Browse by author
Lookup NU author(s): Professor Michael Woodward
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
Ship manoeuvring, like many engineering problems, requires the prediction of motion performance through time-domain simulation based on force derivatives obtained by experiment. Procedures for obtaining the experimental uncertainty in the force measurements are typically given by the relevant national metrology institutions. However, the propagation of uncertainty from force measurements through to the predicted derivatives and onward into motion performance predictions, is less well defined. This paper presents a Monte-Carlo type approach for evaluating the propagation of uncertainty from force derivatives through to predicted performance parameters. Then, using a case study together with the published results from an inter-facility bias test, the paper identifies the like sources of uncertainty. The results show that, while some experimental uncertainty is evident, the likely cause of scatter (between facilities) is systematic in nature. That is to say, the current experimental procedures are ill contrived or insufficiently defined.
Author(s): Woodward MD
Publication type: Article
Publication status: Published
Journal: Ocean Engineering
Year: 2014
Volume: 88
Pages: 598-606
Print publication date: 15/09/2014
Online publication date: 09/05/2014
Acceptance date: 05/04/2014
ISSN (print): 0029-8018
ISSN (electronic): 1873-5258
Publisher: Pergamon Press
URL: http://dx.doi.org/10.1016/j.oceaneng.2014.04.001
DOI: 10.1016/j.oceaneng.2014.04.001
Notes: Highlights •Inter-facility tests evaluated with bivariant charts show systematic uncertainty. •Previously unaccounted for Type-A uncertainty in PMM tests found to be very large. •3rd-order derivatives can be super-sensitive to small changes in 1st-order terms. •Uncertainty for 3rd-order terms CMT/PMM does not overlap, questioning equivalence. • Provides method to obtain estimate of confidence interval for manoeuvring criteria.
Altmetrics provided by Altmetric
