Method and device for simulating and evaluating the dent resistance of a body panel

Abstract

The application relates to the field of automobile technology, and provides a simulation evaluation method and device for the dent resistance of a vehicle body covering, wherein the method comprises the following steps: comparing a simulation model with the structure and test conditions of the vehicle body covering, so as to ensure that the simulation model is consistent with the structure and test conditions of the vehicle body covering; comparing the simulation model with the test results of the vehicle body covering, and correcting the simulation model according to the comparison results, so as to ensure that the simulation model is within an error range of the test results of the vehicle body covering; calibrating the buckling determination threshold of the simulation model according to the buckling condition of the vehicle body covering, and simulating and evaluating the dent resistance of the vehicle body covering through the calibrated simulation model. The simulation model is compared with the vehicle body covering, the consistency of the simulation model and the vehicle body covering is fully ensured, the simulation model after calibration of the buckling determination threshold has higher precision, and can be used for accurately evaluating the dent resistance of the vehicle body covering.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a simulation evaluation method and apparatus for the dent resistance performance of body panels. Background Technology

[0002] With the development of lightweight vehicles, the application of high-strength, thin steel plates in car bodies has become increasingly common. However, while reducing the thickness of the plates, the problem of dent resistance in the car body during use has become more prominent. In particular, body panels are often large in size and have relatively smooth shapes. During use, they are frequently subjected to external pressure loads, such as human finger pressing, impact from gravel, etc. If the dent resistance of the body panels is insufficient, they are prone to denting and deformation under external forces during use.

[0003] The ability of a body panel to resist deformation under external forces is called its dent resistance. The dent resistance of body panels is an important indicator for evaluating the surface quality and performance of a car. If a large deformation occurs under a small load, it will seriously affect consumers' impression of the car's quality. Therefore, in the body design stage, it is necessary to ensure that the body panels have sufficient dent resistance.

[0004] Currently, using finite element method (FEM) simulation analysis based on Abaqus to perform dent resistance analysis is an important virtual verification method in the early stages of body panel design. Dent resistance bench tests are conducted on body panels during the soft model and PPC (Prototype Process Control) stages. Ideally, for cost reasons, CAE (Computer-Aided Engineering) methods would be used to partially replace the actual testing process for dent resistance evaluation, thereby reducing development costs and improving efficiency. However, due to differences in structure, testing conditions, material properties, and loading methods between the simulation model and the actual testing process, the results often have significant errors, typically exceeding 20%. This prevents the simulation model from accurately evaluating the dent resistance of the body panel. Therefore, a benchmark analysis between the simulation model and the body panel is needed to improve the accuracy of the simulation model.

[0005] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0006] This invention provides a solution to the technical problem of inaccurate simulation evaluation of the dent resistance performance of body panels due to low accuracy of existing simulation models and large errors between simulation models and actual measurement results of body panels.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a simulation evaluation method for the dent resistance performance of vehicle body panels, comprising:

[0009] The simulation model is compared with the structure and test conditions of the body panel to ensure that the simulation model is consistent with the structure and test conditions of the body panel.

[0010] The simulation model is compared with the test results of the body panels, and the simulation model is corrected according to the comparison results to ensure that the simulation model and the test results of the body panels are within the error range.

[0011] The buckling threshold of the simulation model is calibrated based on the buckling condition of the body panel, and the dent resistance performance of the body panel is evaluated by simulation using the calibrated simulation model.

[0012] Preferably, ensuring that the simulation model is structurally consistent with the vehicle body panels includes:

[0013] Obtain the design parameters of the body panel; the design parameters of the body panel include material thickness, size, weld point location and number of weld points;

[0014] The simulation model was assigned values ​​based on the design parameters of the vehicle body panels.

[0015] Preferably, ensuring that the simulation model and the test conditions of the vehicle body panels are consistent includes:

[0016] The simulation model is constrained by referring to the constraint method of the vehicle body panels;

[0017] The pressure loading head of the vehicle body panel is used to construct a simulation model of the pressure loading head.

[0018] The simulation model was subjected to pressure loading, referencing the pressure loading method used for vehicle body panels.

[0019] Preferably, the pressure loading method for the vehicle body panel includes:

[0020] Determine the number and location of pressure loading points on the vehicle body panels;

[0021] Pressure is applied to each pressure loading point using a pressure loading head on the body panel.

[0022] The force at each pressure loading point is collected by a force sensor, and the displacement at each pressure loading point is collected by a displacement sensor.

[0023] Preferably, the step of comparing the simulation model with the test results of the vehicle body panels, and correcting the simulation model based on the comparison results to ensure that the simulation model and the test results of the vehicle body panels are within the error range includes:

[0024] The simulation model and the various pressure loading points of the body panel are pressure-loaded to the preset pressure value.

[0025] The initial stiffness is calculated using the displacement of each pressure loading point under the preset pressure value as a reference value.

[0026] Analyze each pressure loading point where the displacement error exceeds the range to identify the factors affecting the error;

[0027] The simulation model was adjusted to address the factors affecting the error until the displacement error reached an acceptable level.

[0028] Preferably, calibrating the buckling threshold of the simulation model based on the buckling condition of the vehicle body panels includes:

[0029] The loading force-displacement curves were plotted based on the simulation model and the test results of the body panels.

[0030] The stiffness-displacement curves of the simulation model and the body panel are obtained by differentiating the loading force-displacement curve.

[0031] The buckling threshold of the simulation model is determined by the sum of the difference between the stiffness value of the body panel when buckling occurs and the minimum stiffness value in the stiffness-displacement curve and the minimum stiffness value of the simulation model.

[0032] Preferably, the simulation evaluation of the dent resistance of the body panel using the calibrated simulation model includes:

[0033] If the stiffness value of the simulation model exceeds the buckling threshold of the simulation model, it is determined that the simulation model will not buckle, and the anti-dent performance of the body panel meets the requirements.

[0034] If the stiffness value of the simulation model does not exceed the buckling threshold of the simulation model, it is determined that the simulation model will buckle, and the evaluation of the anti-dent performance of the body panel does not meet the requirements.

[0035] Preferably, the error range is 0-20%.

[0036] Preferably, the body panels include an engine hood, fenders, doors, and a trunk lid.

[0037] Secondly, the present invention provides a simulation evaluation device for the dent resistance performance of vehicle body panels, comprising:

[0038] At least one processor; and,

[0039] A memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the processor for performing a simulation evaluation method for the dent resistance performance of a body panel as described in the first aspect.

[0040] In view of the shortcomings of the prior art, the beneficial effects that the present invention can achieve are as follows:

[0041] This invention ensures consistency between the simulation model and the body panel by benchmarking the simulation model against the body panel in terms of structure, test conditions, and pressure loading methods. During the testing process, error influencing factors are identified, analyzed, and addressed to ensure consistency between the simulation model and the measured results of the body panel. Furthermore, the buckling threshold of the simulation model is calibrated based on the buckling condition of the body panel, continuously improving the accuracy of the simulation model and laying the foundation for accurately evaluating the dent resistance of the body panel. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0043] Figure 1 This is a flowchart illustrating a simulation evaluation method for the dent resistance of a vehicle body panel provided in an embodiment of the present invention.

[0044] Figure 2 This is a flowchart illustrating a simulation evaluation method for the dent resistance of a vehicle body panel provided in an embodiment of the present invention.

[0045] Figure 3 This is a flowchart illustrating a simulation evaluation method for the dent resistance of a vehicle body panel provided in an embodiment of the present invention.

[0046] Figure 4 This is a schematic diagram of a fixing method for the left front door during actual testing, provided by an embodiment of the present invention.

[0047] Figure 5 This is a schematic diagram of a method for fixing a simulation model of the left front door provided in an embodiment of the present invention;

[0048] Figure 6 This is a flowchart illustrating a simulation evaluation method for the dent resistance of a vehicle body panel provided in an embodiment of the present invention.

[0049] Figure 7 This is a schematic diagram of the pressure loading point of a simulation model of the left front door provided in an embodiment of the present invention;

[0050] Figure 8 This is a flowchart illustrating a simulation evaluation method for the dent resistance of a vehicle body panel provided in an embodiment of the present invention.

[0051] Figure 9This is a schematic diagram of the loading force-displacement curve at a pressure loading point where the displacement error exceeds the range, provided by an embodiment of the present invention.

[0052] Figure 10 This is a flowchart illustrating a simulation evaluation method for the dent resistance of a vehicle body panel provided in an embodiment of the present invention.

[0053] Figure 11 This is a schematic diagram of the force-displacement curve of a pressure loading point with buckling during actual measurement, provided by an embodiment of the present invention;

[0054] Figure 12 This is a schematic diagram of the force-displacement curve of a pressure loading point with buckling during actual measurement provided by an embodiment of the present invention;

[0055] Figure 13 This is a schematic diagram of the stiffness-displacement curve of a pressure loading point with buckling during actual measurement, provided by an embodiment of the present invention.

[0056] Figure 14 This is a schematic diagram of the stiffness-displacement curve of a pressure loading point with buckling during actual measurement, provided by another embodiment of the present invention;

[0057] Figure 15 This is a schematic diagram of the structure of a simulation evaluation device for the anti-dent performance of a vehicle body panel provided in an embodiment of the present invention. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In addition, the technical features of the various embodiments or individual embodiments provided by the present invention can be arbitrarily combined with each other to form feasible technical solutions. Such combinations are not constrained by the order of steps and / or structural composition patterns, but must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0059] Example 1:

[0060] To address the technical problem of inaccurate simulation evaluation of the dent resistance of body panels due to low accuracy of existing simulation models and large errors between the simulation models and actual measured results, this invention provides a simulation evaluation method for the dent resistance of body panels, such as... Figure 1As shown, it includes:

[0061] S100 compares the simulation model with the structure and test conditions of the body panel to ensure that the simulation model is consistent with the structure and test conditions of the body panel.

[0062] The simulation model refers to a mathematical model suitable for computer processing, drawn using 3D modeling software, used to study vehicle body panels. In computer simulation, the mathematical model must be rewritten into a simulation model before the corresponding computer program can be written and run on the computer. The vehicle body panels are important yet relatively independent components of the car body. In addition to meeting certain functional requirements, their design must also meet certain structural performance requirements such as stiffness and strength. Insufficient stiffness of the body panels can easily lead to increased closing forces, air and water leaks, paint cracking and peeling, and reduced overall vehicle aesthetics. Insufficient stiffness of the body panels will also cause vibration and noise during vehicle operation, reducing ride comfort. In the event of a collision, insufficient stiffness of the body panels will result in greater deformation, which will also affect the effective survival space for the driver and passengers.

[0063] Based on the current main structure of the automobile body and in combination with specific application scenarios, the body coverings include components such as the engine hood, fenders, doors, and trunk lid; among them, the doors are divided into left front door, right front door, left rear door, and right rear door according to their location.

[0064] For ease of understanding, the following description and accompanying diagrams will use the left front door as an example.

[0065] The goal is to ensure that the simulation model is structurally consistent with the vehicle body panels, such as... Figure 2 As shown, it includes:

[0066] S110, obtain the design parameters of the body panel; among which, the design parameters of the body panel include material thickness, size, weld point location and number of weld points.

[0067] The design parameters are obtained in ways including but not limited to those from technical documents such as BOMs, engineering machinery drawings, or product specification design manuals. In order to eliminate other interference items, the simulation model and the body panel must correspond one-to-one when obtaining the body panel.

[0068] Taking the left front door as an example, the welding assembly used in the simulation model and the body panel mainly includes: outer panel, inner panel, anti-collision beam, upper and lower hinges and main structural reinforcement plates, etc. It is necessary to ensure that the structure of the simulation model and the body panel are consistent, that is, to ensure that the material thickness, size, welding point position and number of the above-mentioned components are consistent. If they are inconsistent, the simulation model should be adjusted.

[0069] S120, assign values ​​to the simulation model according to the design parameters of the body panels.

[0070] In practice, the process of assigning values ​​to the simulation model involves configuring the various attributes of the simulation model, and then configuring the design parameters of the aforementioned parts, such as material thickness, size, solder joint position, and number of solder joints, into the simulation model one by one.

[0071] The requirement is to ensure that the simulation model and the test conditions of the vehicle body panels are consistent, such as... Figure 3 As shown, it includes:

[0072] S130, constrain the simulation model by referring to the constraint method of the body panel.

[0073] During the actual test, the left front door was placed flat on the horizontal plane, the hinge was fastened to the tooling stand, and the middle of the inner waistline of the window sill and the upper and lower flanges on the door lock side were supported by the horizontal tooling.

[0074] Similarly, the simulation model adopts the same constraint method.

[0075] like Figure 4 The diagram shown is a schematic diagram of a method for fixing the left front door during actual testing, provided by an embodiment of the present invention.

[0076] like Figure 5 The diagram shown is a schematic diagram of a method for fixing a simulation model of the left front door provided in an embodiment of the present invention.

[0077] S140, a simulation model of the pressure loading head is constructed based on the pressure loading head of the body panel.

[0078] During the actual test, the pressure loading head of the vehicle body panel was a rigid pressure loading head with a diameter of 80mm. The pressure loading head model of the simulation model was constructed with reference to the geometric contour of the pressure loading head of the vehicle body panel.

[0079] S150, the simulation model is subjected to pressure loading in accordance with the pressure loading method of the body panel.

[0080] The pressure loading method of the vehicle body panel is as follows: Figure 6 As shown, it includes:

[0081] S151, determine the number and location of pressure loading points on the body panels.

[0082] During the actual test, the location of the pressure loading point of the body panel was determined by manually selecting a weak point on the surface of the outer panel of the left front door. Generally, 6-10 pressure loading points of the body panel were selected for testing.

[0083] like Figure 7The diagram shown is a schematic diagram of the pressure loading point of a simulation model of the left front door provided in an embodiment of the present invention.

[0084] S152 applies pressure to each pressure loading point through the pressure loading head of the body panel.

[0085] During the actual test, the pressure loading head of the body panel applied a pressure load F to each pressure loading point at a steady and uniform speed of 5 mm / min until the pressure load F = 400 N and then began to unload.

[0086] S153 collects the loading force at each pressure loading point through a force sensor and the displacement at each pressure loading point through a displacement sensor.

[0087] During the pressure loading and unloading process, the force sensor records the changes in the loading force at each pressure loading point throughout the process, and the displacement sensor collects the deformation at each pressure loading point throughout the process.

[0088] Similarly, the simulation model is subjected to pressure loading in the same way as the aforementioned body panel pressure loading method. The pressure loading speed is also uniform at 5 mm / min, and the maximum loading force is 400 N. It is also divided into two steps: pressure loading and pressure unloading.

[0089] S200 compares the simulation model with the test results of the body panels, and corrects the simulation model based on the comparison results to ensure that the simulation model and the test results of the body panels are within the error range.

[0090] In this step, the simulation model test is conducted in a computer environment, while the body panel test is conducted in a real-world testing environment. To ensure the accuracy of the simulation model test, the error range between the simulation model test result and the body panel test result is 0-20%.

[0091] As one implementation method, the simulation model is compared with the test results of the vehicle body panels, and the simulation model is corrected based on the comparison results to ensure that the simulation model and the test results of the vehicle body panels are within the error range. Figure 8 As shown, it includes:

[0092] S210 applies pressure to the simulation model and various pressure loading points of the vehicle body panels to the preset pressure value.

[0093] In actual implementation, the preset pressure value is set to 150N.

[0094] S220, the initial stiffness is calculated using the displacement of each pressure loading point under the preset pressure value as a reference value.

[0095] Table 1 shows a comparison of displacement data at various pressure loading points under a pressure value of 150N.

[0096]

[0097] Table 1

[0098] S230 analyzes each pressure loading point where the displacement error exceeds the range to identify the factors affecting the error.

[0099] As shown in Table 1, it is easy to see that among the pressure loading points numbered 1-7, the pressure loading point with an error exceeding 20% ​​is point 2, while the errors of the remaining pressure loading points are all below 20%.

[0100] like Figure 9 The figure shown is a schematic diagram of the loading force-displacement curve of a pressure loading point with displacement error exceeding the range, provided by an embodiment of the present invention.

[0101] By comparing the pressure loading point No. 2, as the loading force increases, the displacement trends of the loading point in the simulation model and the actual process are basically consistent. Under the same horizontal loading force, the displacement of the simulation model is less than that in the actual process, that is, the anti-dip stiffness of the simulation model is greater than that in the actual process.

[0102] In response to this result, further factors that may affect the anti-dent stiffness of pressure loading point No. 2 are proposed as follows: the inner and outer panels of the left front door have a thinning rate of 5%-10% during the stamping process; the test sample of the left front door near the expansion rubber area of ​​pressure loading point No. 2 differs from the simulation model; there are influences from the expansion rubber material parameters and the position deviation of the loading point.

[0103] Table 2 is a summary table of factors affecting the error at pressure loading point 2.

[0104]

[0105] Table 2

[0106] By analyzing the above errors, it is not difficult to find that the expansion adhesive parameters affect the dent resistance results. Secondly, by identifying the position of the No. 2 pressure loading point, the closer the No. 2 pressure loading point is to the expansion adhesive, the more significant the impact of the expansion adhesive parameter changes on its dent resistance performance. Thirdly, the outer panel thinning rate also affects the dent resistance performance. The influence of the thinning rate can be considered in the early stage of simulation, which can significantly reduce the error between the simulation model and the actual measurement process.

[0107] S240 adjusts the simulation model to process the factors affecting the error until the displacement error reaches an acceptable state.

[0108] Considering the error factors of the above-mentioned expansion adhesive parameters and outer plate thinning rate, the simulation model has been modified to ensure that the simulation model and the test results of the actual measurement process are within the error range. The modified simulation model can be used as the basis model for subsequent calibration of simulation buckling evaluation index.

[0109] It should be noted that although the deviation of the pressure loading point position also affects the concave results, since the position of the pressure loading point cannot be guaranteed to be completely consistent between the simulation analysis and the actual measurement process during the calibration, the error caused by the deviation of the pressure loading point position cannot be avoided and will not be considered in this embodiment.

[0110] S300 calibrates the buckling threshold of the simulation model based on the buckling condition of the body panel, and then uses the calibrated simulation model to evaluate the dent resistance of the body panel.

[0111] The buckling, also known as the "oil tank effect," is an important indicator for evaluating the dent resistance of body panels. In actual testing, the "oil tank effect" is mainly judged by whether instability occurs during pressure loading. Its loading force-displacement curve shows "large displacement" or "sharp turn phenomenon," that is, large displacement or a sharp drop in force occurs under a very small force.

[0112] During the testing process, the simulation model is difficult to determine whether the body panel has become unstable through simulation animation. Therefore, based on the modification of the simulation model in S200, it is necessary to formulate the standard for judging buckling of the simulation model according to the results of the actual test process, so that the simulation model can be used to accurately evaluate the dent resistance of the body panel.

[0113] As one implementation method, the buckling threshold of the simulation model is calibrated based on the buckling condition of the vehicle body panels, such as... Figure 10 As shown, it includes:

[0114] S310: Plot the loading force-displacement curve based on the simulation model and the test results of the body panel.

[0115] like Figure 11 The figure shown is a schematic diagram of the loading force-displacement curve of a pressure loading point with buckling during actual measurement provided by an embodiment of the present invention.

[0116] like Figure 12 The figure shown is a schematic diagram of the loading force-displacement curve of a pressure loading point with buckling during actual measurement provided by an embodiment of the present invention.

[0117] Comparing the loading force-displacement curves of the simulation model and the measured process at the instability locations of pressure loading points 4 and 5, the trend of the curves shows that buckling occurred at both pressure loading points 4 and 5 compared to the measured process, but the buckling phenomenon in the simulation model was not obvious.

[0118] S320, by differentiating the loading force-displacement curve, the stiffness-displacement curves of the simulation model and the body panel are obtained.

[0119] like Figure 13 The figure shown is a schematic diagram of the stiffness-displacement curve of a pressure loading point with buckling during actual measurement, provided by an embodiment of the present invention.

[0120] like Figure 14 The figure shown is a schematic diagram of the stiffness-displacement curve of a pressure loading point with buckling during actual measurement provided by an embodiment of the present invention.

[0121] The derivative of the loading force-displacement curve is preferably obtained by first-order derivative. By differentiating the loading force-displacement curve, the stiffness-displacement curve is obtained. Compared with the loading force-displacement curve, the buckling phenomenon of the simulation model is more intuitive and obvious in the stiffness-displacement curve.

[0122] S330 uses the sum of the difference between the stiffness value of the body panel when buckling and the minimum stiffness value in the stiffness-displacement curve and the minimum stiffness value of the simulation model as the buckling threshold for the simulation model.

[0123] Table 3 shows the buckling data for pressure loading points 4 and 5.

[0124]

[0125] Table 3

[0126] During the actual test, the stiffness value at the pressure loading point No. 4 when buckling occurred was 6.6, the measured minimum stiffness value was 2.7, and the minimum stiffness value of the simulation model was 7.9. At this time, the buckling judgment threshold of the simulation model was (6.6-2.7)+7.9=11.8.

[0127] During the actual test, the stiffness value at the pressure loading point No. 5 when buckling occurred was 8.1, the measured minimum stiffness value was 3.9, and the minimum stiffness value of the simulation model was 10.2. At this time, the buckling judgment threshold of the simulation model was (8.1-3.9)+10.2=14.4.

[0128] Since instability occurred at two pressure loading points, in actual application, the average buckling threshold of points 4 and 5 is taken as the final buckling threshold, i.e. (11.8+14.4) / 2≈13.

[0129] In specific implementation, the simulation evaluation of the dent resistance of the body panel using the calibrated simulation model includes: if the stiffness value of the simulation model exceeds the buckling threshold of the simulation model (the buckling threshold is 13), then the simulation model is determined not to buckle, and the dent resistance of the body panel is evaluated as meeting the requirements; if the stiffness value of the simulation model does not exceed the buckling threshold of the simulation model (the buckling threshold is 13), then the simulation model is determined to buckle, and the dent resistance of the body panel is evaluated as not meeting the requirements.

[0130] Example 2:

[0131] Based on Example 1, and building upon Example 1, as follows: Figure 15 The diagram shown is a structural schematic of a simulation evaluation device for the dent resistance of a vehicle body panel provided in an embodiment of the present invention. The device includes: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores instructions executable by the at least one processor, which are then executed by the processor to perform the simulation evaluation method for the dent resistance of a vehicle body panel as described in Embodiment 1.

[0132] In summary, this invention provides a simulation evaluation method and apparatus for the dent resistance performance of vehicle body panels. By benchmarking the simulation model against the vehicle body panel, the consistency between the simulation model and the vehicle body panel is ensured from multiple aspects such as structure, test conditions, and pressure loading methods. During the testing process, error influencing factors are identified, analyzed, and addressed to ensure the consistency of the test results between the simulation model and the vehicle body panel. Furthermore, the buckling judgment threshold of the simulation model is calibrated based on the buckling condition of the vehicle body panel, continuously improving the accuracy of the simulation model and laying the foundation for accurately evaluating the dent resistance performance of vehicle body panels.

[0133] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0134] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, electronic devices, or computer software program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0135] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, systems, electronic devices, or computer software program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A system that specifies functions in one or more boxes.

[0136] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including an instruction set implemented in a process. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0137] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0138] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

Claims

1. A simulation evaluation method for the dent resistance performance of a vehicle body panel, characterized in that, include: The simulation model is compared with the structure and test conditions of the body panel to ensure that the simulation model is consistent with the structure and test conditions of the body panel. The simulation model is compared with the test results of the body panels, and the simulation model is corrected according to the comparison results to ensure that the simulation model and the test results of the body panels are within the error range. The buckling threshold of the simulation model is calibrated based on the buckling condition of the body panel, and the anti-dent performance of the body panel is evaluated by simulation using the calibrated simulation model. The calibration of the buckling threshold of the simulation model based on the buckling condition of the vehicle body panels includes: The loading force-displacement curves were plotted based on the simulation model and the test results of the body panels. The stiffness-displacement curves of the simulation model and the body panel are obtained by differentiating the loading force-displacement curve. The buckling threshold of the simulation model is determined by the sum of the difference between the stiffness value of the body panel when buckling occurs and the minimum stiffness value in the stiffness-displacement curve and the minimum stiffness value of the simulation model.

2. The simulation evaluation method for the dent resistance of vehicle body panels according to claim 1, characterized in that, Ensuring that the simulation model is structurally consistent with the body panels includes: Obtain the design parameters of the body panel; the design parameters of the body panel include material thickness, size, weld point location and number of weld points; The simulation model was assigned values ​​based on the design parameters of the vehicle body panels.

3. The simulation evaluation method for the dent resistance of vehicle body panels according to claim 1, characterized in that, Ensuring that the simulation model and the test conditions of the vehicle body panels are consistent includes: The simulation model is constrained by referring to the constraint method of the vehicle body panels; The pressure loading head of the vehicle body panel is used to construct a simulation model of the pressure loading head. The simulation model was subjected to pressure loading, referencing the pressure loading method used for vehicle body panels.

4. The simulation evaluation method for the dent resistance of vehicle body panels according to claim 3, characterized in that, The pressure loading methods for the vehicle body panels include: Determine the number and location of pressure loading points on the vehicle body panels; Pressure is applied to each pressure loading point using a pressure loading head on the body panel. The force at each pressure loading point is collected by a force sensor, and the displacement at each pressure loading point is collected by a displacement sensor.

5. The simulation evaluation method for the dent resistance of vehicle body panels according to claim 4, characterized in that, The process of comparing the simulation model with the test results of the vehicle body panels, and correcting the simulation model based on the comparison results to ensure that the simulation model and the test results of the vehicle body panels are within the error range includes: The simulation model and the various pressure loading points of the body panel are pressure-loaded to the preset pressure value. The initial stiffness is calculated using the displacement of each pressure loading point under the preset pressure value as a reference value. Analyze each pressure loading point where the displacement error exceeds the range to identify the factors affecting the error; The simulation model was adjusted to address the factors affecting the error until the displacement error reached an acceptable level.

6. The simulation evaluation method for the dent resistance of vehicle body panels according to claim 1, characterized in that, The simulation evaluation of the dent resistance of the body panels using the calibrated simulation model includes: If the stiffness value of the simulation model exceeds the buckling threshold of the simulation model, it is determined that the simulation model will not buckle, and the anti-dent performance of the body panel meets the requirements. If the stiffness value of the simulation model does not exceed the buckling threshold of the simulation model, it is determined that the simulation model will buckle, and the evaluation of the anti-dent performance of the body panel does not meet the requirements.

7. The simulation evaluation method for the dent resistance of vehicle body panels according to claim 1, characterized in that, The error range is 0-20%.

8. The simulation evaluation method for the dent resistance of vehicle body panels according to claim 1, characterized in that, The body panels include the hood, fenders, doors, and trunk lid.

9. A simulation evaluation device for the dent resistance performance of a vehicle body panel, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the processor for performing a simulation evaluation method for the dent resistance performance of a body panel as described in any one of claims 1-8.

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