微極性流體對滑動軸承之動態性能分析

Analysis of Non-Newtonian Dynamic Characteristics of Wide Slider Bearings Lubricated with Mcropolar Fluids

徐憲民(Hsien-Min Hsu)

指導教授 ： 翁芳柏

元智大學/工程學院/機械工程學系/碩士(2012年)

摘要

本文旨在探討微極性流體對滑動軸承之動態性能影響，同時比較傾斜面與拋物線面等二種不同形狀之軸承對軸承動態性能。在微極流體理論之基礎下對滑動軸承於使用非牛頓偶應力潤滑劑情況下之擠壓薄膜壓力、剛性以及阻尼性能。首先由連續方程式和動量方程式，配合邊界條件，推導出雷諾方程式。根據所得結果，使用非牛頓偶應力效應可以降低滑動軸承之摩擦參數。此種性能之改善，尤其在高偶應力參數值之情況下更為明顯。為能導引本研究之實務應用，本文亦提供數值實例以及計算之結果，有助於工程上之應用。

關鍵字

微極流體 ； 剛性係數 ； 阻尼係數

並列摘要

The objective of this thesis is to find out the effects of Non-Newtonian dynamic characteristics of wide slider bearings lubricated with micropolar fluids. Comparing to characteristics of plane and parabola wide slider bearings case. Based upon the micro-polar fluid theory, the dynamic film pressure and dynamic stiffness and dynamic damping characteristics of wide slider bearings lubricated with non-Newtonian couple stress fluids are mainly concerned. First, the Reynolds equation can be derived from the continuity equation, the momentum equation, and the specified boundary conditions. The effects of non-Newtonian couple stresses provide a reduction in values of the friction parameter. These improvements on bearing characteristics are more emphasized with increasing values of the couple stress parameter. A numerical example and the predicted results are also included for engineering application.

並列關鍵字

micropolar fluid ； dynamic stiffness coefficient ； dynamic damping coefficient

參考文獻

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