Study on Acoustic Emission Localization of Concrete Using Modified Velocity

Abstract

To improve the accuracy of the acoustic emission (AE) source localization, a new 3D AE source localization method was investigatedwhichusedacombinationofthemodifiedvelocityandthe3Dlocalizationalgorithmbasedontheexhaustivemethod. ThewavespeedhasasignificanteffectontheAElocationresults.Withtheincreaseofdistance,theAEsignalseriouslyattenuated due to the anisotropy of concrete, and the measured velocity changed for various distances. The velocity-distance curves were obtained when employing different water-cement ratios (W/C) and aggregate sizes. However, the current AE location system adopted constant wave velocity. As a result, the error was tremendous. The accuracy of the localization before and after the modifiedvelocitywascompared.The3Dlocalizationresultsshowedthatcomparedwiththeconstantwavevelocity,theposition deviation of the modified velocity was smaller and the localization results with the modified velocity were more accurate.