Physics-based classification of acoustic emission waveforms

Duwarahan Rajendra; Travis Knighton; Albert Esterline; Mannur J. Sundaresan

doi:10.1117/12.880668

19 April 2011 Physics-based classification of acoustic emission waveforms

Duwarahan Rajendra, Travis Knighton, Albert Esterline, Mannur J. Sundaresan

Proceedings Volume 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011; 79833H (2011) https://doi.org/10.1117/12.880668
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

The classification of acoustic emission source mechanisms based on features related to the physics of acoustic emission signal generation is considered in this paper. Numerically generated acoustic emission waveforms are used for this purpose. Conventional acoustic emission parameters such as rise-time, duration, and frequency content do not effectively characterize acoustic emission waveforms for the purpose of identifying the source mechanisms. Features unique to the different source mechanisms and relative positions of the sensor with respect to the source were identified and extracted from numerically obtained acoustic emission waveforms. This feature selection appears to be successful in capturing the differences related to the source mechanisms considered here. Correlation coefficients of the 45 features with different waveforms were first obtained, and their principal components determined. The dominant principle components were found to adequately characterize the waveforms and relate them to their source mechanisms. Better than 90 percent success was seen when only the first two principle components were employed, even in noisy signals considered here.

Citation Download Citation

Duwarahan Rajendra, Travis Knighton, Albert Esterline, and Mannur J. Sundaresan "Physics-based classification of acoustic emission waveforms", Proc. SPIE 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, 79833H (19 April 2011); https://doi.org/10.1117/12.880668

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