0707 コンパクトグリーン関数を用いた空力音の予測精度に関する考察(OS7-2 流れと音,オーガナイズドセッション)

概要

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In order to clarify the mechanism of aerodynamic noise generation, aerodynamic sound source was measured with a dynamic PIV system. The acoustic analysis that used the time series data of the vorticity field and the acoustic analysis that used Howe's vortex theory using by a compact Green's function were compared. The estimated sound spectrum is in good agreement with that of the fundamental frequency of the Karman vortex. However, at the higher frequency, the estimated sound levels are larger than that of the direct measurements. The disagreement of estimation is seems to be caused by frequency dependence of the compact Green's function. Moreover, the effect of V_z term of the sound source makes the disagreement of the estimation.
社団法人日本機械学会の論文
2009-11-06