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.
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July 2018
Research-Article
Numerical Analysis of Transient Elastohydrodynamic Lubrication During Startup and Shutdown Processes
Xiqun Lu,
Xiqun Lu
College of Power and Energy Engineering,
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
Search for other works by this author on:
Qingbing Dong,
Qingbing Dong
College of Power and Energy Engineering,
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
e-mail: dongqingbing@hrbeu.edu.cn
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
e-mail: dongqingbing@hrbeu.edu.cn
Search for other works by this author on:
Kun Zhou,
Kun Zhou
School of Mechanical and
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
Search for other works by this author on:
Bin Zhao,
Bin Zhao
College of Power and Energy Engineering,
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
Search for other works by this author on:
Bo Zhao
Bo Zhao
School of Mechanical and
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
Search for other works by this author on:
Xiqun Lu
College of Power and Energy Engineering,
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
Qingbing Dong
College of Power and Energy Engineering,
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
e-mail: dongqingbing@hrbeu.edu.cn
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
e-mail: dongqingbing@hrbeu.edu.cn
Kun Zhou
School of Mechanical and
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
Bin Zhao
College of Power and Energy Engineering,
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
Harbin Engineering University,
145 Nantong Street,
Nangang District,
Harbin 150001, Heilongjiang, China
Bo Zhao
School of Mechanical and
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 15, 2017; final manuscript received January 24, 2018; published online March 30, 2018. Assoc. Editor: Liming Chang.
J. Tribol. Jul 2018, 140(4): 041504 (14 pages)
Published Online: March 30, 2018
Article history
Received:
October 15, 2017
Revised:
January 24, 2018
Citation
Lu, X., Dong, Q., Zhou, K., Zhao, B., and Zhao, B. (March 30, 2018). "Numerical Analysis of Transient Elastohydrodynamic Lubrication During Startup and Shutdown Processes." ASME. J. Tribol. July 2018; 140(4): 041504. https://doi.org/10.1115/1.4039371
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