Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Analysis on the Pitch Response Spectra of a Catamaran with Bulb

벌브를 가진 쌍동형 선박의 종동요 응답 스펙트럼 분석

  • Seo, Kwang-Cheol (School of Marine Science and Technology, Newcastle University) ;
  • Lee, Chang-Woo (Dept. of Naval Architecture & Ocean Engineering, Mokpo National Maritime University) ;
  • Atlar, Mehmt (School of Marine Science and Technology, Newcastle University) ;
  • Lee, Gyoung-Woo (Dept. of Naval Architecture and Ocean Engineering, Mokpo National Maritime Uni.) ;
  • Gim, Ok-Sok (School of Marine Science and Technology, Newcastle University)
  • Received : 2013.06.20
  • Accepted : 2013.10.16
  • Published : 2013.10.31
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Abstract

In this study, a commercial seakeeping program Seakeeper, integrated into Maxsurf, which is based on the linear strip theory was employed to compare the effect of bulbous bow (with/without) on motion response characteristics in a 18-meter catamaran. The seakeeping analyses were conducted at several Beaufort wind conditions such as scale No. 3 ($\bar{T}=2.98s$, $H_{1/3}$ =0.6m), No. 4 ($\bar{T}=3.85s$, $H_{1/3}$ =1m) and No. 5 ($\bar{T}=5.44$, $H_{1/3}$ =2m) based on ITTC wave spectrum. Pitch motion response spectrum was calculated at Head sea, Head & bow sea and Beam sea as encounter angles. Hull form of a catamaran with bulb showed the maximum 20% decrease of pitch motion response as compared to that of hull form without bulb.

본 연구에서는 18미터급 쌍동형 선형의 선수벌브 유무에 따른 운동응답특성을 선형 스트립이론에 기초한 상용코드(Seakeeper)를 이용하여 추정하였다. 계산조건으로는 ITTC 파스펙트럼에 기초한 뷰포트 풍력계급 3 ($\bar{T}=2.98s$, $H_{1/3}$ =0.6m), 4 ($\bar{T}=3.85s$, $H_{1/3}$ =1m) 및 5 ($\bar{T}=5.44$, $H_{1/3}$ =2m)의 파스펙트럼을 산출하였고, 조우각은 선수파, 선수사파 및 횡파를 적용하여 종동요의 선체운동응답스펙트럼을 해석하였다. 선수벌브가 적용된 쌍동선 선형은 선수파와 선수사파에서 최대 20%의 종동요 응답이 감소하는 효과를 나타냈다.

Keywords

References

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