Study On Vibration Isolation Performance Of Automotive Engine Mounting System

The engine is the power source of the automobile and the main reason of vehicle vibration. If the vibration can not be controlled and reduced, other parts connected to it will generate strong vibration and noise, which will seriously influence the stability of the automobile, make the passengers feel uncomfortable, and even damage some mechanical parts. And therefore, using the engine mounting system to reduce and control the vibration has become an important process of the automobile innovation. Focused on the 4G64 engine mounting system, this paper analyzes and optimizes its vibration isolation characteristics. The main research is as follows.First, based on the development of the automobile engine mounting system at home and abroad, to make the mounting system realize the support, limitation and vibration isolation function, this paper analyzes and calculates the inherent frequency of 4G64 mounting system, and the range is from 3.5Hz to 16.5Hz.Second, C++ language is used to conduct the data preprocess of 4G64 mounting system. Under the ANSYS environment, equivalent modeling and modal analysis are finished. And within the limited space and rigidity scope, to reduce the energy coupling in the main vibration direction, the best mounting position and rigidity has been calculated.The final part is the simulation result analysis. The result shows the power decoupling in the main vibration direction is above 80%, which means the optimized mounting system has reduced the vibration dramatically. In addition, the whole vibration system is in the proper range of inherent frequency, avoiding the excitation frequency band. This paper proves the effectiveness of the proposed mounting system, meaningful to the design and development of the 4G64 engine mounting system.