Sea state estimated from ship motions by a statistical approach


Johnson, M.C. and Wilson, P.A. (2005) Sea state estimated from ship motions by a statistical approach. Transactions of The Royal Institution of Naval Architects Part A: International Journal of Maritime Engineering, 147, 35-51. (doi:10.3940/rina.ijme.2005.a1.050161).

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Description/Abstract

In theory, a sea wave spectrum is calculable given the ship motions in the seaway and its motion transfer functions. In
practice, the complex nature of sea waves, and the influence of ship speed and heading relative to the waves, makes an
analytical solution extremely difficult. This paper considers the problem from a purely statistical point of view with the aid of an extensive set of seakeeping trials results. Multiple linear regression is used to deduce the relationship between the RMS ship motions in five degrees of freedom, and the significant wave height measured by a waverider buoy. It is shown that the significant height may be estimated with around 10% error by this method for a wide range of conditions. A test with ‘blind’ data confirms that the approach provides a robust and successful calculation.

Item Type: Article
Additional Information: Part A of the Transactions of The Royal Institution of Naval Architects. Reference number IJME0501_61
ISSNs: 123456X (print)
Related URLs:
Subjects: V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
H Social Sciences > HA Statistics
V Naval Science > V Naval Science (General)
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
University Structure - Pre August 2011 > School of Engineering Sciences > Fluid-Structure Interactions
ePrint ID: 23191
Date Deposited: 15 Mar 2006
Last Modified: 27 Mar 2014 18:12
URI: http://eprints.soton.ac.uk/id/eprint/23191

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