本文针对电液伺服加振系统参数摄动的特点,提出了参数摄动不变性的概念和系统摄动范围的新的估计方法及其本质。在理论上给出了参数摄动线性离散系统模型到达变结构控制(DMRVSC)的设计方法及离散动态补偿器的设计准则,并证明了该方法滑模可达条件成立。该方法减小了系统在切换面上的抖动,提高了系统跟踪精度及鲁棒性。 In this paper, according to the characteristics of the perturbation of the parameters of electro-hydraulic servo vibration system, the concept of parameter perturbation invariance and the new estimation method and its essence of system perturbation range are proposed. The design method of DMRVSC (Discrete Variable Structure Control) and the design criterion of discrete dynamic compensator are given theoretically. The reachable condition of sliding mode of this method is proved. The method reduces the jitter of the system on the switching surface and improves the system tracking accuracy and robustness.