汽车传动系扭振数学模型的建立及验证

Establishment and Verification of a Vehicle Driveline Torsional Vibration Mathematical Model

针对某MPV车型传动系扭振过大的问题,建立包含万向节不等速特性及后桥齿轮啮合刚度的传动系扭振模型.进行自由振动与受迫振动计算,分析共振的可能性并找出共振频率,并通过传动系扭振试验,验证理论模型的正确性.根据理论分析设计相应扭转减振器以提升整车NVH性能,并通过整车试验,验证所设计的扭转减振器的有效性.研究成果为解决传动系扭振问题提供了理论依据,对于提升后驱车传动系NVH性能具有一定的参考价值,有利于加快新车传动系的开发过程.

Aiming at the problem that a MPV driveline has a great torsional vibration,a torsional vibration model of the driveline is established considering the non-constant velocity characteristic of the universal joint and the meshing stiffness of the rear axle gear. The freevibrationand forced vibration is calculated to analysis the possibility of the resonance and find the resonant frequency,and the correctness of the theoretical model is verified by the driveline torsional vibration test. According to the theoretical analysis,the torsion vibration damper is designed to improve the vehicle NVH performance,and the effectiveness of the designed torsional vibration damper is verified by the vehicle test. The research results provide a theoretical basis for solving the torsional vibration problem of the driveline,which has a certain reference value for improving the NVH performance of the rear-drive vehicle drivelineandhelps to speed up the development process of the new Vehicle Driveline.