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고부가가치선 선실의 소음 저감용 복합패널의 차음특성 해석
권현웅(Hyun-Wung Kwon),홍석윤(Suk-Youn Hong),길현권(Hyun-Gwon Kil),김화묵(Hwa-Muk Kim),송지훈(Jee-Hun Song) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.3
Recently, as the importance of the interior noise in a ship cabin has risen, ship builders have becomeconcerned about the use of noise reduction panels to reduce cabin noise. The results of previous researches have been based on analytical and experimental methods using simple sandwich panels. However, panel structures are becoming more complex to improve the transmission loss. Thus, researches that analyze the transmission loss of a panel are reaching the limit of study. This paper reports on research that was performed to determine the sound transmission characteristics of multi-complex panels applicable to high value-added vessels. It presents comparisons between analytical methods and experimental results by using a mini-reverberant chamber with components of sound attenuation panels, including the core and surface materials. The sound transmission loss of multi-complex panels are also analyzed in terms of the influences of the inside perforate plates and air gap thickness on the attenuation. Finally, the multi-complex panel with the highest noise attenuation is proposed based on the analysis results and experimental results in mini-reverberant chamber, which wereverified using a real-size reverberant chamber.
정재덕(Jung, Jae-Deok),홍석윤(Hong, Suk-Yoon),길현권(Kil, Hyun-Gwon),송지훈(Song, Jee-Hun),권현웅(Kwon, Hyun-Wung),전재진(Jeon, Jae-Jin),서영수(Seo, Youngsoo) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.7
Underwater acoustic sensors are significantly damaged from underwater explosion. The damage that affects sensor should be evaluated for its smooth operations and safety. For satisfying these objectives, it is necessary to obtain more accurate values of the pressure and the energy flux density by distance. This paper is divided into two part. First, to obtain more accurate value of the pressure and the energy flux density at each point, the simulation results and the reference values were compared. For fitting to the reference pressure and the reference energy flux density, the sizes of fluid and TNT model are corrected, and the comparison results show good agreements. Second, based on these results, the structural integrity of underwater sensor structure was analyzed when TNT located in 10 meters from underwater sensors structure. This simulation used the commercial software MSC/DYTRAN.