汽车排气系统振动和吊耳疲劳性能的稳健优化

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (23) : 222-227.

论文

吴杰 1,2 ，胡浩 1，罗玉涛 1,2

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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

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文章历史 +

摘要

由于加工、测量、安装、老化等原因，排气系统吊耳和波纹管的真实刚度通常在其名义设计值附近波动，使得排气系统真实的静、动态性能与其名义设计值之间存在偏差。为提升汽车排气系统振动及橡胶吊耳疲劳耐久性能的稳健性，以吊耳和波纹管动刚度为正态随机设计变量，以吊耳隔振量不小于20dB为约束条件,以挂钩垂向动态反力最大值及其标准差、吊耳的静变形量及预载力标准差为目标函数，建立了某乘用车排气系统振动和吊耳疲劳性能的多目标稳健优化模型。结果表明，与确定性优化方案相比，排气系统静、动态性能对稳健优化方案的灵敏度降低，实施稳健优化方案将使得排气系统的振动和吊耳疲劳性能更加稳健。文中稳健优化方法对改善排气系统振动和吊耳疲劳耐久性的稳健性有较重要参考价值。

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.

导出引用

吴杰 1,2,胡浩 1，罗玉涛 1,2. 汽车排气系统振动和吊耳疲劳性能的稳健优化[J]. 振动与冲击, 2016, 35(23): 222-227

Wu Jie 1,2,Hu Hao1, Luo Yutao 1,2. ROBUST OPTIMIZATION OF VIBRATION ISOLATION AND RUBBER HANGERS FATIGUE DURABILITY PERFORMANCES OF VEHICLE EXHAUST SYSTEMS[J]. Journal of Vibration and Shock, 2016, 35(23): 222-227

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