Sea Technology

JUN 2018

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

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www.sea-technology.com June 2018 | ST 31 Bureau of Shipping (ABS), whose classification system denoting strength levels of ice-capable hulls is widely respected in the marine industry; and Canada's Memo- rial University of Newfoundland, home to ABS's Harsh Environment Technology Center, where researchers study how ships can be designed and operated more effectively in polar regions. The three organizations are comparing their respective ice load research tools to determine areas that need further evaluation and develop collaborative methods for testing prediction models. Building on ICELOAD and other prediction models, Hess also is sponsoring Douglas Le- sar's work at NSWC Carderock, using high-fi- delity computational mechanics to analyze potential damage from ship collisions with ice. "In polar environments, there's floating ice of varying sizes and shapes," said Lesar, a modeling and simulation expert. "Collisions should be accepted as inevitable, but the main thing is to avoid big hits and manage risk by effectively controlling vessel speed and direc- tion." Lesar's research involves advanced numer- ical computer modeling on how much ice trauma a hull can take. His calculations use motion data and equations measuring the me- chanics of metallic hulls and ice breakage to create different collision scenarios and their structural damage outcomes. "Ice is a very complicated material whose properties vary with thickness, salinity and age," said Lesar. "All these factors contribute to the overall strength of sea ice. The modeling of ice crushing and fracturing also is com- putationally challenging." Lesar hopes to correlate his computer modeling data to physical experiments conducted at CRREL, or by an international research partner like the Memorial Univer- sity of Newfoundland. Captain A.D. Colburn, right, crew member Bill Dunn and others wield their ice mallets on Knorr's foredeck during the 1997 Labrador Sea cruise. (Photo Credit: George Tupper, Woods Hole Oceanographic Institution)

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