Time domain simulation of symmetric ship motions in waves
Time domain simulation of symmetric ship motions in waves
A time domain mathematical model is presented for the prediction of heave and pitch motions in regular waves. In the linear model, the fluid forces and moments acting on a vessel are expressed in terms of convolution integrals, thus accounting for fluid memory effects. The required impulse response functions are obtained from transforms of frequency domain data evaluated using a three-dimensional potential flow analysis. These are referenced to both equilibrium and body fixed axis systems. Time domain simulations are performed using equations of motion referenced to both axis systems. Comparisons with frequency domain predictions show that the numerical implementation of the model referenced to a body fixed axis system is more accurate.
Subsequently, non-linear incident wave and restoring force/moment contributions are included in the mathematical model referenced to a body fixed axis system. These contributions are accounted for by considering the instantaneous underwater portion of the hull at each time step of the simulation. Predictions obtained from this partly non-linear model, for a range of wave amplitudes, are compared to both linear predictions and experimental results for two merchant ship hull forms.
89-108
Ballard, E.J.
7f9f32f2-e814-4b8a-91cf-94aa45d0306c
Hudson, D.A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Price, W.G.
b7888f47-e3fc-46f4-9fb9-7839052ff17c
Temarel, P.
b641fc50-5c8e-4540-8820-ae6779b4b0cf
2003
Ballard, E.J.
7f9f32f2-e814-4b8a-91cf-94aa45d0306c
Hudson, D.A.
3814e08b-1993-4e78-b5a4-2598c40af8e7
Price, W.G.
b7888f47-e3fc-46f4-9fb9-7839052ff17c
Temarel, P.
b641fc50-5c8e-4540-8820-ae6779b4b0cf
Ballard, E.J., Hudson, D.A., Price, W.G. and Temarel, P.
(2003)
Time domain simulation of symmetric ship motions in waves.
Transactions of The Royal Institution of Naval Architects Part A: International Journal of Maritime Engineering, 145 (A2), .
Abstract
A time domain mathematical model is presented for the prediction of heave and pitch motions in regular waves. In the linear model, the fluid forces and moments acting on a vessel are expressed in terms of convolution integrals, thus accounting for fluid memory effects. The required impulse response functions are obtained from transforms of frequency domain data evaluated using a three-dimensional potential flow analysis. These are referenced to both equilibrium and body fixed axis systems. Time domain simulations are performed using equations of motion referenced to both axis systems. Comparisons with frequency domain predictions show that the numerical implementation of the model referenced to a body fixed axis system is more accurate.
Subsequently, non-linear incident wave and restoring force/moment contributions are included in the mathematical model referenced to a body fixed axis system. These contributions are accounted for by considering the instantaneous underwater portion of the hull at each time step of the simulation. Predictions obtained from this partly non-linear model, for a range of wave amplitudes, are compared to both linear predictions and experimental results for two merchant ship hull forms.
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Published date: 2003
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Local EPrints ID: 22505
URI: http://eprints.soton.ac.uk/id/eprint/22505
ISSN: 1479-8751
PURE UUID: 07bcf9e4-5478-427f-809f-ec795ced2e94
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Date deposited: 24 Mar 2006
Last modified: 16 Mar 2024 02:48
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E.J. Ballard
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