Fourteen-degree-of-freedom vehicle dynamics model modeling method based on multi-body dynamics

A technology of vehicle dynamics and multi-body dynamics, applied in the field of mechanical engineering, can solve problems such as high complexity, high computational complexity, and unfavorable development and use by researchers, and achieve the effect of strong versatility

Inactive Publication Date: 2021-05-11
JILIN UNIV
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Problems solved by technology

A car is a complex multi-body system, and the running state of the car is the result of the interaction between the vehicle, the driver, and the formal environment; generally speaking, the more degrees of freedom the vehi

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  • Fourteen-degree-of-freedom vehicle dynamics model modeling method based on multi-body dynamics
  • Fourteen-degree-of-freedom vehicle dynamics model modeling method based on multi-body dynamics
  • Fourteen-degree-of-freedom vehicle dynamics model modeling method based on multi-body dynamics

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Embodiment Construction

[0041] In the following, the proposed model building method will be further elaborated and explained in conjunction with the accompanying drawings.

[0042] The vehicle model dynamics block diagram is as follows Figure 1 As shown, the present invention proposes a vehicle model modeling method based on multi-body dynamics considering yaw, roll, and pitch, which is implemented in the following steps:

[0043] S1. The vehicle to be studied is regarded as a multi-rigid body system, including one sprung mass rigid body and four unsprung mass rigid bodies.

[0044] S2. The overall structure of the car is extremely complex. During the driving process of the car, the operating state is jointly affected by the driver's behavior, the state of the vehicle, and the external environment. Therefore, the forces on each part of the vehicle are constantly changing, and there is a coupling relationship between them. In order to simplify the subsequent calculation process, four sets of differe...

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Abstract

The invention discloses a fourteen-degree-of-freedom vehicle dynamics model modeling method based on multi-body dynamics. The method overcomes the problem that the internal function of existing vehicle simulation software is not open in sources. The method comprises the following steps: regarding a to-be-researched vehicle as a multi-rigid-body system which comprises a sprung mass rigid body and four unsprung mass rigid bodies, ignoring frictional resistance and torque of a steering system in the steering process of the vehicle, ignoring air resistance, considering the K and C characteristic of a suspension system, ignoring the friction effect of the suspension system, setting the road condition to be a dry horizontal road surface, ignoring the jumping of wheels relative to a vehicle body caused by road surface pits, solving the tire force by adopting a magic formula, only considering the vertical jumping and rotary motion of the wheels relative to the wheels, and establishing a vehicle model based on the hypotheses. The model comprises translational motion and rotary motion of a vehicle body along x, y and z axes, and vertical bounce and rotary motion of four wheels, and has 14 degrees of freedom in total.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and designs a multi-body dynamics-based fourteen-degree-of-freedom vehicle dynamics model modeling method, which is suitable for common vehicle driving conditions and used by researchers. Background technique [0002] In recent years, my country's automobile industry has developed rapidly, and the production of automobiles has increased year by year. People use automobiles not only as means of transportation, but also as an important tool to improve their quality of life. Therefore, automobile safety, comfort, and handling stability are very important. After entering the new century, major colleges and universities with vehicle-related majors and car companies continue to invest in improving car performance. Because of the high cost of automobiles, real vehicle tests cannot be carried out all the time, so it is very important to conduct simulation experiments through relevant softw...

Claims

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Application Information

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IPC IPC(8): G06F30/15G06F119/14
CPCG06F30/15G06F2119/14Y02T90/00
Inventor 王德军史德伟王丽华
Owner JILIN UNIV
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