段付き管内音圧分布の数値計算と実験

概要

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This paper describes on numerical calculation and its experimental result of sound field in the stepped tube having finite length with discontinuous reduction or expansion along the radial axis which has been widely used in the acoustic devices. In general, the one dimensional model analogy is easier to investigate a sound pressure distribution along the axis in a tube, however it came out a phase shift between predicted plane wave and experimental one when the node of sound pressure is located at the junction. So, investigation based on the rigorous wave theory is made by including higher order mode in addition to the plane wave in the tube. The sound pressure distributions along the axis and the radial direction in the tube are investigated. In the above mentioned case, it is shown than the effects of higher order mode can not be neglected even in the frequency range lower that first cut off frequency of radial modes.
社団法人日本音響学会の論文
1983-10-01