Original title: Multilevel Analysis of Continuous Acoustic Emission Records
Authors: Chlada, Milan ; Převorovský, Zdeněk
Document type: Papers
Conference/Event: SPMS 2013, Nebřich (CZ), 2013-06-24 / 2013-06-29
Year: 2013
Language: eng
Abstract: The latest acoustic emission (AE) systems provide continuous recording of high-frequency signals registered during longtime monitoring of various processes in materials. Recorded data represent extremely large amount of information to analyze, however, it reflects the health of the structure. Therefore, in the last years the attention is paid to the diagnostic method of continuous AE also as a part of Structural Health Monitoring (SHM) systems. For example it can disclose the early damage phases (cracks) or certain imperfections in rotating gearboxes, the leakage of liquids from pressure vessels and many other material defects. This method requires new signal processing and analysis approaches, which are different from the burst AE. The paper deals with the analysis of continuous AE, recorded during the test of renovated gearbox at different flight modes. As an alternative to classical spectrogram, so-called multilevel countogram based on the signal wavelet decomposition is proposed and discussed.
Keywords: continuous acoustic emission; countogram; helicopter gearbox diagnostics; wavelet analysis
Project no.: FR-TI3/755 (CEP)
Funding provider: GA MPO
Host item entry: Stochastic and Physical Monitoring Systems 2013, ISBN 978-80-01-05383-6

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0228795

Permalink: http://www.nusl.cz/ntk/nusl-170072


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