This paper outlines a procedure for the derivation of the differential equations describing the free response of a heaving and pitching ship from its stationary response to random waves The coupled heave-pitch motion of a ship in random seas is modelled as a multi-dimensional Markov process. The partial differential equation describing the transition probability density function, known as the Fokker-Planck equation, for this process is derived. The Fokker-Planck equation is used to derive the random decrement equations for the coupled heave-pitch motion. The parameters in these equations are then identified using a neural network approach. The method is validated using numerical simulations and experimental results. The experimental data was obtained using an icebreaker ship model heaving and pitching in random waves. It is shown that the method produces good results when the system is lightly damped. An extension for using this method to identify couple heave-pitch motion in realistic seas is suggested.
On the identification of ship coupled heave-pitch motions using neural networks
Ocean Engineering ; 26 , 5 ; 381-400
1999
20 Seiten, 14 Bilder, 2 Tabellen, 15 Quellen
Aufsatz (Zeitschrift)
Englisch
Computation of pitch an heave motions for arbitrary ship forms
TIBKAT | 1967
|Computation of pitch and heave motions for arbitrary ship forms1
IOS Press | 1967
|Heave and pitch motions of SWATH ships
Tema Archiv | 1986
|HEAVE AND PITCH MOTIONS OF A SHIP DUE TO MOVING MASSES AND FORCES
Online Contents | 2001
|Transcritical heave and pitch motions in shallow water
Tema Archiv | 1980
|