Abstract
Dynamic positioning (DP) capability plots in open water are essential tools both for ship design and operational risk assessment. Currently the capability plots are widely used by the whole ship sector. Furthermore, the calculations and representations of the capability plots have been standardized by the International Marine Contractors Association (IMCA). In a capability plot, the wind, current and wave loads are taken into account and the plots are given in polar coordinates [1]. Recent research and ice basin experiments have demonstrated the feasibility of DP operations in ice-covered waters [2]. However, the design of a similar analysis tool as the capability plot is complicated by both a large range of ice parameters and the lack of understanding of the ship/ice interaction physics at low relative velocities [3]. In this paper, the influence of several ice parameters is studied in order to identify the most important variables for DP in ice. The study comprises both ice basin experiments and numerical simulations. The ice basin test results are extracted from the trials carried out at the large ice tank of Hamburg Ship Model Basin (HSVA) within the scope of the European research and development project DYPIC [2]. The numerical modelling is based on a novel high-fidelity simulation approach which is discussed in the paper. Finally, “ice capability plots” are drawn under certain hypothesis and assumptions.
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