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Title: Analysis of variations in diesel engine idle vibration
Authors: Giacomin, J
Ajovalasit, M
Keywords: Diesel;Fuel;Idle vibration;Steering wheel;Human perception;Wavelet analysis
Issue Date: 2003
Publisher: Professional Engineering
Citation: Proceedings of the IMechE, Part D - Journal of Automobile Engineering. 217(10): 921-933
Abstract: The variations in diesel engine idle vibration caused by fuels of different composition and their contributions to the variations in the steering wheel vibrations were assessed. The time-varying covariance method (TV-AutoCov) and time-frequency continuous wavelet transform (CWT) techniques were used to obtain the cyclic and instantaneous characteristics of the vibration data acquired from two turbocharged four-cylinder, 4-stroke diesel engine vehicles at idle under twelve different fuel conditions. The analysis revealed that TV-AutoCov analysis was the most effective for detecting changes in cycle-to-cycle combustion energy (22.61%) whereas changes in the instantaneous values of the combustion peaks were best measured using the CWT method (2.47%). On the other hand both methods showed that diesel idle vibration was more affected by amplitude modulation (12.54%) than frequency modulation (4.46%). The results of this work suggest the use of amplitude modulated signals for studying the human subjective response to diesel idle vibration at the steering wheel in passenger cars.
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Appears in Collections:Design
Dept of Design Research Papers

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