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Optimal ballast scheme design for cargo ships using an improved genetic algorithm
by Jing Chen, Yan Lin, Jun Zhou Huo, Ming Xia Zhang, Zhuo Shang Ji
International Journal of Innovative Computing and Applications (IJICA), Vol. 2, No. 2, 2009


Abstract: Loading design is a key stage in ships' design process, and directly affects ships' stability, strength, and attitude at sea. The problem of loading design is a multi-objective combinatorial optimisation problem with multiple nonlinear constraints. In this paper, based on the complex technical requirements of ships' loading design, a mathematical model was constructed, taking the overall longitudinal strength and the intact stability performances as objectives, and the limits of ship's attitude, stability and strength, etc. as constraints. A strategy of tanks being fully-loaded-first was adopted and the corresponding improved genetic algorithm was presented where a novel heuristic dynamic adjusting rule was proposed to dynamically adjust the normalising coefficients of the non-commensurable objectives. Finally, a real case study on the loading design of a 50,000 DWT double hull product tanker was conducted to illustrate the effectiveness of the proposed method.

Online publication date: Wed, 24-Feb-2010


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