Numerical Predictions of Global and Local Ice Loads on Ships
Year: 2011 Language: english Author: Biao Su Genre: Research papers Publisher: Norwegian University of Science and Technology ISBN: 978-82-471-2853-4 Format: PDF Quality: eBook Pages count: 175 Description: Ice loads represent the dominant load for ice-going ships, and it is important to estimate both global and local ice loads on ship hulls. The global ice load governs the ship’s overall performance in ice, and it is an integrated effect of local ice loads over the hull area. Information on the distributions of local ice loads around the hull can be used for more effective design of ice-going ships both in terms of overall operation and from the structural point of view. The present thesis focuses on a numerical model for simulating ice–hull interaction and ship maneuvers in level ice. This model is partly based on the empirical data, by which the observed phenomena of continuous icebreaking can be reproduced. In the simulation of a full-scale icebreaking run, the interdependence between the ice load and the ship’s motion is considered, and the three degree-of-freedom (DOF) rigid body equations of surge, sway and yaw are solved by numerical integration. The thickness and strength properties of the ice encountered by the ship are assumed to be constant or predefined based on the statistical data. Accordingly the global and local ice loads on ship hulls can be obtained in a deterministic or probabilistic way.
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Numerical Predictions of Global and Local Ice Loads on Ships
Language: english
Author: Biao Su
Genre: Research papers
Publisher: Norwegian University of Science and Technology
ISBN: 978-82-471-2853-4
Format: PDF
Quality: eBook
Pages count: 175
Description: Ice loads represent the dominant load for ice-going ships, and it is important to estimate both global and local ice loads on ship hulls. The global ice load governs the ship’s overall performance in ice, and it is an integrated effect of local ice loads over the hull area. Information on the distributions of local ice loads around the hull can be used for more effective design of ice-going ships both in terms of overall operation and from the structural point of view.
The present thesis focuses on a numerical model for simulating ice–hull interaction and ship maneuvers in level ice. This model is partly based on the empirical data, by which the observed phenomena of continuous icebreaking can be reproduced. In the simulation of a full-scale icebreaking run, the interdependence between the ice load and the ship’s motion is considered, and the three degree-of-freedom (DOF) rigid body equations of surge, sway and yaw are solved by numerical integration. The thickness and strength properties of the ice encountered by the ship are assumed to be constant or predefined based on the statistical data. Accordingly the global and local ice loads on ship hulls can be obtained in a deterministic or probabilistic way.
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