Vehicle body mounting point rigidity evaluation method and system

Abstract

The invention discloses a vehicle body mounting point rigidity evaluation method and system, and belongs to the technical field of automobiles. Comprising the following steps: acquiring chassis hard point information, whole vehicle parameter information and a rigidity curve; the chassis hard point information, the whole vehicle parameter information and the rigidity curve are processed through multi-body dynamics software, and a whole vehicle dynamics model is generated and subjected to reality; according to the real whole vehicle assembly body and the working condition needing to be simulated, dynamics solution is conducted through multi-body dynamics software, and a bush stress curve of each vehicle body installation point is output; and according to the bushing stress curve and the rigidity curve of each vehicle body mounting point, calculating corresponding deformation and vibration isolation rate so as to evaluate the rigidity of the vehicle body mounting point. The method can be used for evaluating the rigidity of the vehicle body mounting points of various vehicle types, and solves the problem of low universality of the rigidity evaluation of the vehicle body mounting points in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a method and system for evaluating the stiffness of vehicle body mounting points. Background Art

[0002] The statements in this section merely mention background art related to the present invention and do not necessarily constitute prior art.

[0003] As consumers have higher and higher requirements for car handling and comfort, improving handling and comfort has become the main goal in the process of car development and design. During daily driving, vehicles will encounter some typical scenarios, such as double lane changes and speed bumps. In these scenarios, the vehicle's handling stability and smoothness will have a great impact on the driving experience of drivers and passengers.

[0004] Therefore, in the process of automobile development and design, it is necessary to verify whether the vehicle's handling stability and ride comfort meet the design requirements and propose optimization solutions. The stiffness of the body mounting point will have a great impact on these two performances. By evaluating and optimizing the stiffness of the body mounting point, the vehicle performance can be improved.

[0005] Evaluating the stiffness of the body mounting points is a complex process involving theoretical calculations, experimental verification, and multidisciplinary considerations. In the process of automobile development and design, there is a lack of an effective method for evaluating the stiffness of the body mounting points. Summary of the invention

[0006] In order to address the deficiencies in the prior art, the present invention provides a vehicle body mounting point stiffness evaluation method, system, electronic device, computer storage medium and computer program product, which establish a vehicle dynamics model through multi-body dynamics software and simulate and output the bushing force results at the vehicle body mounting points, thereby evaluating the vehicle body mounting point stiffness.

[0007] In a first aspect, the present invention provides a method for evaluating the stiffness of a vehicle body mounting point;

[0008] A method for evaluating the stiffness of a vehicle body mounting point, comprising:

[0009] Obtain chassis hard point information, vehicle parameter information and stiffness curve;

[0010] Processing the chassis hard point information, the vehicle parameter information and the stiffness curve by multi-body dynamics software to generate a vehicle dynamics model and realize it;

[0011] According to the realistic vehicle dynamics model and the working conditions to be simulated, the dynamics solution is performed through multi-body dynamics software to output the bushing force curve of each vehicle body installation point;

[0012] According to the bushing force curve and stiffness curve of each body mounting point, the corresponding deformation and vibration isolation rate are calculated to evaluate the stiffness of the body mounting point.

[0013] In some embodiments, the whole vehicle dynamics model is realized by adjusting the mass parameters, center of mass position and moment of inertia at the center of mass of the whole vehicle dynamics model to actual parameters, and modifying the attribute file of the tire subsystem in the whole vehicle dynamics model to the tire attribute file corresponding to the actual vehicle model.

[0014] In some embodiments, the multi-body dynamics software is Adams Car.

[0015] In some embodiments, according to the bushing force curve and stiffness curve of each body mounting point, the corresponding deformation is calculated by calculating the ratio of the peak or valley value of the bushing force curve to the stiffness of the body mounting point to generate the corresponding deformation.

[0016] In some implementations, the corresponding vibration isolation rate is calculated based on the bushing force curve and stiffness curve of each vehicle body mounting point by calculating the ratio of the vehicle body mounting point stiffness to the bushing stiffness to determine the corresponding vibration isolation rate.

[0017] In some embodiments, if the deformation exceeds a preset deformation threshold or the vibration isolation rate is less than a preset vibration isolation rate threshold, the stiffness of the vehicle body mounting point is unqualified.

[0018] In a second aspect, the present invention provides a vehicle body mounting point stiffness evaluation system;

[0019] A vehicle body mounting point stiffness evaluation system, comprising:

[0020] The acquisition module is configured to: acquire chassis hard point information, vehicle parameter information and stiffness curve;

[0021] The vehicle assembly generation module is configured to: process the chassis hard point information, the vehicle parameter information and the stiffness curve through multi-body dynamics software to generate a vehicle dynamics model and perform realization;

[0022] The simulation module is configured to: perform dynamics solution through multi-body dynamics software according to the realistic vehicle dynamics model and the working conditions to be simulated, and output the bushing force curve of each vehicle body installation point;

[0023] The body mounting point stiffness evaluation module is configured to calculate the corresponding deformation and vibration isolation rate according to the bushing force curve and stiffness curve of each body mounting point to evaluate the body mounting point stiffness.

[0024] In a third aspect, the present invention provides an electronic device;

[0025] An electronic device comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above-mentioned vehicle body mounting point stiffness evaluation method.

[0026] In a fourth aspect, the present invention provides a computer-readable storage medium;

[0027] A computer-readable storage medium stores a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned vehicle body mounting point stiffness evaluation method.

[0028] In a fifth aspect, the present invention provides a computer program product;

[0029] A computer program product comprises a computer program / instruction, which implements the steps of the above-mentioned vehicle body mounting point stiffness evaluation method when executed by a processor.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The technical solution provided by the present invention establishes an evaluation system for the stiffness of the body mounting point. By applying force to the bushing at the body mounting point, the displacement of the point under force is obtained, thereby evaluating the stiffness of the body mounting point. The method has strong versatility and can be used to evaluate the stiffness of the body mounting points of various vehicle models.

[0032] 2. The technical solution provided by the present invention can quickly determine the position of the vehicle body mounting point with inappropriate stiffness based on the deformation and vibration isolation rate of the vehicle body mounting point, thereby improving the driving performance quality of the chassis.

[0033] 3. The technical solution provided by the present invention can be used to evaluate and modify the stiffness of the vehicle body mounting points to improve the performance of vehicles with poor handling stability or ride comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 A schematic flow chart of a vehicle body mounting point stiffness evaluation method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0037] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0039] Embodiment 1

[0040] The data processing flow of the existing vehicle body mounting point stiffness evaluation method is cumbersome and its versatility needs to be improved. Therefore, this embodiment provides a vehicle body mounting point stiffness evaluation method, which evaluates the vehicle body mounting point stiffness according to the bushing force curve of each vehicle body mounting point, the vehicle body mounting point stiffness and the bushing stiffness, thereby improving the evaluation efficiency.

[0041] Next, combine Figure 1 , a vehicle body mounting point stiffness evaluation method disclosed in this embodiment is described in detail. The vehicle body mounting point stiffness evaluation method comprises the following steps:

[0042] S1. Obtain chassis hard point information, vehicle parameter information and stiffness curve.

[0043] In this embodiment, the chassis hard point information includes the hard points of each control arm of the front and rear suspension, the hard points of the front and rear subframes, the upper and lower points of the front and rear shock absorbers, the upper and lower points of the front and rear springs, the wheel center points, the hard points of the front and rear stabilizer bar bodies, the upper and lower points of the front and rear stabilizer bar links, the hard points of the steering system and the H-point coordinates of the seat under the design state; the vehicle parameter information includes the mass, center of mass and moment of inertia at the center of mass, etc., and the stiffness curve includes the bushing stiffness curve, spring stiffness, buffer block stiffness curve and shock absorber stiffness curve, etc.

[0044] The seat hard point information under design status is provided by the chassis design department, and the stiffness information is generally provided by the supplier.

[0045] S2. The chassis hard point information, vehicle parameter information and stiffness curve are processed by multi-body dynamics software to generate a vehicle dynamics model and make it realistic.

[0046] In this embodiment, the multi-body dynamics software used is Adams Car.

[0047] Exemplarily, S2 specifically includes:

[0048] S201, input chassis hard point information, vehicle parameter information and stiffness curve into multi-body dynamics software, establish each hard point of the front and rear suspension system template; then, establish control arms, springs, shock absorbers and other components based on the hard points. When establishing the front and rear subframes, flexible bodies are required to improve simulation accuracy.

[0049] Similarly, according to the above steps, the templates of the steering system, powertrain system, front and rear stabilizer bar system are established. Finally, the template of the body subsystem is established, and the hard points are established according to the hard point coordinates of the design status provided by the chassis department, and then the passenger, luggage and other components are established. At the same time, the mass adjustment component is established to adjust the vehicle mass, center of mass, and moment of inertia at the center of mass later.

[0050] S202. Establish constraint relationships between components in the suspension system template.

[0051] Specifically, the inner point of the control arm is connected to the subframe / body with a bushing, the upper point of the shock absorber and the upper point of the spring are connected to the body with a bushing, each point of the front and rear subframes is connected to the body with a bushing, the outer point of the control arm is connected to the steering knuckle with a ball head pair and a bushing, and a cylindrical pair is established in the shock absorber to realize the real tension and compression movement of the shock absorber.

[0052] Similarly, establish the connection relationship between the steering system, powertrain system, front and rear stabilizer bar system and body system components.

[0053] S203, generate corresponding subsystems according to the established templates of suspension system, steering system, powertrain system, front and rear stabilizer bar system, and body system. The front and rear tire system and brake system use the subsystems provided by the multi-body dynamics software. Finally, use the above subsystems to generate the whole vehicle assembly, that is, the whole vehicle dynamics model.

[0054] S204, adjusting the mass parameters, center of mass position and moment of inertia at the center of mass of the whole vehicle dynamics model to actual parameters, and modifying the attribute file of the tire subsystem in the whole vehicle dynamics model to the tire attribute file corresponding to the actual vehicle model.

[0055] S3. Based on the realized vehicle assembly and the working conditions to be simulated, dynamics solution is performed through multi-body dynamics software to output the bushing force curve of each vehicle body installation point.

[0056] In this embodiment, the working conditions to be simulated include double lane change, steady-state rotation, step steering, speed bumps, and large impact roads, etc. According to the working conditions to be simulated, dynamics solution is performed in the multi-body dynamics software to output the bushing X, Y, and Z force curves at each body mounting point. The body mounting points include the front and rear subframes and body connection points, the suspension control arms and body connection points (depending on the actual suspension structure), the front and rear springs and body connection points, and the front and rear shock absorbers and body connection points.

[0057] In summary, the specific contents of S2-S3 are all executed by the existing multi-body dynamics software Adams Car, which is well known to those skilled in the art and will not be repeated here.

[0058] S4. According to the bushing force curve and stiffness curve of each body mounting point, the corresponding deformation and vibration isolation rate are calculated to evaluate the stiffness of the body mounting point.

[0059] Specifically, the ratio of the peak or valley value of the bushing force curve to the stiffness of the body mounting point is calculated to generate the corresponding deformation; if the deformation exceeds the preset deformation threshold, it proves that the stiffness of the body mounting point is inappropriate. Different working conditions correspond to different deformation thresholds at the body mounting point, which are determined by the designer.

[0060] The ratio of the body mounting point stiffness to the bushing stiffness is calculated to determine the corresponding vibration isolation rate. If the vibration isolation rate is less than the preset vibration isolation rate threshold, the body mounting point stiffness is inappropriate.

[0061] Here, the body mounting point stiffness is tested by the testing department.

[0062] Embodiment 2

[0063] This embodiment discloses a vehicle body mounting point stiffness evaluation system, including:

[0064] The acquisition module is configured to: acquire chassis hard point information, vehicle parameter information and stiffness curve;

[0065] The vehicle assembly generation module is configured to: process the chassis hard point information, the vehicle parameter information and the stiffness curve through multi-body dynamics software to generate a vehicle dynamics model and perform realization;

[0066] The simulation module is configured to: perform dynamics solution through multi-body dynamics software according to the realistic vehicle dynamics model and the working conditions to be simulated, and output the bushing force curve of each vehicle body installation point;

[0067] The body mounting point stiffness evaluation module is configured to calculate the corresponding deformation and vibration isolation rate according to the bushing force curve and stiffness curve of each body mounting point to evaluate the body mounting point stiffness.

[0068] It should be noted that the acquisition module, vehicle assembly generation module, simulation module and vehicle body mounting point stiffness evaluation module correspond to the steps in Embodiment 1, and the examples and application scenarios implemented by the modules and the corresponding steps are the same, but are not limited to the contents disclosed in Embodiment 1. It should be noted that the modules as part of the system can be executed in a computer system such as a set of computer executable instructions.

[0069] Embodiment 3

[0070] Embodiment 3 of the present invention provides an electronic device, including a memory and a processor, and computer instructions stored in the memory and executed on the processor. When the computer instructions are executed by the processor, the steps of the above-mentioned vehicle body mounting point stiffness evaluation method are completed.

[0071] Embodiment 4

[0072] Embodiment 4 of the present invention provides a computer-readable storage medium for storing computer instructions. When the computer instructions are executed by a processor, the steps of the above-mentioned vehicle body mounting point stiffness evaluation method are completed.

[0073] Embodiment 5

[0074] Embodiment 5 of the present invention provides a computer program product, including a computer program / instruction, which implements the steps of the above-mentioned vehicle body mounting point stiffness evaluation method when executed by a processor.

[0075] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0076] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0077] These computer program instructions can also be loaded onto a computer or other programmable data processing device, and a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0078] The description of each embodiment in the above embodiments has different emphases. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for evaluating the stiffness of a vehicle body mounting point, characterized in that: include: Obtain chassis hard point information, vehicle parameter information and stiffness curve; Processing the chassis hard point information, the whole vehicle parameter information and the stiffness curve by multi-body dynamics software to generate a whole vehicle dynamics model and realize it; According to the realistic vehicle dynamics model and the working conditions to be simulated, the multi-body dynamics software is used to perform dynamics solution and output the bushing force curve of each vehicle body installation point; According to the bushing force curve and stiffness curve of each body mounting point, the corresponding deformation and vibration isolation rate are calculated to evaluate the stiffness of the body mounting point.

2. The vehicle body mounting point stiffness evaluation method according to claim 1, characterized in that: The specific steps of making the vehicle dynamics model realistic are: adjusting the mass parameters, center of mass position and moment of inertia at the center of mass of the vehicle dynamics model to actual parameters, and modifying the attribute file of the tire subsystem in the vehicle dynamics model to the tire attribute file corresponding to the actual vehicle model.

3. The vehicle body mounting point stiffness evaluation method according to claim 1, characterized in that: The multi-body dynamics software is Adams Car.

4. The vehicle body mounting point stiffness evaluation method according to claim 1, characterized in that: According to the bushing force curve and stiffness curve of each body mounting point, the corresponding deformation is calculated specifically as follows: the ratio of the peak value or valley value of the bushing force curve to the stiffness of the body mounting point is calculated to generate the corresponding deformation.

5. The vehicle body mounting point stiffness evaluation method according to claim 1, characterized in that: According to the bushing force curve and stiffness curve of each body mounting point, the corresponding vibration isolation rate is calculated specifically as follows: the ratio of the body mounting point stiffness to the bushing stiffness is calculated to determine the corresponding vibration isolation rate.

6. The vehicle body mounting point stiffness evaluation method according to claim 1, characterized in that: If the deformation exceeds the preset deformation threshold or the vibration isolation rate is less than the preset vibration isolation rate threshold, the stiffness of the vehicle body mounting point is unqualified.

7. A vehicle body mounting point stiffness evaluation system, characterized in that: include: The acquisition module is configured to: acquire chassis hard point information, vehicle parameter information and stiffness curve; The vehicle assembly generation module is configured to: process the chassis hard point information, the vehicle parameter information and the stiffness curve through multi-body dynamics software to generate a vehicle dynamics model and perform realization; The simulation module is configured to: perform dynamics solution through multi-body dynamics software according to the realistic vehicle dynamics model and the working conditions to be simulated, and output the bushing force curve of each vehicle body installation point; The body mounting point stiffness evaluation module is configured to calculate the corresponding deformation and vibration isolation rate according to the bushing force curve and stiffness curve of each body mounting point to evaluate the body mounting point stiffness.

8. An electronic device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the vehicle body mounting point stiffness evaluation method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the vehicle body mounting point stiffness evaluation method according to any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the vehicle body mounting point stiffness evaluation method according to any one of claims 1 to 6 are implemented.

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