115 流れ場の時系列情報に基づく空力騒音の実験的評価法(流れ場と空力騒音,騒音・振動評価・改善技術)

概要

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We propose an experimental evaluation method of dipole sound based on the vortex sound theory. In order to obtain an unsteady two-dimensional flow field phenomena essential to apply the theory, we measured time series data of the flow field around a circular cylinder in a wind tunnel test by using dynamic PIV. The calculated sound pressure at the far field is validated by the correlation analysis with the measured sound pressure. Furthermore, we performed a correlation analysis between the source intensity defined as the integrand in the equation of the vortex sound theory and the measured sound pressure to clarify the relationship between the calculated dipole sound and measured flow field. It is shown that the estimated sound pressure can detect the Aeolian tone due to the Karman vortex shedding. Periodic fluctuation around the shear layer separation points and the vortex formation region in the wake causes the estimated dipole sound.
一般社団法人日本機械学会の論文
2008-07-09