本研究主要的目的在於探討氣體軸承的物理性，研究的方法係以壓力量測的手段比較不同間隙比的情況下，軸心受外力發生偏移時，氣流於壁面上的壓力變化，進而了解軸心偏心運轉時軸承負荷能力的改變。本研究以電腦微型散熱風扇尺寸為參考，建構實驗模型。在壓力量測上使用皮托管、微壓力轉換器、數據擷取設備量測壓力變化，藉由這些量測數據做一平均處理，即可得到壁面上一點於固定轉速、偏心率、及間隙比的壓力值，再將軸心偏移產生間隙最小與最大處的壓力差值。分析結果發現，氣體軸承在某間隙比、轉速下，發生偏心運轉時有較佳的負荷能力，藉此可提供設計上的參考依據。

The main purpose of this research is to investigate the physical characteristics of air bearing. The experimental method is to compare the variant pressure in the wall when the eccentric axis rotates under different clearance ratios, and further understand the variations of loading capacities. The experimental model is made in accordance with CPU cooling fans. Measurement instruments include Pitot tube, the differential pressure transmitter, and the data logger. After averaging experimental data, the measurement indicates the pressure under constant ratio speed, eccentricity ratio and clearance ratio. Rotating eccentrically causes pressure differences between the two measuring points with smallest and largest clearances. From the result of this analysis, it is observed that there is an optimum loading capacity in some situation.

第一章緒論……………………………………………………… 1
1-1 前言………………………………………………………… 1
1-2 文獻回顧…………………………………………………… 1
1-3 軸承應用於微型風扇……………………………………… 3
1-4 氣體軸承分類及工作原理………………………………… 5
1-5 內容簡介…………………………………………………… 6
第二章參數定義與模型………………………………………… 7
2-1 氣體軸承於微型風扇上的工作原理……………………… 7
2-2 氣體軸承外型……………………………………………… 7
2-3 葉片座標系統……………………………………………… 8
2-4 幾何外型…………………………………………………… 8
2-5 葉輪模型…………………………………………………… 9
2-6 其他參數…………………………………………………… 10
第三章 實驗設備及量測…………………………………………… 12
3-1 實驗設備基本架構………………………………………… 12
3-2 量測設備…………………………………………………… 14
3-2-1 壓力量測設備……………………………………… 14
3-2-2 轉速量測設備……………………………………… 15
3-2-3 偏心移動…………………………………………… 15
3-2-4 資料擷取系統……………………………………… 16
3-3 實驗量測…………………………………………………… 17
3-3-1 軸心與軸承套同心定位…………………………… 17
3-3-2 壓力量測點的位置………………………………… 18
3-3-3 上層葉輪壓力量測………………………………… 19
3-3-4 下層葉輪壓力量測………………………………… 19
3-3-5 上層葉輪壓力量測加入軸心的影響……………… 20
第四章 結果與討論………………………………………………… 21
4-1 下層葉輪 Casing_L_01…………………………………… 21
4-2 上層葉輪 Casing_U_01…………………………………… 23
4-3 上層葉輪 Casing_U_01S………………………………… 26
4-4 上層葉輪 Casing_U_02…………………………………… 27
4-5 上層葉輪 Casing_U_02S………………………………… 28
4-6 上層葉輪 Casing_U_03…………………………………… 29
4-7 上層葉輪 Casing_U_03S………………………………… 31
第五章結論……………………………………………………… 33
5-1 壓力量測…………………………………………………… 33
5-2 實驗誤差…………………………………………………… 35
5-3 未來工作…………………………………………………… 36
參考文獻…………………………………………………………… 37
附表[1-1]…………………………………………………………… 43

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