Mu-synthesis analysis in the optical pickup head with tilting control system
Date Issued
2004
Date
2004
Author(s)
OuYang, Ko-Hsin
DOI
zh-TW
Abstract
Recent advancement in the high-definition digital versatile disk technique has imposed stringent demand on the optical pickup head tracking performance. In addition to focus and tracking control, the optical pickup head comes with tilt compensation capability is also becoming popular to compensate for the disk radial tilt. This thesis describes the dynamic modeling of the three degree-of-freedom optical pickup head actuator. The tilting angle in the pickup head system resulted in highly nonlinear dynamic behavior and the coupling effect will appear when tilt actuator actions, therefore, the system becomes very difficult to control. The conventional servo design approaches had been using separate control loops, and had often neglected the coupling effect. This thesis proposes a formulation to express the change in the dynamic behavior by some structured system uncertainties. The popular Mu-controller synthesis technique can then help to design a robust tracking controller. The simulation result shows that the proposed controller capable to operate under very extreme disturbances while the conventional controller can’t achieve. The systematic design procedure is also straight forward for the practice engineers to carry out.
Subjects
光學讀寫頭
強韌性
不確定性
光碟機
Mu合成
optical disk drive
optical pickup
Mu-synthesis
uncertainty
robustness
Type
thesis
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