Construction method, device and equipment of simplified mathematical model of automobile front structure

Abstract

The invention relates to the technical field of automobile collision safety, in particular to a method, device and equipment for constructing a simplified mathematical model of an automobile front structure, and the method comprises the steps: dividing a plurality of mass blocks and a plurality of spring damping units based on the automobile front structure, and constructing a mass-spring model according to the mass blocks and the spring damping units, on the basis of a mass-spring model, a collision dynamic equation of the automobile front structure is constructed according to the relation between displacement and distance of the mass blocks and the spring damping units, the collision mechanical characteristics of the automobile front structure are accurately represented, and meanwhile rigidity values of multiple parts of the automobile front structure can be obtained or verified through the collision dynamic equation. Therefore, when structural analysis is carried out in the front collision working condition of the automobile, a simplified mathematical model can be adopted to carry out modeling on the front structure of the automobile, a complete part model and detailed material parameters are not needed, and the method can be used for analyzing the influence of rigidity changes of different parts of the front part of the automobile on the overall performance of the automobile; and conceptual analysis can also be carried out.

Description

Technical Field

[0001] The present application relates to the technical field of automobile collision safety, and in particular to a method, device and equipment for constructing a simplified mathematical model of a front structure of an automobile. Background Art

[0002] As an important test device in the collision test, automobile collision honeycomb aluminum can simulate the other vehicle that collides with the test vehicle, represents the level of vehicle collision stiffness, reflects the characteristics of the other vehicle in the collision test, and is the main scale and measuring tool for collision strength. The development of frontal collision honeycomb aluminum requires accurate extraction of the stiffness of the typical structure of the front of the car. The front cabin of the car usually has structural parts such as the front longitudinal beam, subframe, and important parts assembly such as the engine and gearbox. It is one of the most densely packed and complex areas of the car.

[0003] The front structure of a car, as the main stress-bearing area in a collision, poses a huge challenge to modeling due to its complexity and diversity. The front cabin integrates many key components such as the front longitudinal beam, subframe, engine, and gearbox. The interaction and mechanical properties between these components have a significant impact on the collision results. Therefore, how to quickly and accurately model the front structure of a car to evaluate its performance in a collision has become a technical problem that needs to be solved urgently.

[0004] However, although some simplified modeling methods have been proposed, they are often unable to fully reflect the complexity and nonlinear characteristics of the front structure of the vehicle. In addition, these methods also have certain limitations in extracting the typical structural stiffness of the front of the vehicle, making it difficult to meet the needs of high-precision analysis. Summary of the invention

[0005] The present application provides a method, device and equipment for constructing a simplified mathematical model of the front structure of an automobile, so as to solve the problems that the existing simplified modeling methods are difficult to fully reflect the complexity and nonlinear characteristics of the front structure of an automobile, and also have certain limitations in extracting the typical structural stiffness of the front of the automobile, and are difficult to meet the needs of high-precision analysis.

[0006] The first aspect of the present application provides a method for constructing a simplified mathematical model of a front structure of an automobile, comprising the following steps: dividing the front structure of the automobile into a plurality of mass blocks and a plurality of spring damping units, and constructing a mass-spring model according to the plurality of mass blocks and the plurality of spring damping units; based on the mass-spring model, constructing a collision dynamic equation of the front structure of the automobile according to the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units, accurately characterizing the collision mechanical characteristics of the front structure of the automobile, and at the same time, the stiffness values ​​of a plurality of components of the front structure of the automobile can be obtained or verified through the collision dynamic equation.

[0007] Optionally, after constructing a mass-spring model according to the multiple mass blocks and the multiple spring damping units, it also includes: constructing a collision simulation model of the front structure of the automobile based on the mass-spring model, and calculating the cross-sectional force-displacement curves of multiple components of the front structure of the automobile based on the collision simulation model; performing linear fitting on the cross-sectional force-displacement curves of the multiple components to obtain the stiffness values ​​of the multiple components.

[0008] Optionally, the collision dynamic equation of the front structure of the automobile is constructed based on the mass-spring model and according to the relationship between the displacement and distance of the multiple mass blocks and the multiple spring damping units, including: if the difference between the displacement of a first mass block and the displacement of a second mass block among the multiple mass blocks is less than a first preset distance, and the displacement of the second mass block is less than a second preset distance, then the collision dynamic equation is:

[0009]

[0010] Wherein, M1 is the mass of the first mass block, M2 is the mass of the second mass block, M3 is the mass of the third mass block, K1 is the stiffness of the lower curved longitudinal beam, K2 is the stiffness of the front longitudinal beam, K7 is the stiffness of the support near the engine, K8 is the stiffness of the transmission system, S1 is the displacement of the first mass block, S3 is the displacement of the second mass block, S5 is the speed of the third mass block, is the acceleration of the first mass block, is the acceleration of the second mass block, is the acceleration of the third mass block.

[0011] Optionally, the constructing the collision dynamic equation of the front structure of the automobile according to the mass-spring model and based on the relationship between the displacement and distance of the multiple mass blocks and the multiple spring damping units further includes: if the difference between the displacement of the first mass block and the displacement of the second mass block is greater than the first preset distance, and the displacement of the second mass block is less than the second preset distance, then the collision dynamic equation is:

[0012]

[0013] Among them, K5 is the stiffness of the firewall, and D1 is the distance between the firewall and the engine.

[0014] Optionally, the constructing the collision dynamic equation of the front structure of the automobile according to the mass-spring model and based on the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units further includes: if the displacement of the second mass block is greater than the second preset distance, the collision dynamic equation is:

[0015]

[0016] Among them, K3 is the stiffness of the upper beam, K4 is the stiffness of the subframe, and K6 is the stiffness of the water tank and radiator.

[0017] The second aspect of the present application provides a device for constructing a simplified mathematical model of a front structure of an automobile, including: a construction module, used to divide the front structure of the automobile into multiple mass blocks and multiple spring damping units, and construct a mass-spring model based on the multiple mass blocks and the multiple spring damping units; a calculation module, used to construct a collision dynamic equation of the front structure of the automobile based on the mass-spring model and according to the relationship between the displacement and distance of the multiple mass blocks and the multiple spring damping units, accurately characterize the collision mechanical characteristics of the front structure of the automobile, and at the same time, the stiffness values ​​of multiple components of the front structure of the automobile can be obtained or verified through the collision dynamic equation.

[0018] Optionally, after constructing a mass-spring model according to the multiple mass blocks and the multiple spring damping units, the construction module is further used to: construct a collision simulation model of the front structure of the automobile based on the mass-spring model, and calculate the cross-sectional force-displacement curves of multiple components of the front structure of the automobile based on the collision simulation model; and perform linear fitting on the cross-sectional force-displacement curves of the multiple components to obtain the stiffness values ​​of the multiple components.

[0019] Optionally, the calculation module is further configured to: if the difference between the displacement of a first mass block and the displacement of a second mass block among the multiple mass blocks is less than a first preset distance, and the displacement of the second mass block is less than a second preset distance, then the collision dynamic equation is:

[0020]

[0021] Wherein, M1 is the mass of the first mass block, M2 is the mass of the second mass block, M3 is the mass of the third mass block, K1 is the stiffness of the lower curved longitudinal beam, K2 is the stiffness of the front longitudinal beam, K7 is the stiffness of the support near the engine, K8 is the stiffness of the transmission system, S1 is the displacement of the first mass block, S3 is the displacement of the second mass block, S5 is the speed of the third mass block, is the acceleration of the first mass block, is the acceleration of the second mass block, is the acceleration of the third mass block.

[0022] Optionally, the calculation module is further configured to: if the difference between the displacement of the first mass block and the displacement of the second mass block is greater than the first preset distance, and the displacement of the second mass block is less than the second preset distance, then the collision dynamic equation is:

[0023]

[0024] Among them, K5 is the stiffness of the firewall, and D1 is the distance between the firewall and the engine.

[0025] Optionally, the calculation module is further configured to: if the displacement of the second mass block is greater than the second preset distance, then the collision dynamic equation is:

[0026]

[0027] Among them, K3 is the stiffness of the upper beam, K4 is the stiffness of the subframe, and K6 is the stiffness of the water tank and radiator.

[0028] A third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a method for constructing a simplified mathematical model of a front structure of a vehicle as described in the above embodiment.

[0029] A fourth aspect of the present application provides a computer program product having a computer program stored thereon, which is executed by a processor to implement a method for constructing a simplified mathematical model of a front structure of a vehicle as described in the above embodiment.

[0030] In the above implementation, a plurality of mass blocks and a plurality of spring damping units are divided based on the front structure of the automobile, and a mass-spring model is constructed based on the plurality of mass blocks and the plurality of spring damping units. Based on the mass-spring model, a collision dynamic equation of the front structure of the automobile is constructed according to the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units, and the collision mechanical characteristics of the front structure of the automobile are accurately characterized. At the same time, the stiffness values ​​of the plurality of components of the front structure of the automobile can be obtained or verified through the collision dynamic equation. Thus, the existing simplified modeling method is difficult to fully reflect the complexity and nonlinear characteristics of the front structure of the automobile, and there are certain limitations in extracting the stiffness of the typical structure of the front of the automobile, and it is difficult to meet the needs of high-precision analysis. When performing structural analysis in the frontal collision condition of the automobile, a simplified mathematical model can be used to model the front structure of the automobile, without the need for a complete component model and detailed material parameters, and can be used to analyze the influence of the stiffness changes of different components of the front of the automobile on the overall performance of the vehicle, and can also be used for conceptual analysis.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0033] Figure 1 A flowchart of a method for constructing a simplified mathematical model of a front structure of an automobile provided according to an embodiment of the present application;

[0034] Figure 2 A schematic diagram of the mass-spring correspondence relationship under a vehicle collision condition according to an embodiment of the present application;

[0035] Figure 3 is a schematic diagram of a mass-spring model of a front structure of an automobile according to an embodiment of the present application;

[0036] Figure 4 This is a schematic diagram of the force on the mass block M1 according to the first embodiment of the present application;

[0037] Figure 5 This is a schematic diagram of the force on the mass block M2 according to the first embodiment of the present application;

[0038] Figure 6 This is a schematic diagram of the force on the mass block M3 according to the first embodiment of the present application;

[0039] Figure 7 is a schematic diagram of the force applied to the mass block M1 according to the second embodiment of the present application;

[0040] Figure 8 is a schematic diagram of the force applied to the mass block M2 according to the second embodiment of the present application;

[0041] Fig. 9 is a schematic diagram of the force applied to the mass block M3 according to the second embodiment of the present application;

[0042] Fig.10 is a schematic diagram of the force applied to the mass block M1 according to the third embodiment of the present application;

[0043] Fig.11 is a schematic diagram of the force applied to the mass block M2 according to the third embodiment of the present application;

[0044] Fig.12 is a schematic diagram of the force applied to the mass block M3 according to the third embodiment of the present application;

[0045] Fig.13 A schematic diagram of implementation steps of a simplified modeling method according to an embodiment of the present application;

[0046] Fig.14 A schematic diagram of the force position of the front structure section of a vehicle according to an embodiment of the present application;

[0047] Fig.15 A schematic diagram of a vehicle simulation collision process according to an embodiment of the present application;

[0048] Fig.16 is a schematic diagram of an energy change curve according to an embodiment of the present application;

[0049] Fig.17 It is a schematic diagram of the front longitudinal beam stiffness fitting according to one embodiment of the present application;

[0050] Fig.18 A schematic diagram of the stiffness fitting of the upper side beam according to an embodiment of the present application;

[0051] Fig.19 It is a schematic diagram of the subframe stiffness fitting according to one embodiment of the present application;

[0052] Fig. 20 A schematic diagram of the stiffness fitting of the upper side beam according to an embodiment of the present application;

[0053] Fig.21 is a schematic diagram of a MATLAB mathematical model according to an embodiment of the present application;

[0054] Fig. 22 is a schematic diagram of a displacement-time curve according to an embodiment of the present application;

[0055] Fig.23 is a schematic diagram of a speed-time curve according to an embodiment of the present application;

[0056] Fig.24 is a schematic diagram of an acceleration-time curve according to an embodiment of the present application;

[0057] Fig.25 A schematic diagram of collision force curve comparison according to an embodiment of the present application;

[0058] Fig.26 An exemplary diagram of a device for constructing a simplified mathematical model of a front structure of an automobile according to an embodiment of the present application;

[0059] Fig. 27 Schematic diagram of the structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0060] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0061] The following describes the construction method, device and equipment of the simplified mathematical model of the front structure of the automobile of the embodiment of the present application with reference to the accompanying drawings. In view of the problem that the existing simplified modeling method mentioned in the above background technology is difficult to fully reflect the complexity and nonlinear characteristics of the front structure of the automobile, and there are certain limitations in extracting the stiffness of the typical structure of the front of the automobile, and it is difficult to meet the needs of high-precision analysis, the present application provides a construction method of a simplified mathematical model of the front structure of the automobile, in which a plurality of mass blocks and a plurality of spring damping units are divided based on the front structure of the automobile, and a mass-spring model is constructed based on the plurality of mass blocks and the plurality of spring damping units, and based on the mass-spring model, a collision dynamic equation of the front structure of the automobile is constructed according to the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units, so as to accurately characterize the collision mechanical characteristics of the front structure of the automobile, and at the same time, the stiffness values ​​of the plurality of components of the front structure of the automobile can be obtained or verified through the collision dynamic equation. As a result, the problems that the existing simplified modeling methods are difficult to fully reflect the complexity and nonlinear characteristics of the front structure of the automobile, and there are certain limitations in extracting the typical structural stiffness of the front of the automobile, and it is difficult to meet the needs of high-precision analysis. When performing structural analysis in the frontal collision condition of the automobile, a simplified mathematical model can be used to model the front structure of the automobile. There is no need for a complete component model and detailed material parameters. It can be used to analyze the impact of changes in the stiffness of different components at the front of the automobile on the overall performance of the vehicle, and conceptual analysis can also be performed.

[0062] Specifically, Figure 1 A schematic flow chart of a method for constructing a simplified mathematical model of a front structure of an automobile provided in an embodiment of the present application.

[0063] like Figure 1 As shown, the method for constructing the simplified mathematical model of the front structure of the automobile comprises the following steps:

[0064] In step S101 , a plurality of mass blocks and a plurality of spring damping units are divided based on the front structure of the automobile, and a mass-spring model is constructed according to the plurality of mass blocks and the plurality of spring damping units.

[0065] In step S102, based on the mass-spring model, a collision dynamic equation of the front structure of the vehicle is constructed according to the relationship between the displacement and distance of multiple mass blocks and multiple spring damping units to accurately characterize the collision mechanical characteristics of the front structure of the vehicle. At the same time, the stiffness values ​​of multiple components of the front structure of the vehicle can be obtained or verified through the collision dynamic equation.

[0066] Among them, the multiple mass blocks include a first mass block, a second mass block, and a third mass block. The first mass block is the mass block corresponding to the simplified vehicle body, the second mass block is the mass block corresponding to the simplified engine, and the third mass block is the mass block corresponding to the simplified wheel. The spring damping unit includes a lower curved longitudinal beam, a front longitudinal beam, an upper side beam, and the like.

[0067] The schematic diagram of the front structure model of the car under the whole vehicle collision condition is as follows Figure 2 As shown, the simplified mass-spring model is shown in Figure 3 As shown,

[0068] M1 is the mass of the corresponding mass block after the vehicle body is simplified, M2 is the mass of the corresponding mass block after the engine is simplified, and M3 is the mass of the corresponding mass block after the wheel is simplified.

[0069] K1 is the stiffness of the lower curved longitudinal beam, K2 is the stiffness of the front longitudinal beam, K3 is the stiffness of the upper side beam, K4 is the stiffness of the subframe, K5 is the stiffness of the firewall, K6 is the stiffness of the water tank and radiator, K7 is the stiffness of the support near the engine, and K8 is the stiffness of the transmission system.

[0070] D1 is the distance between the firewall and the engine (ie, the first preset distance), and D2 is the distance between the radiator and the front end of the vehicle (ie, the second preset distance).

[0071] X1 is the displacement of the first mass block after the vehicle body is simplified, X2 is the displacement of the second mass block after the engine is simplified, and X3 is the displacement of the third mass block after the wheel is simplified.

[0072] Optionally, in some embodiments, based on the mass-spring model, and according to the relationship between the displacement and distance of multiple mass blocks and multiple spring damping units, a collision dynamic equation of the front structure of the automobile is constructed, including: if the difference between the displacement of a first mass block and the displacement of a second mass block among the multiple mass blocks is less than a first preset distance, and the displacement of the second mass block is less than a second preset distance, then the collision dynamic equation is:

[0073]

[0074] Among them, M1 is the mass of the first mass block, M2 is the mass of the second mass block, M3 is the mass of the third mass block, K1 is the stiffness of the lower curved longitudinal beam, K2 is the stiffness of the front longitudinal beam, K7 is the stiffness of the support near the engine, K8 is the stiffness of the transmission system, S1 is the displacement of the first mass block, S3 is the displacement of the second mass block, S5 is the speed of the third mass block, is the acceleration of the first mass block, is the acceleration of the second mass, is the acceleration of the third mass.

[0075] Optionally, in some embodiments, according to the mass-spring model, and based on the displacement and distance relationships of multiple mass blocks and multiple spring-damping units, a collision dynamic equation of the vehicle front structure is constructed, further including: if the difference between the displacement of the first mass block and the displacement of the second mass block is greater than a first preset distance, and the displacement of the second mass block is less than a second preset distance, then the collision dynamic equation is:

[0076]

[0077] where K5 is the firewall stiffness and D1 is the distance between the firewall and the engine.

[0078] Optionally, in some embodiments, according to the mass-spring model, and based on the displacement and distance relationships of multiple mass blocks and multiple spring-damping units, a collision dynamic equation of the vehicle front structure is constructed, further including: if the displacement of the second mass block is greater than the second preset distance, then the collision dynamic equation is:

[0079]

[0080] where K3 is the stiffness of the upper side member, K4 is the subframe stiffness, and K6 is the stiffness of the water tank and radiator.

[0081] Specifically, the mass-spring system model in the embodiments of the present application uses some mass blocks that can represent concentrated masses in the vehicle and a certain number of components to describe the front collision structure of the vehicle. This model structure is relatively simple and has high accuracy.

[0082] Further, according to the mass-spring model and different relationships between the displacement and distance of the mass blocks, different force conditions of the front structure are used to establish a collision dynamic equation of the vehicle front structure. The calculation process is as follows:

[0083] (1) When the difference between the displacement of the vehicle body and the displacement of the engine is less than the first preset distance, and the displacement of the engine is less than the second preset distance, that is, x1 - x2 < D1 and x2 < D2, at this time, the force diagram of the vehicle body (i.e., the first mass block) is as Figure 4 shown,

[0084] then

[0085] that is

[0086] The force diagram of the engine (i.e., the second mass block) is as Figure 5 shown,

[0087] then

[0088] that is

[0089] The force diagram of the tire (the third mass block) is as shown in Figure 6 the figure below.

[0090] Then

[0091] That is

[0092] Furthermore, establish the collision dynamic equation:

[0093] Let S1 = x1, S3 = x2, S5 = x3, where S2 is the velocity of the first mass block, S4 is the velocity of the second mass block, S6 is the velocity of the third mass block. At this time, the collision dynamic equation is:

[0094]

[0095] (2) If the difference between the displacement of the vehicle body and the displacement of the engine is greater than the first preset distance, and the displacement of the engine is less than the second preset distance, that is, x1 - x2 > D1 and x2 < D2, the force diagram of the vehicle body is as shown in Figure 7 the figure below:

[0096] Then

[0097] That is

[0098] The force diagram of the engine is as shown in Figure 8 the figure below.

[0099] Then

[0100] That is

[0101] The force diagram of the tire is as shown in Fig. 9 the figure below.

[0102] Then

[0103] That is

[0104] Furthermore, establish the collision dynamic equation:

[0105] Let S1 = x1, S3 = x2, S5 = x3, The obtained collision dynamic equation is:

[0106]

[0107] (3) When the displacement of the vehicle body is greater than the second preset distance, that is, x2>D2, the force diagram of the vehicle body is as follows: Fig.10 As shown,

[0108] Right now

[0109] Engine Fig.11 As shown,

[0110] but

[0111] Right now

[0112] Tire force diagram Fig.12 As shown:

[0113] but

[0114] Right now

[0115] Further, the collision dynamic equation is established:

[0116] Let S1 = x1, S3=x2, S5=x3, The collision dynamic equation is obtained:

[0117]

[0118] Optionally, in some embodiments, after constructing a mass-spring model based on multiple mass blocks and multiple spring damping units, it also includes: constructing a collision simulation model of the front structure of the automobile based on the mass-spring model, and calculating the cross-sectional force-displacement curves of multiple components of the front structure of the automobile based on the collision simulation model; performing linear fitting on the cross-sectional force-displacement curves of the multiple components to obtain the stiffness values ​​of the multiple components.

[0119] Specifically, Fig.13 As shown in the figure, a typical vehicle is selected as the basis for selecting the stiffness of the components of the mass-spring model. The stiffness of each component can be transformed based on the weight of each component structure. A collision simulation model of the front structure of the car is established in HYPERMESH and submitted to LS-DYNA for calculation. After the simulation calculation is completed, the cross-sectional force-displacement curves of the front longitudinal beam, upper side beam and other components are output and analyzed. The cross-sectional position of the front structure of the car is selected as follows Fig.14 shown.

[0120] Vehicle frontal collision process Fig.15As shown, after the calculation is completed, the frontal collision performance of the vehicle is obtained, and the frontal collision energy change curve of the vehicle is as follows Fig.16 As shown in the figure, the stiffness values ​​of various components in the front structure of the car are calculated by MATLAB software.

[0121] In MATLAB, the force-displacement curves of the cross-sections of the front longitudinal beam, upper side beam and other components are fitted linearly to obtain the basic stiffness of each component, such as Figures 17 to 20 As shown in the figure, the slope of the red fitting straight line is the stiffness of the corresponding structure.

[0122] According to the above analysis, the basic stiffness and mass parameters of each component are selected as follows: K1=4.65*104N / m, K2=25.34*104N / m, K3=4.32*104N / m, K4=11.13*104N / m, K5=4.1*104N / m, K6=4.05*104N / m, K7=4.08*104N / m, K8=3.1*104N / m, M1=783KG, M2=234KG, M3=51.6KG, D1=130mm, D2=280mm.

[0123] In MATLAB, the S function is used to model the front structure collision dynamic equation of the vehicle in the technical solution, such as Fig.21 As shown, input the above parameters to obtain the displacement, velocity, and acceleration curves of the front structure simulation as follows Figures 22 to 24 As shown, in MATLAB, the resultant impact force on the barrier is calculated:

[0124] The resultant force F = F2 + F3 + F4 + F6,

[0125] Finally, according to the simplified model equation, F = K2*x(3)+K6*(x(2)-D2)+(K3+K4)*(x(1)-D2), the output curve is as follows Fig.25 As shown, through Fig.25 By comparing the mathematical model curve with the experimental curve, it can be seen that the trends of the mathematical model curve and the experimental curve are consistent, and the order of magnitude of the collision force is basically the same, which proves that the simplified mathematical model is effective and has good simulation and reliability.

[0126] According to the method for constructing a simplified mathematical model of the front structure of an automobile proposed in the embodiment of the present application, a plurality of mass blocks and a plurality of spring damping units are divided based on the front structure of the automobile, and a mass-spring model is constructed based on the plurality of mass blocks and the plurality of spring damping units. Based on the mass-spring model, a collision dynamic equation of the front structure of the automobile is constructed according to the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units, and the collision mechanical characteristics of the front structure of the automobile are accurately characterized. At the same time, the stiffness values ​​of the plurality of components of the front structure of the automobile can be obtained or verified through the collision dynamic equation. Thus, the existing simplified modeling method is difficult to fully reflect the complexity and nonlinear characteristics of the front structure of the automobile, and there are certain limitations in extracting the stiffness of the typical structure of the front of the automobile, and it is difficult to meet the needs of high-precision analysis. When performing structural analysis in the frontal collision condition of the automobile, a simplified mathematical model can be used to model the front structure of the automobile, without the need for a complete component model and detailed material parameters, and can be used to analyze the influence of the stiffness changes of different components of the front of the automobile on the overall performance of the vehicle, and can also be used for conceptual analysis.

[0127] Next, a device for constructing a simplified mathematical model of the front structure of an automobile proposed in an embodiment of the present application will be described with reference to the accompanying drawings.

[0128] Fig.26 It is a block diagram of a device for constructing a simplified mathematical model of a front structure of an automobile according to an embodiment of the present application.

[0129] like Fig.26 As shown, the device 10 for constructing the simplified mathematical model of the front structure of the vehicle includes: a construction module 100 and a calculation module 200 .

[0130] Among them, the construction module 100 is used to divide a plurality of mass blocks and a plurality of spring damping units based on the front structure of the automobile, and to construct a mass-spring model according to the plurality of mass blocks and the plurality of spring damping units; the calculation module 200 is used to construct a collision dynamic equation of the front structure of the automobile based on the mass-spring model according to the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units, so as to accurately characterize the collision mechanical characteristics of the front structure of the automobile, and at the same time, the stiffness values ​​of the plurality of components of the front structure of the automobile can be obtained or verified through the collision dynamic equation.

[0131] Optionally, in some embodiments, after constructing a mass-spring model based on multiple mass blocks and multiple spring damping units, the construction module 100 is also used to: construct a collision simulation model of the front structure of the automobile based on the mass-spring model, and calculate the cross-sectional force-displacement curves of multiple components of the front structure of the automobile based on the collision simulation model; perform linear fitting on the cross-sectional force-displacement curves of the multiple components to obtain the stiffness values ​​of the multiple components.

[0132] Optionally, in some embodiments, the calculation module 200 is further configured to: if the difference between the displacement of the first mass block and the displacement of the second mass block among the multiple mass blocks is less than the first preset distance, and the displacement of the second mass block is less than the second preset distance, then the collision dynamic equation is:

[0133]

[0134] Among them, M1 is the mass of the first mass block, M2 is the mass of the second mass block, M3 is the mass of the third mass block, K1 is the stiffness of the lower curved longitudinal beam, K2 is the stiffness of the front longitudinal beam, K7 is the stiffness of the support near the engine, K8 is the stiffness of the transmission system, S1 is the displacement of the first mass block, S3 is the displacement of the second mass block, S5 is the speed of the third mass block, is the acceleration of the first mass block, is the acceleration of the second mass, is the acceleration of the third mass.

[0135] Optionally, in some embodiments, the calculation module 200 is further configured to: if the difference between the displacement of the first mass block and the displacement of the second mass block is greater than a first preset distance, and the displacement of the second mass block is less than a second preset distance, then the collision dynamic equation is:

[0136]

[0137]

[0138] Among them, K5 is the stiffness of the firewall, and D1 is the distance between the firewall and the engine.

[0139] Optionally, in some embodiments, the calculation module 200 is further configured to: if the displacement of the second mass block is greater than the second preset distance, the collision dynamic equation is:

[0140]

[0141] Among them, K3 is the stiffness of the upper beam, K4 is the stiffness of the subframe, and K6 is the stiffness of the water tank and radiator.

[0142] It should be noted that the above explanation of the embodiment of the method for constructing a simplified mathematical model of the front structure of an automobile is also applicable to the device for constructing a simplified mathematical model of the front structure of an automobile of this embodiment, and will not be repeated here.

[0143] According to the simplified mathematical model construction device of the front structure of the automobile proposed in the embodiment of the present application, a plurality of mass blocks and a plurality of spring damping units are divided based on the front structure of the automobile, and a mass-spring model is constructed based on the plurality of mass blocks and the plurality of spring damping units. Based on the mass-spring model, the collision dynamic equation of the front structure of the automobile is constructed according to the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units, and the collision mechanical characteristics of the front structure of the automobile are accurately characterized. At the same time, the stiffness values ​​of the plurality of components of the front structure of the automobile can be obtained or verified through the collision dynamic equation. Thus, the existing simplified modeling method is difficult to fully reflect the complexity and nonlinear characteristics of the front structure of the automobile, and there are certain limitations in extracting the stiffness of the typical structure of the front of the automobile, and it is difficult to meet the needs of high-precision analysis. When performing structural analysis in the frontal collision condition of the automobile, a simplified mathematical model can be used to model the front structure of the automobile, without the need for a complete component model and detailed material parameters, and can be used to analyze the influence of the stiffness changes of different components of the front of the automobile on the overall performance of the vehicle, and can also be used for conceptual analysis.

[0144] Fig. 27 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0145] A memory 2701 , a processor 2702 , and a computer program stored in the memory 2701 and executable on the processor 2702 .

[0146] When the processor 2702 executes the program, the method for constructing the simplified mathematical model of the front structure of the automobile provided in the above embodiment is implemented.

[0147] Furthermore, the electronic device further comprises:

[0148] The communication interface 2703 is used for communication between the memory 2701 and the processor 2702 .

[0149] The memory 2701 is used to store computer programs that can be executed on the processor 2702 .

[0150] The memory 2701 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0151] If the memory 2701, the processor 2702 and the communication interface 2703 are implemented independently, the communication interface 2703, the memory 2701 and the processor 2702 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig. 27 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0152] Optionally, in a specific implementation, if the memory 2701, the processor 2702 and the communication interface 2703 are integrated on a chip, the memory 2701, the processor 2702 and the communication interface 2703 can communicate with each other through an internal interface.

[0153] The processor 2702 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0154] The embodiment of the present application also provides a computer program product having a computer program stored thereon, which, when executed by a processor, implements the method for constructing a simplified mathematical model of the front structure of a vehicle as described above.

[0155] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0156] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0157] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0158] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer program product for use with an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, a "computer program product" can be any device that can contain, store, communicate, propagate or transmit a program for use with an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer program products (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). Furthermore, the computer program product may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example by optically scanning the paper or other medium and then editing, interpreting or, if necessary, processing in another suitable manner, and then storing it in a computer memory.

[0159] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0160] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer program product, which, when executed, includes one or a combination of the steps of the method embodiment.

[0161] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer program product.

[0162] The computer program product mentioned above may be a read-only memory, a disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for constructing a simplified mathematical model of a front structure of an automobile, characterized in that: The following steps are involved: Dividing a plurality of mass blocks and a plurality of spring damping units based on the front structure of the automobile, and constructing a mass-spring model according to the plurality of mass blocks and the plurality of spring damping units; Based on the mass-spring model, a collision dynamic equation of the front structure of the automobile is constructed according to the relationship between the displacement and distance of the multiple mass blocks and the multiple spring damping units, so as to accurately characterize the collision mechanical characteristics of the front structure of the automobile. At the same time, the stiffness values ​​of multiple components of the front structure of the automobile can be obtained or verified through the collision dynamic equation.

2. The method according to claim 1, characterized in that After constructing a mass-spring model according to the plurality of mass blocks and the plurality of spring damping units, the method further comprises: Based on the mass-spring model, a collision simulation model of the front structure of the automobile is constructed, and based on the collision simulation model, cross-sectional force-displacement curves of multiple components of the front structure of the automobile are calculated; The cross-sectional force-displacement curves of the multiple components are linearly fitted to obtain the stiffness values ​​of the multiple components.

3. The method according to claim 1, characterized in that The collision dynamic equation of the front structure of the vehicle is constructed based on the mass-spring model and according to the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units, including: If the difference between the displacement of the first mass block and the displacement of the second mass block among the plurality of mass blocks is less than the first preset distance, and the displacement of the second mass block is less than the second preset distance, the collision dynamic equation is: Wherein, M1 is the mass of the first mass block, M2 is the mass of the second mass block, M3 is the mass of the third mass block, K1 is the stiffness of the lower curved longitudinal beam, K2 is the stiffness of the front longitudinal beam, K7 is the stiffness of the support near the engine, K8 is the stiffness of the transmission system, S1 is the displacement of the first mass block, S3 is the displacement of the second mass block, S5 is the speed of the third mass block, is the acceleration of the first mass block, is the acceleration of the second mass block, is the acceleration of the third mass block.

4. The method according to claim 3, characterized in that The method of constructing the collision dynamic equation of the front structure of the automobile according to the mass-spring model and based on the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units also includes: If the difference between the displacement of the first mass block and the displacement of the second mass block is greater than the first preset distance, and the displacement of the second mass block is less than the second preset distance, the collision dynamic equation is: Among them, K5 is the stiffness of the firewall, and D1 is the distance between the firewall and the engine.

5. The method according to claim 4, characterized in that The method of constructing the collision dynamic equation of the front structure of the automobile according to the mass-spring model and based on the relationship between the displacement and distance of the plurality of mass blocks and the plurality of spring damping units also includes: If the displacement of the second mass block is greater than the second preset distance, the collision dynamic equation is: Among them, K3 is the stiffness of the upper beam, K4 is the stiffness of the subframe, and K6 is the stiffness of the water tank and radiator.

6. A device for constructing a simplified mathematical model of a front structure of an automobile, characterized in that: include: A construction module, used for dividing a plurality of mass blocks and a plurality of spring damping units based on the front structure of the automobile, and constructing a mass-spring model according to the plurality of mass blocks and the plurality of spring damping units; The calculation module is used to construct a collision dynamic equation of the front structure of the automobile based on the mass-spring model and the relationship between the displacement and distance of the multiple mass blocks and the multiple spring damping units, accurately characterize the collision mechanical characteristics of the front structure of the automobile, and at the same time, obtain or verify the stiffness values ​​of multiple components of the front structure of the automobile through the collision dynamic equation.

7. The device according to claim 6, characterized in that After constructing the mass-spring model according to the plurality of mass blocks and the plurality of spring damping units, the construction module is further used to: Constructing a collision simulation model of the front structure of the automobile based on the mass-spring model, and calculating cross-sectional force-displacement curves of multiple components of the front structure of the automobile based on the collision simulation model; The cross-sectional force-displacement curves of the multiple components are linearly fitted to obtain the stiffness values ​​of the multiple components.

8. The device according to claim 6, characterized in that The computing module is further used for: If the difference between the displacement of the first mass block and the displacement of the second mass block among the plurality of mass blocks is less than the first preset distance, and the displacement of the second mass block is less than the second preset distance, the collision dynamic equation is: Wherein, M1 is the mass of the first mass block, M2 is the mass of the second mass block, M3 is the mass of the third mass block, K1 is the stiffness of the lower curved longitudinal beam, K2 is the stiffness of the front longitudinal beam, K7 is the stiffness of the support near the engine, K8 is the stiffness of the transmission system, S1 is the displacement of the first mass block, S3 is the displacement of the second mass block, S5 is the speed of the third mass block, is the acceleration of the first mass block, is the acceleration of the second mass block, is the acceleration of the third mass block.

9. The device according to claim 8, characterized in that The computing module is further used for: If the difference between the displacement of the first mass block and the displacement of the second mass block is greater than the first preset distance, and the displacement of the second mass block is less than the second preset distance, the collision dynamic equation is: Among them, K5 is the stiffness of the firewall, and D1 is the distance between the firewall and the engine.

10. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for constructing a simplified mathematical model of a front structure of an automobile as claimed in any one of claims 1 to 5.

Images