Analysis and optimization design of six degrees of freedom engine mount system

Abstract

The vibration isolation performance of the engine mount system has a great influence on the NVH characteristics of the vehicle. For the engine mount system, the dynamic model is deduced according to the Lagrangian equation. The optimal allocation of the natural frequency is proposed by researching the trace transfer function of the coupled 6-DOF anti-vibration system and analyzing the natural frequency of engine mount system. The equivalent spring-center algorithm is adopted to reverse solve the system support parameters by combining the optimized frequency configuration and Cholesky mode. The results show that the vibration acceleration of the engine after optimization is smaller than that before optimization and basic decoupling in each direction through the dynamic simulation of the engine mount system, which verifies the feasibility and effectiveness of the engine mount optimization design method based on the inherent characteristics of the six-degree-of-freedom system.