臺灣博碩士論文加值系統

本文針對人字型主軸溝槽(GJPS)和軸襯溝槽(PJGS)之軸頸軸承的設計參數進行液動潤滑穩態和動態特性分析，設計參數包括溝槽寬度比、溝槽深度比、溝槽角度、和溝槽位置。過去對於GJPS和PJGS軸頸軸承均使用相同之油膜方程式，本文修正GJPS軸頸軸承的油膜方程式以獲得更精確值，並轉換座標而求得新雷諾方程式，可運用於任意溝槽角度之模擬，並得到各設計參數之穩態解。再使用微擾法將非線性動態雷諾氏方程式簡化為線性，得到各設計參數之暫態解及動態性質，探討設計參數對負載能力、剛性係數、阻尼係數、和臨界質量的影響。
數值結果顯示兩種軸頸軸承在溝槽寬度比為0.5、偏心比為0.2、溝槽深度比為1.0、溝槽角度為33度時的負載能力為最佳，但是 PJGS軸頸軸承負載能力高於GJPS軸頸軸承。在溝槽寬度比為0.5、偏心比為0.3、溝槽深度比為1.0、溝槽角度為28度條件下，剛性係數與阻尼係數可達最大值，但是PJGS軸頸軸承動態係數高於GJPS軸頸軸承，其臨界質量與臨界振動頻率為最小且最穩定，但是PJGS軸頸軸承比GJPS軸頸軸承的穩定性佳。

The steady and dynamic characteristics of the hydrodynamic lubrication for the herringbone-grooved journal bearing with plain sleeve (GJPS) and plain journal bearing with grooved sleeve (PJGS) are analyzed under various design parameters, including the ratio of groove width, ratio of groove depth, groove angle, and position of groove. In the previous studies, the equation of film thickness used by GJPS and PIGS is the same. It has been corrected by this study to obtain an accurate film thickness for GJPS. Reynolds equations suitable for all groove angles are derived using the coordinate conversion, so that it can be applied to obtain the steady state solution under various design parameters. A perturbation method is used to linearize the nonlinear dynamic Reynolds equations, so that the transient state solutions and dynamic characteristics under various design parameters can be obtained. Effects of the design parameters on the load capacity, stiffness coefficient, damping coefficient and critical mass are investigated.
Numerical results show that GJPS and PJGS have the greatest load capability at ratio of groove width 0.5, eccentricity ratio 0.2, ratio of groove depth 1.0, and groove angle 33 degrees, but PJGS has higher load capability than that of GJPS. At ratio of groove width 0.5, eccentricity ratio 0.3, ratio of groove depth 1.0, and groove angle 28 degrees, stiffness and damping coefficients achieve a maximum value, but PJGS has higher values of the stiffness and damping coefficients than that of GJPS. Moreover, their critical mass and onset whirl ratio achieve minimum with most stable, but PJGS is more stable than that GJPS.

論文審定書 i
誌謝 ii
中文摘要 iii
英文摘要 iv
目錄 v
圖次 vii
表次 x
符號說明 xi
第一章 緒論 1
1.1 簡介 1
1.2 研究目的 2
1.3 文獻回顧 3
1.4 論文架構 5
第二章 研究方法及步驟 9
2.1 雷諾氏方程式 9
2.2 座標轉換法 11
2.3 動態雷諾氏方程式 16
2.4 油膜負荷參數 27
2.5 軸承穩定性之分析 27
2.6 油膜厚度改良 32
第三章 結果與討論 46
3.1 與理論模擬比較 46
3.2 與實驗結果比較 48
3.3 人字型溝槽軸頸軸承之幾何分析 49
3.4 人字型溝槽軸頸軸承之動態特性分析 52
第四章 結論 74
參考文獻 75

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