Location of two simultaneously active continuous acoustic emission sources on an aluminum beam

Authors: Kosel T.; Grabec I.

Source: Aircraft Engineering and Aerospace Technology: An International Journal, Volume 74, Number 1, 2002 , pp. 4-8(5)

Publisher: Emerald Group Publishing Limited

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Abstract:

Acoustic emission analysis (AE) is used for characterization and location of developing defects in materials. AE sources often generate a mixture of various statistically independent signals. One difficult problem of AE analysis is the separation and characterization of signal components when the signals from various sources and the way in which the signals were mixed are unknown. Recently, blind source separation (BSS) by independent component analysis (ICA) has been used to solve these problems. The main purpose of this paper is to demonstrate the applicability of ICA to time-delay estimation of two independent continuous AE sources on an aluminum beam. It is shown that it is possible to estimate time delays by ICA, and thus to locate two independent simultaneously emitted sources.

Keywords: Aluminum; Defects; Fault Analysis

Document Type: Research article

DOI: http://dx.doi.org/10.1108/00022660210414967

Publication date: 2002-02-01