臺灣博碩士論文加值系統

高科技資訊時代的來臨造就電子產品的出現，這些電子產品廣泛應用於家庭生活之間，其中電腦設備、DVD、數位相機…等，更是生活上常見電子產品。以DVD、HDD為例，隨著消費者對產品轉速、穩定性及精密度要求日益提升，目前光碟機52倍速已上市，轉速約10000rpm，這與雷射光點直徑、軸承尺寸相較是相當大的數值，故產品本身轉動時如何控制讀取碟片時所造成之誤差及碟片偏擺現象理應獲得進一步的改善。主軸馬達組裝中，軸承為轉子系統中重要的元件，傳統的滾珠軸承、含油軸承對於高精密度、高轉速的電子產品已不能滿足其需求，隨之發展的液動軸承目前為業界普遍應用於DVD、HDD設計上。液動軸承主要應用於高轉速、低負載軸承，利用凹槽產生動壓油膜將軸頸與軸承分離，以達到潤滑的目的，油膜具有抑止振動的效果，故可減低振動量，軸承剛性亦較含油軸承佳，軸承偏擺值約為5μm約為含油軸承的1/6。本研究主要利用數值模擬的方法來分析軸承內流場結構，在不同的邊界條件下，觀察不同凹槽外型下流場型態的改變，進而探討這些參數對於軸承本身剛性優劣之影響。

The development of hydrodynamic journal bearing is commonly applied to the manufacture industry of DVD and HDD, due to the need of nigh rotating speeds and low load bearing. It uses the regular groove to produce a pressure oily foam and then to separate the journal and bearing for achieving the lubrication. Besides, the oily foam can help to mitigate the problem of vibration. Thin thesis utilized the PHOENICS computer code to analyze the flow field structure for the various grooved geometries of the journal bearing. The effects of important design parametric on the pressure field are studied.

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
表目錄 v
圖目錄 vi
符號說明 ix
第一章 緒 論 1-1
1.1前言 1-1
1.2文獻回顧 1-2
1.3研究動機及目的 1-7
第二章 數學模型 2-1
2.1控制因子分析與選擇 2-1
2.2物理模型描述 2-1
2.3基本假設 2-4
2.4統御方程式 2-4
第三章 數值模擬方法 3-1
3.1電腦數值模擬 3-1
3.2格點分佈 3-1
3.3格點獨立測試 3-2
3.4收斂值之認定 3-2
3.5剛性係數之計算 3-3
第四章 結果與討論 4-1
4.1 Model（A）不同α角度壓力場驗證分析………………4-1
4.2 Model（B）不同凹槽高度分析…………………………4-4
4.3 Model（C）間隙高度分析………………………………4-7
4.4 Model（D）寬度比分析…………………………………4-10
4.5 Model（E）背脊比分析…………………………………4-13
4.6 Model（F）凹槽個數影響分析…………………………4-16
4.7 Model﹙G﹚人字型凹槽特性分析（波浪狀）…………4-19
4.8 Model﹙H﹚凹槽個數影響分析（波浪狀）……………4-22
第五章 結論 5-1
參考文獻 R-1
作者簡歷 A-1

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