Abstract
In order to study the attenuation characteristic of acoustic emission of the steel bifurcated pipe in hydropower station, the changing rules of acoustic emission signal waveforms with the increasing of propagation distance as well as the changes of the work surface are analyzed; considering the three main attenuation factors of the acoustic emission signal, a general expression of acoustic pressure in function of the propagation distance is proposed, which can be applied for different wave types of acoustic emission signals. Several fitting models of attenuation testing data are built, and a statistical parameter named adjusted coefficient of determination (adjusted COD or adjusted R-square) is used to evaluate the goodness of fit, and then the corresponding amplitude modification curves of the acoustic emission localization source are given. The user-defined nonlinear fitting model which is a combination of linear equation and logarithmic equation of amplitude-distance attenuation has the best fitting result. The results of the study can provide reference and guidance for similar projects.
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Wu, W., Cheng, S., Li, D., Cao, S., Lü, B. (2019). Study of Acoustic Emission Attenuation Characteristics of the Steel Bifurcated Pipe in Hydropower Station. In: Shen, G., Zhang, J., Wu, Z. (eds) Advances in Acoustic Emission Technology. WCAE 2017. Springer Proceedings in Physics, vol 218. Springer, Cham. https://doi.org/10.1007/978-3-030-12111-2_30
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DOI: https://doi.org/10.1007/978-3-030-12111-2_30
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