汽车排气系统吊耳动刚度优化方法的研究

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (1) : 100-102,.

论文

汽车排气系统吊耳动刚度优化方法的研究

上官文斌1，2;黄志1;贺良勇1;段小成2

作者信息 +

A study on optimization methods of dynamic stiffness for automotive exhaust system hangers

SHANGGUAN Wen-Bin1,2;HUANG Zhi1;HE Liang-yong1;DUAN Xiao-cheng2

Author information +

文章历史 +

摘要

基于汽车排气系统吊耳传递的动态载荷最小、吊耳耐疲劳性最好，建立了考虑动力总成在内的排气系统振动分析模型。进行了排气系统的自由模态和约束模态的测试，并和计算值进行了对比分析，证明了所建立的排气系统振动模型的正确性。以吊耳的垂向动态载荷最小和其静变形量在一定范围内为优化目标，建立了排气系统吊耳动刚度优化模型。优化后，在怠速工况和2档全负荷加速工况下对车身底板驾驶员位置进行了振动响应测试，测试结果表明，利用优化后的吊耳刚度，能够有效降低车身底板的振动加速度，表明了本文阐述的排气系统建模和吊耳动刚度优化方法的有效性。文中建模与优化方法，对排气系统的吊耳动刚度计算与优化具有指导意义。

Abstract

For minimizing the dynamic load transmitted from exhaust system hangers to a car body and enhancing the fatigue of hangers, a vibration analysis model for an exhaust system and a powertrain is established. The natural frequencies and mode shapes are calculated and compared well with the experiments for free-free boundary and constraint boundary, which validate the calculation model. By minimizing the dynamic load transmitted from hangers to a car body, and restricting the static displacement of isolators within a range, a method for optimization of dynamic stiffness for exhaustive system hangers is established. The vibration responses of the body floor at driver position are measured when the car is running in idle and second gear (wide opened throttle). It is seen that the vibration response is reduced greatly at idle and in the engine speed of 1000rpm to 3900rpm using the optimized hangers, which validates the proposed model and optimization method. The modeling and methods for optimization hangers of exhaust system presented in this paper are effective for estimating the dynamic stiffness of exhaust system hangers in the design stage.

导出引用

上官文斌;黄志;贺良勇;段小成. 汽车排气系统吊耳动刚度优化方法的研究[J]. 振动与冲击, 2010, 29(1): 100-102,

SHANGGUAN Wen-Bin;HUANG Zhi;HE Liang-yong;DUAN Xiao-cheng. A study on optimization methods of dynamic stiffness for automotive exhaust system hangers[J]. Journal of Vibration and Shock, 2010, 29(1): 100-102,

中图分类号： U262.42