309 曲円柱から発生する空力音の音源探査に関する研究

概要

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The purpose of this research is to clarify the sound source regions of the aerodynamic sounds generated by the bent round bars. In the experiment, the coherence between the aeolian sound and the velocity fluctuation of the wake behind the bent round bar is examined and the wake region with a strong correlation is obtained by calculating the band overall value of C. O. P.(Coherent output power) which is the product of the coherence and the power spectrum of the velocity fluctuation. The experimental results show that this method is possible to clarify a sound source region generated by a speaker located in the air flow. And it shows that the large band overall values of C. O. P. are distributed in the wake region behind the curved part and that this region can be regarded as the source of aeolian sound.
社団法人日本機械学会の論文
2002-09-13