zero-dimensional mass class; a stress determination module, used to perform a door closing dynamic strength test on the door durability performance test model based on the door glass lifting state, the door closing linear speed and the door material data to obtain the door closing dynamic stress, and perform a door outside handle pull strength test on the door durability performance test model according to the door outside handle opening load to obtain the outside handle static stress; a durability test module, used to perform a door durability test on the door durability performance test model according to the door closing dynamic stress and the outside handle static stress to obtain the door fatigue damage strength.

[0018] The present application also provides an electronic device, which includes: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the electronic device implements the vehicle door durability performance testing method as described in any one of the above embodiments.

[0019] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor of a computer, the computer is caused to execute the vehicle door durability performance testing method as described in any one of the above embodiments.

[0020] Beneficial effects of the present invention: The present invention provides a method, device, electronic device and storage medium for testing the durability of a vehicle door. In the present invention, a vehicle door durability test model established after precise material property classification of the vehicle door material data and the local material data of the vehicle body is more accurate, and the dynamic stress of closing the door is determined according to the raised state of the vehicle door glass in the actual user usage condition, and the static stress of the outside handle is determined according to the opening load of the outside door handle in the actual user usage condition. The accuracy of the test simulation conditions that affect the durability performance, namely, the dynamic stress of closing the door and the static stress of the outside handle are improved, thereby improving the accuracy of the test results of the vehicle door durability test, namely, improving the accuracy of the fatigue damage strength of the vehicle door.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, serving to explain the principles of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and a person of ordinary skill in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0023] Figure 1 A schematic flow chart of a method for testing the durability of a vehicle door according to one embodiment of the present application is shown;

[0024] Figure 2 shows a sealing strip stiffness test curve according to one embodiment of the present application;

[0025] Figure 3 A schematic diagram of stress method spot welding modeling according to one embodiment of the present application is shown;

[0026] Figure 4 A schematic diagram of a lock mechanism and a lock buckle rigid-flexible coupling model according to an embodiment of the present application is shown;

[0027] Figure 5 A schematic diagram of a method for calculating the closing angular velocity of a vehicle door system according to one embodiment of the present application is shown;

[0028] Figure 6 The figure shows the strength condition of pulling the outer door handle according to one embodiment of the present application;

[0029] Figure 7 A schematic diagram of a process flow for controlling the opening and closing durability fatigue performance of a frameless vehicle door according to an embodiment of the present application is shown;

[0030] Figure 8A block diagram of a vehicle door durability testing device according to one embodiment of the present application is shown;

[0031] Figure 9 A schematic diagram of the structure of a computer system suitable for implementing an electronic device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] The following will describe the embodiments of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand the other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for the purpose of illustrating the present application and are not intended to limit the scope of protection of the present application.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0034] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0035] First of all, it should be noted that in the relevant technology, there is a technical problem in that the test simulation conditions in the vehicle door durability performance test are not fully considered due to the lack of connection with user usage, that is, the model input data affecting durability is inaccurate, and the test simulation model is not established accurately, which leads to low accuracy of the test results of the vehicle door durability performance test.

[0036] In order to solve the above technical problems, the present application provides a vehicle door durability performance testing method, device, electronic device and storage medium. The implementation details of the technical solution of the embodiment of the present application are elaborated in detail below.

[0037] See also Figure 1 , Figure 1 FIG1 shows a flow chart of a method for testing the durability of a vehicle door according to an embodiment of the present application. Figure 1 As shown, in an exemplary embodiment, the vehicle door durability performance testing method includes at least steps S110 to S140, which are described in detail as follows:

[0038] Step S110 , obtaining the vehicle body local material data, door material data, and door switch physical simulation data.

[0039] Among them, the physical simulation data of the door switch includes the door glass rising state, the door closing linear speed and the door outside handle opening load.

[0040] In one embodiment of the present application, local body material data and door material data are acquired through pre-processing applications, including but not limited to HyperMesh and ANSA. Door material data includes but is not limited to frameless door interior and exterior sheet metal, interior and exterior panel expansion adhesive, door glass, glass guide rails, door interior trim, hinges, glass motors, door speakers, elastic elements, exterior door handles, resistance spot welds, lock mechanisms, and latches. Local body material data refers to parts connected to the doors. Doors can be frameless or framed.

[0041] Step S120 , classifying the vehicle door material data and the vehicle body local material data by material properties to obtain classified material data, and establishing a test model based on the classified material data to obtain a vehicle door durability performance test model.

[0042] Among them, the material property classification includes three-dimensional solid class, two-dimensional shell class, one-dimensional class and zero-dimensional mass class.

[0043] In one embodiment of the present application, material property classification is performed on vehicle door material data and local vehicle body material data to obtain classified material data, and a test model is established based on the classified material data to obtain a vehicle door durability performance test model, including: performing entity mesh division based on three-dimensional entity property material data to obtain an entity test model; performing shell unit mesh division based on two-dimensional shell property material data to obtain a shell unit test model; performing one-dimensional mesh division based on one-dimensional property material data to obtain a one-dimensional test model; performing mass unit replacement based on zero-dimensional mass property material data to obtain a mass test model; determining the vehicle door durability performance test model based on the entity test model, shell unit test model, one-dimensional test model and mass test model; wherein the classified material data includes three-dimensional entity property material data, two-dimensional shell property material data, one-dimensional property material data and zero-dimensional mass property material data, the three-dimensional entity property material data includes at least a hinge and a door exterior handle, the two-dimensional shell property material data includes at least one of door glass, door sheet metal and door interior panel, the one-dimensional property material data includes at least one of spot welding and elastic element, and the zero-dimensional mass property material data includes at least one of a glass motor and a door speaker.

[0044] In one embodiment of this application, the 3D solid material attribute data includes, but is not limited to, the inner and outer panel expansion adhesive, the exterior door handle, and the hinge. The interior and outer panel expansion adhesive is modeled using a solid mesh and shares nodes with the inner and outer sheet metal of the frameless door. The hinge is modeled using a solid mesh, with the hinge axis modeled using beam B31 elements, and the hinge is free of axial rotational freedom. The exterior door handle is moved to the open position and modeled using a solid mesh, where it is bolted to the door.

[0045] In one embodiment of the present application, one-dimensional grid division is performed based on one-dimensional property material data to obtain a one-dimensional test model, including: simulating the elastic element with a nonlinear spring unit, and assigning the measured stiffness value to the nonlinear spring unit to obtain an elastic element test model, the elastic element includes at least one of a sealing strip, a buffer block and a water cut, and the measured stiffness value is obtained from the one-dimensional property material data; performing a spider web simulation on the spot welding to obtain a spot welding test model; and determining the one-dimensional test model based on the elastic element test model and the spot welding test model.

[0046] In one embodiment of the present application, the sealing strip is simulated using the nonlinear spring element CONN3D2, assigned a nonlinear material, and the measured stiffness value of the sealing strip is assigned. Figure 2 , Figure 2 FIG. 1 shows a sealing strip stiffness test curve according to an embodiment of the present application. Figure 2 As shown in the figure, to more realistically simulate the cushioning and limiting effects of the sealing strip, the measured stiffness of the sealing strip must be tested to the nonlinear range. The vertical axis represents the load applied to the sealing strip, measured in Newtons per 100 mm (N / 100mm); the horizontal axis represents the degree of deformation of the sealing strip, measured in millimeters (mm). The stiffness testing methods for the buffer block and water shear can be referenced in the stiffness testing of the sealing strip. Sheet metal welds are simulated using a shell element mesh. The solders used in sheet metal welds include, but are not limited to, soldering and tin soldering.

[0047] In one embodiment of the present application, a spider web form is simulated for spot welding. The spider web form can be modeled using the FEMFATSPOT type resistance spot welding and the stress method is used to perform fatigue analysis. The geometric data of the resistance spot welding is imported into the pre-processing application. Figure 3 , Figure 3 FIG. 1 shows a schematic diagram of stress spot welding modeling according to an embodiment of the present application. Figure 3 As shown, each spot weld consists of two layers of shell elements and B31 elements. Each layer of shell elements contains 4 quadrilateral elements in the inner circle and 8 quadrilateral elements in the outer circle.

[0048] In one embodiment of the present application, see Figure 4 , Figure 4 FIG1 shows a schematic diagram of a lock mechanism and a lock buckle rigid-flexible coupling model according to an embodiment of the present application. Figure 4 As shown, the locking mechanism and latch are modeled using a rigid-flexible coupling model, also known as a solid shell. Latch 401 is a rigid body model, while ratchet 403, locking plate 404, and pawl 405 are flexible body models. This beneficially reduces computational effort during dynamic impact analysis and avoids the issue of aberrant impact stress response due to the presence of rigid bodies during impact. The meshing between ratchet 403 and pawl 405 is simulated using spring elements 402 and 406. The contact type between ratchet 403, pawl 405, latch 40, and locking plate 404 is surface-to-surface.

[0049] In one embodiment of the present application, the glass motor and the door speaker are replaced by MASS mass to obtain a zero-dimensional mass test model.

[0050] Step S130, based on the door glass lifting state, door closing linear speed and door material data, the door durability performance test model is subjected to a door closing dynamic strength test to obtain the door closing dynamic stress, and the door durability performance test model is subjected to a door outside handle external pull strength test according to the door outside handle opening load to obtain the external pull handle static stress.

[0051] In one embodiment of the present application, a door closing dynamic strength test is performed on a door durability performance test model based on the door glass lifting state, the door closing linear speed and the door material data to obtain the door closing dynamic stress, including: determining the distance between the door lock and the hinge shaft as the first distance; determining the ratio of the first distance and the door closing linear speed as the door closing angular velocity; performing a door closing dynamic strength test on the door durability performance test model according to the door closing angular velocity and the door glass lifting state to obtain the door closing dynamic stress; wherein the door material data includes the door lock and the hinge shaft, and the door glass lifting state includes the fully open state and the fully closed state.

[0052] In one embodiment of the present application, the raised state of the door glass in the test is determined according to the user's usage habits. The fully closed state is when the door glass is at the uppermost end, and the fully open state is when the door glass is at the lowermost end.

[0053] In one embodiment of the present application, see Figure 5 , Figure 5 FIG. 1 shows a schematic diagram of a method for calculating the closing angular velocity of a vehicle door system according to an embodiment of the present application. Figure 5 As shown, the horizontal length between the door lock and the hinge axis is determined as the first distance L, and the door closing angular velocity ω is determined according to the ratio of the door closing linear velocity V to the first distance L. The door closing angular velocity is as follows:

[0054]

[0055] Wherein, ω is the door closing angular velocity, V is the door closing linear velocity, and L is the first distance.

[0056] In one embodiment of the present application, a door closing dynamic strength test is performed on a door durability performance test model according to the door closing angular velocity and the door glass lifting state to obtain the door closing dynamic stress, including: rotating the initial door model outward to a preset angle, and applying inward force to the initial door test model after rotating the preset angle at the door closing angular velocity to obtain a target door test model; performing a door closing dynamic strength test on the door durability performance test model according to the target door model to obtain the door closing dynamic stress; wherein the preset angle is used to make the sealing strip in the door model be in a critical pre-compression state, and the door durability performance test model includes the initial door test model.

[0057] In one embodiment of the present application, a vehicle body section within a local vehicle body test model is node-constrained, and the initial door model is rotated outward to a preset angle, placing the sealing strip in a critical pre-compression state. An inward-rotating door closing angular velocity is applied to the initial door model to generate a target door model that simulates the transient door closing process. A dynamic explicit nonlinear solver is then used to solve the door durability performance test model for a closing dynamic strength test. For example, the closing dynamic strength test is solved using the explicit display module solver within the dynamic explicit nonlinear solver ABAQUS. If the door glass is fully open, the door durability performance test model is subjected to a fully open dynamic strength test to obtain the fully open dynamic stress. If the door glass is fully closed, the door durability performance test model is subjected to a fully closed dynamic strength test to obtain the fully closed dynamic stress. The fully open dynamic stress and the fully closed dynamic stress are used as the closing dynamic stress. The local vehicle body test model is derived from the door durability performance test model.

[0058] In one embodiment of the present application, a door outside handle pull strength test is performed on a vehicle door durability performance test model according to a door outside handle opening load to obtain a static stress of the outside handle, including: applying the door outside handle opening load vertically outward to an initial door outside handle model to obtain a target door outside handle model, wherein the initial door outside handle model is obtained from a vehicle door durability performance test model; and performing a door outside handle pull strength test on a vehicle door durability performance test model according to the target door outside handle model to obtain a static stress of the outside handle.

[0059] In one embodiment of the present application, the node fixed constraint is performed on the section of the vehicle body in the local test model of the vehicle body. Figure 6 , Figure 6 The figure shows the strength condition of pulling the door handle according to one embodiment of the present application. Figure 6As shown in the figure, based on actual user usage, the door handle opening load is applied vertically outward to the initial door handle model when the user pulls the door handle to open the door. All degrees of freedom at the vehicle body section and the door lock are fixedly constrained. The door handle external pull strength test is solved for the vehicle door durability test model to obtain the static stress of the external pull handle. For example, the Static module solver in ABAQUS is used to solve the door handle external pull strength test.

[0060] Step S140 , performing a door durability test on the door durability test model according to the dynamic stress of closing the door and the static stress of pulling the handle outside, and obtaining the fatigue damage strength of the door.

[0061] In one embodiment of the present application, a vehicle door durability test model is subjected to a vehicle door durability test based on the dynamic stress of closing the door and the static stress of pulling the handle outward to obtain the vehicle door fatigue damage strength, including: determining a closing cycle stress based on the dynamic stress of closing the door and the static stress of pulling the handle outward; conducting a vehicle door durability test model based on the closing cycle stress to obtain the initial fatigue damage strength; determining the vehicle door fatigue damage strength based on the initial fatigue damage strength and a preset number of durability cycles.

[0062] In one embodiment of the present application, a door durability test model is subjected to a door durability test based on closed cycle stress to obtain initial fatigue damage strength, including: determining a door sheet metal test model and a spot welding test model as target fatigue test models; and conducting a door durability test on the target fatigue test model according to closed cycle stress to obtain initial fatigue damage strength.

[0063] In one embodiment of the present application, the dynamic stress of closing the door during the door closing process and the static stress of pulling the door handle when opening the door are opened are imported into the fatigue analysis application as closed cycle stresses to simulate a complete opening and closing cycle. The fatigue analysis application includes FEMFAT. By deleting the mass test model and the entity test model, the shell unit toilet test model and part of the one-dimensional test model are retained. The door sheet metal test model and the spot welding test model contained in the door sheet metal test model are grouped according to the material to obtain an inp format file based on the material group, which is imported into the fatigue analysis application FEMFAT to assign the material SN curve, import the ODB format file of the closed cycle stress into the time step, check the Gaussian influence, check SPOT to start the spot welding fatigue calculation, set the output file format, carry out fatigue analysis of the door sheet metal and spot welding, and obtain the initial fatigue damage strength.

[0064] In one embodiment of the present application, the initial fatigue damage intensity is the fatigue damage caused by a single door closing process and a single opening and closing cycle of pulling the door handle. Based on a preset number of durability performance cycles, the initial fatigue damage intensity obtained from a single damage is fatigue-accumulated and superimposed to obtain the door fatigue damage intensity. Finally, based on the fatigue damage judgment criteria, it is determined whether the door fatigue damage intensity obtained for the frameless door design meets the durability performance definition requirements.

[0065] In one embodiment of the present application, a door durability test model is subjected to a door durability test based on the dynamic stress of closing the door and the static stress of the external handle, and after the fatigue damage strength of the door is obtained, the door durability test method further includes: obtaining the spot welding, door function and door appearance of the actual vehicle; performing a spot welding inspection on the spot welding, the spot welding inspection includes at least one of a spot welding quality inspection and a spot welding position rationality inspection; performing a functional inspection on the door function, the functional inspection includes at least one of a door opening and closing abnormal state inspection and a door body opening and closing interference state inspection; performing a quality inspection on the door appearance, the quality inspection includes at least one of a door sheet metal deformation state inspection, a paint peeling state inspection, a bump state inspection, an initial crack state inspection, a sealing strip assembly quality inspection and a buffer block assembly quality inspection.

[0066] In one embodiment of the present application, the overall condition of the frameless doors of a real vehicle is inspected, i.e., a door test entry inspection is performed on the frameless doors to ensure that the doors are in good condition and can be properly tested for durability. This helps prevent false durability issues caused by manufacturing and assembly processes, which could affect the achievement of durability performance targets and the project development cycle. The door test entry inspection for frameless doors includes spot welding inspection, functional inspection, and appearance inspection.

[0067] In one embodiment of the present application, see Figure 7 , Figure 7 The figure shows a schematic diagram of the control process of the opening and closing durability fatigue performance of a frameless vehicle door according to an embodiment of the present application. Figure 7As shown, the frameless door opening and closing durability simulation modeling: the test model is established according to the local material data of the car body and the door material data of the frameless door, and the door durability performance test model is obtained; the closing dynamic strength analysis: the closing dynamic strength test of the door durability performance test model is carried out based on the door glass rising state, the door closing linear speed and the door material data to obtain the closing dynamic stress; the door outside handle external pull strength analysis: the door outside handle external pull strength test of the door durability performance test model is carried out according to the door outside handle opening load to obtain the external pull handle static stress; the frameless door opening and closing durability fatigue analysis: according to the closing dynamic stress and the external pull handle static stress Carry out door durability test on the door durability test model to obtain door fatigue damage strength. If the door fatigue damage strength does not meet the durability performance definition requirements, perform structural optimization design. If the door fatigue damage strength meets the durability performance definition requirements, perform opening and closing durability test access control. Opening and closing durability test access control: spot welding inspection is performed on the spot welding of the actual vehicle, functional inspection is performed on the door function, and quality inspection is performed on the door appearance. Frameless door opening and closing durability test is qualified: if the frameless door opening and closing durability test requirements are met, the test is terminated. If the frameless door opening and closing durability test requirements are not met, the simulation model is calibrated / optimized and rectified. This application can take into account the actual usage conditions of users, add the damage to the door system caused by the user pulling the door handle to open the door, and form a complete usage cycle condition with the transient closing of the car door, thereby improving the durability performance control method. This condition is consistent with the actual working condition of the user; it can also, in the actual vehicle verification stage, based on process control, component quality control and function control, enable the actual vehicle to reflect the design status to the greatest extent and avoid pseudo-durability problems caused by non-design factors; it can also, in the tooling prototype stage, through actual vehicle opening and closing durability verification, for situations that do not meet the target requirements, iterate the solution through simulation calibration until the physical prototype meets the performance target requirements; it can also reduce the number of design changes of the car door due to durability problems in the later stage, shorten the development cycle, and reduce development costs.

[0068] See also Figure 8 , Figure 8 The block diagram of a vehicle door durability performance testing device according to one embodiment of the present application is shown. The device can be applied to other exemplary implementation environments and specifically configured in other devices. This embodiment does not limit the implementation environment to which the device is applied.

[0069] like Figure 8 As shown, a vehicle door durability performance testing device 800 according to an embodiment of the present application includes: a test data acquisition module 801 , input data set determination modules 802 and 803 , and an evaluation result determination module 804 .

[0070] Among them, the data acquisition module 801 is used to obtain the vehicle body local material data, door material data and door switch physical simulation data, the door switch physical simulation data includes the door glass rising state, the door closing linear speed and the door outside handle opening load; the model establishment module 802 is used to classify the material properties of the door material data and the vehicle body local material data to obtain classified material data, and establish a test model based on the classified material data to obtain a door durability test model, the material property classification includes three-dimensional entity class, two-dimensional shell class, one-dimensional class and zero-dimensional mass class; the stress determination module 803 is used to perform a door closing dynamic strength test on the door durability test model based on the door glass rising state, the door closing linear speed and the door material data to obtain the door closing dynamic stress, and perform a door outside handle pull strength test on the door durability test model according to the door outside handle opening load to obtain the outside handle static stress; the durability test module 804 is used to perform a door durability test on the door durability test model based on the door closing dynamic stress and the outside handle static stress to obtain the door fatigue damage strength.

[0071] It should be noted that the vehicle door durability testing device provided in the above-described embodiment and the vehicle door durability testing method provided in the above-described embodiment share the same concept. The specific manner in which the various modules and units perform their operations has been described in detail in the method embodiments and will not be repeated here. In actual applications, the vehicle door durability testing device provided in the above-described embodiment can, as needed, allocate the aforementioned functions to different functional modules. This means that the internal structure of the device can be divided into different functional modules to perform all or part of the aforementioned functions, and this is not intended to be limiting herein.

[0072] An embodiment of the present application also provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, which, when executed by one or more processors, enables the electronic device to implement the vehicle door durability performance testing method provided in the above-mentioned embodiments.

[0073] See also Figure 9 , Figure 9 The following is a schematic diagram showing the structure of a computer system suitable for implementing an electronic device according to an embodiment of the present application. Figure 9 The computer system 900 of the electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0074] like Figure 9As shown, the computer system 900 includes a central processing unit (CPU) 901, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 902 or the program loaded from the storage part 908 into the random access memory (RAM) 903, such as executing the method in the above embodiment. In the RAM 903, various programs and data required for system operation are also stored. The CPU 901, ROM 902 and RAM 903 are connected to each other via a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.

[0075] The following components are connected to the I / O interface 905: an input section 906 including a keyboard, a mouse, and the like; an output section 907 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 908 including a hard disk and the like; and a communication section 909 including a network interface card such as a LAN (Local Area Network) card or a modem. The communication section 909 performs communication processing via a network such as the Internet. A drive 910 is also connected to the I / O interface 905 as needed. A removable medium 911, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 910 as needed, so that a computer program read therefrom can be installed into the storage section 908 as needed.

[0076] According to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 909, and / or installed from a removable medium 911. When the computer program is executed by the central processing unit (CPU) 901, the various functions defined in the system of the present application are executed.

[0077] It should be noted that the computer-readable medium shown in the embodiments of the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. The computer-readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable computer program. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. A computer program embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0078] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. Among them, each box in the flowchart or block diagram can represent a module, program segment, or part of the code, and the above-mentioned module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0079] The units involved in the embodiments described in this application may be implemented by software or hardware, and the units described may also be set in a processor. In some cases, the names of these units do not constitute limitations on the units themselves.

[0080] Another aspect of the present application provides a computer-readable storage medium storing a computer program. When executed by a computer processor, the computer program causes the computer to perform the vehicle door durability testing methods described in the various embodiments described above. The computer-readable storage medium may be included in the electronic device described in the embodiments above, or may exist independently and not be incorporated into the electronic device.

[0081] In the above embodiments, unless otherwise specified, the use of serial numbers such as "first" and "second" to describe common objects only indicates that they refer to different instances of the same object, rather than indicating that the objects being described must adopt a given order, whether in time, space, sorting or any other way.

[0082] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, any equivalent modifications or alterations accomplished by a person of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A method for testing the durability of a vehicle door, characterized in that: The vehicle door durability performance testing method includes: Obtaining local material data of the vehicle body, material data of the door, and physical simulation data of the door switch, wherein the physical simulation data of the door switch includes the door glass lifting state, the door closing linear speed, and the door exterior handle opening load; Classifying the door material data and the vehicle body local material data by material properties to obtain classified material data, and establishing a test model based on the classified material data to obtain a door durability performance test model, wherein the material property classification includes a three-dimensional solid class, a two-dimensional shell class, a one-dimensional class, and a zero-dimensional mass class; Performing a door closing dynamic strength test on the door durability test model based on the door glass lifting state, the door closing linear speed, and the door material data to obtain the door closing dynamic stress, and performing a door handle pull-out strength test on the door durability test model based on the door handle opening load to obtain the pull-out handle static stress; Performing a door durability test on the door durability test model according to the door closing dynamic stress and the external handle static stress to obtain the door fatigue damage strength; The method of classifying the door material data and the vehicle body local material data by material property to obtain classified material data, and establishing a test model based on the classified material data to obtain the door durability performance test model includes: Perform entity mesh division based on 3D entity attribute material data to obtain an entity test model; Perform shell unit meshing based on two-dimensional shell property material data to obtain a shell unit test model; Perform one-dimensional meshing based on one-dimensional property material data to obtain a one-dimensional test model; The mass unit is replaced according to the zero-dimensional mass attribute material data to obtain the mass test model; Determine a vehicle door durability performance test model based on the physical test model, the shell unit test model, the one-dimensional test model, and the mass test model; Among them, the classified material data includes the three-dimensional entity attribute material data, the two-dimensional shell attribute material data, the one-dimensional attribute material data and the zero-dimensional mass attribute material data, the three-dimensional entity attribute material data includes at least hinges and door exterior handles, the two-dimensional shell attribute material data includes at least one of door glass, door sheet metal and door interior panel, the one-dimensional attribute material data includes at least one of spot welding and elastic elements, and the zero-dimensional mass attribute material data includes at least one of glass motor and door speaker.

2. The vehicle door durability performance testing method according to claim 1, characterized in that: The door closing dynamic strength test is performed on the door durability performance test model based on the door glass raising state, the door closing linear speed, and the door material data to obtain the door closing dynamic stress, including: Determine the distance between the door lock and the hinge axis as a first distance; determining a ratio of the first distance to the door closing linear velocity as the door closing angular velocity; Performing a door closing dynamic strength test on the door durability test model according to the door closing angular velocity and the door glass raising state to obtain the door closing dynamic stress; The vehicle door material data includes the door lock and the hinge shaft, and the vehicle door glass raising state includes a fully open state and a fully closed state.

3. The vehicle door durability testing method according to claim 2, characterized in that: Performing a door closing dynamic strength test on the door durability test model according to the door closing angular velocity and the door glass raising state to obtain the door closing dynamic stress includes: The initial vehicle door test model is rotated outward to a preset angle, and the initial vehicle door test model rotated by the preset angle is subjected to an inward rotation force at the door closing angular velocity to obtain a target vehicle door test model; Performing a door closing dynamic strength test on the door durability performance test model according to the target door test model to obtain a door closing dynamic stress; The preset angle is used to place the sealing strip in the initial vehicle door test model in a critical pre-compression state, and the vehicle door durability performance test model includes the initial vehicle door test model.

4. The vehicle door durability testing method according to claim 2, characterized in that: The door exterior handle external pull strength test is performed on the vehicle door durability test model according to the door exterior handle opening load to obtain the static stress of the external pull handle, including: Applying the door outside handle opening load vertically outward to an initial door outside handle model to obtain a target door outside handle model, wherein the initial door outside handle model is obtained from the vehicle door durability performance test model; The door outer handle external pull strength test is performed on the vehicle door durability performance test model according to the target door outer handle model to obtain the static stress of the outer pull handle.

5. The vehicle door durability testing method according to claim 4, characterized in that: The vehicle door durability test model is subjected to a vehicle door durability test based on the door closing dynamic stress and the external handle static stress to obtain the vehicle door fatigue damage strength, including: Determining a closing cycle stress based on the door closing dynamic stress and the external handle static stress; Performing a door durability test on the door durability test model based on the closing cycle stress to obtain an initial fatigue damage strength; The fatigue damage strength of the vehicle door is determined according to the initial fatigue damage strength and the preset durability performance cycle number.

6. The vehicle door durability performance testing method according to claim 5, characterized in that: Performing a door durability test on the door durability test model based on the closing cycle stress to obtain an initial fatigue damage strength includes: The door sheet metal test model and the spot welding test model are determined as target fatigue test models; A vehicle door durability test is performed on the target fatigue test model according to the closing cycle stress to obtain an initial fatigue damage strength.

7. The vehicle door durability testing method according to any one of claims 1 to 6, characterized in that: After performing a door durability test on the door durability test model based on the door closing dynamic stress and the external handle static stress to obtain the door fatigue damage strength, the door durability test method further includes: Obtain spot welding, door functions and door appearance of the actual vehicle; Performing a spot welding inspection on the spot welding, wherein the spot welding inspection includes at least one of a spot welding quality inspection and a spot welding position rationality inspection; Performing a function check on the door function, the function check including at least one of checking for abnormal door opening and closing state and checking for interference between the door and the vehicle body opening and closing state; The vehicle door appearance is subjected to a quality inspection, wherein the quality inspection includes at least one of a vehicle door sheet metal deformation inspection, a paint peeling inspection, a bruise inspection, an initial crack inspection, a sealing strip assembly quality inspection, and a buffer block assembly quality inspection.

8. The vehicle door durability testing method according to claim 1, characterized in that: Perform one-dimensional meshing based on one-dimensional property material data to obtain a one-dimensional test model, including: Performing a nonlinear spring unit simulation on the elastic element and assigning a measured stiffness value to the nonlinear spring unit to obtain an elastic element test model, wherein the elastic element includes at least one of a sealing strip, a buffer block, and a water shear, and the measured stiffness value is obtained from the one-dimensional property material data; Performing spider web simulation on the spot welding to obtain a spot welding test model; The one-dimensional test model is determined according to the elastic element test model and the spot welding test model.

9. A vehicle door durability testing device, characterized in that: The vehicle door durability testing device comprises: A data acquisition module, configured to acquire vehicle body local material data, door material data, and door switch physical simulation data, wherein the door switch physical simulation data includes the door glass lifting state, the door closing linear speed, and the door exterior handle opening load; The model building module is used to classify the material properties of the vehicle door material data and the local material data of the vehicle body to obtain classified material data, and to establish a test model based on the classified material data to obtain a vehicle door durability performance test model. The material property classification includes three-dimensional entity class, two-dimensional shell class, one-dimensional class and zero-dimensional mass class. The material property classification of the vehicle door material data and the local material data of the vehicle body to obtain classified material data, and to establish a test model based on the classified material data to obtain a vehicle door durability performance test model includes: performing entity meshing based on three-dimensional entity property material data to obtain an entity test model; performing shell unit meshing based on two-dimensional shell property material data to obtain a shell unit test model; performing one-dimensional meshing based on one-dimensional property material data Grid division is performed to obtain a one-dimensional test model; mass unit replacement is performed according to the zero-dimensional mass attribute material data to obtain a mass test model; the vehicle door durability performance test model is determined according to the entity test model, the shell unit test model, the one-dimensional test model and the mass test model; wherein the classified material data includes the three-dimensional entity attribute material data, the two-dimensional shell attribute material data, the one-dimensional attribute material data and the zero-dimensional mass attribute material data, the three-dimensional entity attribute material data includes at least a hinge and an outer door handle, the two-dimensional shell attribute material data includes at least one of a door glass, a door sheet metal and a door interior panel, the one-dimensional attribute material data includes at least one of a spot welding and an elastic element, and the zero-dimensional mass attribute material data includes at least one of a glass motor and a door speaker; a stress determination module, configured to perform a door closing dynamic strength test on the vehicle door durability performance test model based on the door glass lifting state, the door closing linear speed, and the door material data to obtain the door closing dynamic stress, and to perform a door handle pull strength test on the vehicle door durability performance test model based on the door handle opening load to obtain the pull handle static stress; The durability test module is used to perform a door durability test on the door durability test model according to the door closing dynamic stress and the external handle static stress to obtain the door fatigue damage strength.

10. An electronic device, characterized in that: The electronic device comprises: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, enables the electronic device to implement the vehicle door durability performance testing method as described in any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor of a computer, the computer is caused to execute the vehicle door durability performance testing method according to any one of claims 1 to 8.

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