Differential Search Algorithm Based Design of Fractional Order PID Controller for Hard Disk Drive Read/Write System

Abstract

This paper suggests a novel intelligent closed loop control strategy based on fractional order (FO) PID controller for head positioning servo control system. The design of FOPID controller has been formulated as a single objective optimization framework using time domain optimality criterion and is carried out with help of Differential Search (DS) algorithm. In order to digitally realize FOPID controller, an Oustaloup 5 th order approximation has been used. It is shown that the servo system optimally moves the reader head on to the desired track when actuated with FOPID controller than a normal PID controller. Validation results of DS algorithm tuned FOPID controller are compared with PID controller, which shows the superior closedloop response and robustness of the proposed approach.