This paper presents an analysis of local ice loads measured during full-scale field trials conducted in 2014 with a totally enclosed motor propelled survival craft (TEMPSC) in controlled pack ice conditions. These data were collected as part of an ongoing research program that aims to identify the limitations of conventional TEMPSC operating in sea ice environments and to provide insight as to how these limitations might be extended. During the 2014 trials, local ice loads were measured at two locations on the TEMPSC's bow area. These loads were the most severe measured to date and corresponded to an average ice floe mass that was approximately 1.25 times the mass of the fully loaded TEMPSC. The event-maximum method of local ice pressure analysis was used to analyze these field data to improve understanding of the nature of ice loads for such interactions and to evaluate the suitability of this approach for design load estimation for TEMPSCs (i.e., lifeboats) in ice. The event-maximum method was adapted for the present application, so as to link exceedance probabilities with design load levels for a given scenario. Comparison of the 2014 results with a previous analysis of 2013 field trials data supports earlier conclusions that these interactions are highly influenced by kinetic energy, since more massive ice floes are observed to impart significantly higher loads on the lifeboats. Illustrative examples examining the influence of ice concentration and sail-away distance have also been provided. The work establishes links between extreme loads and the exposure of the lifeboat to ice for different operating conditions. Based on this work it is concluded that the event-maximum method provides a promising approach for establishing risk-based design criteria for lifeboats if field data are available which adequately represent ice conditions encountered during the design life of the lifeboat.
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August 2015
Research-Article
Probabilistic Analysis of Local Ice Loads on a Lifeboat Measured in Full-Scale Field Trials
Md Samsur Rahman,
Md Samsur Rahman
1
Faculty of Engineering and Applied Science,
S. J. Carew Building,
Arctic Avenue,
e-mail: msr303@mun.ca
Memorial University of Newfoundland
,S. J. Carew Building,
Arctic Avenue,
St. John's, NL A1B 3X5
, Canada
e-mail: msr303@mun.ca
1Corresponding author.
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Rocky S. Taylor,
Rocky S. Taylor
Centre for Arctic Resource Development, C-CORE,
Bartlett Building,
Morrissey Road,
e-mail: rocky.taylor@card-arctic.ca
Memorial University of Newfoundland
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Allison Kennedy,
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e-mail: Allison.Kennedy@nrc-cnrc.gc.ca
Allison Kennedy
National Research Council of Canada
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António Simões Ré,
1 Arctic Avenue,
P.O. Box 12093,
e-mail: Antonio.SimoesRe@nrc-cnrc.gc.ca
António Simões Ré
National Research Council of Canada
,1 Arctic Avenue,
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Brian Veitch
Brian Veitch
Faculty of Engineering and Applied Science,
S. J. Carew Building,
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Memorial University of Newfoundland
,S. J. Carew Building,
Arctic Avenue,
St. John's, NL A1B 3X5
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Md Samsur Rahman
Faculty of Engineering and Applied Science,
S. J. Carew Building,
Arctic Avenue,
e-mail: msr303@mun.ca
Memorial University of Newfoundland
,S. J. Carew Building,
Arctic Avenue,
St. John's, NL A1B 3X5
, Canada
e-mail: msr303@mun.ca
Rocky S. Taylor
Centre for Arctic Resource Development, C-CORE,
Bartlett Building,
Morrissey Road,
e-mail: rocky.taylor@card-arctic.ca
Memorial University of Newfoundland
,Bartlett Building,
Morrissey Road,
St. John's, NL A1B 3X5
, Canada
e-mail: rocky.taylor@card-arctic.ca
Allison Kennedy
National Research Council of Canada
,1 Arctic Avenue,
P.O. Box 12093,
St. John's, NL A1B 3T5
, Canada
e-mail: Allison.Kennedy@nrc-cnrc.gc.ca
António Simões Ré
National Research Council of Canada
,1 Arctic Avenue,
P.O. Box 12093,
St. John's, NL A1B 3T5
, Canada
e-mail: Antonio.SimoesRe@nrc-cnrc.gc.ca
Brian Veitch
Faculty of Engineering and Applied Science,
S. J. Carew Building,
Arctic Avenue,
Memorial University of Newfoundland
,S. J. Carew Building,
Arctic Avenue,
St. John's, NL A1B 3X5
, Canada
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received November 26, 2014; final manuscript received March 13, 2015; published online May 20, 2015. Assoc. Editor: Søren Ehlers.
J. Offshore Mech. Arct. Eng. Aug 2015, 137(4): 041501 (14 pages)
Published Online: August 1, 2015
Article history
Received:
November 26, 2014
Revision Received:
March 13, 2015
Online:
May 20, 2015
Citation
Rahman, M. S., Taylor, R. S., Kennedy, A., Simões Ré, A., and Veitch, B. (August 1, 2015). "Probabilistic Analysis of Local Ice Loads on a Lifeboat Measured in Full-Scale Field Trials." ASME. J. Offshore Mech. Arct. Eng. August 2015; 137(4): 041501. https://doi.org/10.1115/1.4030184
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