本文使用熱液動潤滑理論來預測主軸歪斜之艉軸管後軸頸軸承的最小油膜厚度，控制方程式包括雷諾氏、能量方程式及軸襯熱傳導方程式。以有限差分法求解 耦合的方程式，得到油膜壓力及溫度分佈，並以無窮級數求解軸襯的溫度分佈。探討在轉速、負荷、幾何尺寸對艉軸管後軸承之軸承及油膜溫度、油膜壓力、最小油膜厚度與姿態角的影響。
數值結果顯示，高轉速之最小油膜厚度與負荷的關係為線性且油膜剛性較高，而低轉速時為非線性且油膜剛性較低。為滿足轉速20 rpm以下之最小油膜厚度容許值，需降低滑油的進口油溫或軸襯內表面的溫度。軸襯外表面為高熱傳系數的流體，例如:冷水，可降低軸襯溫度。將所得之最小油膜厚度，利用最小平方差法提出經驗公式，可適用於一般軸系與低速軸系之設計。

This paper intends to predict the minimum film thickness of stern tube bearing considering the misalignment caused by shaft deformation based on the thermo-hydrodynamic theory. Reynolds and energy equations are derived and solved simultaneously by the finite difference method, and the temperature distribution in the bearing bush is calculated using an infinite series in solving heat-conduction equation. Effects of rotational speed, bearing load, and bearing geometries on the bush and oil film temperature, film pressure, minimum film thickness and attitude angle are investigated.
Results show that relationship between minimum film thickness and load is linear and the film stiffness is higher at high speeds, while those are nonlinear and lower at low speeds. To meet the requirements of the minimum film at the speeds lower than 20 rpm, the inlet temperature of the oil and/or the temperature of bush inner surface should be as small as possible. The temperature of the bush can be decreased using fluid with higher heat transfer coefficient on the bush outer surface, such as cold water. Empirical formulas for the minimum thickness in terms of the bearing number are derived by least square method for the general cases and the lower speed cases.

目錄
誌謝 i
中文摘要 ii
英文摘要 iii
目錄 iv
圖次 vi
表次 ix
符號說明 x
第一章 緒論 1
1.1 簡介 1
1.2 研究目的 2
1.3 文獻回顧 2
1.4 論文架構 5
第二章 研究方法及步驟 6
2.1 雷諾氏方程式（Reynolds Equation） 6
2.2 能量方程式（Energy Equation） 10
2.3 計算軸襯固體表面溫度 12
第三章 結果與討論 15
3.1 與現有理論結果比較 15
3.2 艉軸管後軸承之潤滑分析 16
3.3 半徑間隙對油膜性質之影響 20
3.4 對流係數對油膜性質之影響 21
3.5 滑油粘度對油膜性質之影響 21
3.6 軸襯接觸長度對油膜性質之影響 23
3.7 供油槽之冷卻效應 23
3.8 預測艉軸管軸承之最小油膜厚度 25
第四章 結論 26
參考文獻 63

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