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http://dx.doi.org/10.5050/KSNVN.2005.15.10.1148

Robust Servo Design and Application for Optical Disk Drive Using Robust Control Theory : H∞ vs. QFT  

Lee, Kwang-Hyun (연세대학교 CSID)
Yang, Hyunseok (연세대학교 CSID)
Park, No-Cheol (연세대학교 CSID)
Park, Young-Pil (연세대학교 CSID)
Choi, Jin-Young (연세대학교 CSID)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.15, no.10, 2005 , pp. 1148-1159 More about this Journal
Abstract
In this paper, the various uncertainties generated in an optical disk drive (ODD) and the robust servo designs considering the uncertainties are studied. First, the brief introduction an ODD and the servo error tolerance of it are discussed. Then, the classifications of uncertainty and the concept of relative stability are introduced. Considering the uncertainty of an ODD, two robust control approaches are applied: (i) mixed sensitivity approach in H$\infty$ control theory for unstructured uncertainty, (ii) QFT for structured uncertainty Finally, the designed controllers are realized by DSP, and these controllers are applied to a commercial DVD-ROM drive. From these experiments, we prove that the designed robust controllers have more good disturbance rejection performance and robustness when it is compared to the conventional lead-lag controller.
Keywords
Optical Disk Drive; Robust Control; QFT; Mixed Sensitivity; Disturbance;
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