期刊刊名：科技學刊－科技類 　 卷期：16卷2期

篇名出版日期：2007年5月1日

作者：Jaw-Ren Lin, Rong-Fang Lu, Chin-Yi Chang, Won-Hison Liao,林昭仁,盧榮芳,張志毅,廖文賢

語言：English

關鍵字：journal bearings, finite lengths, couple stress effects, Stokes micro-continuum theory, linear stability characteristics,頸軸承,有限長度,偶應力效應,微連體理論,線性穩定性能

被點閱次數：0次

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摘要：
On the basis of the Stokes micro-continuum theory, the linear stability boundary of finite journal bearings with a non-Newtonian couple stress fluid is presented. Taking into account the couple stress effects resulting from the base oil blended with vari-ous additives, the two-dimensional non-Newtonian couple-stress dynamic Rey-nolds-type equation is numerically solved by the Preconditioned Conjugate Gradient Method. Application of the linear stability theory to the nonlinear journal-motion equations, the equilibrium solutions and the linear dynamic characteristics are then evaluated. From the results obtained, the non-Newtonian couple stresses signify ap-parent influences on the linear dynamic characteristics and stability behavior of the finite journal bearing. By replacing the classical Newtonian lubricant with the cou-ple stress fluids, the finite journal bearing with λ=1 predicts better stiffness char-acteristics (Sxx, Sxy, Syx and Syy ) and better damping characteristics (Dxx, Dxy, and Dyx ) at low or moderate values of the steady eccentricity ratio. On the whole, the effects of non-Newtonian couple stresses on the linear stability boundary are more pronounced for the bearing tending to be short and operating at higher steady eccentricity ratios. The present results provide engineers useful information in bear-ing designing and applications of journal-bearing systems.

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