Robust Feedfoward Control System considering Sudden Disturbance for Optical Disk Recording System

Abstract

This paper proposes a new robust feedforward tracking servo system for optical disk recording system with considering a sudden disturbance for optical disk recording system. In optical recording systems, the tracking servo system must suppress tracking error below its tolerance. This paper designs the robust feedback control system by using the coprime factorization and disturbance observer. The proposed robust feedback control system suppresses the sudden disturbance caused by walking and running. The detecting signal of optical disk recording system is only a tracking error. Hence, the feedforward controller of the proposed tracking control system is constructed based on both “Zero Phase Error Tracking" (ZPET) control theory and prediction of tracking error. The experimental results point out that the proposed tracking servo system has a quick and precise tracking response and keeps the residual tracking error below its tolerance.