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Publications in Scientific Journals:

D. Bianchi, E. Mayrhofer, M. Gröschl, G. Betz, A. Vernes:
"Wavelet packet transform for detection of single events in acoustic emission signals";
Mechanical Systems and Signal Processing, 64-65 (2015), 441 - 451.



English abstract:
Acoustic emissionsignalsintribologycanbeusedformonitoringthestateofbodiesin
contact andrelativemotion.Therecordedsignalincludesinformationwhichcanbe
associatedwithdifferentevents,suchastheformationandpropagationofcracks,
appearanceofscratchesandsoon.Oneofthemajorchallengesinanalyzingthese
acousticemissionsignalsistoidentifypartsofthesignalwhichbelongtosuchanevent
and discernitfromnoise.Inthiscontribution,awaveletpacketdecompositionwithinthe
frameworkofmultiresolutionanalysistheoryisconsideredtoanalyzeacousticemission
signalstoinvestigatethefailureoftribologicalsystems.Byapplyingthewaveletpacket
transform amethodfortheextractionofsingleeventsinrailcontactfatiguetestis
proposed. Theextractionofsucheventsatseveralstagesofthetestpermitsaclassifica-
tion andtheanalysisoftheevolutionofcracksintherail.

Keywords:
Event detection Waveletpackettransform Acoustic emission Rollingcontactfatigue Rail-wheel contact

Created from the Publication Database of the Vienna University of Technology.