Nonlinear frequency domain analysis of flexible offshore structures using volterra series

2005 ◽  
Vol 9 (5) ◽  
pp. 391-401 ◽  
Author(s):  
Jang Sub Kwon ◽  
In Yeol Paik ◽  
Sung Pil Chang
Keyword(s):  
Frequency Domain ◽  
Volterra Series ◽  
Domain Analysis ◽  
Offshore Structures ◽  
Frequency Domain Analysis ◽  
Nonlinear Frequency

A Volterra series approach to the frequency domain analysis of non-linear viscous Burgers’ equation

2012 ◽  
Vol 70 (3) ◽  
pp. 1753-1765 ◽  
Author(s):  
L. Z. Guo ◽  
Y. Z. Guo ◽  
S. A. Billings ◽  
D. Coca ◽  
Z. Q. Lang
Keyword(s):  
Frequency Domain ◽  
Burgers Equation ◽  
Volterra Series ◽  
Domain Analysis ◽  
Frequency Domain Analysis ◽  
Non Linear

Coupled Dynamic Analysis of a Moored Spar in Random Waves and Currents (Time-Domain Versus Frequency-Domain Analysis)

1999 ◽  
Vol 121 (3) ◽  
pp. 194-200 ◽  
Author(s):  
Z. Ran ◽  
M. H. Kim ◽  
W. Zheng
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Software Package ◽  
Volterra Series ◽  
Domain Analysis ◽  
Frequency Domain Analysis ◽  
Random Waves ◽  
Mooring Lines ◽  
Drag Forces ◽  
The Time Domain

Nonlinear coupled responses of a moored spar in random waves with and without colinear currents are investigated in both time and frequency domains. The first and second-order wave forces, added mass and radiation damping, and wave drift damping are calculated from a hydrodynamics software package called WINTCOL. The total wave force time series (or spectra) are then generated in the time (or frequency) domain based on a two-term Volterra series model. The mooring dynamics are solved using the software package WINPOST, which is based on a generalized-coordinate-based finite element method. The mooring lines are attached to the platform through linear and rotational springs and dampers so that various boundary conditions can be modeled using proper spring and damping values. In the time-domain analysis, the nonlinear drag forces on the hull and mooring lines are applied at the instantaneous position. In the frequency-domain analysis, nonlinear drag forces are stochastically linearized, and solutions are obtained by an iterative procedure. The time-domain results are systematically compared with the frequency-domain results.

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