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Student Number 91323111
Author Min-Der Wu(吳敏德)
Author's Email Address s1323111@cc.ncu.edu.tw
Statistics This thesis had been viewed 1432 times. Download 10 times.
Department Mechanical Engineering
Year 2003
Semester 2
Degree Master
Type of Document Master's Thesis
Language English
Title Dynamic Investigation and Adaptive Tracking Error Improvement of an Optical Disk Drive
Date of Defense 2004-07-15
Page Count 44
Keyword
  • adaptive feedforward cancellation
  • amplitude modulation
  • FXLMS
  • spectrogram
  • tracking acturator
  • tracking error
  • Abstract In the trend of increasing data storage density and reducing access time is to satisfy the higher data storage device of the optical disk drives, the disk must is driven by the spindle motor in high speed. The vibration of the disk is easily caused in high speed. In the study, the dynamic characteristics of the rotating disk at different speed used the spectrogram of the signal processing will be investigated. The results show the spectrogram is demonstrated on data measured to the transient phenomenon from a run-up rotating disk is effective. In the experiment, the disk eccentricity and the modulation frequencies with natural frequencies of the disk can be clearly observed from the spectrogram.
    The tracking servo of the optical disk drives is control a voice coil motor which moves a tracking actuator reaches to the data track for the pick up data. The disturbance influencing tracking error results from the eccentricity of the rotating disk in high speed. How to reduce the tracking error and improve tracking performance will be discussed. Adaptive feedforward cancellation (AFC) can effectively cancel the periodic disturbance. The experiment results show the AFC apparently eliminated the tracking error arising from the eccentricity of the rotating disk.
    Table of Content AbstractI
    ContentsII
    List of FiguresIV
    List of TablesVI
    Chapter 1 Introduction1
    1.1 Motivation1
    1.2 Literature Survey2
    1.3 Outline of the Thesis4
    Chapter 2 Theoretical Basis5
    2.1 Tracking Servo5
    2.1.1 Long Tracking5
    2.1.2 Short Tracking6
    2.2 Applied Signal Processing Techniques6
    2.2.1 Spectrogram6
    2.2.2 Amplitude Modulation8
    2.3 Adaptive Fliter9
    2.3.1 LMS Adaptive Filter9
    2.3.2 FXLMS Adaptive Filter11
    2.3.3 Adaptive Feedforward cancellation12
    2.4 AFC Tracking Control14
    2.5 System Identification16
    Chapter 3 Dynamic Characteristics of a Rotating Disk20
    3.1 Experimentation20
    3.2 Analysis and Discussion21
    3.3 Summary26
    Chapter 4 Adaptive Tracking Error Improvement27
    4.1 Experimental Setup27
    4.2 Experimental Circuit29
    4.3 BCB Control Interface and Parameters Setting30
    4.4 System Identification of the Actuator Model32
    4.5 Tracking Error Improvement35
    4.5.1 Simulation35
    4.5.2 Experimentation38
    4.6 Results and Discussion41
    Chapter 5 Conclusions42
    5.1 Concluding Remarks42
    5.2 Future Works42
    Bibliography43
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    Advisor
  • Min-Chun Pan(潘敏俊)
  • Files
  • 91323111.pdf
  • disapprove authorization
    Date of Submission 2004-07-19

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