Abstract
The accurate localization of an acoustic emission (AE) source is a vital aspect of AE nondestructive testing technology. A model of wave velocity attenuation caused by the extension of transmission distance is established to analyze the attenuation of AE wave velocities in concrete and thus improve the acoustic source localization accuracy from the perspective of modified velocity. In combination with the exhaustive and region localization methods, a region exhaustive localization method is established based on the modified wave velocity. The results indicate that the smaller the water–cement ratio, the larger the reference wave velocity, and the spatially dependent attenuation of wave velocity increase. Moreover, the larger the aggregate particle size, the larger the reference wave velocity, and the greater the attenuation of wave velocity with distance. For a propagation distance of 1000 mm, the AE wave velocity attenuation exceeds 50% compared with the AE velocity. The optimized localization method reduces the number of nodes calculated, thus improving the method’s accuracy when used for localization.
Highlights
Acoustic emission (AE) is a dynamic nondestructive testing method used to monitor structural status [1]
Zhou [2] identified the fatigue crack AE signal of railway vehicle axle from the residuals obtained from intrinsic mode functions and empirical mode decomposition
When AE technology is used to detect and locate the damage in cement concrete structures, the accuracy of the AE source location can be improved by defining the attenuation law of sound in cement concrete, the attenuation law of wave velocity
Summary
Acoustic emission (AE) is a dynamic nondestructive testing method used to monitor structural status [1]. By analyzing the AE signal, the location and the properties of the AE source, the stress history of the material, and the degree of material damage can be determined. Kundu [12] reviewed the existing novel acoustic source localization technologies, compared the available techniques, determined the source localization technique that would be most effective for specific structure types, and defined the current research needs. In the research on the AE source localization of concrete materials, studies and applications of the triangulation and beamforming technologies with known wave velocity are relatively mature. When AE technology is used to detect and locate the damage in cement concrete structures, the accuracy of the AE source location can be improved by defining the attenuation law of sound in cement concrete, the attenuation law of wave velocity. The results show that the new algorithm can improve the localization accuracy and reduce the amount of calculation
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