Impact test method, computer equipment and computer program product

Abstract

The invention provides an impact test method, computer equipment and a computer program product, and the method can carry out the modeling through employing a three-dimensional model of a vehicle and a to-be-installed human head, obtains an impact test finite element model, and carries out the simulation impact test through employing the impact test finite element model. In this way, the accuracy of the obtained damage information is higher, the content coverage is wider, the test result is closer to the actual situation, the test difficulty is reduced, and meanwhile the accuracy of the test result is improved. Meanwhile, in the simulation impact test process, when the engine cover model bounces to the target height for the first time, connection between the fixing plate sub-model and the human head sub-model is removed, the impact process can better meet the actual situation, and the test accuracy is further improved.

Description

Technical Field

[0001] The present disclosure relates to the field of automobile technology, and in particular to a collision test method, a computer device, and a computer program product. Background Art

[0002] Pedestrian protection is a very important topic in the automotive field, especially in terms of automotive design and traffic safety. Pedestrian protection usually involves taking various measures to reduce the damage to pedestrians when they collide with cars or to avoid collisions. Impact testing is an important means to evaluate the ability of a car to protect pedestrians when it collides with them. This test simulates various scenarios when a vehicle collides with pedestrians to evaluate the potential harm to pedestrians caused by vehicle design. Among them, head impacts usually pose a higher threat to pedestrians, so testing for head impacts is particularly important.

[0003] At present, head impact tests usually use a head dummy model (usually a spherical object that simulates the head of an adult or child) to hit the front of the vehicle at a specific speed. By measuring the acceleration and stress of the head, the protective effect of the vehicle design on the pedestrian's head can be judged. However, in the impact test, the structure and behavior of the head in the collision are very complex, the test is difficult, and the test accuracy is low. Summary of the invention

[0004] The embodiments of the present disclosure at least provide a collision test method, a computer device, and a computer program product.

[0005] In a first aspect, an embodiment of the present disclosure provides a collision test method, comprising:

[0006] Obtain a first three-dimensional model of a test vehicle and a second three-dimensional model of a human head to be impacted; the first three-dimensional model includes a hood model, a body sub-model, a limiter sub-model and a detonator sub-model; the limiter sub-model is used to connect the hood model and the body sub-model, and to limit the hood model; the detonator sub-model is used to pop up the hood model; the second three-dimensional model includes a fixed plate model and a human head sub-model; the fixed plate model is used to fix the human head sub-model

[0007] Establishing a collision test finite element model corresponding to the first three-dimensional model and the second three-dimensional model; the human head sub-model in the collision test finite element model is located at a preset position above the engine cover model;

[0008] The impact test finite element model is used to perform a simulated impact test; the simulated impact test includes controlling the detonator sub-model in the impact test finite element model to ignite, and when the engine cover model first bounces up to a target height, releasing the connection between the fixed plate sub-model and the human head sub-model;

[0009] The force applied to the human head sub-model during the impact test is analyzed to determine the damage information received by the human head sub-model when the human head sub-model collides with the engine cover model.

[0010] In an optional implementation manner, the preset position is determined according to the following steps:

[0011] Based on the height information of the pedestrian to be tested, determining the collision position of the engine hood model with the human head sub-model when the engine hood model is not popped up;

[0012] The preset position is determined based on the collision position, the highest pop-up height of the engine cover model, and a preset gap height.

[0013] In an optional implementation manner, the target height is determined according to the following steps:

[0014] The target height is determined based on a maximum pop-up height of the hood model.

[0015] In an optional implementation manner, the damage information suffered by the human head sub-model is determined by the following steps:

[0016] Determine a resultant acceleration between a first moment and a second moment when the human head sub-model collides with the engine hood model;

[0017] determining an integral of the resultant acceleration over a time interval between a first moment and a second moment;

[0018] Based on the ratio between the integral and the time interval, the power coefficient corresponding to the ratio, and the time interval, the damage information suffered by the human head sub-model is determined.

[0019] In an optional implementation manner, the method further includes:

[0020] Determining a target bounce time corresponding to the engine cover model based on the damage information received by the human head sub-model;

[0021] Based on the target pop-up time, the parameters of the detonator sub-model are adjusted to obtain adjustment recommendation information for the detonator.

[0022] In an optional embodiment, the first three-dimensional sub-model further includes a sealing strip sub-model; the sealing strip sub-model abuts against the engine cover model and the vehicle body sub-model;

[0023] The sealing strip sub-model in the impact test finite element model is established by the following steps:

[0024] Based on the cross-section information of the sealing strip sub-model in the first three-dimensional sub-model, a simplified finite element model corresponding to the cross-section of the sealing strip sub-model is constructed; the simplified finite element model includes a one-dimensional unit with a stiffness curve feature, a first two-dimensional unit representing a contact surface between the sealing strip sub-model and the engine cover model, and a second two-dimensional unit representing a contact surface between the sealing strip sub-model and the vehicle body sub-model; the first two-dimensional unit and the second two-dimensional unit have elastic material properties; the first two-dimensional unit and the second two-dimensional unit move along the axial direction of the one-dimensional unit when subjected to force;

[0025] Determining a target number of the simplified finite element models based on the length of the sealing strip sub-model and the simulation accuracy of the sealing strip sub-model;

[0026] The simplified finite element models of a target number are arranged to obtain the sealing strip sub-model in the impact test finite element model.

[0027] In an optional implementation, determining the target number of simplified finite element models based on the length of the sealing strip sub-model and the simulation accuracy of the sealing strip sub-model includes:

[0028] Determining a target spacing between simplified finite element models based on a simulation accuracy for the sealing strip sub-model;

[0029] Based on the length of the sealing strip sub-model and the target spacing, a target number of the simplified finite element model is determined.

[0030] In an optional implementation, the stiffness curve characteristics of the one-dimensional unit are determined according to the following steps:

[0031] Performing a compression test on the sealing strip to be tested to obtain stiffness information of the sealing strip to be tested;

[0032] Based on the stiffness information and the target quantity of the simplified finite element model, a stiffness curve characteristic of a one-dimensional element in the simplified finite element model is determined.

[0033] In a second aspect, an optional implementation of the present disclosure further provides a computer device, a processor, and a memory, wherein the memory stores machine-readable instructions executable by the processor, and the processor is used to execute the machine-readable instructions stored in the memory, and when the machine-readable instructions are executed by the processor, the machine-readable instructions perform the steps in the above-mentioned first aspect, or any possible implementation of the first aspect.

[0034] In a third aspect, an optional implementation of the present disclosure further provides a computer program product, which, when executed, executes the steps of the above-mentioned first aspect, or any possible implementation of the first aspect.

[0035] For a description of the effects of the above-mentioned computer device and computer program product, please refer to the description of the above-mentioned impact test method, which will not be repeated here.

[0036] The impact test method, computer device, and computer program product provided by the embodiments of the present disclosure can be modeled using the three-dimensional models of the vehicle and the human head to be installed to obtain an impact test finite element model, and the impact test finite element model is used to perform a simulated impact test to obtain the damage information suffered by the human head sub-model. The damage information obtained in this way is more accurate, covers a wider range of content, and the test results are closer to the actual situation, which reduces the difficulty of the test and improves the accuracy of the test results. At the same time, in the process of simulating the impact test, by releasing the connection between the fixed plate model and the human head sub-model when the engine cover model first bounces up to the target height, the impact process can be made more in line with the actual situation, further improving the accuracy of the test.

[0037] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following is a brief introduction to the drawings required for use in the embodiments. The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present disclosure and are used together with the specification to illustrate the technical solutions of the present disclosure. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can also be obtained based on these drawings without creative work.

[0039] Figure 1 A flow chart of a collision test method provided by an embodiment of the present disclosure is shown;

[0040] Figure 2One of the schematic diagrams of the first three-dimensional model and the second three-dimensional model provided by the embodiment of the present disclosure is shown;

[0041] Figure 3 A second schematic diagram showing a first three-dimensional model and a second three-dimensional model provided by an embodiment of the present disclosure;

[0042] Figure 4 A schematic diagram of a sealing strip model provided by an embodiment of the present disclosure is shown;

[0043] Figure 5 A schematic diagram showing a sealing strip model provided by an embodiment of the present disclosure in a vehicle is shown;

[0044] Figure 6 A schematic diagram of a simplified finite element model provided by an embodiment of the present disclosure is shown;

[0045] Figure 7 A schematic diagram showing a sealing strip sub-model in the impact test finite element model provided by an embodiment of the present disclosure

[0046] Figure 8 A schematic diagram of the structure of a computer device provided by an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure generally described and shown herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure is not intended to limit the scope of the present disclosure claimed for protection, but merely represents the selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present disclosure.

[0048] In addition, the terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0049] The "multiple or several" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0050] Research has found that head impact tests usually use a head dummy model (usually a spherical object that simulates the head of an adult or child) to hit the front of the vehicle at a specific speed. By measuring the acceleration and stress of the head, the protective effect of the vehicle design on the pedestrian's head can be judged. However, in the impact test, the structure and behavior of the head in a collision are very complex, the test is difficult, and the test accuracy is low.

[0051] Based on the above research, the present disclosure provides a collision test method, computer equipment and computer program product, which can use the three-dimensional model of the vehicle and the human head to be installed to build a model, obtain a collision test finite element model, and use the collision test finite element model to perform a simulated collision test to obtain the damage information suffered by the human head sub-model. The damage information obtained in this way is more accurate, covers a wider range of content, and the test results are closer to the actual situation, which reduces the difficulty of the test and improves the accuracy of the test results. At the same time, in the process of simulating the collision test, by releasing the connection between the fixed plate model and the human head sub-model when the engine cover model first bounces up to the target height, the collision process can be made more in line with the actual situation, further improving the accuracy of the test.

[0052] The defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure for the above problems below should be the contributions made by the inventor to the present disclosure during the disclosure process.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] To facilitate understanding of this embodiment, a collision test method disclosed in the embodiment of the present disclosure is first introduced in detail. The executor of the collision test method provided in the embodiment of the present disclosure is generally a terminal device or other processing device with certain computing capabilities; in some possible implementation methods, the collision test method can be implemented by a processor calling computer-readable instructions stored in a memory.

[0055] The impact test method provided by the embodiment of the present disclosure is described below by taking the execution subject as a terminal device as an example.

[0056] like Figure 1 As shown, it is a flowchart of a collision test method provided by an embodiment of the present disclosure, which may include the following steps:

[0057] S101. Obtain a first three-dimensional model of a test vehicle and a second three-dimensional model of a human head to be impacted; the first three-dimensional model includes a hood model, a body sub-model, a limiter sub-model and a detonator sub-model; the limiter sub-model is used to connect the hood model and the body sub-model, and to limit the hood model; the detonator sub-model is used to pop up the hood model; the second three-dimensional model includes a fixed plate model and a human head sub-model; the fixed plate model is used to fix the human head sub-model.

[0058] In order to perform a head impact test, the models of the objects involved in the impact in the test can be obtained first. The objects involved in the impact can usually be a test vehicle and a human head to be impacted. Then, a first three-dimensional model of the test vehicle and a second three-dimensional model of the human head to be impacted can be obtained.

[0059] In order to improve the consistency between the simulation test and the actual situation, the first three-dimensional model of the test vehicle can be composed of multiple sub-models, so as to reflect the interaction between vehicle components during the test process and improve the accuracy of the simulation test.

[0060] In the disclosed embodiment, the first three-dimensional model of the test vehicle may include an engine cover model, a vehicle body sub-model, a stopper sub-model, and an initiator sub-model, and the second three-dimensional model includes a fixing plate sub-model and a human head sub-model. Figure 2 as well as Figure 3 As shown, Figure 2 One of the schematic diagrams of the first three-dimensional model and the second three-dimensional model provided in the embodiment of the present disclosure, Figure 3 The second schematic diagram of the first three-dimensional model and the second three-dimensional model provided by the embodiment of the present disclosure. Among them, the hood model 211 is fixed on the stopper sub-model 221, the stopper sub-model 221 is fixed on the vehicle body sub-model 231, the detonator sub-model 241 is fixed on the vehicle body sub-model 231, the stopper sub-model 221 is located below the side of the hood model 211 close to the front windshield, the detonator sub-model 241 is fixed below the side of the hood model 211 close to the front windshield, and the human head sub-model 251 is fixed below the fixed plate sub-model 252 by node binding. During the simulation test, when the detonator sub-model 241 is ignited and detonated, the hood model 211 is affected by the detonation, and the side close to the front windshield will bounce upwards, thereby reducing the damage value of the human head sub-model 251 when the hood model 211 collides with the human head sub-model 251.

[0061] S102, establishing an impact test finite element model corresponding to the first three-dimensional model and the second three-dimensional model; the human head sub-model in the impact test finite element model is located at a preset position above the engine cover model.

[0062] After obtaining the first three-dimensional model and the second three-dimensional model, a collision test finite element model corresponding to the first three-dimensional model and the second three-dimensional model can be established. Finite element model (FEM) is an engineering analysis method used to solve complex structural mechanics problems. It divides a complex structure into a limited number of simple geometric units, and then performs mechanical modeling and analysis on each unit. By solving these units, important parameters such as stress, strain, displacement, etc. of the overall structure can be obtained, thereby evaluating the safety and performance of the structure.

[0063] Exemplarily, the first three-dimensional model and the second three-dimensional model can be simplified to a certain extent to remove unnecessary details, such as small holes, chamfers, or tiny curved surfaces, to reduce the complexity of the calculation. Afterwards, the model can be imported into the finite element analysis software, and the finite element analysis software is used to select the appropriate unit type and mesh the model to divide the model into a limited number of small units. The density and quality of the mesh will affect the accuracy and calculation time of the calculation results. At the same time, corresponding material properties, such as elastic modulus, Poisson's ratio, density, etc., can also be assigned to different parts in the model. The boundary conditions and loads of the model can also be defined, such as fixed supports, applied external forces, pressures, temperatures, etc. The boundary conditions determine the force and deformation behavior of the model during the analysis process.

[0064] After the impact test finite element model is obtained, the impact test finite element model can be used to perform simulation tests.

[0065] In the finite element model of the installed test, the human head sub-model can be located at a preset position above the engine cover model. The preset position can be set according to the requirements of the simulation test.

[0066] In a possible implementation manner, the preset position may be determined according to the following steps:

[0067] Based on the height information of the pedestrian to be tested, determining the collision position of the engine hood model with the human head sub-model when the engine hood model is not popped up;

[0068] The preset position is determined based on the collision position, the highest pop-up height of the engine cover model, and a preset gap height.

[0069] Exemplarily, the collision position may be a three-dimensional coordinate, including a horizontal coordinate, a vertical coordinate and a vertical coordinate. The horizontal coordinate and the vertical coordinate of the preset position may be consistent with the collision position, and the vertical coordinate of the preset position may be the sum of the vertical coordinate of the collision position, the highest bounce height and the preset gap height.

[0070] The above-mentioned preset gap height may refer to the height of the preset gap between the human head sub-model and the engine cover model.

[0071] In this way, the preset position of the second three-dimensional model can be configured according to the height information of the pedestrian to be tested, so that the simulation test results are more in line with the test requirements.

[0072] S103, performing a simulated impact test using the impact test finite element model; the simulated impact test includes controlling the detonator sub-model in the impact test finite element model to ignite, and releasing the connection between the fixed plate sub-model and the human head sub-model when the engine cover model pops up to the target height for the first time.

[0073] In this step, the impact test finite element model can be used for simulation testing. During the simulation test, the detonator sub-model can be controlled to ignite first. When the engine hood model is affected by the ignition and bounces up to the target height for the first time, the connection between the fixed plate model and the human head sub-model is released, so that the human head sub-model starts to fall and collides with the bounced engine hood model.

[0074] After the detonator sub-model is ignited and detonated, the engine cover model will be bounced up by the blast caused by the ignition. The limiter sub-model can limit the maximum and minimum heights of the engine cover model. After the engine cover model bounces up to the maximum height, it begins to fall. After falling to the minimum height, it will bounce up again, and bounce up and fall repeatedly until the engine cover model is stable. In this process, the human head model may collide with the engine cover model.

[0075] Usually, in a vehicle collision test, when the human head model collides with the hood, the hood is already in a stable state (that is, it is stationary relative to the vehicle body), and its height remains at the lowest height corresponding to the limiter. The principle is to first lift up the hood, and then launch the human head model to hit the hood, so as to obtain the head injury value. However, the disadvantage of this method is that it cannot dynamically simulate the process of launching the human head model while the hood pops up. The head injury value obtained by this static analysis method is often too small, which is quite different from the actual test value.

[0076] To this end, the embodiment of the present disclosure uses a finite element model to release the connection between the fixed plate model and the human head sub-model when the hood model first pops up to the target height, thereby simulating a collision during the pop-up process of the hood model, and the test results are closer to the actual situation.

[0077] The above-mentioned target height is used to trigger the launch of the human head model. When the human head model is launched, the connection between the fixed board model and the human head sub-model is released. At the same time, a certain initial velocity and / or acceleration can be given to the human head model, and the given initial velocity and / or acceleration can be set according to actual needs.

[0078] The target height may be determined based on the highest pop-up height of the engine cover model. In a possible implementation, the highest pop-up height may be directly set as the target height.

[0079] S104: Analyze the force applied to the human head sub-model during the impact test to determine damage information received by the human head sub-model when the human head sub-model collides with the engine cover model.

[0080] In this step, the data stored in each unit of the human head sub-model can be read, and the injury information suffered by the human head sub-model can be determined according to the read data.

[0081] In one possible implementation, the composite acceleration between the first moment and the second moment when the human head sub-model collides with the engine hood model can be determined; then, the integral of the composite acceleration over the time interval between the first moment and the second moment is determined; finally, based on the ratio between the integral and the time interval, the power coefficient corresponding to the ratio, and the time interval, the damage information suffered by the human head sub-model is determined.

[0082] Specifically, the damage information of the human head sub-model can be determined according to the following formula:

[0083]

[0084] Among them, HIC is the damage information of the human head sub-model, a is the synthetic acceleration, t1 is the first moment, t2 is the second moment, and 2.5 is the power coefficient.

[0085] In a possible implementation manner, the time interval between the first moment and the second moment may be in a range of less than or equal to 15 ms.

[0086] After obtaining the damage information, the pop-up time of the hood model can be optimized to determine the target pop-up time corresponding to the hood model. The damage information of the human head sub-model is usually related to the state of the hood model when it pops up. If the hood model pops up slowly, that is, the hood model is still in the process of popping up, the human head sub-model starts to hit the hood model, which will cause the human head sub-model to suffer a large damage value. Therefore, when the damage information of the human head sub-model is high, the pop-up speed of the hood model can be increased to determine the target pop-up time.

[0087] After the target bounce time is obtained, the parameters of the detonator sub-model can be adjusted based on the target bounce time to obtain adjustment recommendation information for the detonator, thereby adjusting the detonator of the vehicle to reduce the damage to pedestrians in the event of a collision.

[0088] In a possible implementation, the first three-dimensional model may further include a sealing strip sub-model. The sealing strip sub-model may be located between the hood model and the vehicle body sub-model, and may play the role of sealing, waterproofing, sound insulation, shock absorption, etc. In some cases, the sealing strip may also reduce the damage to pedestrians in a collision between a vehicle and a pedestrian by absorbing collision energy, especially providing a certain buffering effect in a head collision. Therefore, it is necessary to consider the influence of the sealing strip in the impact test.

[0089] See also Figure 4 as well as Figure 5 The figures are respectively a schematic diagram of a sealing strip model provided in an embodiment of the present disclosure and a schematic diagram of the sealing strip model in a vehicle. Figure 5 In the embodiment, the sealing strip sub-model is located between the inner plate of the hood model and the sealing strip mounting plate, and the sealing strip mounting plate is fixed to the vehicle body sub-model.

[0090] In order to improve the efficiency of finite element simulation testing and reduce calculation time, the sealing strip model can be simplified to obtain a simplified sealing strip model.

[0091] In a possible implementation, the sealing strip sub-model in the impact test finite element model may be established by the following steps:

[0092] Based on the cross-section information of the sealing strip sub-model in the first three-dimensional sub-model, a simplified finite element model corresponding to the cross-section of the sealing strip sub-model is constructed; the simplified finite element model includes a one-dimensional unit with a stiffness curve feature, a first two-dimensional unit representing a contact surface between the sealing strip sub-model and the engine cover model, and a second two-dimensional unit representing a contact surface between the sealing strip sub-model and the vehicle body sub-model; the first two-dimensional unit and the second two-dimensional unit have elastic material properties; the first two-dimensional unit and the second two-dimensional unit move along the axial direction of the one-dimensional unit when subjected to force;

[0093] Determining a target number of the simplified finite element models based on the length of the sealing strip sub-model and the simulation accuracy of the sealing strip sub-model;

[0094] The simplified finite element models of a target number are arranged to obtain the sealing strip sub-model in the impact test finite element model.

[0095] In this step, the sealing strip sub-model can be simplified into a simplified finite element model of multiple segments. In the simplification process, modeling can be performed based on the cross section of the sealing strip sub-model. Through the cross section information of the sealing strip sub-model, the cross section size of the sealing strip sub-model can be obtained. According to the height information indicated by the cross section size, a one-dimensional unit representing the cross section, a first two-dimensional unit representing the contact surface between the sealing strip sub-model and the engine cover model, and a second two-dimensional unit representing the contact surface between the sealing strip sub-model and the vehicle body sub-model can be constructed.

[0096] In order to restore the characteristics of the sealing strip, the one-dimensional unit can be set to have a stiffness curve characteristic, thereby reflecting the stiffness characteristics of the sealing strip. For the first two-dimensional unit and the second two-dimensional unit, they can be set to have elastic material characteristics, such as setting them as shell units, so that they have characteristics similar to the surface of the sealing strip.

[0097] The first two-dimensional unit and the second two-dimensional unit of the simplified finite element model can move along the axial direction of the one-dimensional unit when subjected to pressure, so that the one-dimensional unit is compressed. The movement distance is affected by the magnitude and direction of the force and the stiffness curve characteristics of the one-dimensional unit. The one-dimensional unit can be provided with three-dimensional degrees of freedom.

[0098] After obtaining the simplified finite element model capable of representing the cross section, multiple groups of simplified finite element models may be combined to form a sealing strip sub-model in the impact test finite element model capable of representing the sealing strip.

[0099] In this step, the target number of simplified finite element models may be determined first, so as to select a suitable number of simplified finite element models to form the sealing strip sub-model in the impact test finite element model.

[0100] The target number can be determined according to the length of the sealing strip sub-model and the simulation accuracy of the sealing strip sub-model. For example, the spacing between simplified finite element models can be determined according to the simulation accuracy of the sealing strip sub-model, and then the target number can be determined according to the ratio between the length and spacing of the sealing strip sub-model.

[0101] The smaller the spacing between the simplified finite element models, the higher the simulation accuracy. According to the preset simulation accuracy, the spacing between the simplified finite element models can be determined, and then the target number can be determined.

[0102] Exemplarily, the spacing between the simplified finite element models may be 10 mm.

[0103] After obtaining the above target number, the simplified finite element models of the target number can be arranged to obtain the sealing strip model in the impact test finite element model.

[0104] See also Figure 6 as well as Figure 7 , which are respectively a schematic diagram of a simplified finite element model provided in an embodiment of the present disclosure and a schematic diagram of a sealing strip sub-model in a collision test finite element model.

[0105] Figure 6 In the simplified finite element model, the simplified finite element model includes a one-dimensional unit 611 , a first two-dimensional unit 621 , and a second two-dimensional unit 622 . Figure 7 In FIG. 7 , the sealing strip sub-model 711 in the impact test finite element model is located between the inner panel of the hood model and the sealing strip mounting plate of the vehicle body sub-model.

[0106] When setting the stiffness curve characteristics of the one-dimensional unit, a press test can be performed on the sealing strip to be tested to obtain the stiffness information of the sealing strip to be tested. Afterwards, the stiffness curve characteristics of the one-dimensional unit in the simplified model finite element can be determined based on the stiffness information and the target number of the simplified finite element model.

[0107] Exemplarily, the stiffness information of the sealing strip to be tested is determined based on the ratio between the compression test and the displacement of the sealing strip to be tested along the force direction, and then the sum of the stiffness information of the one-dimensional units of each simplified finite element model is made equal to the stiffness information of the sealing strip to be tested, thereby determining the stiffness information of each one-dimensional unit and obtaining the stiffness curve characteristics of the one-dimensional unit.

[0108] The impact test method provided by the embodiment of the present disclosure can use the three-dimensional model of the vehicle and the human head to be installed to build a model, obtain the impact test finite element model, and use the impact test finite element model to perform a simulated impact test to obtain the damage information suffered by the human head sub-model. The damage information obtained in this way has higher accuracy and wider content coverage, and the test results are closer to the actual situation, which reduces the difficulty of the test and improves the accuracy of the test results. At the same time, in the process of simulating the impact test, by releasing the connection between the fixed plate model and the human head sub-model when the engine cover model first bounces up to the target height, the impact process can be made more in line with the actual situation, further improving the accuracy of the test.

[0109] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0110] Based on the same technical concept, the embodiment of the present application also provides a computer device. Figure 8 FIG. 1 is a schematic diagram of a computer device provided in an embodiment of the present application, including:

[0111] Processor 801, memory 802 and bus 803. The memory 802 stores machine-readable instructions executable by the processor 801, and the processor 801 is used to execute the machine-readable instructions stored in the memory 802. When the machine-readable instructions are executed by the processor 801, the processor 801 performs the following steps:

[0112] Obtain a first three-dimensional model of a test vehicle and a second three-dimensional model of a human head to be impacted; the first three-dimensional model includes a hood model, a body sub-model, a limiter sub-model and a detonator sub-model; the limiter sub-model is used to connect the hood model and the body sub-model, and to limit the hood model; the detonator sub-model is used to pop up the hood model; the second three-dimensional model includes a fixed plate model and a human head sub-model; the fixed plate model is used to fix the human head sub-model

[0113] Establishing a collision test finite element model corresponding to the first three-dimensional model and the second three-dimensional model; the human head sub-model in the collision test finite element model is located at a preset position above the engine cover model;

[0114] The impact test finite element model is used to perform a simulated impact test; the simulated impact test includes controlling the detonator sub-model in the impact test finite element model to ignite, and when the engine cover model first bounces up to a target height, releasing the connection between the fixed plate sub-model and the human head sub-model;

[0115] The force applied to the human head sub-model during the impact test is analyzed to determine the damage information received by the human head sub-model when the human head sub-model collides with the engine cover model.

[0116] In an optional implementation manner, the processor 801 is further configured to execute:

[0117] Based on the height information of the pedestrian to be tested, determining the collision position of the engine hood model with the human head sub-model when the engine hood model is not popped up;

[0118] The preset position is determined based on the collision position, the highest pop-up height of the engine cover model, and a preset gap height.

[0119] In an optional implementation manner, the processor 801 is further configured to execute:

[0120] The target height is determined based on a maximum pop-up height of the hood model.

[0121] In an optional implementation manner, the processor 801 is further configured to execute:

[0122] Determine a resultant acceleration between a first moment and a second moment when the human head sub-model collides with the engine hood model;

[0123] determining an integral of the resultant acceleration over a time interval between a first moment and a second moment;

[0124] Based on the ratio between the integral and the time interval, the power coefficient corresponding to the ratio, and the time interval, the damage information suffered by the human head sub-model is determined.

[0125] In an optional implementation manner, the processor 801 is further configured to execute:

[0126] Determining a target bounce time corresponding to the engine cover model based on the damage information received by the human head sub-model;

[0127] Based on the target pop-up time, the parameters of the detonator sub-model are adjusted to obtain adjustment recommendation information for the detonator.

[0128] In an optional embodiment, the first three-dimensional sub-model further includes a sealing strip sub-model; the sealing strip sub-model abuts against the engine cover model and the vehicle body sub-model;

[0129] The processor 801 is further configured to execute:

[0130] Based on the cross-section information of the sealing strip sub-model in the first three-dimensional sub-model, a simplified finite element model corresponding to the cross-section of the sealing strip sub-model is constructed; the simplified finite element model includes a one-dimensional unit with a stiffness curve feature, a first two-dimensional unit representing a contact surface between the sealing strip sub-model and the engine cover model, and a second two-dimensional unit representing a contact surface between the sealing strip sub-model and the vehicle body sub-model; the first two-dimensional unit and the second two-dimensional unit have elastic material properties; the first two-dimensional unit and the second two-dimensional unit move along the axial direction of the one-dimensional unit when subjected to force;

[0131] Determining a target number of the simplified finite element models based on the length of the sealing strip sub-model and the simulation accuracy of the sealing strip sub-model;

[0132] The simplified finite element models of a target number are arranged to obtain the sealing strip sub-model in the impact test finite element model.

[0133] In an optional implementation manner, in the instructions executed by the processor 801, determining the target number of simplified finite element models based on the length of the sealing strip sub-model and the simulation accuracy of the sealing strip sub-model includes:

[0134] Determining a target spacing between simplified finite element models based on a simulation accuracy for the sealing strip sub-model;

[0135] Based on the length of the sealing strip sub-model and the target spacing, a target number of the simplified finite element model is determined.

[0136] In an optional implementation manner, the processor 801 is further configured to execute:

[0137] Performing a compression test on the sealing strip to be tested to obtain stiffness information of the sealing strip to be tested;

[0138] Based on the stiffness information and the target quantity of the simplified finite element model, a stiffness curve characteristic of a one-dimensional element in the simplified finite element model is determined.

[0139] The above-mentioned memory 802 includes a memory 8021 and an external memory 8022; the memory 8021 here is also called an internal memory, which is used to temporarily store the calculation data in the processor 801, as well as the data exchanged with the external memory 8022 such as a hard disk. The processor 801 exchanges data with the external memory 8022 through the memory 8021. When the computer device is running, the processor 801 communicates with the memory 802 through the bus 803, so that the processor 801 executes the execution instructions mentioned in the above-mentioned method embodiment.

[0140] The present disclosure also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the impact test method described in the above method embodiment are executed. The storage medium can be a volatile or non-volatile computer-readable storage medium.

[0141] The computer program product of the impact test method provided in the embodiment of the present disclosure includes a computer-readable storage medium storing program code, and the instructions included in the program code can be used to execute the steps of the impact test method described in the above method embodiment. Please refer to the above method embodiment for details, which will not be repeated here.

[0142] The computer program product may be implemented in hardware, software or a combination thereof. In one optional embodiment, the computer program product is embodied as a computer storage medium, and in another optional embodiment, the computer program product is embodied as a software product, such as a software development kit (SDK) and the like.

[0143] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present disclosure, it should be understood that the disclosed device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0144] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0145] In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0146] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present disclosure, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present disclosure. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0147] If the technical solution of this application involves personal information, the product using the technical solution of this application has clearly informed the personal information processing rules and obtained the individual's voluntary consent before processing the personal information. If the technical solution of this application involves sensitive personal information, the product using the technical solution of this application has obtained the individual's separate consent before processing the sensitive personal information, and at the same time meets the "explicit consent" requirement. For example, on personal information collection devices such as cameras, clear and prominent signs are set to inform that the personal information collection scope has been entered and personal information will be collected. If the individual voluntarily enters the collection scope, it is deemed that he or she agrees to the collection of his or her personal information; or on the device that processes personal information, the personal information processing rules are notified by obvious signs / information, and the individual's authorization is obtained through pop-up information or by asking the individual to upload his or her personal information; among them, the personal information processing rules may include information such as the personal information processor, the purpose of personal information processing, the processing method, and the type of personal information processed.

[0148] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present disclosure, which are used to illustrate the technical solutions of the present disclosure, rather than to limit them. The protection scope of the present disclosure is not limited thereto. Although the present disclosure is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present disclosure, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A collision test method, characterized in that: include: Obtaining a first three-dimensional model of a test vehicle and a second three-dimensional model of a human head to be impacted; The first three-dimensional model includes a hood model, a vehicle body sub-model, a stopper sub-model and a detonator sub-model; the stopper sub-model is used to connect the hood model and the vehicle body sub-model, and to limit the hood model; the detonator sub-model is used to pop up the hood model; the second three-dimensional model includes a fixing plate model and a human head sub-model; the fixing plate model is used to fix the human head sub-model; Establishing a collision test finite element model corresponding to the first three-dimensional model and the second three-dimensional model; the human head sub-model in the collision test finite element model is located at a preset position above the engine cover model; The impact test finite element model is used to perform a simulated impact test; the simulated impact test includes controlling the detonator sub-model in the impact test finite element model to ignite, and when the engine cover model first bounces up to a target height, releasing the connection between the fixed plate sub-model and the human head sub-model; The force applied to the human head sub-model during the impact test is analyzed to determine the damage information received by the human head sub-model when the human head sub-model collides with the engine cover model.

2. The method according to claim 1, characterized in that The preset position is determined according to the following steps: Based on the height information of the pedestrian to be tested, determining the collision position of the engine hood model with the human head sub-model when the engine hood model is not popped up; The preset position is determined based on the collision position, the highest pop-up height of the engine cover model, and a preset gap height.

3. The method according to claim 2, characterized in that The target height is determined according to the following steps: The target height is determined based on a maximum pop-up height of the hood model.

4. The method according to claim 1, characterized in that: The damage information of the human head sub-model is determined by the following steps: Determine a resultant acceleration between a first moment and a second moment when the human head sub-model collides with the engine hood model; determining an integral of the resultant acceleration over a time interval between a first moment and a second moment; Based on the ratio between the integral and the time interval, the power coefficient corresponding to the ratio, and the time interval, the damage information suffered by the human head sub-model is determined.

5. The method according to claim 1, characterized in that The method further comprises: Determining a target bounce time corresponding to the engine cover model based on the damage information received by the human head sub-model; Based on the target pop-up time, the parameters of the detonator sub-model are adjusted to obtain adjustment recommendation information for the detonator.

6. The method according to claim 1, characterized in that The first three-dimensional sub-model further includes a sealing strip sub-model; the sealing strip sub-model abuts against the engine cover model and the vehicle body sub-model; The sealing strip sub-model in the impact test finite element model is established by the following steps: Based on the cross-section information of the sealing strip sub-model in the first three-dimensional sub-model, a simplified finite element model corresponding to the cross-section of the sealing strip sub-model is constructed; the simplified finite element model includes a one-dimensional unit with a stiffness curve feature, a first two-dimensional unit representing a contact surface between the sealing strip sub-model and the engine cover model, and a second two-dimensional unit representing a contact surface between the sealing strip sub-model and the vehicle body sub-model; the first two-dimensional unit and the second two-dimensional unit have elastic material properties; the first two-dimensional unit and the second two-dimensional unit move along the axial direction of the one-dimensional unit when subjected to force; Determining a target number of the simplified finite element models based on the length of the sealing strip sub-model and the simulation accuracy of the sealing strip sub-model; The simplified finite element models of a target number are arranged to obtain the sealing strip sub-model in the impact test finite element model.

7. The method according to claim 6, characterized in that The step of determining the target number of the simplified finite element models based on the length of the sealing strip sub-model and the simulation accuracy of the sealing strip sub-model includes: Determining a target spacing between simplified finite element models based on a simulation accuracy for the sealing strip sub-model; Based on the length of the sealing strip sub-model and the target spacing, a target number of the simplified finite element model is determined.

8. The method according to claim 7, characterized in that The stiffness curve characteristics of the one-dimensional element are determined according to the following steps: Performing a compression test on the sealing strip to be tested to obtain stiffness information of the sealing strip to be tested; Based on the stiffness information and the target quantity of the simplified finite element model, a stiffness curve characteristic of a one-dimensional element in the simplified finite element model is determined.

9. A computer device, characterized in that: include: A processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and the processor is used to execute the machine-readable instructions stored in the memory. When the machine-readable instructions are executed by the processor, the processor executes the steps of the impact test method according to any one of claims 1 to 8.

10. A computer program product, wherein when the computer program product is executed by a computer device, the steps of the impact test method according to any one of claims 1 to 8 are executed.

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