Please use this identifier to cite or link to this item:
Title: Non-Gaussian random wave simulation by two-dimensional fourier transform and linear oscillator response to Morison force
Authors: Zheng, X.Y.
Moan, T.
Quek, S.T. 
Keywords: Morison force
Two-dimensional fast Fourier transform (FFT)
Wave nonlinearity
Issue Date: Nov-2007
Citation: Zheng, X.Y., Moan, T., Quek, S.T. (2007-11). Non-Gaussian random wave simulation by two-dimensional fourier transform and linear oscillator response to Morison force. Journal of Offshore Mechanics and Arctic Engineering 129 (4) : 327-334. ScholarBank@NUS Repository.
Abstract: The one-dimensional fast Fourier transform (FFT) has been applied extensively to simulate Gaussian random wave elevations and water particle kinematics. The actual sea elevations/kinematics exhibit non-Gaussian characteristics that can be represented mathematically by a second-order random wave theory. The elevations/kinematics formulations contain frequency sum and difference terms that usually lead to expensive time-domain dynamic analyses of offshore structural responses. This study aims at a direct and efficient two-dimensional FFT algorithm for simulating the frequency sum terms. For the frequency-difference terms, inverse FFT and forward FFT are implemented, respectively, across the two dimensions of the wave interaction matrix. Given specified wave conditions, the statistics of simulated elevations/kinematics compare well with not only the empirical fits but also the analytical solutions based on a modified eigenvalue/eigenvector approach, while the computational effort of simulation is very economical. In addition, the stochastic analyses in both time domain and frequency domain show that, attributable to the second-order nonlinear wave effects, the near-surface Morison force and induced linear oscillator response are more non-Gaussian than those subjected to Gaussian random waves. Copyright © 2007 by ASME.
Source Title: Journal of Offshore Mechanics and Arctic Engineering
ISSN: 08927219
DOI: 10.1115/1.2783888
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Dec 10, 2018


checked on Dec 10, 2018

Page view(s)

checked on Oct 13, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.