Research on the Robustness of Digital Hydraulic Position Tracking System Based on Sliding Mode Adaptive Control

In the control algorithm of digital hydraulic position tracking system, there exists many modeling assumptions and limited robustness. By the combining of the sliding mode variable structure control and model reference adaptive control, the present essay is to design a new sliding mode adaptive controller and do a simulation analysis. The simulation results indicate that the controller has high precision in controlling and fast in responding. It overcomes the problem of the control precision's decreasing when the adaptive control is applied alone and the output of the system is zero and avoids the influences of the uncertain parameters and the external disturbance, thus the robustness of the system.