Ship powering prediction using load varying self-propulsion tests

Molloy, Susan (2001) Ship powering prediction using load varying self-propulsion tests. Masters thesis, Memorial University of Newfoundland.

[English] PDF - Accepted Version Available under License - The 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. Download (4MB)

Abstract

A method for predicting full-scale ship power performance from model load-varying test data is presented. It has been named E2001. Although presented here for a conventional twin screw icebreaker, E2001 is also being developed as an alternative to conventional ITTC 1978 based methods for ships fitted with unconventional propulsors, including those using podded propulsion systems. The method uses the load varying tests in isolation of resistance and propeller open water tests. Values of a form factor, a resistance and a thrust deduction fraction are found from an analysis of the under/overload tests. The effects of using different friction lines are included in the analysis. A discussion of the choice of appropriate correlation coefficients is provided. A final form of the method is given for the data used. Comparisons are made between the results of the extrapolation done using both the E2001 and ITTC 1978 methods and the corresponding full-scale trials.

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