轮毂电机驱动电动汽车将电机、轮毂、减速机构等集成于车轮内，这种高度集成不仅会造成非簧载质量的增加，路面激励引起的轮毂电机气隙不均匀还将导致电磁振动激励的进一步恶化．针对上述问题，基于笔者前期提出的一种新型内置悬置系统的电动轮拓扑结构方案，文中建立了新型电动轮车辆振动模型，推导出了多质量系统车身加速度、车轮相对动载、悬架动挠度及定转子相对位移等车辆平顺性指标对路面不平度速度输入的频响函数，通过车辆平顺性指标对电机质量、定转子质量比、轴承刚度、悬置元件刚度等重要结构参数的灵敏度分析，了解系统参数对各平顺性指标的影响．结果表明: 悬置元件的阻尼对车身振动加速度和悬架动行程影响最大，其灵敏度分别达到10.33 和10.21; 定转子相对位移对轮毂轴承刚度最为敏感，其敏感度达到12.07; 轮胎动载则对电机总质量最为敏感，其敏感度达到10.49; 上述各参数中，电机定转子质量比对各振动响应量的影响均较小．

In an electric vehicle driven by in-wheel motor,the motor,the wheels and the brake are all embeddedin the wheels.This configuration not only increases the unsprung mass but also results in critical vibration of the inwheelmotor system due to the nonuniform motor air-gap caused by road excitation.In order to solve these problems,based on the novel in-wheel motor topology scheme put forward in their early work,the authors set up a novelvehicle vibration model and derive the frequency response functions of the vehicle riding comfort indexes whichfit varied road unevenness,such as the multi-mass system body acceleration,the relative dynamic tyre load,thedynamic suspension deflection and the relative displacement between the rotor center and the stator center.Finally,the sensitivity analyses of some important structural parameters,such as the total mass of in-wheel motor,the massratio of the stator to the rotor,the bearing stiffness,the rubber bushing stiffness,are carried out to reveal the effectsof the parameters on the vehicle riding comfort indexes.The results show that the rubber bushing damping is thegreatest influence factor of the body acceleration and the suspension working space,with the corresponding sensitivitiesbeing up to 10.33 and 10.21,respectively; that the bearing stiffness is the most sensitive factor of the relativedisplacement between the rotor center and the stator center,with the corresponding sensitivity being up to 12.07;that the total mass of in-wheel motor is the most sensitive factor of the dynamic tyre load,with the sensitivity beingup to 10.49; and that,among all the above-mentioned parameters,the stator-to-rotor mass ratio has the slightesteffect on the vibration response indexes.