Predictions of propeller loads due to ice contact

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Journal titleInternational Shipbuilding Progress
Pages221239; # of pages: 19
AbstractWhen navigating in ice, a ship's propeller experiences extremely high loads due to its interaction with submerged pieces of ice. A model is developed that simulates the process that occurs when an open marine screw propeller and a submerged ice body come into contact. The time simulation predicts the ice contact forces acting on a propeller blade and the motion response of ice. The equations of ice body motion are solved time-stepwise with a numerical integration routine that forms the core of the simulation model. The propeller is treated as a rigid body with constant rotational and translational velocities. The ice body shape is idealized as spherical and changes in mass due to cutting are ignored. A propeller-ice contact model, based primarily on laboratory ice cutting experiments, is developed. Selection simulation model results are presented for propeller-ice interaction events over a systematically varied range of parameters. The results indicate several features important to the propeller-ice cutting process: the operating conditions of the propeller and the size of the ice body are important parameters influencing propeller loading; the propeller-ice contact force depends approximately on the square of the propeller diameter; and the effect of ice motion on the cutting process is to reduce the severity and duration of contact loads compared to cases where the ice cannot move.
Publication date
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedYes
NRC number6150
NPARC number8895940
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Record identifiere871e1e7-441b-4214-89aa-a930be9a2132
Record created2009-04-22
Record modified2016-05-09
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