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Title: Analysis of variations in diesel engine idle vibration
Authors: Ajovalasit, M
Giacomin, J
Keywords: Diesel;Fuel;Idle vibration;Steering wheel;Human perception;Wavelet analysis
Issue Date: 2003
Publisher: Sage Journals
Citation: Proceedings of the Institution of Mechanical Engineers Part D-Journal of Automobile Engineering 217(10), 921 - 933, 2003
Abstract: The variations in diesel engine idle vibration caused by fuels of different composition and their contributions to the variations in 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, four-stroke diesel engine vehicles at idle under 12 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 per cent), whereas changes in the instantaneous Values of the combustion peaks were best measured using the CWT method (2.47 per cent). On the other hand, both methods showed that diesel idle vibration was more affected by amplitude modulation ( 12.54 per cent) than frequency modulation (4.46 per cent). 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.
ISSN: 0954-4070
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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