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, pp. 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
Digital Object Identifier (DOI): doi:10.3940/rina.ijme.2005.a1.050161
Additional Information: Part A of the Transactions of The Royal Institution of Naval Architects. Reference number IJME0501_61
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Organisations: Fluid Structure Interactions Group
ePrint ID: 23191
Date :
Date Event
2005Published
Date Deposited: 15 Mar 2006
Last Modified: 16 Apr 2017 22:46
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/23191

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