Frequency Adaptive Control Technique and its Application to Disk Wobble and Runout Reduction in Optical Disk Drives
Date Issued
2004
Date
2004
Author(s)
Liu, Jieng-Jang
DOI
en-US
Abstract
This dissertation proposes a novel adaptive controller, namely frequency adaptive control technique (FACT) for periodic disturbance cancellation. The proposed adaptive scheme is equivalent to a linear controller and is constructed in a plug-in manner without altering the nominal closed-loop system configuration. A complete design and analysis for the compensation of periodic disturbance is achieved. The proposed adaptive algorithm is shown to be exponentially stable and the adaptive parameters are shown experimentally to be convergent. Compared with adaptive frequency control (AFC) methods, the analysis and experimental results show that FACT provides the ability to address the independence of the DC and harmonics cancellation so that the compensation for specific harmonics will not affect the other ones.
The functionalities of FACT are verified through an experimental application system consisting of a digital FPGA system and a high speed optical disk drive (ODD). The ODD is operated at various rotating speeds and modes, which causes various fundamental frequencies of periodic runout and wobble disturbances. It is shown experimentally that the runout effects both on track-following and fine seeking systems, and the wobble effects on focusing system are reduced significantly. Furthermore, FACT is demonstrated to be feasible to the cases that a single set of feedback controller fulfills the multiple playing speeds characteristic in ODDs.
Subjects
週期性干擾抑制
光碟機
適應控制
頻率適應控制技術
Frequency Adaptive Control Technique
Adaptive Control
Optical Disk Drives
Periodic Disturbance Rejection
Type
thesis
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