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Multilevel Analysis of Continuous AE from Helicopter Gearbox
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SYSNO ASEP 0438511 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Multilevel Analysis of Continuous AE from Helicopter Gearbox Author(s) Chlada, Milan (UT-L) RID, ORCID
Převorovský, Zdeněk (UT-L) RID, ORCID
Heřmánek, Jan (UT-L)
Krofta, Josef (UT-L) RID, ORCIDNumber of authors 4 Source Title E-Journal of Nondestructive Testing & Ultrasonics - ISSN 1435-4934
Roč. 19, č. 12 (2014)Number of pages 10 s. Publication form Online - E Action European Conference on Non-Destructive Testing (ECNDT 2014) /11./ Event date 06.10.2014-10.10.2014 VEvent location Praha Country CZ - Czech Republic Event type WRD Language eng - English Country DE - Germany Keywords structural health monitoring (SHM) ; signal processing ; acoustic emission (AE) ; diagnostics of helicopter gearbox ; wavelet analysis ; continuous acoustic emission Subject RIV JU - Aeronautics, Aerodynamics, Aircrafts R&D Projects FR-TI3/755 GA MPO - Ministry of Industry and Trade (MPO) Institutional support UT-L - RVO:61388998 Annotation 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. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2015
Number of the records: 1