某电动汽车动力总成悬置设计与特性研究

Design and characterization of powertrain mounts for an electric vehicle

以某企业电机和压缩机为研究对象,建立电动汽车动力总成动力学模型,分别用ADAMS建模和MATLAB编程2种方式分析系统模态;针对电机模态分析中解耦率存在耦合振动问题,利用MATLAB联合Isight软件对解耦率进行优化分析;对优化后的悬置系统进行非线性刚度设计,基于通用汽车28工况,利用多体动力学分析28工况中的典型和极限2个工况,得到动力总成质心转角和位移、悬置弹性中心点位移、悬置所受载荷;利用有限元分析软件对悬置支架进行静、动态分析,校核悬置非线性刚度设计和支架设计合理性。

Taking the electric motor and compressor of an enterprise as the research object,the powertrain dynamics model of electric vehicle was established,and the system modes were analyzed by ADAMS modelling and MATLAB programming respectively;for the coupling vibration problem of decoupling rate in the modal analysis of the electric motor,the decoupling rate was optimized and analyzed by using MATLAB in conjunction with Isight software;nonlinear stiffness design of the optimized mounting system was carried out.Based on the 28 working conditions of GM vehicles,the classical and extreme working conditions in the 28 working conditions were analyzed by multibody dynamics,and the displacement and angle of the centre of mass of the powertrain,the displacement of the elastic centre of the mount,and the load on the mount were obtained;and the static and dynamic analyses of the mount bracket were carried out by using the finite element analysis software,and the nonlinear stiffness design of the mount and the reasonableness of the design of the bracket were calibrated.