Optimization Design and Robustness Analysis of Powertrain Mounting System Based on Vehicle Performance

• 1、Automoble Engineering Department, The State Key Laboratory of Mechanical Transmission,Chongqing,400044

Abstract：The matching optimization of powertrain mounting system and vehicle NVH performance has important research value. For this reason, this paper combines the interior noise and vibration, and carries out a comprehensive optimization design and robust analysis of the 13-degree-of-freedom model of automotive powertrain mount system. Firstly, a 13-degree-of-freedom model of vehicle was established. Through the sensitivity analysis, the objective function which is greatly influenced by the suspension stiffness was identified, and the optimization model of the mount system considering the decoupling rate, vertical vibration of driver seat guideway and the noise of driver\'s right ear was set up. Then, the genetic algorithm was used to optimize the stiffness of the suspension system and obtain a global optimal solution. Monte Carlo method was used to analyze and compare the robustness of the suspension system before and after optimization, according to the comparison, the effectiveness of the optimization results was verified.

Keywords： Stiffness optimization Sensitivity analysis Robustness analysis Monte Carlo method