本研究使用數值方法模擬熱效應對軸頸軸承性能之影響。絕熱條件是假設熱不會經由軸頸及軸襯而散失，但熱液動條件則有考慮其熱傳。結果顯示由於軸頸及軸襯對油膜之熱傳導，熱液動潤滑分析之壓力區的油膜溫度會高於絕熱情形。在固定偏心比時，恆溫條件之負載能力高於絕熱條件；由於在壓力區之油溫較高，熱液動條件之負載能力最低。
在熱液動條件及相同轉速時，隨著負荷增加，油膜厚度隨之下降，軸頸表面、軸襯內表面及油膜溫度會隨之而上昇。轉速愈高時其負荷影響愈顯著。固定偏心比時，半徑間隙愈大，油膜愈厚，油膜溫昇愈小。在絕熱條件下，軸歪斜時發現油膜厚度愈小處油之溫昇愈高，且油溫沿軸承之軸方向不均勻。

In this study, the numerical method was applied to simulate the thermal effects on the performance of journal bearings. In the adiabatic conditions, no heat was removed through either the journal or bushing, but the thermohydrodynamic conditions considered this heat transfer. Results showed that the temperature of the oil film at the pressure zone for the thermohydrodynamic conditions was higher than that of the adiabatic condition due to the heat conduction from the journal and the bushing to oil film. At the constant eccentricity ratio, the load capacity for the isothermal condition was higher than that of the adiabatic conditions, and the thermohydrodynamic conditions was the lowest due to higher temperature at the pressure zone.
Under the thermohydrodynamic conditions and the constant rotational speed, with increasing load, the thicknesses of the oil films decreased, so that the temperatures of the journal surface and the bush inner surface increased. This effect became significant at higher rotational speeds. At the constant eccentricity ratio, the greater the radial clearance, the thicker the oil film was, so that the temperature rice was decreased. Considering the deflection of the journal at the adiabatic conditions, results showed that the temperature rise increased at the thinner position of the oil film, and the oil temperature was not uniform along the axial direction of the bearing.

誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 xi
符號說明 xii
第一章 緒論 1
1.1 簡介 1
1.2 研究目的 1
1.3文獻回顧 2
1.4 論文架構 4
第二章 理論模型 5
2.1 油膜厚度 6
2.2 雷諾氏方程式 (Reynolds equation) 6
2.3 能量方程式 (Energy Equation) 11
2.4 絕熱之能量方程式 (Exact Adiabatic) 12
2.5 絕熱之能量方程式解析解 (UNC. Adiabatic) 13
2.6 熱液動潤滑之能量方程式 (THD) 14
2.7 固體表面溫度 15
2.8流程圖 18
第三章 結果與討論 19
3.1 恆溫條件之結果 19
3.2 絕熱之結果 19
3.3 熱液動潤滑(THD)之結果 21
3.4 軸歪斜之結果 23
第四章 結論 25
參考文獻 71

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