基于作动器非线性的主动悬架减振性能研究

Research on the Damping Performance of Active Suspension Based on Actuator Nonlinearity

针对电磁主动悬架中直线作动器非线性特性对车辆减振性能产生影响的问题,采用麦克斯韦应力张量法建立输入电流与输出电磁力的非线性解析模型。通过拟合作动器非线性力的办法将解析模型中多结构参数问题缩减到二维,再将作动器拟合模型应用到采用LQG控制器的1/4车辆悬架模型中,研究作动器非线性对车辆减振性能的影响。结果表明:作动器的非线性使LQG控制效果变差,实际减振性能降低;作动器结构参数中极对数与初级定子长度的比值接近车辆共振频率时,减振性能最差。

Aiming at the problem that the nonlinear characteristics of linear actuators in electromagnetic active suspensions affect the vehicle’s damping performance,the Maxwell stress tensor method was used to establish a nonlinear analytical model of input current and output electromagnetic force.By simulating the nonlinear force of the actuator,the problem of multiple structural parameters in the analytical model was reduced to two dimensions,and then the actuator fitting model was applied to the 1/4 vehicle suspension model by using the LQG controller,the impact of the nonlinearity of the actuator on the vibration damping performance of the vehicle was studied.The results show that the nonlinearity of the actuator makes the LQG control effect worse,and the actual damping performance decreases;when the ratio of the number of pole pairs to the length of the primary stator in the structural parameters of the actuator is close to the vehicle resonance frequency,the vibration damping performance is the worst.