Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Noise Reduction Effect of an Air Bubble Layer on an Infinite Flat Plate Considering the Noise of Multi-bubbles

다중기포 발생소음을 고려한 무한평판 주위에 형성된 수중 기포층의 방사소음 감소 효과

  • 김종철 (국방과학연구소 제 6기술연구본부) ;
  • 허보현 (국방과학연구소 제 6기술연구본부) ;
  • 조대승 (부산대학교 조선해양공학과)
  • Published : 2009.11.20
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Abstract

A theoretical model was developed to compute the effect of a bubble layer in reducing the radiation noise generated by a force applied on an infinite flat plate considering the noise of multi-bubbles. Using the model, the effectiveness of a bubble layer in reducing the structure-borne noise of the plate was evaluated to consider various parameters such as the source noise levels, the thickness of bubble layers, the volume fractions and the frequency characteristics of bubbly fluids. Considering the noise of multi-bubbles, the actual reduction effect of radiation noise using a bubble layer was expected in cases of high source levels, high volume fractions of bubbles and large thickness of the bubble layer above the resonance frequency of the bubble layer. Accordingly, it is recommended that the thickness of a bubble layer, the source noise level and the characteristics of bubbly fluids should be optimized cautiously to maximize noise reduction effects.

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References

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