Study Of Vibration Isolation Of Mounting System For Vehicle Powerplant Based On Multi-Body Dynamics

Automobile power-plant causes the engine vibration which often makes passenger uncomfortable. Proper design of powerplant mounting system can improve the riding comfort as well as extend the age of the engine and other components by remarkably suppressing the vibration. Based on Multi-Body Dynamic theory and vibration theory, this thesis applies software ADAMS/View & ADAMS/Vibration, Unigraphics to build the rigid dynamic model according to the mass parameters and geometry position parameters of each component in real model. Based on the model, the vibration isolation performance of the mounting system was simulated in the three typical conditions both in time domain and in frequency domain. And the performance curves were get. The data of before improved and of after improved of real Automobile was used to validate the method of building model and perform simulation tell in this paper. In order to gain the best vibration isolating characteristic of suspension system, parameter model of mount system is established, the stiffness of mount is chosen to be design variable and the least magnitude of the response force in the supported area of mounting system is chose to be target of mount design, besides, the optimization simulation is made and the performance of vibration isolation of the optimized mounting system is improved. The magnitude comparison of angle-vibration of power-plant and the magnitude comparison of vertical-vibration of the marker in the joint between power-plant and chassis is used to validate that the notable effect of he magnitude reduction the response force in the supported area of mounting system to improve vibration isolation of mounting system。...