International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Development of a framework to estimate the sea margin of an LNGC considering the hydrodynamic characteristics and voyage

  • You, Youngjun (Daewoo Shipbuilding & Marine Engineering Co., Ltd. (DSME)) ;
  • Choi, Jin Woo (Daewoo Shipbuilding & Marine Engineering Co., Ltd. (DSME)) ;
  • Lee, Dong Young (Daewoo Shipbuilding & Marine Engineering Co., Ltd. (DSME))
  • Received : 2019.03.30
  • Accepted : 2019.09.16
  • Published : 2020.12.31
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Abstract

Decisions of the design speed, MCR, and engine capacity have been empirically made by assuming the value termed the sea margin. Due to ambiguity regarding the effect of some factors on the sea margin, the value has been commonly decided based on experience. To evaluate the value from a new viewpoint, it is necessary to construct an approach to estimate the sea margin through an objective procedure based on a physical and mathematical model. In this paper, a framework to estimate the actual sea margin of an LNGC based on the maneuvering equations of motion is suggested by considering the hull, propeller, rudder, and given sea route under wind and waves. The fouling effect is additionally quantified as the increase of total resistance by considering the re-docking period. The operation data is reviewed to amend the increase of the total resistance considering the speed loss of a ship. Finally, the factor of how much the resistance increases due to fouling is newly obtained for the vessel. Based on the comparison of the estimated sea margin with the empirical range of the sea margin, the constructed framework is regarded as feasible.

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