汽车排气系统吊耳动刚度优化方法的研究  

Modeling and optimization method of dynamic stiffness for automotive exhaust system hangers

作　　者：上官文斌[1,2] 黄志[1] 贺良勇[1] 段小成 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510641 [2]宁波拓普声学振动技术有限公司,宁波315806

出　　处：《振动与冲击》2010年第1期100-102,152,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金(50575073)资助项目

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。In order to minimize the dynamic load transmitted from exhaust system hangers to a car body and enhance hangers against fatigue,a vibration analysis model for an exhaust system and a powertrain was established.The natural frequencies and modal-shapes were calculated and compared with those of the experiments under conditions of free-free boundary and constraint boundary,the results validated the proposed model.Through minimizing the dynamic load in vertical direction transmitted from hangers to a car body,and restricting the static displacement of isolators within a certain range,a model for optimizing dynamic stiffness of exhaustive system hangers was established.The vibration responses of the body floor at driver position were measured when the car was running at idle speed and the second gear level.It was seen that the vibration response is reduced greatly at idle speed and in the engine speed of 1000rpm to 3900rpm using the optimized hangers.The results showed the effectiveness of the proposed model and optimization method.The modeling and methods for optimizing hangers of exhaust system presented here are helpful to estimating dynamic stiffness of exhaust system hangers in design stage.

关 键 词：排气系统 吊耳 频率响应分析 动刚度优化 

分 类 号：U262.42[机械工程—车辆工程]