电液位置伺服系统干扰抑制问题的H_∞控制

H_∞ Control of Disturbance Attenuation Problem for Electro Hydraulic Position Servo System

运用 H∞ 控制理论 ,建立了电液位置控制系统 H∞ 控制模型和电液位置伺服系统的抗干扰问题的最优指标 ,定义了功能评价指标 ,论述了加权矩阵的确定方法 ,并对该模型求解 ,设计出电液位置控制系统干扰抑制问题的 H∞ 控制器。仿真表明 ,运用该控制器可抑制干扰信号 ,消除系统中参数变化及不确定因素的影响 ,当负载发生变化时 ,系统具有很强的鲁棒性 ,表明了 H∞ 控制器的有效性。

In the paper, a H ∞ control model of electro hydraulic position servo system was deduced based on the H ∞ control theory. An optimum control objective of the disturbance attenuation problem for electro hydraulic was obtained and a function evaluation standard was defined. The determining method of the weighted matrix was discussed and the solution of the model was given. A H ∞ controller of disturbance attenuation problem was designed so as to suppress the disturbance signal, improve the precision, stability, and dynamic characteristic of the system. The simulations showed that H ∞ controller could suppress disturbance signal, eliminate the influences produced by uncertainty parameters and factors, the system was robustness when the load changed, and the controller proposed was effective.