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Appl. Sci. 2018, 8(1), 7; doi:10.3390/app8010007

A Method to Decompose the Streamed Acoustic Emission Signals for Detecting Embedded Fatigue Crack Signals

1
Civil and Materials Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
2
Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
3
NAVAIR NAS Patuxent River, St. Mary’s County, MD 20670, USA
*
Author to whom correspondence should be addressed.
Received: 12 November 2017 / Revised: 13 December 2017 / Accepted: 19 December 2017 / Published: 22 December 2017
(This article belongs to the Section Acoustics)
View Full-Text   |   Download PDF [5953 KB, uploaded 22 December 2017]   |  

Abstract

The data collection of Acoustic Emission (AE) method is typically based on threshold-dependent approach, where the AE system acquires data when the output of AE sensor is above the pre-defined threshold. However, this approach fails to detect flaws in noisy environment, as the signal level of noise may overcome the signal level of AE from flaws, and saturate the AE system. Time-dependent approach is based on streaming waveforms and extracting features at every pre-defined time interval. It is hypothesized that the relevant AE signals representing active flaws are embedded into the streamed signals. In this study, a decomposition method of the streamed AE signals to separate noise signal and crack signal is demonstrated. The AE signals representing fatigue crack growth in steel are obtained from the laboratory scale testing. The streamed AE signals in a noisy operational condition are obtained from the gearbox testing at the Naval Air Systems Command (NAVAIR) facility. The signal addition and decomposition is achieved to determine the minimum detectable signal to noise ratio that is embedded into the streamed AE signals. The developed decomposition approach is demonstrated on detecting burst signals embedded into the streamed signals recorded in the spline testing of the helicopter gearbox test rig located at the NAVAIR facility. View Full-Text
Keywords: Acoustic Emission (AE); streamed signals; laboratory scale testing; gearbox spline Acoustic Emission (AE); streamed signals; laboratory scale testing; gearbox spline
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, L.; Ozevin, D.; He, D.; Hardman, W.; Timmons, A. A Method to Decompose the Streamed Acoustic Emission Signals for Detecting Embedded Fatigue Crack Signals. Appl. Sci. 2018, 8, 7.

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