Sea Technology

APR 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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properties of ice discovered in the experiments. To numerically model global forces and effects on a ship transiting ice, instead of using standard continuum mechanics, the STePS2 approach is to model via event mechanics using parallel graphical processing unit computing. This method processes algorithms 90 times faster than a normal computer. Future Dynamic Tests As ice moves along a ship���s hull, contact typically occurs at a glancing angle, indicating that the way a moving load is transferred along the structure could enhance tearing risk. To address this, Bruce Quinton, a graduate student in the STePS2 team, is building an apparatus to test moving loads. A rail system connects the yellow strongback, while the aluminum piece is the structural holder support for the panel. This will be the last major physical experiment conducted for STePS2. At 1/4 scale of the ship structural panel test���thousands to tens of thousands of pounds���this test will take place in a cold room. While this issue has been studied numerically, this will be the frst physical experiment to measure plastic damage from moving ice loads. According to current knowledge, as the ship digs into the ice, plasticity in the steel structure piles up, increasing the possibility of tearing open the structure. An improved understanding of these dynamics should inform the process of assessing the safe speed for ships. Conclusions The STePS2 project was initiated to improve the understanding of ice actions on Arctic ships and structures. The work to date has cast new light on many aspects of ice loads, structural response, and viable design and assessment strategies. It has become clear that ice-structure interaction includes many elements that interact. The simple ice-engineering load descriptions developed in the 1980s are becoming obsolete. When the project concludes in June 2014, the new fndings will be incorporated into design tools and methods that will enable engineers to design ships and offshore structures with increased accuracy. A large number of new issues have arisen in the course of the work. The next steps beyond STePS2 point to much more realistic numerical modeling, larger-scale laboratory investigations and comprehensive full-scale studies. Sea & Sun Technology Acknowledgments STePS2���s industry partners are: Husky Energy Inc. (Calgary, Canada), American Bureau of Shipping/ABS (Houston, Texas), Samsung Heavy Industries Co. Ltd. (Seoul, South Korea), Rolls-Royce Marine (London, England) and BMT Fleet Technology (Kanata, Canada). Government partners include the Atlantic Canada Opportunities Agency, with funding through its Atlantic Innovation Fund, Research & Development Corp. of Newfoundland and Labrador, Mitacs, and the Natural Sciences and Engineering Research Council of Canada. The National Research Council Canada is a key research partner. A total of 51 graduate and work-term students are conducting research over the life of the project. n Dr. Claude Daley is the STePS2 principal investigator and a professor and chair of the Ocean and Naval Architectural Engineering program at Memorial University in St. John���s, Newfoundland, Canada. He has led research and development projects on ships in ice and developed mathematical models for ship-ice interaction. He is a graduate of University of Western Ontario and Princeton University, and holds a doctorate in ice mechanics and Arctic naval architecture from Helsinki University of Technology. Dr. Bruce Colbourne is a STePS2 co-investigator and project manager. He is a professor and researcher specializing in predicting loads from ice and waves on ships and offshore structures. He also works with the Canadian Standards Association���s committee for offshore structures standards. Colbourne is a graduate of Memorial University of Newfoundland (MUN) and the Massachusetts Institute of Technology, and holds a Ph.D. in Ocean Engineering from MUN. Andrew Safer is a writer based in St. John���s, Newfoundland, Canada, who specializes in articles for international magazines about ocean technology innovations and their business applications. His previous Sea Technology articles include ���An Information Hub for Vessel Traffc Operations Aids Users in Newfoundland,��� ���Spatial Visualization of the Marine Environment��� and ���Canada���s Multibeam Platform: Advantages and Applications.��� www.sea-technology.com April 2013 / st 33

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