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The Use of Morlet Wavelet Coefficients for Identifying Fatigue Damage Features

S. Abdullah, T. E. Putra, M. Z. Nuawi and Z. M. Nopiah

Pertanika Journal of Tropical Agricultural Science, Volume 19, Issue S, October 2011

Keywords: Fatigue strain signal, Morlet wavelet coefficient, fatigue damage

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This paper presents a new approach to identify fatigue damaging potential locations using the Morlet wavelet coefficients. For solving the subject matter, the 122.4 second SAESUS strain signal was selected for the simulation purpose. As the result, the Morlet wavelet coefficients predicted that the maximum fatigue damage occurs at 40.4 - 42.6 seconds and 67.4 - 70 seconds. For the validation purpose, the Morrow's fatigue damaging value was calculated and was obtained that the maximum fatigue damage occurs at 0 seconds and 99.7 seconds. The fatigue damaging value at the points was 0.0047 cycles to failure. Since both the plots had similar pattern, the Morlet wavelet coefficients could be used as the early warning of the fatigue damaging potential locations, although the locations were not entirely correct.

ISSN 1511-3701

e-ISSN 2231-8542

Article ID

JST-0331-2011

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