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Vol.25, No.3, 2025, pp. 361–366 |
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IDENTIFYING DAMAGED PART IN CONCRETE SPECIMEN USING ACTUAL ARRIVAL TIME ERRORS OF USING WEIGHTED POTENTIAL TIME IN ACOUSTIC EMISSION TOMOGRAPHY Mikika Furukawa*,
Katsuya Nakamura
Department of Civil Engineering, College of Science and Technology, Nihon University, Tokyo, JAPAN *email: Furukawa.mikika@nihon-u.ac.jp , K. Nakamura https://orcid.org/0009-0003-5213-9901
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Abstract In previous study, we generated 100 observation error patterns that used different observation error ratio via truncated normal distribution to recreate arrival times with observation errors to verify Acoustic Emission Tomography (AET) considering the potential excitation time weight. The results show that the consideration of potential excitation time weight is effective in identifying elastic wave velocity distribution. However, the verification is conducted on the basis of numerical investigations and has not been validated experimentally. Thus, in this study, we use actually observed arrival times that are excited by pencil lead break on a concrete specimen as input values for the validation of the proposed method. In the validation, we aim to identify an elastic wave velocity distribution in which damaged part in a concrete specimen is clearly recognisable. Results show that AET with potential excitation time weight successfully detects the existence of the hole in the concrete specimen in comparison with conventional AET, and it demonstrates that AET with potential excitation time weight improves the accuracy of the identified elastic wave velocity distribution in an experimental manner, and so do the results from numerical investigations. Additionally, although conventional AET identifies the sound area as the most damaged area, AET with the weight determines the location of the hole as the most damaged area. Keywords: • elastic wave velocity distribution • acoustic emission tomography • system identification |
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