| With the progress of the society and the development of technology, the request of thecomfort performance is more and more high. And the vibration and noise performance havebeen the important standard to measure whether the vehicle is good or not. The mount systemof automobile power has much influence in improving automobile smoothness and decreasenoise. Proper design of automotive powertrain would greatly reduce the vibration ofautomotive powertrain and body.This paper aiming at the vibration problem of a hybrid electric bus under engine idlingcondition, a vibration-attenuation characteristic analysis of the original mounting system iscarried out. According to the test, the hybrid electric bus powertrain parameters were test.Then a six degree of freedom model of the mount system is built up by using ADAMS. Theaccuracy of model is verified by comparing with the test data of idle vibration on powertrainmounting system. And based on the model, the vibration attenuation performance of thepowertrain mounting system was simulated under the idle speed condition both in timedomain and in frequency domain. Vibration characteristics including natural frequencies anddecouple rates are analyzed then. Because of the influence of the whole vehicle arrangement,this paper takes the stiffness parameters of the mount components and the installed angle ofengine front mounting were optimized design variables，takes the energy decoupling of thepowertrain mounting system as the optimizing goal，then the vibration characteristics arecompared by simulation before and after optimization, the feasibility is verified.The study method and the result of study on the powertrain mount system in this paperhad provided guideline for vibration isolation design of vehicle powertrain mounting system. |
