臺灣博碩士論文加值系統

中文摘要
由於電流變液在擠流下具有較剪切及流動模式下更好之ER效應，因此本論文主要針對電流變液在轉盤間擠壓流模式之應用研究，當荷重改變或是轉動速度改變時，如何利用電流變液的特性有效地控制轉盤的扭矩與軸向承載力。相關的研究發展運用，可成為智慧型止推軸承或離合器的基礎。由於止推軸承作動乃軸向受負載荷重而且輪軸與軸承作相對旋轉運動，因此，本研究在轉盤間旋轉及擠流不互相影響的假設下，推導此一轉盤間在不同轉速、激振位移振幅與頻率及外加電場下之承載力，並以實驗量測結果作為理論分析之驗證。透過扭力計的量測後，更可了解此一系統在運轉中傳動損失與各項操作、控制條件之關係。並且藉由改變電極表面之局部幾何形狀，造成電場強度分佈變動，以形成較粗大之鏈狀粒子結構，增強結構鏈強度，增強ER流體在使用環境下，對外加電場強度有最佳的效果。因此我們設計了三組具有不同電極表面型態的測試台，來探討電流變液如何在擠流之應用型態下，更有效地提高外加電場所產生的電流變液之效應，以期建立控制電流變液在轉盤間潤滑承載效果之分析模式，並將研究的成果應用在未來智慧型軸承的設計。
關鍵字：電流變液、擠壓模式、止推軸承、智慧型軸承。

ABSTRACT
It is known that the electrorheogical (ER) fluid demonstrates better ER effect in the squeeze mode operation than in shear or flow modes. Hence, this thesis concentrates on the application of the ER fluid contained between rotating circular disks and operated in squeeze mode. When the axial loading or rotating speed of the disks has changed, the torque and axial loading capacity of this ER film damper can be controlled by adjusting the applied electric field. The result of this study can apply to the related research in the smart thrust bearing and transmission clutch. In the theoretical formulation, based on linear assumption, the rotating behavior and the squeezing dynamics of the ER fluid between two circular disks are uncoupled from each other. Therefore, the axial loading capacity and the rotation torque of the circular disks under different rotation speeds, amplitudes and fre- quencies of axial displacement are derived. The loading character- istics of this rotating ER squeeze film damper are also measured using an experimental test rig setup in this study. The measurements in axial loading capacity and rotating torque of the ER squeeze film damper under various operation circumstances verify the accuracy of the theoretical formulation. In addition, the modification on the surface morphology of the rotating electrodes can alter the local distribution of the electric field between them. These could make the suspension particles in the ER fluid aggregate into thicker chain-like structure upon the application of electric field. Thereby the ER effect can be enhanced. Accordingly, three circular electrodes with different surface morphology are studied experimentally. The result suggests the modification on the electrode surface can provide a feasible method for improving the ER effect on this rotating squeeze film damper. It is expected that the results of this study can be applied to the related field in the design of the ER smart bearings.
Keywords: electrorheological fluid, squeeze mode, thrust bearing, smart bearing.

目錄
封面內頁 頁次
簽名頁
博碩士論文電子檔案上網授權書 iii
博碩士論文授權書 iv
中文摘要 v
英文摘要 vi
誌謝 viii
目錄 ix
圖目錄 xi
表目錄 xv
符號說明 xvi
第一章 緒論 1
1.1前言 1
1.2 研究動機 1
1.3 研究目的 2
1.4 內容概述 4
第二章 文獻回顧 5
2.1 電流變液簡介 5
2.2 目前電流變液在擠壓流方面研究 8
第三章 研究方法及理論 11
3.1 電流變液的雙黏性模型 11
3.2轉盤間擠壓承載之理論推導 12
3.2.1電流變液在轉盤間旋轉流的理論推導 13
3.2.2電流變液在電極平板間擠流動的理論推導 20
3.2.3相對旋轉混合軸向擠壓的理論推導 24
第四章 系統實驗的結果與討論 26
4.1 電流變液的製備 26
4.2 實驗量測之設備儀器架構 26
4.3 在轉盤間單純擠流測試 30
4.4 流體在轉盤間擠壓承載測試 48
4.5 流體在轉盤間旋轉時的扭力量測 63
4.6 幾何形狀對系統影響的測試 70
第五章 結論與建議 78
5.1 結論 78
5.2 後續研究方向 79
參考文獻 81

參考文獻
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