Improvement of Navigation Optimization Technologies in ships

Abstract

Various endeavors for environmental protection are continuing in many fields of industry. The author has approached this problem by developing new technologies for minimizing fuel oil consumption to reduce exhaust gases over the navigation routes in marine transportation. In the preceeding studies, the relationship between speed drop caused by waves and wave resistance was made clear quantitatively in the case that the work of thrust to navigate straight over a definite distance is the same between calm sea and wave conditions. Moreover the amount of fuel oil consumption was analyzed to distribute the main engine outputs optimally on the basis of this relationship. In this paper, the above relationship was formulated more strictly in the case that ships navigate under wave conditions with the same main engine output as under calm sea conditions to analyze fuel oil consumption , and the decision equations for optimal steering and distribution of main engine outputs are modified. Finally, the effectiveness of the results of this study is evaluated in comparison with preceeding studies through several cases of numerical simulation.departmental bulletin pape