音響的な近傍/遠方場を考慮した自動車空力騒音予測手法の開発

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  • Estimation Method for Vehicle Aerodynamic Noise Considering Near and Far Acoustic Fields
  • オンキョウテキ ナ キンボウ/エンポウジョウ オ コウリョ シタ ジドウシャ クウリキ ソウオン ヨソク シュホウ ノ カイハツ

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抄録

An estimation method for vehicle aerodynamic noise considering characteristic of acoustic near field and far field is suggested. Wave length of low frequency sound is so long that local pressure fluctuations which are called pseudo-sound are predominant over acoustic waves. Therefore low frequency aerodynamic noise inside the cabin is affected by pseudo-sound on a vehicle body surface. On the other hand, wave length of high frequency sound is shorter than that of low frequency one. Pseudo-sound attenuates and a vehicle body surface is excited by not only it but also acoustic waves.

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