Method of successive divergence of ship with two dangerous targets

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Method of successive divergence of ship with two dangerous targets

Journal Title: Автоматизация судовых технических средств - Year 2018, Vol 1, Issue 24

Abstract

In the districts of intensive navigation often there is the situation of rapprochement of ship with two dangerous targets, in which a ship can not safely divide with both targets by a general maneuver, therefore there is the necessity of conducting of two successive maneuvers of divergence with each of aims separately. The situation of dangerous rapprochement of ship with two aims is considered in the article, thus divergence with the first target executes a ship by the change of course, and with the second targets - change of speed. Safe divergence of ship foresees in the beginning deviation from the first (the nearest) target by a course which gets out so that a relative course provided equality of distance of the shortest rapprochement of ship with the first target with minimum-possible distance. The moment of time of completion of divergence with the first target and beginning of braking for divergence with the second target is determined as moment of time of achievement of traverz distance with the first target, thus on the got moment of time determination of distance to the second target is foreseen, and then to compare him to minimum - possible distance. In the case of superiority of minimum - possible distance it is necessary to multiply the value of increase of course of deviation until distance to the second target will become equal or more of minimum - possible distance. For this distance, bearing on the second target is determined, thus rapprochement with the second target at this course is dangerous. A maneuver by speed for divergence with the second target foresees verification of possibility of safe divergence by the stop of ship as a result of braking. For this target it is necessary to define sailing ship and time domain to her stop taking into account the mode of braking, whereupon comparison of distance of the shortest rapprochement of ship with the second target with minimum - possible distance is produced, and in the case of their equality safe divergence with the second target by the stop of ship is possible. Frequently divergence is possible by the decline of speed of ship to the defined value. In the article resulted analytical expressions of calculation of duration of transitional process of the active braking and size the passed distance for this time, allowing to expect parameters of maneuver of divergence of ship with the second target by the decline of speed. Offered method of divergence of ship with two dangerous targets by the successive changes of course and speed realized in the computer program. As an example the situation of dangerous rapprochement of ship with targets with the preset parameters was considered.

Authors and Affiliations

Vladislav Pyatakov, Olga Petrichenro

Keywords

safety of navigation. warning of collisions. successive maneuver of divergence with two targets. active braking

EP ID EP408872
DOI -
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