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Algorithm Development and Experimental Verification of Acoustic Emission First-arrival-time Determination for the Source Location
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  • Journal title : The Journal of Engineering Geology
  • Volume 25, Issue 4,  2015, pp.587-598
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2015.4.587
 Title & Authors
Algorithm Development and Experimental Verification of Acoustic Emission First-arrival-time Determination for the Source Location
Jang, Hyun-Sic; Choi, Jun-Young; Jang, Bo-An;
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 Abstract
We examined various existing threshold methods for the determination of the first arrival time of acoustic emission (AE), and developed a new variable threshold method that could determine the first arrival time of AE more accurately and more quickly than existing methods. The new method, a modification of an existing threshold method, does not fix the threshold, but applies variable thresholds for the AE signals according to noise analysis. Two- and three-dimensional models were established to test the effectiveness of the new method. It could determine source locations of AE in a two-dimensional model 38.3% more accurately than the pre-existing threshold methods. Its accuracy improvement over the existing methods in a three-dimensional model was about 15.2%. A practical test involved measuring the source locations of AE during three-point bending tests of granite cores. The new method placed the sources closer to the fracture plane than did the pre-existing methods, indicating its superior (and quicker) ability to determine the source locations of AE.
 Keywords
acoustic emission (AE);first arrival time;variable threshold method;verification test;
 Language
Korean
 Cited by
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