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研究生:陳俊明
研究生(外文):Chun-Ming Chen
論文名稱:光碟機動態之研究
論文名稱(外文):Investigation of Dynamics for Optical Data Storage Systems
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:1999
畢業學年度:87
語文別:中文
論文頁數:120
中文關鍵詞:光碟機自然頻率模態振形近場光學空氣軸承耦合分析
外文關鍵詞:DVD-ROMnatural frequencyvibration modenear-field opticalair-bearing
相關次數:
  • 被引用被引用:12
  • 點閱點閱:238
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  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:1
本文分為兩部分。第一部分先探討傳統DVD光碟機。首先由電腦輔助設計軟體Pro/E繪出光碟機之機構體幾何模型,其次運用有限元素分析軟體ANSYS,將DVD光碟機機構體的幾何形狀網格化,分別求出光碟機構體重要零件的自然頻率及模態振形,並求出各零件組合後,整個系統的自然頻率與振形。然後探討機構體塗佈阻尼材料後機構體的抗振能力增加程度。第二部份為先進光碟機之光學讀取頭研究。先進光碟機運用近場光學原理讀寫資料,因此讀取頭的飛行高度必須被嚴格的控制,光碟片旋轉所擾起的氣流與讀取頭之間形成空氣軸承,空氣軸承在讀取頭表面所形成的壓力分佈為讀取頭昇力的主要來源。本文探討改變空氣軸承入口出口高度比、不同讀取頭長度及不同的讀取頭導角,對空氣軸承所產生昇力的影響。最後執行包含讀取頭和懸吊臂結構與流場的耦合分析,觀察流力造成的結構變形位移。
This study includes two parts. The first part investigates vibration of a DVD-ROM mechanism. The geometry files of the DVD-ROM are created by a computer-aided design software, Pro/E. Finite element analysis is carried out by ANSYS to obtain natural frequencies and vibration modes of each component in the DVD-ROM. In addition, this study examines vibration reduction performance of the DVD-ROM mechanism, on which surface coating of a damping material is applied. The second part investigates the disk-head interface of an advanced optical data storage system. The system uses near-field optical technology to read/write data so that the flying head must be positioned with greater precision. The pressure, caused by the air-bearing, is integrated over flying head surface, yields a lifting force to the flying head. Finite element method is employed to examine fluid lifting force distribution when changing the inlet-outlet height ratio, head length, and the chamfer angle. Finally, flow field analysis is coupled to structure analysis dealing with optical head and load arm, so as to observe structure deformation.
目 錄
中文摘要....................................................................................................i
英文摘要...................................................................................................ii
致謝...........................................................................................................iii
目錄...........................................................................................................iv
表目錄......................................................................................................vii
圖目錄.......................................................................................viii
第一章 緒論..........................................................................................1
第二章 多體機械系統的電腦輔助分析簡介.......................................6
2.1節 多體機械系統的定義............................................6
2.2節 多體動態分析軟體(DADS)簡介..............................7
2.3節 多體機械系統的動力分析............................................8
2.4節 加入撓性機構之多體機械系統..................................8
第三章 DVD機構體之有限元素模態分析及減振模擬................10
3.1節 讀取模組基板的有限元素分析.......................................10
3.2節 讀取模組基板的模態測試...............................................12
3.3節 阻尼墊圈的有限元素分析...............................................13
3.4節 導桿的模態分析...............................................................14
3.5節 讀取模組基板與導桿的組合分析...................................15
3.6節 光碟片的模態分析..........................................................16
3.7節 讀取模組基板-阻尼墊圈系統的模態分析....................17
3.8節 讀取模組基板的減振設計.............................................19
3.9節 阻尼值量測......................................................................20
3.9.1節 實驗 ..........................................................................21
3.9.2節 實驗結果 ..................................................................21
第四章 先進光碟機空氣軸承之理論推..............................................24
4.1節 從那維爾-史扥克斯方程式到雷諾方程式.....................27
4.2節 雷諾方程式的修正...........................................................28
4.3節 數值方法.........................................................................30
第五章 先進光碟機之讀取頭研究......................................................34
5.1節 先進光碟機系統簡介.......................................................34
5.2節 光碟片的幾何外形...........................................................35
5.3節 改變入口與出口高度比...................................................35
5.3.1節 入口與出口高度比對昇力的影響............................36
5.3.2節 不同光碟片轉速........................................................38
5.4節 改變光學讀取頭的長度...................................................40
5.5節 改變空氣軸承的出口高度...............................................41
5.6節 加入導角...........................................................................42
5.6.1節 直接加入導角.......................................................42
5.6.2節 擴大二維模型............................................................43
5.6.3節 固定h1/h2=1時加入導角.........................................44
第六章 氣流與讀取頭的相互影響......................................................46
6.1節 流場的幾何形狀與邊界條件...........................................46
6.2節 讀取頭及懸吊臂的幾何外形...........................................47
6.3節 半靜態的模擬結果...........................................................48
第七章 結論..........................................................................................50
7.1節 傳統光碟機.......................................................................50
7.2節 先進光碟機.......................................................................51
參考文獻 ................................................................................................54
表 目 錄
表3-1 讀取模組基板的自然頻率............................57
表3-2 讀取模組基板自然頻率之實驗值與模擬值比較....................58
表3-3 阻尼墊圈的自然頻率................................................................59
表3-4 導桿的自然頻率.....................................60
表3-5 讀取模組基板與導桿組合後的自然頻率................61
表3-6 加入導桿後讀取模組基板自然頻率的變化..............62
表3-7 光碟片的自然頻率...................................63
表3-8 讀取模組基板與阻尼墊圈系統的自然頻率..............64
表5-1 空氣性質....................................................................................65
表5-2 轉速對照表................................................................................65
表5-3 3600rpm讀取頭昇力.................................................................65
表5-4 7000rpm讀取頭昇力.................................................................66
表5-5 10000rpm 讀取頭昇力..............................................................66
表5-6 2mm讀取頭昇力........................................................................67
表5-7 3mm讀取頭昇力........................................................................67
表5-8 直接加上導角_讀取頭昇力......................................................68
表5-9 擴大模型_讀取頭昇力.............................................................68
表5-10 擴大模型_讀取頭昇力............................................................69
圖 目 錄
圖2-1 撓性機構分析的流程圖............................................................70
圖3-1 DVD機構體...............................................................................71
圖3-2 讀取模組基板............................................................................72
圖3-3 讀取模組基板的第一個模態....................................................72
圖3-4 讀取模組基板的第二個模態....................................................73
圖3-5 讀取模組基板的第三個模態....................................................73
圖3-6 讀取模組基板的第四個模態....................................................74
圖3-7 實驗裝置圖................................................................................75
圖3-8 讀取模組基板的四組頻率響應圖...........................................76
圖3-9 阻尼墊圈....................................................................................77
圖3-10 阻尼墊圈的第一個模態..........................................................77
圖3-11 阻尼墊圈的第五個模態..........................................................78
圖3-12 阻尼墊圈的第三個模態..........................................................78
圖3-13 阻尼墊圈的第四個模態.........................................................79
圖3-14 導桿.........................................................................................79
圖3-15 導桿的第一個模態.................................................................80
圖3-16 導桿的第二個模態.................................................................80
圖3-17 導桿的第三個模態.................................................................81
圖3-18 導桿的第四個模態................................................................81
圖3-19 讀取模組基板與導桿的組合圖............................................82
圖3-20 組合後的第一個模態...........................................................82
圖3-21 組合後的第二個模態...........................................................83
圖3-22 組合後的第三個模態...........................................................83
圖3-23 組合後的第四個模態...........................................................84
圖3-24 光碟片...................................................................................85
圖3-25 光碟片的第一個模態...........................................................85
圖3-26 光碟片的第三個模態...........................................................86
圖3-27 光碟片的第四個模態...........................................................86
圖3-28 光碟片的第六個模態...........................................................87
圖3-29 光碟片的第八個模態...........................................................87
圖3-30 讀取模組基板與阻尼墊圈組合圖.......................................88
圖3-31 組合後的第一個模態...........................................................88
圖3-32 組合後的第二個模態...........................................................89
圖3-33 組合後的第三個模態...........................................................89
圖3-34 組合後的第四個模態...........................................................90
圖3-35 組合後的第五個模態...........................................................90
圖3-36 組合後的第六個模態...........................................................91
圖3-37 組合後的第七個模態...........................................................91
圖3-38 組合後的第八個模態..........................................................92
圖3-39 暫態分析的邊界條件................................92
圖3-40 沒有塗佈阻尼材料的時間響應.......................93
圖3-41 單面塗佈阻尼材料的時間響應.......................93
圖3-42 三明治阻尼結構的時間響應..........................94
圖3-43 量測阻尼值實驗裝置圖..............................95
圖3-44 硬度30度墊圈的時間域圖..........................96
圖3-45 硬度40度墊圈的時間域圖..........................96
圖3-46 硬度50度墊圈的時間域圖..........................97
圖3-47 硬度30度墊圈的線性回歸..........................97
圖3-48 硬度40度墊圈的線性回歸...........................98
圖3-49 硬度50度墊圈的線性回歸...........................98
圖3-50 硬度30度墊圈的頻率域圖...........................99
圖3-51 硬度40度墊圈的頻率域圖...........................99
圖3-52 硬度50度墊圈的頻率域圖..........................100
圖4-1 邊界條件..........................................100
圖5-1 一般硬碟機構.........................................................................101
圖5-2 邊界條件..................................................................................101
圖5-3 有限元素模型的一角..............................................................102
圖5-4 不同高度比讀取頭表面壓力分佈.....................103
圖5-5 求得垂直向上的昇力.......................................105
圖5-6 h1/h2對讀取頭昇力的影響(3600rpm)..................................105
圖5-7 不同h1/h2值讀取頭表面壓力分佈........................................106
圖5-8 h1/h2對讀取頭昇力的影響(7000rpm)..................................106
圖5-9 h1/h2對讀取頭昇力的影響(10000rpm)................................107
圖5-10 不同轉速h1/h2值對昇力的影響..........................................107
圖5-11 不同讀取頭長度表面壓力分佈狀況....................................108
圖5-12 不同讀取頭長度昇力與h1/h2關係圖..................................108
圖5-13 不同讀取頭長度昇力與攻角關係圖....................................109
圖5-14 不同出口高度與昇力關係....................................................109
圖5-15 不同h2高度,讀取頭表面壓力分佈.....................................110
圖5-16 直接加上導角之邊界條件....................................................110
圖5-17 直接加上導角之幾何外形.....................................................111
圖5-18 導角對讀取頭昇力影響圖.....................................................111
圖5-19 擴大二維模型之邊界條件....................................................112
圖5-20 擴大二維模型之幾何外形....................................................112
圖5-21 擴大二維模型網格的一角....................................................113
圖5-22 h1/h2=2.5時,導角對昇力的影響..........................................113
圖5-23 h1/h2=1時,導角對昇力的影響.............................................114
圖6-1 分析程序..........................................115
圖6-2 流場的幾何外形......................................................................116
圖6-3 流場的邊界條件......................................................................116
圖6-4 流場之有限元素模型..............................................................117
圖6-5 讀取頭及懸吊臂之幾何外形..................................................117
圖6-6 讀取頭及懸吊臂之有限元素模型..........................................118
圖6-7(a) X向速度分量......................................................................118
圖6-7(b) Y向速度分量.......................................................................119
圖6-8 讀取頭附近的壓力分佈..........................................................119
圖6-9 讀取頭及懸吊臂的應力分佈..................................................120
圖6-10 讀取頭A點的垂直位移........................................................120
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