A new weather-routing system that accounts for ship stability based on a real-coded genetic algorithm |
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| Authors: | Atsuo Maki Youhei Akimoto Yuichi Nagata Shigenobu Kobayashi Eiichi Kobayashi Shigeaki Shiotani Teruo Ohsawa Naoya Umeda |
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| Institution: | (1) Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukae-Minami, Higashinada, Kobe 658-0022, Japan;(2) Present address: Naval Systems Research Center, Technical Research & Development Institute, Ministry of Defense, 2-2-1 Nakameguro, Meguro, Tokyo 153-8630, Japan;(3) Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Natatsuta, Midoriku, Yokohama 226-8502, Japan;(4) Department of Naval Architecture and Ocean Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita Osaka, 565-0971, Japan; |
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| Abstract: | The operation schedule of an oceangoing vessel can be influenced by wave or wind disturbances, and is therefore weather routed.
The weather-routing problem is considered to be a multimodal function problem. Therefore, in the present research, the real-coded
genetic algorithm technique (an evolutionary calculation technique) is applied to globally search for the optimum route. Additionally,
to avoid maritime accidents due to parametric rolling, this route optimization method takes into account the risk of parametric
rolling as one of its objective functions. Numerical verification is carried out for three kinds of objective functions with
different weight ratios between fuel efficiency and ship safety in parametric rolling. As a result, it is numerically confirmed
that the relation between economics and ship safety is a trade-off, and the safer route is not necessarily the most economical.
Considering its robustness, the proposed method appears to be a powerful practical tool by choosing the most appropriate weights
for economics and ship safety. |
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