Optimization And Design Of The Powertrain Mount System Of Electric Vehicle

In the21st century, with the support of national policy, it will become a major trend for new energy vehicles replacing conventional fuel vehicles in the future development of vehicle industry. Moreover, as living standards improved, people consider more about vehicle ride comfort. Therefore, in the process of the development of new energy vehicles, it is essential to research NVH performance. The powertrain, however, has huge impact on the new energy vehicle ride comfort when it works and produces vibration passing to the whole vehicle. Mount system, as an elastic element connecting the powertrain and chassis, can reduce the vibration of transmission effectively, its design needs to be researched. Specific contents of this paper includes the following aspects:(1) Reading the relevant literature, understanding the current situation of powertrain mount system, and analyzing relevant theory of electric vehicle powertrain mount system design.(2) According to the powertrain parameters, this paper utilizes CATIA and ADAMS to establish six degrees virtual prototype model of the electric vehicle powertrain mount system. And analyzes the vibration characteristics of the powertrain mount system when it works at rated speed condition, initial condition, braking condition, and cornering condition. And analyzes its inherent characteristics and energy distribution.(3) Setting three stiffness coefficient of powertrain mount elements as design variables, setting rational allocation of system natural frequency as constraints, setting six degrees of freedom decouple of powertrain mount system as the objective function, this paper optimize the powertrain system. Thus, we raise decoupling rate of the optimized powertrain mount system, improve isolation effect and get the optimized stiffness, that providing a reference for structural design of mount components.(4) This paper design the structure of mount components based on the optimized stiffness and the original mount parameters. Then we utilize finite element analysis to analyze the stiffness curve of the designed mount components, comparing with the optimized stiffness above, verify the correctness of the mount component design.