Analysis of Bandwidth Expansion and Interference Suppression of Digital Hydraulic Cylinder System

This paper concentrates on digital hydraulic cylinder systems’ interference suppression and bandwidth expansion problems. The goals are to ensure the system’s stability and improve the rapid response-ability. First, a non-linear dynamics is used instead of linearization to formulate the plan. Then, considering the serious measurement noise of the load acceleration signal and the mismatching uncertainties of the electro-hydraulic servo system in practical applications, a new integral robust control strategy is proposed. Further, through the frequency-domain method, the selection laws of the feedback gains are determined. Finally, the control performance of the system is verified by simulation. The results show that the proposed controller can effectively control uncertainties and improve high-frequency tracking performance.