ROBUST OPTIMIZATION OF VIBRATION ISOLATION AND RUBBER HANGERS FATIGUE DURABILITY PERFORMANCES OF VEHICLE EXHAUST SYSTEMS
Wu Jie 1,2 , Hu Hao1, Luo Yutao 1,2
1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641;
2. Guangdong Key Laboratory for Automotive Engineering, Guangzhou 510641
Abstract：Due to manufacturing, measurement, mounting and aging, the actual stiffness values of rubber hangers and sylphon bellows will fluctuate around their nominal design values. Accordingly, the static and dynamic performances of an exhaust system will also deviate from their nominal design values. In order to improve the isolation and fatigue durability robustness of vehicle exhaust systems, a robust multi-objective optimization model is proposed to minimize the static deflection and the preload standard deviation of rubber hangers, and extreme values of the vertical dynamic load transmitted to body including their standard deviation. In the optimization model, the dynamic stiffness of rubber hangers and sylphon bellows are taken as normal probabilistic design variables, and the vibration reduction of rubber hangers is constrained to be no smaller than 20dB. The optimization result shows that the static and dynamic performances of the exhaust system are less insensitive to the nominal design of the robust optimization than that of the deterministic one. That is to say, the vibration isolation and fatigue durability performances of the exhaust system are more robust by using the robust optimization design. The presented robust optimization method is of valuable reference for improving the robustness of ride comfort and the fatigue durability of vehicle exhaust systems.
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