光碟機之動態研究與適應性尋軌誤差改善

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姓名

吳敏德(Min-Der Wu) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

光碟機之動態研究與適應性尋軌誤差改善
(Dynamic Investigation and Adaptive Tracking Error Improvement of an Optical Disk Drive)

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摘要(中)

在提昇光碟機儲存密度及減少存取時間的趨勢下，負責承載碟片的主軸馬達將以極高倍速運轉，在高倍速運轉下的碟片容易激發出振動，其中碟片不平衡所引致之偏心振動在高倍速下更是明顯。
本研究以時頻圖來探討不同轉速下旋轉碟片的動態特性，由實驗結果之時頻圖可清楚看出碟片的偏心及與碟片自然頻率的調變現象，光碟機尋軌伺服為控制音圈馬達來移動讀寫頭，在碟片上的各資料軌讀取資料。如何在高倍速及旋轉碟片偏心所產生的干擾下，降低讀寫頭尋軌誤差並提昇其性能，研究中以適應性前饋干擾消除有效地抑制具有週期性的重複干擾，經由實驗結果顯示，具週期性的重複干擾在適應性前饋干擾消除下明顯地抑制了碟片偏心所產生的尋軌誤差。
攜帶方便，抽取容易是光碟機儲存資料最大的優點，在光碟片置入光碟機的同時，碟片偏心即已產生，當啓動光碟機後，碟片偏心所產生的不平衡，會增加讀寫頭的循尋誤差，希望本研究對消除碟片偏心所產生的循尋誤差能提供些許助益。

摘要(英)

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.

關鍵字(中)

★ 適應性尋軌誤差
★

關鍵字(英)

★ spectrogram
★ amplitude modulation
★ tracking error
★ tracking acturator
★ FXLMS
★ adaptive feedforward cancellation

論文目次

Abstract I
Contents II
List of Figures IV
List of Tables VI
Chapter 1 Introduction 1
1.1 Motivation 1
1.2 Literature Survey 2
1.3 Outline of the Thesis 4
Chapter 2 Theoretical Basis 5
2.1 Tracking Servo 5
2.1.1 Long Tracking 5
2.1.2 Short Tracking 6
2.2 Applied Signal Processing Techniques 6
2.2.1 Spectrogram 6
2.2.2 Amplitude Modulation 8
2.3 Adaptive Fliter 9
2.3.1 LMS Adaptive Filter 9
2.3.2 FXLMS Adaptive Filter 11
2.3.3 Adaptive Feedforward cancellation 12
2.4 AFC Tracking Control 14
2.5 System Identification 16
Chapter 3 Dynamic Characteristics of a Rotating Disk 20
3.1 Experimentation 20
3.2 Analysis and Discussion 21
3.3 Summary 26
Chapter 4 Adaptive Tracking Error Improvement 27
4.1 Experimental Setup 27
4.2 Experimental Circuit 29
4.3 BCB Control Interface and Parameters Setting 30
4.4 System Identification of the Actuator Model 32
4.5 Tracking Error Improvement 35
4.5.1 Simulation 35
4.5.2 Experimentation 38
4.6 Results and Discussion 41
Chapter 5 Conclusions 42
5.1 Concluding Remarks 42
5.2 Future Works 42
Bibliography 43

參考文獻

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指導教授

潘敏俊(Min-Chun Pan)

審核日期

2004-7-19

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