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

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Development of Shipboard Large-sized Low-noise Room Unit with Multiple Outlets

다수의 출구를 가진 선박용 대형 저소음 룸유닛 개발

  • 김상렬 (한국기계연구원 시스템다이나믹스 연구실 음향소음팀) ;
  • 김현실 (한국기계연구원 시스템다이나믹스연구실) ;
  • 이성현 (한국기계연구원 시스템다이나믹스연구실) ;
  • 박근효 (하이에어코리아 기술연구소)
  • Received : 2012.03.21
  • Accepted : 2012.04.20
  • Published : 2012.05.20
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Abstract

In this paper, the acoustic performance of a shipboard large-sized room unit is studied. The room unit is a kind of rectangular absorptive chamber with a partition whose surface absorptive material with fabric skin is attached to. The room unit has one inlet and three outlets. At the inlet, a plane damper is installed to control the flow rate. The acoustic performance of a prototype room unit is measured using a HVAC mock-up. It is shown that its insertion loss is comparable with that of a commercially-used room unit but the developed room unit generates flow noise higher than the other one. The major source of flow noise is analyzed by NADS-R, the noise analysis program for room unit. Cone-shaped dampers are proposed to be used as the damper of a room unit to reduce flow noise. It is shown that the cone-shaped damper decrease flow noise remarkably.

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References

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  9. Kim, S. R., Kim, H.-S., Kim, J.-S., Kim, B.-K. and Lee, S.-H., 2011, Measurement of Noise Characteristics of Shipboard Room Units with Multiple Outlets, Proceedings of the Acoustic Society of Korea Annual Spring Conference, Vol. 30, No. 1, pp. 63-66.
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