Looking for a vibrational measure of vehicle powertrain damage using multifractal analysis

Andrzej Puchalski1 , Iwona Komorska2

1, 2University of Technology and Humanities in Radom, Radom, Poland

1Corresponding author

Vibroengineering PROCEDIA, Vol. 3, 2014, p. 351-356.
Accepted 24 September 2014; published 10 October 2014

Copyright © 2014 JVE International Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract.

The paper proposes the Detrended Fluctuation Analysis (DFA) of the vibration signal for diagnosing of mechanical defects of the vehicle powertrain. The DFA allows investigations of the observed signals with regard to their multifractality. The results of vibration signal analysis of the engine with the damaged exhaust valve and with the unsuitable exhaust valve clearance are presented. During road test the acceleration vibration signal was recorded with additional signals for synchronization and engine timing. The vibration data are analysed by DFA and the resultant scaling-law curve with crossover points are obtained. The estimated Hurst exponents are used in the selection procedure of diagnostic features.

Keywords: combustion engine vibrations, defected valve system, detrended fluctuation analysis, Hurst exponent.

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