Analysis Of Power Driveline Torsional Vibration And Its Influence On Vehicle Vibration

Mini-bus has been popular among the majority of consumers for a long time with its economical and practical advantages. However, the driveline torsional vibration of mini-bus is quite obvious and has great impact on the vibration and noise of vehicles. In recent years, with the vigorous development of the automobile market and the intense competition between major manufacturers, as well as customers demanding higher requirements on the riding comfort of vehicle, it is of great significance to study on the power driveline torsional vibration and its influence on vehicle vibration.This paper focuses on the power driveline of a mini-bus. The torsional vibration characteristics and their effects on vehicle vibration and noise are studied. Firstly, a3D and ADAMS multi-body dynamic model of the power driveline of vehicle is established. After the free vibration calculation of the rigid-flexible coupling multi-body dynamics model, its inherent characteristics are obtained. The torsional vibration characteristics are summarized by comparing with the shafting equivalent model.Secondly, the target model is tested and analyzed. Torsional vibration, driveline vibration, body vibration and interior noise of the car are tested, as well as the sweep measurement for vibration and noise of the car. The characteristics of the torsional vibration, driveline and body vibration, interior noise of the car and the inherent characteristics of the vehicle vibration and noise are summarized. The accuracy of the ADAMS multi-body dynamic model and the shafting equivalent model are verified. In addition, by analyzing the relationship between torsional vibration and the vibration and noise of the vehicle, it is determined that the two ways of vibration and noise of the car caused by torsional vibration should be the transmission of shaft to the shell of the gear box and the drive axle housing, causing the shell to vibrate, which eventually results in the vibration and noise of the car. At1200rpm, the torsional vibration amplitude is large, which is transmitted to the body through the shell of the gear box and the drive axle housing. The excitation frequency is40Hz, which is consistent with the inherent frequency of the car body, and causes the problem of vibration and noise of the car with resonation. At1500rpm the engine excitation frequency is consistent with the torsional inherent frequency, which causes severe vibration on the shell of the gear box and the drive axle housing with resonation. Both shells transmit the vibration to the body, because the inherent frequency of the body is50Hz, a strong vibration of the car is caused by resonation. Finally, a simple model of shaft and gearbox shell and drive axle housing are established. Through the formula derivation and simulation on the mechanical relationship verification, it is illustrated that the alternating torque on the shaft will cause an alternating torque on the shell, and causes the vibration on the shell, thus verifying the way and clarifying the mechanism of vibration and noise of the car caused by torsional vibration. Meanwhile, according to the basic principles of dynamic equations, the test model and stress of the rear drive axle are analyzed and interpreted. It provides a theoretical basis and direction for further research on vibration transfer law and damping scheme.