Precise Track-following Control Using Learning Control with Linear Interpolation for Optical Disk Drives

Abstract

The authors are developing a precise track-following control system with a learning controller for optical disk drives. This learning controller automatically estimates and generates an actuator drive signal to effectively compensate for the periodic disturbance. We have already proposed a learning controller with stairs approximation but there is a possibility of generating undesirable vibration in the tracking error due to the stairs output of the learning controller. To solve this problem, we tried to introduce a linear interpolation to make the output of the learning controller smooth.
In this paper, we describe the principle of the learning controller with linear interpolation and how to design its parameters. By simulations and experiments, we demonstrate the performance of the proposed control system.