Design of Robust Controller in Electrohydraulic Load Simulator

Application of mu theory in the electrohydraulic load simulator is studied. Robust control strategy of the electrohydraulic load simulator is put forward. The electrohydraulic load simulator is a complicated mechanical-electronic-hydraulic compound system, moreover it is a strong coupling and time-varying controlled object. Synthetically considering uncertainties such as parameter perturbations, model perturbations and external disturbances etc., robust force controller of the electrohydraulic load simulator is designed using mu synthesis theory. Robust stability and robust performance are analyzed by mu values of the system in which robust force controller is used. Moreover, experiment results of systems using robust force controller and classical force controllers are shown. The results indicate that the designed robust force controller is efficiency and superiority

1. Introduction

Electrohydraulic load simulator is a semi-physical simulation device on the ground. Its function is simulating the aerodynamic load spectrums that is applied to the rudder when aerobat is flying with the laboratory conditions, and consequently test the technical characteristics data of the rudder^[1]. It uses semi-physical forecasting experiments with laboratory conditions to replace the classical self-destroyed whole physical experiments to shorten the development cycle, to save development fund and to increase the reliability and mission success rate^[1].