动力总成悬置系统隔振率的计算方法  

Calculating method for the isolation rate of mounts in a powertrain mounting system

作　　者：罗国海 上官文斌[1] 秦武 李利平[1] 叶必军 Subhash Rakheja LUO Guohai;SHANGGUAN Wenbin;QIN Wu;LI Liping;YE Bijun(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China;Ningbo Tuopu Group Co.,Ltd.,Ningbo 315800,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广州510641 [2]宁波拓普集团股份有限公司,宁波315800

出　　处：《振动与冲击》2019年第14期202-209,259,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51275175)

摘　　要：基于动力总成为刚体的假设,根据A车型悬上、悬下点的加速度的实测值,建立了动力总成激励力的识别方法。由动力总成激励力计算结果,和悬下点IPI数据,给出了悬上、悬下点加速度和悬置的隔振率的计算方法。B车型的动力总成与A车型相同,但悬置系统与车身不同。由建立的模型计算了B车型悬置系统悬上点加速度,与实测值进行了对比分析,证明了动力总成激励力识别模型的有效性。利用识别的动力总成激励力,和测试得到的B车型悬下点的IPI参数,计算得到了B车型各个悬置的隔振率,与实测结果的对比分析证明了该研究建立的悬置隔振率计算方法的有效性。该研究识别得到的动力总成的激励力,可以用于评价动力总成振动。根据动力总成的激励力和悬下点的IPI参数,计算得到的悬置的隔振率,为悬置系统的优化设计提供了分析方法。Models and methods for calculating the isolation rate of mounts in a powertrain mounting system (PMS) were discussed.For verification,two cars,car A and car B were taken as tested objects.For car A,a model for identifying the excitation forces of its powertrain was proposed with the assumption of taking the powertrain as a rigid body,based on the measured accelerations at the upper and under mounting points where the mount was connected with the powertrain and car body respectively.Then,a method for estimating the isolation rate of the mount in the PMS was developed by using the identified excitation forces and the input point inertance at the under comnection point.The powertrain installed in car B is the same as that of car A,but the body,mount locations and stiffness of car B are different from that of car A.For car B,the accelerations at the upper connection point were calculated,and compared with the experimental results,which validates the model for powertrain excitation force identification.Also,by comparing the estimated and measured isolation rates of the mount of car B validates the calculation methods for mount isolation rates developed in the paper.The identified excitation forces can be used for evaluating the vibrations of powertrain,and the calculated isolation rate can be used for optimizing powertrain mounting system designs.

关 键 词：动力总成 激励力识别 悬置 隔振率计算 

分 类 号：U462.3[机械工程—车辆工程]