Application of gain-scheduled H _∞ control in electrohydraulic force servo system with time-varying flexible load

In this paper gain-scheduled H _∞ controller is designed for electrohydraulic force servo system with time-varying flexible load. Here the system state-space matrices are assumed to depend affinely on the vector of time-varying parameters, and assuming real-time measurement of these parameters, they can be fed to the controller. Then the problem, which is to design single controller in linear large parameter-varying systems, reduces to solving a system of linear matrix inequalities (LMIs). The methodology presented in this paper is applied to Hydraulic Automatic Cyclic Triaxial Equipment with Earthquake Wave Input (Cyclic Triaxial). The simulation results show the validity on improving the performance of Cyclic Triaxial with large parameter-varying load.