Please use this identifier to cite or link to this item:
|Title:||Numerical analysis of transient elastohydrodynamic lubrication during startup and shutdown processes||Authors:||Lu, Xiqun
Mixed Elastohydrodynamic Lubrication (EHL)
DRNTU::Engineering::Mechanical engineering::Mechanics and dynamics
|Issue Date:||2018||Source:||Lu, X., Dong, Q., Zhou, K., Zhao, B., & Zhao, B. (2018). Numerical analysis of transient elastohydrodynamic lubrication during startup and shutdown processes. Journal of Tribology, 140(4), 041504-. doi:10.1115/1.4039371||Series/Report no.:||Journal of Tribology||Abstract:||In this study, a numerical model is developed for the analysis of elastohydrodynamic lubrication (EHL) at transient conditions during startup and shutdown processes. The time-dependent solutions are derived from an iterative algorithm with surface roughness involved, and the initial value is specified as the solution of the dry contact for the startup or steady-state solution of the lubrication contact at the starting velocity for the shutdown. The technique of discrete convolution and fast Fourier transform (DC-FFT) is employed to improve the computational efficiency. Solutions for smooth surfaces are compared with those obtained numerically and experimentally, and good consistency can be found. Profiles of pressure and film thickness and contours of subsurface stresses are analyzed to reveal the effects of acceleration/deceleration on the lubrication evolution. An isotropic roughness is then taken into account for the analysis. It is concluded that the coupling effects of the lubricant cavitation and oriented roughness would result in complex profiles of pressure and film thickness due to their disturbances to the lubrication film. A machined rough surface is presented to demonstrate the generality of the model. The analysis may potentially provide guidance to estimate the behavior of mechanical elements.||URI:||https://hdl.handle.net/10356/89901
|ISSN:||0742-4787||DOI:||10.1115/1.4039371||Rights:||© 2018 ASME. All rights reserved.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||MAE Journal Articles|
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.