Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/89901
Title: Numerical analysis of transient elastohydrodynamic lubrication during startup and shutdown processes
Authors: Lu, Xiqun
Dong, Qingbing
Zhou, Kun
Zhao, Bin
Zhao, Bo
Keywords: Transient Analysis
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
http://hdl.handle.net/10220/47780
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

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