METHOD AND DECISION SUPPORT SYSTEM FOR THE INTENTIONAL EMERGENCY GROUNDING IN THE PORT LIMITS

Abstract

The aim of the study is to develop the structure of an onboard decision support system and a decision support method for managing a ship in a degraded state during high sea conditions when stranded, to assess the consequences of such an event. This goal is achieved by processing the initial data for selected scenarios and displaying the necessary information on board the ship for decision makers to assess the consequences of a deliberate grounding. The initial data of the method are the characteristic parameters of the basic types of vessels and typical grounding scenarios. The sources of initial information are hull sensors and loading computer including on board sensors. Based on the selected grounding scenarios for certain types of vessels, parametric formulae can be derived to assess damage and contact forces between the vessel and the seabed, taking into account the load from still water, dynamic load from waves and tides, and local contact forces from the seabed. The decision support system integrates individual modules into a common data warehouse and a common human-machine interface. The most significant results are the development of the structure of the onboard decision support system and an appropriate method for managing a ship in a forced grounding, which allows decision makers to act effectively on board and ashore in selected critical scenarios. The significance of the obtained results lie in the development of a decision support method for controlling a ship in a degraded state when stranded, which is distinguished by the division of the grounding process into rigid body motion and resistance to penetration into the bottom structure, which is calculated on the basis of pre-established resistance dependencies, taking into account the degradation of the strength of the hull beams due to bottom damage and initial damage, thus allowing decisions to be made in real time and assessing the consequences of such an event (structural damages, water ingress or oil spillage). Thus, the studies have shown the effectiveness of the proposed approach for assessing ship control to limit sea loads so that hull damage does not spread to a critical level for the entire ship, and, in extreme cases, to assess the consequences of ship grounding.