The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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An Experiment on Reduction of Infrasonic Underwater Self-Noise

초저주파 대역 수중 자체소음 저감에 관한 실험 연구

  • 이성욱 (한국해양연구원 해양위성.관측기술연구부) ;
  • 이용국 (한국해양연구원 해양위성.관측기술연구부) ;
  • 김성렬 (한국해양연구원 남해연구소)
  • Received : 2010.10.25
  • Accepted : 2010.12.03
  • Published : 2011.01.31
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Abstract

The effects of screening hydrophones with open-cell foams for reduction of the infrasonic self-noise induced by the flow around hydrophones are investigated by at-sea experiment. Test results of the 10 ppi polyurethane open-cell foams with different thickness show that the foams of 1 cm and 3 cm thickness reduce the flow-induced self-noises up to 20 dB and 28 dB at the frequency band of 2-10 Hz, respectively.

수중에서 음향신호를 측정할 때에 청음기 주위에서의 유동에 의해 발생하는 초저주파 대역 자체소음을 저감시키기 위해 청음기 주위에 다공성 발포재를 씌우는 기법의 효과를 해상 실험을 통해 고찰하였다. 두께가 다른 10 ppi 폴리우레탄 발포재를 이용하여 실험한 결과, 2-10 Hz 대역에서 발포재의 두께가 1 cm일 때에는 최대 20 dB 그리고 발포재의 두께가 3 cm인 경우에는 최대 28 dB의 자체소음 저감 효과가 있음을 확인하였다.

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References

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