Two numerical simulation models to predict large-amplitude motions of floating platforms are presented. The first method is based on the application of the relative-velocity formulation of Morison's equation for force calculations. The second method developed in this work uses the three-dimensional potential theory in time domain. In this method, both the Froude-Krylov and scattering forces are calculated by considering finite wave amplitude effects in random waves. The effect of various nonlinearities on the low-frequency motions and high-frequency tether-tension response of a tension leg platform are studied using these simulation models in conjunction with power spectral methods. The presence of current and the nonlinear drag force are observed to have a significant effect on the low-frequency motions and tether tensions.
Time-domain simulation of large-amplitude response of floating platforms
Zeitabhängige Simulation des großamplitudigen Verhaltens von treibenden Plattformen
Ocean Engineering ; 22 , 4 ; 367-385
1995
19 Seiten, 10 Bilder, 33 Quellen
Article (Journal)
English
Schwingungsanregung , Offshore-Plattform , Zeitverhalten , Hydrodynamik , mathematische Ableitung , Amplitude , Potenzial (Mathematik) , Bewegungsgleichung , Vorhersage , Wasserkraft , Wellenausbreitung , dreidimensionale Darstellung , Froude-Zahl , Nichtlinearität , Frequenzspektrum , Strömungswiderstand