某混动SUV排气系统向车身的振动传递研究  

Vibration Transmission of a Hybrid SUV Exhaust System

作　　者：弓剑 夏洪兵[2] 徐元利[1] 刘伟[2] 赵鹏[1,2] GONG Jian;XIA Hongbing;XU Yuanli;LIU Wei;ZHAO Peng(College of Mechanical Engineering,Tianjin University of Science & Technology,Tianjin 300222,China;Automotive Engineering Research Institute,China Automotive Technology & Research Center,Tianjin 300300,China)

机构地区：[1]天津科技大学机械工程学院,天津300222 [2]中国汽车技术研究中心汽车工程研究院,天津300300

出　　处：《天津科技大学学报》2019年第2期60-64,共5页Journal of Tianjin University of Science & Technology

基　　金：天津市科技特派员资助项目(16JCTPJC48700);天津大学内燃机燃烧学国家重点实验室开放基金资助项目(k2013-6)

摘　　要：通过动态特性试验,分析了某插电式混合动力SUV排气系统模态以及被动侧吊钩的动刚度.建立该排气系统有限元模型,对其自由模态进行仿真计算并与试验模态对比,最大误差小于5%,模型可靠.为减小排气系统向车身的振动传递,提高整车NVH性能,引入平均驱动自由度位移法进行吊钩位置优化.对优化后的吊钩进行主动侧模态分析并与目标值350 Hz对标;对优化后的排气系统进行约束模态及频率响应分析,其固有频率、峰值频率均避开了发动机常用转速激励频率范围93～107 Hz,证明优化方案可行,可用于工程实践.Through some dynamic characteristics tests, the modalities of a plug-in hybrid SUV exhaust system and the dynamic stiffness of the hook were studied. The finite element model of the exhaust system was build, and the free mode was simulated and then compared with the experimental mode. The maximum error is less than 5% and the model is reliable. In order to reduce the vibration between the exhaust system and the vehicle body and improve the NVH performance of the whole vehicle, an average driving degree of freedom displacement method is introduced to optimize the position of the Hanger. The active side modal of the optimized hangers was analyzed and benchmarked with the target value of 350 Hz. At the same time, the constrained mode and frequency response analysis of the optimized exhaust system were done. The results show that both the natural frequency and the peak frequency can avoid the common engine speed excitation frequency range of 93~107 Hz, which proved that the optimization program is feasible and can be used for engineering practice.

关 键 词：排气系统 吊钩位置优化 动刚度分析 模态分析 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]