自動車ドアミラー周りに形成される低周波の空力音源に関する研究

抄録

In order to apply the hot-film sensor for the analysis of the aerodynamic sound source, we measured the noise signal on the automobile door mirror. CAA (Computational Aeroacoustics) was applied for the estimation for the magnitude of the quantitative noise source. We clarified that the one of the features of the aerodynamic noise generated from the actual automobile mirror in the wind tunnel test were low frequency noise. The low frequency noise was occurred by the perturbation of the long wave length formed at the tip of the mirror. The fluctuation signal of the hot-film sensor became large at the tip of the mirror. The results of measured signal indicated the same tendency in the CAA analysis.