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Assessment of a critical area for a give-way ship in a collision encounter

Krata P., Montewka J.

Archives of Transport

2015

Vol. 34, iss. 2

51--60

Evasive action in ship-ship encounter has to be carried out on time and in line with the international convention on collision regulation – COLREG. The convention not only includes a set of rules defining types of relations between encountering ships but also indicates appropriate action to be taken in a given encounter. One of such encounters is crossing, where, in case of a collision situation, a give-way ship has to take an appropriate action in due time. However, a stand-on vessel is also given an opportunity to manoeuver, if it is made clear to her that the other ship is not fulfilling her obligations. However, it is difficult to specify, at which point in time in the course of an encounter, the stand-on ship has to take an action in order to avoid collision. It is understandable, as this parameter depends on numerous factors, both endogenous (e.g. ship characteristics, her maneuverability), and exogenous (e.g. type of encounter, weather conditions). Therefore in this paper we make an attempt towards the definition of the critical area for a maneuver of a stand-on ship, in the situation where the give-way vessel does not take an action. This is determined with the use of a hydrodynamic model of ship motion, and series of simulations conducted for several types of encountering ships under various conditions. Once determined, the critical area demarcates the no-go area around the own ship, where any other ships on collision courses must not enter. Otherwise a collision cannot be avoided by an action of one ship alone.

Analysis of ship's safety improvement in confined waters with use of the decision support system based on expert manoeuvres

Zalewski P.

Journal of KONBiN

2008

No. 4 (7)

249-267

The paper presents analysis of possible ship's safety improvement in confined waters with the use of an expert system for navigator's decision support, constructed on the grounds of the knowledge base of gathered manoeuvres for a given type of ship, loading and hydrometeorological condition. The system generates results of encountered decision problems in the form of information about proposed adjustments of main engine, helm and tugs controls and future trajectory presented by means of panoramic graphic interface equivalent to vector large scale ENC and text interface of commands.

W artykule przedstawiono analizę możliwości zwiększenia bezpieczeństwa statku na akwenie ograniczonym stosując ekspertowy system wspomagania nawigacyjnego zbudowany na podstawie bazy wiedzy zebranych manewrów dla danego typu statku w określonym stanie załadowania i warunkach hydrometeorologicznych. System generuje wyniki rozwiązań problemów decyzyjnych w formie informacji o proponowanej nastawie maszyny głównej i steru, kącie i nastawie uciągu liny holowniczej oraz przyszłej trajektorii. Wyniki prezentowane są przy pomocy panoramicznego interfejsu graficznego odpowiadającego mapie wektorowej o dużej skali oraz interfejsu tekstowego komend.