Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14861
Title: Robust periodic disturbance compensation via multirate control
Authors: DUAN CHANG
Keywords: Adaptive feedforward, disturbance rejection, multirate sampling, runout compansation, servo control
Issue Date: 21-Jul-2005
Source: DUAN CHANG (2005-07-21). Robust periodic disturbance compensation via multirate control. ScholarBank@NUS Repository.
Abstract: In this thesis, an adaptive feedforward cancellation (AFC) scheme based on multirate discretization is proposed for compensation of periodic disturbance in hard disk drive (HDD) digital servo systems. By discretizing the plant via multirate scheme, we obtain the inverse of the closed-loop transfer function no matter whether the closed-loop system is a minimum phase one or not. The proposed scheme cancels selected repeatable runout (RRO)components rapidly without amplifying unselected higher frequency harmonics. Simulation and experiment results show that the scheme can attenuate selected RRO harmonics efectively, even at around the open-loop crossover frequency range which cannot be achieved by the usual AFC scheme. The proposed scheme is also robust against plant parameter variations.
URI: http://scholarbank.nus.edu.sg/handle/10635/14861
Appears in Collections:Master's Theses (Open)

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