混合整数線形計画法に基づくＬＮＧ船機関部システムの最適計画

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  • An optimal planning method of an LNG carrier's energy supply plant based on mixed-integer linear programming.
  • コンゴウ セイスウ センケイ ケイカクホウ ニ モトズク LNGセン キカンブ

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The objective of this paper is to develop an optimal planning method for the initial design of an energy supply plant of an LNG carrier. With the objective of minimizing the total annual cost, both the scales and numbers of various equipment of the above plant are investigated in order to be planned optimally together with operational policies for several energy demands of steam, electric power and propulsion. This planning problem is first formulated as a mixed-integer linear programming one, by adopting zero-one integer variables indicating the equipment's selection or the on/off status of operation together with continuous variables indicating the operational level of each equipment. Then, the optimal selection and operational policies of the equipment are determined numerically by adopting the branch and bound algorithm. Lastly, the effectiveness of the planning method proposed here is ascertained through a numerical study for an energy supply plant of actual scale.

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