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研究生: 黃振華
Huang, Zhen-Hua
論文名稱: 歪斜軸承的線性穩定分析
The Linear Stability Analysis of Misaligned Journal Bearings
指導教授: 李旺龍
Li, Wang-Long
學位類別: 碩士
Master
系所名稱: 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年: 2017
畢業學年度: 105
語文別: 中文
論文頁數: 139
中文關鍵詞: 歪斜軸承線性穩定性轉動慣量
外文關鍵詞: Misaligned Bearings, Linear Stability, Moment of Inertia
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  • 於本文中提出了適用於考慮潤滑劑的流變效應與固-液介面間粗糙度與非等向滑移條件的歪斜軸承之平均修正型雷諾方程式,並將其線性化以進行穩定性分析。除此之外,還分析了不同尺寸的元件對線性穩定性的影響。
    透過有限元素法求解推導得到的穩態與動態方程式之後,得到不同變因之下(滑移方向與長度、流變效應的流量指數、粗糙度標準差與粗糙度型式、歪斜角度的大小與方向)負載與臨界質量的變化,在計算歪斜軸承的穩定性時,不同於以往,本文中考慮了微擾發生時對歪斜角度造成的變化,並以力矩的角度切入考慮其對線性穩定性的影響。
    最終結果表明了不同細長比的軸承主導流的方向並不相同,而契合主導流的滑移方向與粗糙度型式將使液膜不易建立動壓,從而導致負載與臨界質量的下滑,而粗糙度的影響力隨著膜厚比的增加而減少。當流量指數大於一時,流體黏度承受剪應力時會上升,相反地,小於一時黏度將會下降,比較三種流體作為潤滑劑的表現,剪切致稠流體的負載與臨界質量皆大於牛頓流體,又大於剪切稀化流體。歪斜軸承的負載與臨界質量皆隨著歪斜角度的增加而增加,而且考慮軸心尺寸時,軸心尺寸越細長,臨界質量越低,不同軸心尺寸對臨界質量的影響隨著細長比增加而增加。

    The average modified Reynolds equation (modified ARE) considering anisotropic slip boundary condition, roughness and rheology of misaligned journal bearing is derived in this study. The modified Reynolds equation and the motion equation are linearized about the equilibrium position to analyze the linear stability of the journal bearing system. From the derived equation above, the static and dynamic performance is obtained with various parameters. The change of misaligned angle induced by the perturbation is considered in this study, and it will be take into consideration with the viewpoint of moment when the stability of misaligned bearing is calculated.
    The results show that the slip direction and roughness pattern which match the dominant flow will deteriorate the load and critical mass. So the effect of anisotropic slip and roughness are different with different slenderness ratio. The stability of the bearing system optimizes with increasing power-law index and the misaligned angle. The size of bearing shaft will affect the stability of misaligned journal bearing, the longer or more slender shaft is, the worse the stability. The effect of the shaft size is obvious when the slenderness ratio is higher.

    中文摘要 iii 英文摘要 iv 致謝 xvi 目錄 xvii 圖目錄 xx 表目錄 xxiv 符號對照表 xxv 第一章 緒論 1 1.1 前言 1 1.2 文獻回顧 2 1.2.1 非等向滑移邊界條件 2 1.2.2 流變效應 3 1.2.3 粗糙度效應 3 1.2.4 歪斜軸承 5 1.2.5 軸承的動態行為與穩定性 5 1.3 研究動機 6 1.4 論文結構 6 第二章 平均修正型雷諾方程式 10 2.1 雷諾方程式 10 2.1.1 流體的質量守恆(微分形式的連續性方程式) 10 2.1.2 流體的動量守恆 11 2.1.3 奈維爾,史托克方程式(Navier-Stokes Equation) 12 2.1.4 雷諾方程式 13 2.2 非等向邊界滑移 15 2.3 流變效應 17 2.3.1 考慮流變效應與非等向性滑移的雷諾方程式 18 2.4 粗糙度效應 23 2.4.1 含粗糙度的雷諾方程式 23 2.5 軸承的歪斜 26 2.6 軸承性能分析 28 2.6.1 穩態軸承負載 29 2.6.2 歪斜軸承力矩 31 第三章 穩定性分析理論 33 3.1 方程式線性化 33 3.1.1 線性微擾法 33 3.2 動態係數定義 36 3.2.1 廣義動態係數定義 36 3.2.2 無歪斜軸承動態係數定義 43 3.3 軸承穩定性理論 44 3.3.1 廣義穩定性理論 44 3.3.2 無歪斜軸承穩定性理論 49 第四章 數值分析 51 4.1 有限元素法簡介 51 4.2 有限元素法離散化 51 4.3 空蝕效應 53 4.4 軸承分析操作參數 54 第五章 穩態結果與動態係數分析 56 5.1 分析結果驗證 56 5.2 軸承穩態分析 56 5.2.1 耦合粗糙度效應與滑移效應的穩態分析 58 5.2.2 耦合粗糙度效應與流變效應的穩態分析 63 5.2.3 無歪斜軸承綜合討論 67 5.2.4 歪斜軸承穩態分析 70 5.2.5 考慮非等向滑移的歪斜軸承之穩態分析 77 5.3 動態係數分析 83 第六章 線性穩定性結果與討論 88 6.1 線性穩定性判斷驗證 88 6.2 軸承之線性穩定性分析 90 6.2.1 耦合粗糙度效應與滑移效應的線性穩定性分析 90 6.2.2 耦合粗糙度效應與流變效應的線性穩定性分析 96 6.2.3 無歪斜軸承綜合討論 100 6.2.4 歪斜軸承的線性穩定性分析 103 6.2.5 考慮非等向滑移的歪斜軸承之線性穩定性分析 110 第七章 結論 116 參考文獻 118 附錄 121

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