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研究生:魏瑋廷
研究生(外文):Wei-Ting Wei
論文名稱:車用DVD光碟機之適應性聚焦伺服控制實現與應用
論文名稱(外文):Implementation and Application of Adaptive Focusing Control for DVD Drives in Vehicle Systems
指導教授:潘敏俊
指導教授(外文):Min-Chun Pan
學位類別:碩士
校院名稱:國立中央大學
系所名稱:機械工程研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
畢業學年度:93
語文別:英文
論文頁數:59
中文關鍵詞:光碟機適應性控制聚焦伺服
外文關鍵詞:LMSAFSCMVSS-FXLMSDVD drives
相關次數:
  • 被引用被引用:1
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本論文應用並實現適應性聚焦控制器於車用光碟機系統。此研究分為兩部份,首先設計架設於激振器上之光碟機振動平台,用以模擬行車振動;進而應用適應性聚焦伺服控制(AFSC)於光碟機上做前饋控制,以改善聚焦效能。LMS架構之適應性控制器已被廣泛採用,但此演算法收斂速度與穩定性較不適用於條件急速變化之環境,如光碟機使用於行車振動之情況等。本研究採用MVSS-FXLMS架構用以改善,此架構由濾波型最小均方(FXLMS)為基礎,並搭配可變收斂因子(MVSS)演算法,依據控制狀態增加FXLMS之收斂速度及穩定性。由此法產生之前饋控制訊號,能有效控制讀取頭跟隨外界振動進而達到消除擾動之效果;實驗結果顯示, AFSC能有效的消除車用光碟機上經由垂直振動產生之聚焦誤差。
The thesis presents the implementation and application of an adaptive focusing controller for DVD drives in recreation vehicle. This study includes two parts. The first part is to design and construct an optical disk drive platform mounted on a vibrating shaker which is to simulate a vehicle system with variant environment. The second is to apply and implement adaptive focusing servo control (AFSC) techniques in the employed optical disk drive platform. The applied AFSC is realized to improve focusing performance and based upon the adaptive control algorithm associated with optical disk drives. To adaptively suppress vibration influence on DVD drives, most of the conventional methods for AFSC are to extensively apply adaptive filtering with the least-mean-square (LMS) error algorithm. Unfortunately, convergence speed is often limited and unsatisfied with vibration environment of disk and/or varying filtering plant. It is noted that the learning process of the adaptive algorithm fails to quickly respond to the changing operational conditions. In the study, a modified variable step-size filtered-x-least-mean-square algorithm (MVSS-FXLMS) is implemented. The applied MVSS-FXLMS filtering algorithm is a combination of the MVSS convergence and FXLMS algorithms. The feedforward signal generated by the adaptive controller as an antivibration input can effectively suppress the primary source arising from the vibration disturbance. Experimentation indicates promising results that the AFSC can successfully eliminate the focusing error due to the vibration of DVD drives in vehicle systems.
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 Framework of the Thesis 4
CHAPTER 2 FOCUSING SERVO SYSTEM 6
2.1 Optical System of Pick-up Head 7
2.2 Voice Coil Motor Drive Unit 8
2.3 Focusing Error Signal 9
2.3.1 Astigmatism 9
2.3.2 Quadrant Detector 10
2.3.3 Focusing-error signal and S-curve 11
CHAPTER 3 BASIS ON ADAPTIVE FOCUSING SERVO SYSTEM 15
3.1 Adaptive Feedforward Disturbance Cancellation 16
3.2 Adaptive Filter 17
3.2.1 FXLMS adaptive filter 19
3.2.2 VSS algorithm 21
3.2 Focusing Servo System Identification 24
3.3 Adaptive Focusing Servo Control System 27
CHAPTER 4 EXPERIMENTAL INSTRUMENTS AND RESULTS 29
4.1 Establishment of the vibration environment 31
4.1.1 Design of optical disk drive vibration platform 31
4.1.2 Selections of vibrating frequency and acceleration 32
4.2 Experimental Circuit 35
4.3 BCB Control Interface and Parameters Setting 38
4.4 System Identification of the Focusing Actuator Model 40
4.5 Focusing Servo System Improvement 44
4.5.1 Simulation 44
4.5.2 Experimentation 47
4.6 Discussion 49
CHAPTER 5 CONCLUSIONS AND RESEARCH PROSPECTS 50
5.1 Concluding Remarks 50
5.2 Research Prospects 50
BIBLIOGRAPHY 52
APPENDIX A 55
APPENDIX B 58
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