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Communication Dans Un Congrès Année : 2022

Estimation of Reverberation Time in Solids

Résumé

Ultrasonic testing is one of many techniques used to evaluate materials and detect defects of media. Indeed, classical ultrasonic testing methods depend on wave propagation along direct path between emitter and receiver, which provides local information. Other techniques provide global information using coda. In this work, a method is proposed based on the reverberated signals, providing global information about medium properties. Moreover, the coda is sensitive to small changes in boundary conditions. Sabine established a relationship between reverberation time and wall attenuation coefficient in case of fluid reverberating medium, more especially in air. These reverberated signals are generally averaged in an acoustic room using the Schröder integration method, which allows the reverberation time to be measured and to estimate the wall attenuation. This method only works for one mode of propagation while in solid medium, two-mode of propagation occurs. By considering that the acoustic room is analogous to solid media, the discrete attenuation of the walls can be equivalent to the boundary conditions of the solid medium interface. This feature can allow the estimation of the mechanical parameters of surrounding fluids such as celerity, density, and viscosity. In this study, an analytical model is provided to estimate the acoustic intensity for two-mode of propagation in aluminum mold surrounded by air, taking into account mode conversion. Then, the reverberation time of the simulated signals is estimated using Schröder integral and compared with experimental measurements. The experimental setup is composed of five piezoelectric patches (PZT), which are randomly distributed around the aluminum mold. One as an emitter, and the others as receivers. Our analytical results are in good agreement between numerical and experimental reverberation time. As a perspective, this work will be extended to other fluids and to multilayer systems to estimate the mechanical parameters of fluids.
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Dates et versions

hal-03847931 , version 1 (10-11-2022)

Identifiants

  • HAL Id : hal-03847931 , version 1

Citer

Youssef Farhat, Julien Bustillo, Hossep Achdjian, Marie Nawal Sabra, Doumit Zaouk, et al.. Estimation of Reverberation Time in Solids. 16ème Congrès Français d'Acoustique, CFA2022, Société Française d'Acoustique; Laboratoire de Mécanique et d'Acoustique, Apr 2022, Marseille, France. ⟨hal-03847931⟩
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