Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Study on the Estimation of Towing Force for LNG Bunkering Barge

LNG 벙커링 바지의 예인력 산정에 관한 연구

  • Oh, Seung-Hoon (Korea Research Institute of Ships and Ocean Engineering) ;
  • Jung, Dong-Ho (Korea Research Institute of Ships and Ocean Engineering) ;
  • Jung, Jae-Hwan (Korea Research Institute of Ships and Ocean Engineering) ;
  • Hwang, Sung-Chul (Korea Research Institute of Ships and Ocean Engineering) ;
  • Cho, Seok-Kyu (Korea Research Institute of Ships and Ocean Engineering) ;
  • Sung, Hong-Gun (Korea Research Institute of Ships and Ocean Engineering)
  • 오승훈 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정동호 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정재환 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 황성철 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 조석규 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 성홍근 (한국해양과학기술원 부설 선박해양플랜트연구소)
  • Received : 2018.10.26
  • Accepted : 2018.11.12
  • Published : 2018.12.31
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Abstract

In this paper, the towing force for the LNG bunkering barge was investigated. Currently, LNG bunkering barge is being developed as an infrastructure for the bunkering of LNG (Liquefied Natural Gas), an eco-friendly energy source. In the case of the LNG bunkering barge, self-propulsion is considered through retrofit from an operating point. Therefore, the LNG bunkering barge's shape is similar to that of the ship as compared to a towed barge, so a rule of the towed barge overestimates the towing force. In order to improve accuracy, the calm water resistance was calculated using ITTC 1978 method which considers wave resistance by the Rankine source method. The added resistance in waves was calculated using the modified radiated energy method which considers the shortwave correction method of NMRI. The performance of the towing resistances through the calm water resistance and the added resistance in waves was compared to rules associated with towed barges.

본 논문에서는 LNG 벙커링 바지에 대한 예인력을 계산하였다. 친환경 에너지원인 LNG(액화천연가스)의 전환을 위한 인프라로 LNG 벙커링 바지가 개발되고 있다. LNG 벙커링 바지의 경우, 부선의 형태로 개발되고 있으나 향후 운용관점에서 추진기 탑재 개조(Retrofit)를 통한 자항추진을 고려하고 있다. 따라서 LNG 벙커링 바지는 일반적인 예인바지와 비교하여 선박의 선형과 유사하기 때문에 선급의 부선 규칙을 통한 예인력은 과대 추정된다. 이를 극복하기 위해, 정수 중 저항은 Rankine source method를 이용한 조파저항을 고려하여 ITTC 1978 방법에 따라 계산하였고 파랑 중 부가저항은 NMRI의 단파장 보정이 고려된 수정된 방사에너지법을 이용하여 계산하였다. 계산된 정수 중 저항과 부가저항을 통해 예인저항 성능을 KR 선급의 부선 규칙과 비교 검토하였다.

Keywords

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Fig. 1 Ship to ship bunkering using LNG bunkering barge

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Fig. 2 Panel model for Rankine source method

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Fig. 3 Wave resistance coefficient for Wigley using Rankine source method

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Fig. 4 Coordinate system for added resistance in short waves

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Fig. 5 Three dimensional geometry of hull

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Fig. 6 Panel model for LNG bunkering barge

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Fig. 7 Calculated wave pattern of LNG bunkering barge

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Fig. 8 Wave resistance coefficients of LNG bunkering barge

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Fig. 9 Total resistance coefficients of LNG bunkering barge

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Fig. 10 Total resistance on LNG bunkering barge

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Fig. 11 Section model for strip method

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Fig. 12 Water line model for shortwave correction method of NMRI

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Fig. 13 Heave R.A.O of LNG bunkering barge in head wave

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Fig. 14 Pitch R.A.O of LNG bunkering barge in head wave

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Fig. 15 Added resistance in wave of LNG bunkering barge in head wave

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Fig. 16 Bow shape at water plane for sensitivity test

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Fig. 17 Sensivity test of added reistance according to the variation of the bow shape at water plane

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Fig. 18 Sensivity test of added reistance according to the variation of the radius of gyration

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Fig. 19 Heave R.A.O according to the variation of the radius of gyration

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Fig. 20 Pitch R.A.O according to the variation of the radius of gyration

Table 1 Particulars of LNG bunkering barge

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Table 2 Ship speeds of LNG bunkering barge

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Table 3 Resistance of LNG bunkering barge

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Table 4 Added resistance in irrgular waves of LNG bunkering barge

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Table 5 Total towing force of LNG bunkering barge

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Table 6 Added resistance of barge (KR, 2014)

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Table 7 Added resistance in irrgular waves according to the variation of the bow shape at water plane

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Table 8 Added resistance in irrgular waves according to the variation of the radius of gyration

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