盧中仁臺灣大學：機械工程學研究所黃仕軒Huang, Shih-HsuanShih-HsuanHuang2007-11-282018-06-282007-11-282018-06-282005http://ntur.lib.ntu.edu.tw//handle/246246/60954光碟機在高速運轉時常因光碟片的偏心量而產生振動，並影響碟片資料的讀取，因此如何降低光碟機的偏心振動是一個重要的研究課題。目前在光碟機減振上應用最廣泛的裝置之一為滾珠型自動平衡裝置。常用的滾珠型平衡裝置的理論模型只有單一平面上的平移振動；然而實驗機台除了平移振動外，尚有扭轉模態，因此理論模型無法充分解釋實驗結果。本論文設計了一個只有平移模態的雙平台懸吊機構。首先利用適當的假設，建立簡化模型並推導運動方程式，求得平衡位置並分析其穩定性。接著製作實驗機台，實際量測滾珠型平衡裝置在雙平台懸吊機構上的減振功效，和理論分析的結果相比對。同時比較不同懸吊機構下滾珠型自動平衡裝置的效能。When the optical disk drive operates at high rotation speed, the inherent imbalance of the optical disk may cause large vibrations and prohibit data transfer. Therefore, how to reduce the imbalance vibrations of optical disk drives has been an important research topic. Ball-type automatic balancers are employed widely in optical disk drive industry. Most of the theoretical models developed for the ball-type automatic balancer only consider the planar translational vibrations. However, in additional to the translational vibration modes, the experimental platform used has torsional vibration mode. Hence, the theoretical model can’t explain all the experimental results. In this thesis, we designed a dual-stage suspension system that can only move translationally in a single plane. The governing equations of this dual-stage platform were derived under suitable assumptions. We then determined the equilibrium positions and studied the stability of each equilibrium position. The vibrational signals of the dual-state platform equipped with a ball-type automatic balancer were measured. The experimental results were compared with the theoretical results. We also investigated the vibration reduction effects of the ball-type automatic balancers equipped with different suspension systems.第一章 緒論………………………...………………………………………………..1 1-1 研究動機………………………………………………………………….…1 1-2 文獻回顧………………………………………………………………….…2 第二章 滾珠自動平衡裝置於單運動平台架構之動態分析......…………………...4 2-1 簡化模型建立………………………………………………………….……4 2-2 運動方程式……………………………………………………………….…4 2-2-1 極座標系運動方程式…..…….………………………………….….4 2-2-2 旋轉直角座標系運動方程式...………………………………….….7 2-3 平衡解...……………………………………………………………………..9 2-4 穩定性分析...………………………………………………………………15 2-4-1 極座標運動方程式線性化...…..…………………………………..15 2-4-2 旋轉直角座標運動方程式線性化.....……………………………..17 2-4-3 平衡解穩定性分析結果……...…..………………………………..18 2-4-5 參數變化與穩定區域...…………..………………………………..26 第三章 滾珠自動平衡裝置於單運動平台機台實驗……………………………..32 3-1 實驗儀器與設定………….………………………………………….........32 3-1-1 實驗儀器…………………………………………..........................32 3-1-2 實驗模擬機台………………………………………………..........35 3-1-3 實驗設置與流程…………………………………………………..37 3-2 實驗結果…………….…………………………………………………….38 3-2-1 實驗機台平衡……………………………………………………..38 3-2-2 單滾珠自動平衡裝置實驗…………………………………..........40 3-2-3 雙滾珠自動平衡裝置實驗………………………………………..44 3-2-4 滾珠自動平衡裝置一致性測試…………………………………..52 3-3 實驗結果與理論分析比對………………………………………………..56 3-3-1 由滾珠定位實驗結果判斷機台參數 …………………………...56 3-3-2 由滾珠穩定性實驗結果判斷機台參數 ………………………..58 3-3-3 振動穩態波形和理論結果比對…...……………………………...60 3-3-4 理論無法預測的現象…………...………………………………...65 第四章 改良機台理論分析..………………………………………………………68 4-1 運動方程式…………………...…………………………………………...70 4-2 暫態分析、平衡位置與穩定性…………...……………………………...72 4-2-1 暫態分析……………………..……………………………………72 4-2-2 =0平衡位置………………..…………………………………...74 4-2-3 完全平衡( )的穩定區域...…..………………………………75 第五章 滾珠自動平衡裝置於改良模擬機台實驗….…………………………….77 5-1 實驗機台設置…………………..…………………………………………77 5-2 實驗結果與理論分析比較……..…………………………………………79 5-2-1 由滾珠定位實驗結果判斷機台參數 .….……………………….79 5-2-2 振動穩態波形和理論結果比對………….….……………………81 5-3 結論………………………..………………………………………………86 第六章 總結……..……………...………………………………………………….87 附錄………………………...…..…………………………………………………...88 參考文獻……………….....………………………………………………………...901595462 bytesapplication/pdfen-US滾珠型自動平衡裝置偏心振動懸吊機構ball-type automatic balancerimbalance vibrationssuspension mechanismthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/60954/1/ntu-94-R92522531-1.pdf