汽车排气系统振动和吊耳疲劳性能的稳健优化

发布时间：2018-03-10 15:35

本文选题：排气系统　切入点：振动控制　出处：《振动与冲击》2016年23期 　论文类型：期刊论文

【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20 dB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。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优化有较重要参考价值。
[Abstract]:Due to processing, measurement, installation, aging and other reasons, the true stiffness of the exhaust system hooks and bellows usually fluctuates near its nominal design value, making the exhaust system real static, There is a deviation between the dynamic performance and the nominal design value. In order to enhance the robustness of the vibration of automobile exhaust system and the fatigue durability of rubber hoist, the dynamic stiffness of the hoist and bellows is taken as the normal random design variable. The vibration isolation of the hoist is not less than 20 dB, the maximum value and standard deviation of the vertical dynamic reaction force are taken as the objective function, and the static deformation and the standard deviation of the preload force of the hoist are taken as the objective function. A multi-objective robust optimization model for vibration and hoisting fatigue of a passenger vehicle exhaust system is established. The results show that the static and dynamic performance of the exhaust system is less sensitive to the robust optimization scheme than the deterministic optimization scheme. The implementation of robust optimization scheme will make the vibration and suspension fatigue performance of exhaust system more robust. Robust optimization method has important reference value for improving the robust optimization of exhaust system vibration and suspension fatigue durability.
【作者单位】：华南理工大学机械与汽车工程学院;广东省汽车工程重点实验室;
【基金】：国家863计划项目(2012AA110702) 教育部新世纪人才计划项目(NCET-11-0157)
【分类号】：U464.134.4

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