A new weather-routing system that accounts for ship stability based on a real-coded genetic algorithm

  • Atsuo Maki
  • Youhei Akimoto
  • Yuichi Nagata
  • Shigenobu Kobayashi
  • Eiichi Kobayashi
  • Shigeaki Shiotani
  • Teruo Ohsawa
  • Naoya Umeda
Original Article


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.


Weather-routing Ship stability Real-coded genetic algorithm 



The short-term prediction of the added resistance and acceleration of the bow section was obtained by using the RIOS (Research Initiative on Oceangoing Ships) system developed at Osaka University. The authors are grateful to members of the RIOS for their support.


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Copyright information

© JASNAOE 2011

Authors and Affiliations

  • Atsuo Maki
    • 1
    • 2
  • Youhei Akimoto
    • 3
  • Yuichi Nagata
    • 3
  • Shigenobu Kobayashi
    • 3
  • Eiichi Kobayashi
    • 1
  • Shigeaki Shiotani
    • 1
  • Teruo Ohsawa
    • 1
  • Naoya Umeda
    • 4
  1. 1.Graduate School of Maritime SciencesKobe UniversityKobeJapan
  2. 2.Naval Systems Research CenterTechnical Research & Development Institute, Ministry of DefenseTokyoJapan
  3. 3.Interdisciplinary Graduate School of Science and EngineeringTokyo Institute of TechnologyYokohamaJapan
  4. 4.Department of Naval Architecture and Ocean Engineering, Graduate School of EngineeringOsaka UniversitySuitaJapan

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