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Statements

Subject Item
n2:RIV%2F61388998%3A_____%2F14%3A00438511%21RIV15-MPO-61388998
rdf:type
skos:Concept n9:Vysledek
dcterms:description
Acoustic Emission (AE) analyzers for the purpose of structural health or condition monitoring should provide longtime continuous signal records with relatively high sampling frequency. Recorded huge data must be analyzed to disclose any faults in monitored processes or structures like e.g. leakages in pressure vessels or defects in rotating machines and gearboxes, etc. Fast and reliable AE signal processing and analyzing methods are required. In this paper we present such analysis of continuous AE recorded during tests of renovated helicopter gearboxes. Four-channel continuous AE recording system with 4 MHz sampling rate was used in the tests performed under variable 'flight' simulation regimes. As an alternative to classical spectrogram analysis, we proposed to use histograms of time intervals between crossings of threshold amplitudes (multilevel counting) in the wavelet decomposition details. Results obtained on long-time records are discussed. Acoustic Emission (AE) analyzers for the purpose of structural health or condition monitoring should provide longtime continuous signal records with relatively high sampling frequency. Recorded huge data must be analyzed to disclose any faults in monitored processes or structures like e.g. leakages in pressure vessels or defects in rotating machines and gearboxes, etc. Fast and reliable AE signal processing and analyzing methods are required. In this paper we present such analysis of continuous AE recorded during tests of renovated helicopter gearboxes. Four-channel continuous AE recording system with 4 MHz sampling rate was used in the tests performed under variable 'flight' simulation regimes. As an alternative to classical spectrogram analysis, we proposed to use histograms of time intervals between crossings of threshold amplitudes (multilevel counting) in the wavelet decomposition details. Results obtained on long-time records are discussed.
dcterms:title
Multilevel Analysis of Continuous AE from Helicopter Gearbox Multilevel Analysis of Continuous AE from Helicopter Gearbox
skos:prefLabel
Multilevel Analysis of Continuous AE from Helicopter Gearbox Multilevel Analysis of Continuous AE from Helicopter Gearbox
skos:notation
RIV/61388998:_____/14:00438511!RIV15-MPO-61388998
n3:aktivita
n16:P n16:I
n3:aktivity
I, P(FR-TI3/755)
n3:cisloPeriodika
12
n3:dodaniDat
n14:2015
n3:domaciTvurceVysledku
n10:2650290 n10:3302849 n10:6309011 n10:8402469
n3:druhVysledku
n17:J
n3:duvernostUdaju
n5:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
31029
n3:idVysledku
RIV/61388998:_____/14:00438511
n3:jazykVysledku
n15:eng
n3:klicovaSlova
structural health monitoring (SHM); signal processing; acoustic emission (AE); diagnostics of helicopter gearbox; wavelet analysis; continuous acoustic emission
n3:klicoveSlovo
n6:wavelet%20analysis n6:structural%20health%20monitoring%20%28SHM%29 n6:diagnostics%20of%20helicopter%20gearbox n6:acoustic%20emission%20%28AE%29 n6:continuous%20acoustic%20emission n6:signal%20processing
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[C03F77A3078E]
n3:nazevZdroje
The e-Journal of Nondestructive Testing
n3:obor
n12:JU
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
4
n3:projekt
n4:FR-TI3%2F755
n3:rokUplatneniVysledku
n14:2014
n3:svazekPeriodika
19
n3:tvurceVysledku
Chlada, Milan Heřmánek, Jan Krofta, Josef Převorovský, Zdeněk
s:issn
1435-4934
s:numberOfPages
10