A Simplified Model to Study EHL Film Collapse During Rapid Halting Motion

A theoretical model for describing the EHL film thickness during rapid deceleration is presented. The theory is based on the pioneer work of Ertel (1939) and Grubin (1949), who gave the first analytical solution for the elastohydrodynamic lubrication of a line contact under stationary operating cond...

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Bibliographic Details
Published inTribology transactions Vol. 45; no. 4; pp. 512 - 520
Main Authors NELIAS, D, TRUJILLO JIMENEZ, A
Format Journal Article Conference Proceeding
LanguageEnglish
Published Colchester Taylor & Francis Group 01.01.2002
Taylor & Francis
Taylor & Francis Inc
Subjects
Aerospace Tribology
Applied sciences
Bearings, bushings, rolling bearings
Drives
Elastohydrodynamic Lubrication
Engineering Analysis and Computing
Exact sciences and technology
Friction, wear, lubrication
Machine components
Mechanical engineering. Machine design
Rolling Element Bearings
Collapse
Lubricating film
Line contact
Transient response
Shutdown
Aerospace
Modeling
Rolling bearing
Contact line
Elastohydrodynamic lubrication
Tribology
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Summary:A theoretical model for describing the EHL film thickness during rapid deceleration is presented. The theory is based on the pioneer work of Ertel (1939) and Grubin (1949), who gave the first analytical solution for the elastohydrodynamic lubrication of a line contact under stationary operating conditions. An extension is made here for rapid halting motion. The proposed model is well adapted when the halting period is small in comparison to the transit time (i.e. 2b/u, ratio between the contact width and the rolling speed). This work completes the model of Glovnea and Spikes (2001b), appropriate for slow halting motion but which suffers from experimental fitting, and the model of Chang (2000) that is more suitable for speed or load oscillations at a wavelength close to the transit time. This behavior implies that stop-start, reciprocating or rapidly halting machine components may be able to maintain a separating film for longer than would be expected based on steady-state EHL theory. An application to a ball bearing arrangement in a space mechanism is finally made in order to assess the model capabilities. Presented at the 57th Annual Meeting in Houston, Texas May 19-23, 2002
ISSN:1040-2004
1547-397X
DOI:10.1080/10402000208982582