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Assessment of the Removal of the Crankshaft Balance Weights on Bearing Caps Vibration and Engine Noise
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English
Abstract
The paper quantifies the vibrational acceleration of the main bearings and engine noise of an 8.2 Litre, six-cylinder, turbocharged diesel engine before and after the removal of the crankshaft balance weights and reviews their properties in both time and frequency domains. The change in the axial vibration of the middle bearing and the corresponding change in the emitted engine noise measured at the RHS (right hand side) of the engine are correlated. A similar correlation is observerd between the change in the axial vibration of the frontal bearing and the corresponding change in the emitted engine noise measured at the engine front.
It is shown that the removal of the balance weights has not resulted any consistent increase of the emitted noise level, in fact at some running conditions the noise level is lower.
The removal of the balance weights tends to reduce the mid and high frequency level of axial vibration.
The increase in amplitude of the second harmonic of the bearing loads at the higher engine speeds could give rise to a deterioration in fatique life of the crankshaft and bearings.
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Citation
Ghazy, M., "Assessment of the Removal of the Crankshaft Balance Weights on Bearing Caps Vibration and Engine Noise," SAE Technical Paper 911058, 1991, https://doi.org/10.4271/911058.Also In
References
- ANDERTON, D. “Combustion as a Source of Diesel Engine Noise” University of Southampton England 1986
- GHAZY, M.R. PRIEDE, T. “Characteristics of Exciting Forces and Structure Response of Turbocharged Diesel Engines” SAE paper 850972 1985
- PRIEDE, T. “In Search of Origins of Engine Noise-an Historical Review” SAE paper 800534 1980