车辆半车悬架振动系统的参数辨识

Parameter Identification of Vibration System of Semi-vehicle Suspension

在各类控制系统中广泛存在着时滞现象,尤其在振动控制系统中。本文以含有时滞状态反馈控制的四自由度半车悬架模型为例,在已知系统输入和输出数据的前提下,选取汽车车身质心位移响应作为输出,运用最小二乘法对系统的前后悬架时滞和位移增益参数进行辨识,以真实值和估计值之差的均方根值最小作为目标函数,从而验证该算法的有效性或可行性。

Time-delay exists widely in all kinds of control systems,especially in vibration control systems.In this paper,a four degree of freedom half vehicle suspension model with time-delay state feedback control is taken as an example.On the premise of knowing the input and output data of the system,the displacement response of the vehicle body mass center is selected as the output,and the time-delay and displacement gain parameters of the front and rear suspension are identified by the least square method.The minimum root mean square value of the difference between the real value and the estimated value is taken as the objective function,thus,the validity or feasibility of the algorithm is verified.