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

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...

AI Technical Summary

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 vehicle model has, the closer the simulation results are to the real car, but the higher the computational complexity

Therefore, the complexity is too high, which will not be conducive to the development and use of researchers

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