某电动汽车动力总成悬置系统优化设计

Optimum Design of Powertrain Mounting System for the Electric Vehicle

定义电机动力总成质心坐标系,并系统地阐述动力总成悬置系统解耦及优化设计的基本理论,在此基础上,针对某电动汽车动力总成悬置系统,运用能量解耦法分析六自由度悬置系统的振动耦合特性,根据悬置系统振动耦合影响因素提出基于扭矩轴理论和遗传算法对悬置位置、悬置刚度进行优化设计的方法,最后在整车上对悬置系统的解耦和隔振性能进行仿真验证。结果表明:优化后的悬置系统在整车上的解耦程度得到了明显提升,车辆的原地起步加速瞬态特性也得到显著改善,从而提高了车辆乘坐的舒适性。

The center of mass system of motor powertrain was established and the basic theory of decoupling and optimization for powertrain mounting system was described systematically.For an electric vehicle powertrain mounting system,firstly the vibration coupling characteristics of the 6-DOF model was analyzed by means of the method of energy decoupling,and then the method was proposed according to decoupling factors that the mount position and stiffness were optimized to improve the decoupling rate based on the TRA theory and the genetic algorithm.Finally the decoupling characteristics and the vibration isolation performance were verified by simulation,and the results show that the optimized mounting system improves significantly the energy decoupling rate of mounting system in the full vehicle model and in the vehicle transient characteristics under the condition of standing start acceleration,and increases the vehicle’s comfort performance.