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- Title
Uncertainty Analysis for Calm Water Tow Tank Measurements.
- Authors
Nikolov, Margaret C.; Judge, Carolyn Q.
- Abstract
Uncertainty quantification is critical in the analysis and interpretation of experimental data. Tow-tank testing of high-speed planing craft is subject to various sources of uncertainty, both systematic and random, which impact the overall uncertainty in the estimate. This paper presents an approach for quantifying and combining the different sources of uncertainty in these types of experiments. A linear mixed-effect model is proposed to account for variability both between experimental runs and within experimental runs in the random uncertainty. Expressions for the combined uncertainty, and associated degrees of freedom, are developed. The paper offers a step-by-step guide for using the proposed method to construct confidence intervals, and shows a detailed example for a single testing condition. The results demonstrate that the proposed method provides larger estimates of random uncertainty when the withinrun variability is of a magnitude similar to the between-run variability. This translates to larger combined uncertainties--and wider confidence intervals--when the random uncertainty is a major contributor to the combined uncertainty. The paper includes estimates and associated expanded, combined uncertainties for speed, sinkage, and trim based on experimental data from high-speed model testing conducted at the U.S. Naval Academy in August 2013 and May 2014.
- Subjects
TOWING basins; MARINE equipment; SHIP hydrodynamics; HYDRODYNAMIC impact on ships; MATHEMATICAL models of hydrodynamics
- Publication
Journal of Ship Research, 2017, Vol 61, Issue 4, p177
- ISSN
0022-4502
- Publication type
Article
- DOI
10.5957/JOSR.160072