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Memorial University - Electronic Theses and Dissertations 1
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Document Description
TitleOptimal design of bow plating for ships operating in ice
AuthorBrown, Peter Wilfred, 1966-
DescriptionThesis (M.Eng.)--Memorial University of Newfoundland, 1994. Engineering and Applied Science
Date1993
Paginationxviii, 154 leaves : ill.
SubjectHulls (Naval architecture); Icebreakers (Ships); Ships--Cold weather operation
DegreeM.Eng.
Degree GrantorMemorial University of Newfoundland. Faculty of Engineering and Applied Science
DisciplineEngineering and Applied Science
LanguageEng
NotesBibliography: leaves 93-99
AbstractExtensive work has been carried out in recent years to ensure that ice-capable ships are both safe and economical. The present analysis provides a methodology which can be employed by the designer to calculate the optimum bow plating thickness for operation in ice. To this end, a local ice load model is re-evaluated using a probabilistic analysis of full scale data, probabilities of failure for plating are calculated and plate thickness is optimised. -- Full scale data for the MV Canmar Kigoriak and USCGC Polar Sea were ranked; curves were fitted through the tail of each data set; and Type-I extreme probability, distributions were derived for the three panel sizes. The Canmar Kigoriak data were then subdivided based on contact area and a simulation was performed to derive the load distributions on subregions of the instrumented panel. Finally, a local ice load model which accounts for annual number of impacts and exposure was confirmed. -- To evaluate the strength of bow plating, three limit states (three-hinge collapse, permanent set and membrane collapse) were selected. Statistical distributions for each of the input parameters were established. The probability of failure was calculated, for each limit state using a range of plate thicknesses, frame spacings and annual numbers of impacts, using First Onler Reliability Method software. The probability of failure was approximated as a plane for each limit state and frame spacing. -- Plate thickness was optimised for minimum cost. Minimum safety levels for permanent set and membrane collapse were also specified. The objective function considered costs due to construction, aesthetics, repair and replacement. Cost due to lost use of the ship and increased weight can also be specified. These costs were considered to be specific to the vessel under consideration and hence, were considered outside the scope of the present analysis. Optimum plate thicknesses are. presented and compared with those specified by the Proposals for the Revision of the Anuic Shipping Pollution Prevention Regulations.
TypeText
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier76203919
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(16.07 MB) -- http://collections.mun.ca/PDFs/theses2/Brown_PeterW.pdf
CONTENTdm file name337518.cpd