223 振動はりの近接音場における音圧分布の解析と測定(オーガナイズドセッション : O.S.2 音響・振動による診断技術II)

概要

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The sound pressure distribution in the near field of fixed-fixed beams of rectangular cross section in resonance is numerically analyzed by modeling the beam as a baffled beam. It is shown that the distribution has a different pattern depending on the order of the vibration mode. The numerical results of the sound pressure against the distance from the beam are evaluated. As a result, it is shown that the sound pressure level (SPL) normalized by the SPL very close to the beam becomes lower in the higher vibration mode. The reason why that level becomes lower is that the beam of the higher mode has many loops and the sound radiated from convex parts and concave parts cancel each other. In the experiments, the theoretical results of sound pressure were in good agreement with the experimental results.
社団法人日本機械学会の論文
2001-06-05