Frequency Separation based Adaptive Feedforward Control for Rejecting Wideband Vibration with Application to Hard Disk Drives

TL;DR

This paper introduces a frequency separation based adaptive feedforward control method that effectively rejects wideband vibrations in hard disk drives by regionally identifying plant responses using bandpass filtering.

Contribution

It proposes a novel frequency separation algorithm that enables region-specific plant identification and compensation with low-order models for improved vibration control.

Findings

Effective vibration rejection in hard disk drives.

Region-specific plant modeling reduces complexity.

Improved control performance demonstrated.

Abstract

In this paper, a frequency separation based adaptive feedforward control algorithm is developed with the ability to identify the plant and do compensation region by region. In this algorithm, the accelerometer signal is filtered by a series of uniformly distributed bandpass filters to generate a bunch of subband signals which are mutually exclusive in spectrum. In each subband, the corresponding subband signal acts as the feedforward signal and only the frequency response of system in that region needs to be identified, thus a pretty low order model can be expected to have efficient compensation. Starting from the first region, the feedforward control parameters are learned simultaneously with the low order plant model in the same region and then moves to the next region until all the regions are performed.