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Ships route searching with respect of sea waves danger

DOI 10.18127/j20700814-201810-01

Keywords:

V.M. Grinyak - Dr.Sc.(Eng.), Associate Professor, Professor, Vladivostok State University of Economics and Service
E-mail: victor.grinyak@gmail.com
A.S. Devyatisilny - Dr.Sc.(Eng.), Professor, Main Research Scientist, Institute of Automation and Control Processes, FEBRAS (Vladivostok)
E-mail: devyatis@iacp.dvo.ru
D.A. Akmaykin - Ph.D.(Phys.-Math.), Associate Professor, Head of Department, Maritime State University named after admiral G.I. Nevelskoy (Vladivostok)
E-mail: akmaykin@gmail.com


The problem of marine traffic safety is discussed in this paper. The problem of ships path planning taking into account heavy weather conditions (sea waves) along the route is considered. Weather conditions along the ship's route considerably affect the choice of its route as a pattern of movement in stormy conditions greatly differs from the one in calm weather. Both determination of wave parameters, when its unfavorable effect becomes considerable, and plotting of a route to avoid dangerous zones are important components of the navigator's work. The use of information provided by special meteorological services according to satellite monitoring data is promising. Integration of some meteorological satellite data can give an adequate picture of current and predicted weather conditions.
This work studies the problem of route planning taking into account information on sea wave parameters: the wave height and length. The mathematical model of the problem is based on the search of the shortest route in the weighed graph and on the conception of the industry concerning evaluation of safety of navigation shown by storm patterns. The result of the problem solution allows choosing the ship's route ensuring the traffic safety.
Basic sea wave parameters, which are taken into account in such evaluation of its danger, are the height and the length of waves, direction and rate of their propagation, the ship's length, course and speed of its movement. Solution of the problem with the help of mathematical methods of physics, calculus of variation or dynamic programming is characterized by high computation complexity. Therefore the present work suggests that it should be interpreted by the search of the shortest route on the weighed graph. This method proved itself in problems of navigation. Thus, a problem can be posed to break up a section of the surface by vertices of the graph, to determine a multitude of cortège of the vertices, providing the shortest route in the given graph taking into account the accepted metrics.
The suggested method of searching safe routes allows forming a systematized idea of potential danger degree, «waiting for» a navigator along the ship's route to the point of its destination. It is shown that in spite of the roughness of the initial data, they are able to give a practical solution for choosing the trajectory of the vessel's motion. The work is accompanied by the results of full-scale experiments. The results of the assessment of the vessels safety and path planning in the waters of the North Atlantic are presented.

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May 29, 2020

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