Source Location of Acoustic Emission Based on First Motion of Waveform

Over the past few decades, acoustic emission (AE) has been widely used for structural health monitoring (SHM) of steel bridges. AE demonstrated several advantages over other monitoring methods, such as high sensitivity and ability to locate the source of damage. Source localization is an important part of any SHM. First threshold crossing (FTC) method is a common way of determining the source location of AE events. Several sensors are placed in the structure and the original location of the source is identified by comparing FTC times of the waveforms at the sensors. FTC method is completely dependent on the instrumental threshold. The emphasis on the paper is to develop a reliable source location technique based on the first motion of the AE waves. Experimental results shows AE waves may be affected by the dimensions, and shape of the specimen, which affect triggering the FTC times and subsequently source location of events. First motion technique can be employed to improve the source location plots of AE events.

References
1. Sohn, H., et al., A review of structural health monitoring literature, 1996-2200, Los Alamos National Laboratory, 2003. 2. Hossain, M., P. Ziehl, J. Yu, J. Caicedo and F. Matta, “Source Mechanisms of Acoustic Emission during Fatigue Crack Growth in Steel Bridge Material,” Proc. 5th European Conference on Structural Control (EACS 2012), June 18-20, 2012, Genoa, Italy, 2012: paper#158, 7 p., 2012a. 3. Hossain, M., J. Yu, P. Ziehl, J. Caicedo, F. Matta, S. Guo and M.A. Sutton, “Acoustic Emission Source Mechanisms for Steel Bridge Material,” in Review of Progress in QNDE, 32B, AIP Conference Proceedings Vol. 1511, American Institute of Physics, Melville, NY (2013), pp. 1378-1385, 2012b.
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