Frequency Response Data-based Resonant Filter Design considering Phase Stabilization and Stroke Limitation applied to Dual-Stage Actuator Hard Disk Drives

Abstract

Disturbance rejection of a Hard Disk Drive (HDD) enables a large amount of data storage in a recent information society. The aim is to design a feedback controller which rejects disturbances at multiple frequencies in HDDs. The disturbance rejection is achieved using resonant filters which have a large peak at disturbance frequencies. The developed approach enables the convex optimization of resonant filters with phase stabilization and stroke limitation using frequency response data of a controlled system. The disturbance rejection performance of the optimized resonant filters is validated in a dual-stage actuator HDD benchmark problem.