The influence of cylinder lubrication on piston slap
The influence of cylinder lubrication on piston slap
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.
527-557
Gerges, S.N.Y.
ad86ae05-bbac-438b-8ab3-9f8664d10b19
De Luca, J.C.
c3a1dcc8-2369-4d65-aa43-8a2db1372e3d
Lalor, N.
0b881dea-4975-4320-8eb0-9e0445f2091c
2002
Gerges, S.N.Y.
ad86ae05-bbac-438b-8ab3-9f8664d10b19
De Luca, J.C.
c3a1dcc8-2369-4d65-aa43-8a2db1372e3d
Lalor, N.
0b881dea-4975-4320-8eb0-9e0445f2091c
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), .
(doi:10.1006/jsvi.2002.5051).
Abstract
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.
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Published date: 2002
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Local EPrints ID: 10036
URI: http://eprints.soton.ac.uk/id/eprint/10036
ISSN: 0022-460X
PURE UUID: 017ac6c7-f730-42a2-bf45-e550fedee1e5
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Date deposited: 18 Jan 2005
Last modified: 15 Mar 2024 04:58
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Author:
S.N.Y. Gerges
Author:
J.C. De Luca
Author:
N. Lalor
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