Variable Linear Velocity Control of High Data Rate DVD-ROM Drives

• Main Authors: Chun-Hung Liu, 劉俊宏
• Other Authors: Wei-Song Lin
• Format: Others
• Language: en_US
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/49925249484675115964

碩士 === 國立臺灣大學 === 電機工程學研究所 === 87 === DVD has become one of the most important media for saving digital data. Due to the high-density distribution of tracks on a DVD disc, the control actions of data retrieving on it is much more difficult than that of a CD disc. Therefore, to achieve high performance in data rate, a DVD-ROM drive must have the abilities of short access time and high data transfer rate. The objective of this research is mainly to develop a control method that considers the uncertainties of the motor system and achieves high-speed seeking and tracking of the optical pickup unit (OPU) so that the proposed variable linear velocity (VLV) algorithm can be realized. The proposed method is a combination of nonlinear feedback linearization and model reference adaptive control. The theoretical analysis and simulation results are presented to confirm the performance of the design. The VLV algorithm is shown to be able to ameliorate the connatural drawbacks of constant linear velocity (CLV) and constant angular velocity (CAV) algorithms.