Ship powering prediction from isolated load-varying test data
conference contribution
posted on 2023-05-23, 16:49authored byMolloy, S, Neil Bose
A method for predicting full-scale ship powering performance from model load-varying self-propulsion test data is presented. The method uses load varying tests in isolation of resistance and/or propeller open water tests. Although presented here for a conventional twin screw icebreaker, the method is being developed as an alternative to conventional lITC 1978 based methods for ships fitted with unconventional propulsors, including those using podded propulsion systems. Values of a form factor, a resistance and a thrust deduction fraction are found from an analysis of the under/overload tests. The full scale torque and thrust coefficients are estimated from the model propeller data in the behind condition. The method is illustrated by using model test data for the Canadian R-Class icebreaker for which corresponding full-scale trials results are available. Comparisons are made of the results with an extrapolation done using the lITC 1978 method. The effects of use of different friction lines are also discussed.
History
Publication title
Proceedings of 6th Canadian Marine Hydromechanics and Structures Conference
Editors
S.M. Calisal
Department/School
Australian Maritime College
Publisher
University of British Columbia
Place of publication
British Columbia
Event title
6th Canadian Marine Hydromechanics and Structures Conference
Event Venue
Vancouver, British Columbia
Date of Event (Start Date)
2001-05-23
Date of Event (End Date)
2001-05-26
Repository Status
Restricted
Socio-economic Objectives
Oceanic processes (excl. in the Antarctic and Southern Ocean)