Control System Development of the One-axis Hydraulic Road Simulator Using QFT

This paper presents the one-axis hydraulic road simulator control technology for reproducing the random input signal to implement the real road data. The simulator consists of the hydraulic pump, servo valve, hydraulic actuator and its control equipments. The force control system using QFT is utilized to control the simulator effectively and illustrates a tracking performance of the closed-loop controller with low order transfer function Gi(s) and pre-filter F(s) for a parametric uncertain plant. A force controller is designed to communicate the control signal between simulator and digital controller. Tracking specification is satisfied with upper and lower bound tolerances on the steep response of the system to the reference signal. The efficacy of the QFT force controller is verified through the numerical simulation, in which combined dynamics and actuation of the hydraulic servo system are tested. The simulation results show that the proposed control technique works well under uncertain hydraulic plant system. The Labview software is used to make up for the real controller in the real-time basis, and the experimental works show that the proposed algorithm works well for the one-axis hydraulic road simulator.