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Computational Analysis on the Noise Characteristics of Ship Large Duct

선박용 대형 덕트의 소음 특성 전산해석 연구

Song, Jee-Hun;Hong, Suk-Yoon;Lee, Yi-Soo;Kwon, Hyun-Wung
송지훈;홍석윤;이이수;권현웅

  • Received : 2015.10.27
  • Accepted : 2015.12.28
  • Published : 2015.12.31

Abstract

Noise prediction for HVAC(Heating, Ventilating and Air Conditioning) systems are normally performed by empirical method suggested by NEBB(National Environmental Balancing Bureau, 1994). However, the method is not suitable for large ducts in ships. In this paper, computational analysis methods are used to develop a noise prediction method for the large ducts in ships. To develop regression formula of attenuation of sound pressure level in large ducts, Boundary Element Method(BEM) is used. BEM and Computational Fluid Dynamics(CFD) are applied to the analysis of flow-induced noise in ducts with stiffeners inside. Loud noise above 100 dB can be generated in some cases. Breakout noises of large ducts are also analyzed by using BEM and Finite Element Method(FEM). The acoustic pressure level shows about 10-15dB difference between inside and outside of the duct. Utilizing the results of this study, it is expected that shipyard planners can predict noise of the HVAC system for ships.

Keywords

HVAC noise;Duct noise;Boundary Element Method;Computational Fluid Dynamics;Finite Element Method;Flow-induced noise;SYSNOISE

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Acknowledgement

Grant : 해양플랜트특성화대학