7th Canadian Marine Hydromechanics and Structures Conference, 20-21 September 2005, Halifax, N.S., Canada
Extreme ice loads acting on a model propeller blade during propeller-ice interactions are studied for input to the design and maintenance of ice class propellers. The main focus of this paper is to develop a framework for analyzing ice loads on a propeller blade using probabilistic methods based on experimental results. The Poisson distribution is used for the events of the propeller-ice interactions and the cumulative density function for extreme ice loads is modeled by a double exponential form (Gumbel Type). Propeller-ice interaction experiments were conducted in the ice tank at the National Research Council of Canada Institute for Ocean Technology (NRC/IOT). A model podded propeller was used for the experiments and ice loads were measured with a sixcomponent dynamometer attached to the root of the propeller blade inside the hub. Based on the experimental results, extreme values are plotted with an exceedance probability. Some results for the maximum blade thrust, the maximum shaft thrust and the maximum out of plane bending moment are presented in this paper. The modeling of the extreme probability is also described briefly.
7th Canadian Marine Hydromechanics and Structures Conference [Proceedings].