単純支持の有限円筒に任意の音波が入射したときの散乱

概要

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Acoustic scattering of an arbitrary wave incident on a finite submerged cylindrical shell is studied theoretically and experimentally, where the term arbitrary wave is referred to non-plane, non-spherical wave-front emanating from an actual transducer driven by a single frequency. An analytical solution for the spherical wave incidence is extended by introducing the concepts of "insonified window" and "shape parameter. " A simply-supported cylindrical shell for the experiment may be modeled as an infinite shell whose insonified length is restricted by the insonified window. The shape parameter defines the difference in the shape of wave-front between the spherical wave and the wave from an actual transducer. The measurement of scattering on a simply-supported, water-filled shell is carried out using Scattering Generalized Near-field Acoustical Holography (SGENAH). The validity of our approximate theory is confirmed by good agreement between theoretical and experimental results.
社団法人日本音響学会の論文