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Reliability and Accuracy of Ship Powering Performance Extrapolation
Citation
Bose, N and Molloy, S, Reliability and Accuracy of Ship Powering Performance Extrapolation, Proceedings of the First International Symposium on Marine Propulsion, 22-24 June 2009, Trondheim, Norway, pp. 97-104. ISBN 978-82-7174-263-8 (2009) [Refereed Conference Paper]
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Copyright Statement
Copyright Norwegian Marine Technology Research Institute 2009
Abstract
The aim of this paper is to discuss factors that affect the
reliability and accuracy of the ship powering prediction
process from model experiments and to conclude with
suggestions as to how the extrapolation process can be
improved. Uncertainty exists in the experiments that are
done to provide data for the ship powering performance
prediction process and in the extrapolation method itself.
Uncertainty analysis was used to address the sensitivity of
the extrapolation process to uncertainty in the inputs and as
a result to focus on those factors that contribute most to
uncertainty in the results for a ship powering estimate.
Questions are raised about the ship powering performance
prediction process including: can experimental uncertainty
be reduced; is it necessary to calculate wake fraction and
relative rotative efficiency; how can uncertainty of the
analysis method be minimised; how can frictional resistance
of a ship model be most accurately subtracted from the total
resistance; how sensitive is the powering estimate to
uncertainty in the correlation allowance. Suggestions for
improvements are made. The approach adopted is not
prescriptive, but one of questioning standard practice in
order to get practitioners to reconsider their analysis
methods with a view to achieving improvements in
accuracy.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | Ship powering performance; extrapolation; uncertainty |
Research Division: | Engineering |
Research Group: | Maritime engineering |
Research Field: | Naval architecture |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in engineering |
UTAS Author: | Bose, N (Professor Neil Bose) |
ID Code: | 59344 |
Year Published: | 2009 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2009-11-28 |
Last Modified: | 2012-03-21 |
Downloads: | 5 View Download Statistics |
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