127 空力加振に起因した車内騒音予測に関する試み(空力騒音の解析・改善)

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  • 127 A trial regarding the prediction of interior noise caused by aerodynamic force
  • 空力加振に起因した車内騒音予測に関する試み
  • クウリキカシン ニ キイン シタ シャナイ ソウオン ヨソク ニ カンスル ココロミ

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In order to predict interior noise of automobiles, aeroacoustics simulation was carried out. Generally, flow fields are calculated in the time domain. Therefore, acoustic analysis of interior noise caused by aerodynamic noise and force should also be solved in time domain. CIP method is suitable for time domain wave equation analysis. In this investigation, we attempted to apply the CIP method to calculate the Lighthill equation. The simulation results showed this method is possible to calculate accurately the aerodynamic noise. Moreover, the results showed that the contribution of aerodynamic sound around a car body to the interior car noise is larger than that of the hydrodynamic pressure fluctuation of vehicle surface.

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