The variations in diesel engine idle vibration caused by fuels of diffierent 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 diffierent 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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Analysis of variations in diesel engine idle vibration


    Contributors:
    Ajovalasit, M (author) / Giacomin, J (author)


    Publication date :

    2003-10-01


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Analysis of variations in diesel engine idle vibration

    Ajovalasit,M. / Ciacomin,J. / Univ.of Sheffield,GB | Automotive engineering | 2003


    Analysis of variations in diesel engine idle vibration

    Ajovalasit, M. | Online Contents | 2003


    Human perception of diesel engine idle vibration

    Giacomin,J. / Ajovalasit,M. / Univ.of Sheffield,GB | Automotive engineering | 2004