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3D acoustic scattering from an irregular fluid waveguide via the BEM. (English) Zbl 0982.76067
Summary: We use the BEM to calculate the variation in the pressure field generated by a dilatational point load inside a channel filled with a homogeneous fluid, in the presence of an irregular floor. The Green’s functions are defined in the frequency domain and obtained by superposing virtual acoustic sources combined so as to generate the boundary conditions on free rigid surfaces of the channel. The responses in time domain are obtained by means of Fourier transforms, making use of complex frequencies. The main features and spectral representation of the signals scattered by irregular floors are then described and used to elucidate the most important aspect of wave acoustics, which can provide the basis for the development of non-destructive testing and imaging methods.

MSC:
76M15 Boundary element methods applied to problems in fluid mechanics
76Q05 Hydro- and aero-acoustics
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