The influence of cylinder lubrication on piston slap
Gerges, S.N.Y., De Luca, J.C. and Lalor, N. (2002) The influence of cylinder lubrication on piston slap. Journal of Sound and Vibration, 257, (3), 527-557. (doi:10.1006/jsvi.2002.5051).
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A model has been developed for determining the time history of piston slap impact force. This model takes into account the influence of the oil film on the impact behaviour, which was found to be an important factor. However, it was also found that entrapped gas bubbles in the oil are equally significant. Three test rigs were designed and built to study these effects on the impact phenomenon and extensive tests were carried out. The impact force time history has been determined using Reynolds' theory. Results have shown that Reynolds' theory for fluid film squeezing can be applied for oil film damping determination. However, the experimental results have also shown that when gas is entrapped during the impact, this theory considerably overpredicts the magnitude of the impact. An eight-degree-of-freedom lumped parameter model was developed through the dynamic analysis of each component of an internal combustion engine's reciprocating system. The effective damping factor derived from this model was found to be inversely proportional to the oil film thickness cubed, as expected from Reynolds' theory. A dynamic model has been proposed, where the oil film mixed with bubbles is considered to be analogous to a serial spring and damping system. By incorporating a spring in series with this damper, the effect of the bubbles can also be predicted.
|Subjects:||Q Science > QC Physics|
|Divisions:||University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Dynamics
|Date Deposited:||18 Jan 2005|
|Last Modified:||01 Jun 2011 06:01|
|Contributors:||Gerges, S.N.Y. (Author)
De Luca, J.C. (Author)
Lalor, N. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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