Analysis of Filter Designed on the Basis of Short-Span Seeking Control of Hard Disk Drives with Learning-Based PTC

Abstract

A two-degree-of-freedom control is generally used in the short-span seeking mode of hard disk drives (HDDs). Authors' group have proposed a perfect tracking control (PTC) method and a learning-based PTC (LPTC) method, which helps in suppressing overshoot by learning the tracking error in the acceleration and deceleration periods, so that high accuracy and presice speed control are achieved. In this paper, designing of a learning filter, which plays an important role in the suppression of the tracking error, is considered. Finally, simulations and experiments are performed to confirm the effectiveness of the designed filter.