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研究生:許貿淳
研究生(外文):Mao-Chun Hsu
論文名稱:近場光碟片之振動分析與實驗
論文名稱(外文):Vibration Analysis and Experiment for Near-Field Optical Disks
指導教授:呂宗熙
指導教授(外文):Tzong-Shi Liu
學位類別:碩士
校院名稱:國立交通大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
中文關鍵詞:近場光碟機近場光碟片碟片振動
外文關鍵詞:Near-field optical diskvibration
相關次數:
  • 被引用被引用:6
  • 點閱點閱:183
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近場光碟機為一突破光學繞射的資料貯存裝置,貯存容量遠大於目前光碟機數十倍,所採用的讀寫機構造類似目前的硬碟機,讀寫頭利用空氣軸承飛行於碟片上方約20nm。穩定的飛行利於讀寫頭的尋軌、循軌和聚焦,但碟片的缺陷,軸承的間隙,讀寫頭所施予的空氣壓力,都會造成碟片的振動。
本研究主要是探討近場光碟機的碟片振動,並探討碟片自然頻率和楊氏係數的關係,以利碟片材質的選用,再以ANSYS和DADS軟體建立碟片模型,分析碟片在特定轉速時的振動量,以及碟片啟動時的暫態情形和不同轉速間碟片的振動比較,並輔以雷射都卜勒干涉儀驗證,本研究成果將有助於從事光碟機讀寫頭設計與控制。
Near-Field Optical Disk Drive (NFODD) is a promising device for data storage with capacity much larger than current DVD-ROMs. The flying pickup head in NFODD has to fly stably around 20nm height above a disk surface by means of air bearing. Stable flight is required to undergo track-seeking and focusing. However, disk flaws, bearing clearance, spindle motor and air bearing cause the disk to vibrate.
This research aims to investigate disk vibration of NFODD. Flexible disk models are generated in the finite element and multibody dynamics softwares to analyze vibration modes and deformation during disk rotation. Experiments are carried out using a Laser Doppler Vibrometer to compare simulation results.
ABSTRACT (in Chinese).........................................I
ABSTRACT (in English)........................................II
Acknowledgement.............................................III
TABLE OF CONTENTS............................................IV
LIST OF FIGURES..............................................VI
LIST OF TABLES................................................X
Chapter 1 Introduction........................................1
1.1 Literature Survey....................................1
1.2 Objective and Scope..................................3
Chapter 2 Near-Field Optical Disk Drive.......................4
2.1 Optical Disk Drive ...................................4
2.2 Optical Disk.........................................5
Chapter 3 Young’s Modulus and Natural Frequency..............7
3.1 Natural Frequency Formula............................7
3.2 ANSYS Model......................................... 9
3.3 Damping Ratio Measurement...........................10
Chapter 4 Vibration Analysis.................................12
4.1 Steady State........................................12
4.2 Transient State.....................................13
4.3 Aerodynamic Analysis................................14
4.4 Vibration at Different Speeds.......................15
4.5 Standard Deviation ..................................16
Chapter 5 Vibration Measurement..............................17
5.1 Experimental Setup..................................17
5.2 Measurement of Disk Vibration.......................18
5.3 Experimental Results................................19
5.3.1 Steady state ...........................................19
5.3.2 Transient state........................................20
Chapter 6 Comparison between Simulation and Measurement ....................................................22
Chapter 7 Conclusion.........................................24
References...................................................25
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