A preliminary study of a surface wave-acoustical normal mode resonance in a fluid-filled rectangular waveguide with pressure-release boundaries
Davis, Norman Ewing
Kenyon, Morton William
Coppens, Alan B.
Sanders, James V.
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Studies of the effects of sinusoidal surface waves on the propagation of sound in a waveguide reveal a significant resonance effect under certain "matching" conditions of the wavelength of the surface wave and the wavelength of the acoustical sound field. An acoustic waveguide with constant cross-section and pressure release boundaries was designed with a termination to minimize reflection of both surface and acoustic waves so that traveling surface wave and traveling acoustic waves could be generated simultaneously. With acoustic and surface waves present, the existence of predicted resonances was verified and a strong resonance was examined for comparison with theory. The predicted effects have been qualitatively and quantitatively supported.
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