کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
616820 | 881530 | 2006 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Inverse approach for estimating rheological characteristics of adsorption layer in thin film EHL contacts
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
A modified Reynolds equation is derived for thin film elastohydrodynamic lubrication (TFEHL) by means of the viscous adsorption theory. This TFEHL theory can be used to explain the deviation between the measured film thickness and that predicted from the convenient elastohydrodynamic lubrication (EHL) theory under very thin film conditions. Results show that the thinner the film, the greater the ratio of the adsorption layer to the total film thickness becomes, and the greater the value of the pressure-viscosity index (zâ²). An inverse approach is proposed to estimate the pressure distribution based upon the film thickness measurement and to determine the pressure-viscosity index of oil film, and the thickness (δ) and the viscosity ratio (η*) of the adsorption layer in TFEHL circular contacts. Based on TFEHL theory, the inverse approach can reduce zâ² error, and provides a reasonably smooth curve of pressure profile by implementing the measurement error in the film thickness. This algorithm not only estimates the pressure, but also calibrates the film shape. Consequently, it predicts zâ², η*, and δ with very good accuracy. It can also be used to evaluate the lubrication performance from a film thickness map obtained from an optical EHL tester. Results show that the estimated value of zâ² is in very good agreement with the experimental data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tribology International - Volume 39, Issue 1, January 2006, Pages 50-59
Journal: Tribology International - Volume 39, Issue 1, January 2006, Pages 50-59
نویسندگان
Hsiao-Ming Chu, Rong-Tsong Lee, Yuang-Cherng Chiou,