Vibration Analysis And Optimal Design Of Automotive Powertrain Mounting System

As the main source of vibration, the powertrain system has a great impact on ride comfort and NVH characteristics for modern vehicles. A well-designed powertrain mounting system can significantly decrease the vibration transmission and improve ride comfort. In this paper, the vibration isolation characteristics of mounting system are studied based on a front wheel drive powertrain platform.The dynamic equation of powertrain mounting system is derived by applying Lagrange Equation. A simulation model is also built up by using MATLAB and ADAMS separately with the model parameters obtained by experiments.The accuracy of model is verified by comparing with the test data on vehicle. Vibration characteristics including natural frequencies and decouple rates are analyzed then. Aiming to improve system decouple rates, optimum method is used to optimize mount rates with specified boundary conditions. The vibration characteristics are compared by simulation before and after optimization, the feasibility is verified.In addition, a full powertrain-vehicle model is also proposed in this paper, and the simulation results show that it can be used as a virtual machine.The study proves that the vibration isolation effect is improved on comparison by optimization. The methodology is equally applicable to other mounting systems.