... state (ULS)) or fatigue limit (fatigue limit state) is exhausted. The focus in this paper is on the determination of extreme responses for ULS design checks, considering coupled wave and wind induced motion and structural response in harsh condition up to 14.4 m significant wave height and 49 m/s 10 min...

... from the “optimal” straight line − c x − log   a ( x = log ( η − b ) ) approximating the data tail on the transformed plot 22 . The data used to illustrate the performance of the two prediction methods discussed consist of a series of daily maximum wind speed...

...P. Agarwal; L. Manuel In the design of wind turbines—onshore or offshore—the prediction of extreme loads associated with a target return period requires statistical extrapolation from available loads data. The data required for such extrapolation are obtained by stochastic time-domain simulation...

...Dag Myrhaug; Muk Chen Ong This paper considers the effect of wave age on wind gust spectra over wind waves. Here, two wind gust spectra based on maritime data are used to serve the purpose of demonstrating the effect of wave age; the spectra according to Wills et al. (1986 “Offshore Mean Wind...

...P. Roux de Reilhac; F. Bonnefoy; P. Ferrant In the present work, we study the capabilities of a one-side segmented wavemaker to generate multidirectional sea states. We want to reproduce typical West Africa sea conditions in a rectangular basin, that is, two spectra representing swell and wind...

... partitioning bimodal wave spectra into wind-sea and swell components and then fitting a spectral function to each component, while the third assigns an average spectral shape based on the integrated spectral parameters. The partitioning methods involve separating the wave spectrum into two frequency bands...

...Se´bastien Fouques; Dag Myrhaug; Finn Gunnar Nielsen Statistical information about the joint occurrence of metocean parameters is of importance for many offshore activities. For instance, in marine operations, environmental limitations may be brought about by both wind and wave conditions. Thus...

.... Furthermore, comparisons of the empirical data with some probabilistic models often used in practice shows that none of these models is able to characterize adequately all the cases of combined sea-states examined. In fact, they might be used only in the case of wind-sea dominated sea-states with small...

... system was examined. Only vortex-induced vibrations (VIV) of a moored spar were considered for this study, although it is believed that similar active-control systems can contend equally well with low-frequency wave-drift and wind-induced motions. VIV has been selected for this demonstration due...

... 07 2003 wind ocean waves mechanical engineering Myrhaug and Slaattelid 1 (hereafter referred to as MS) considered the effects of sea roughness and atmospheric stability on the sea surface wind stress over waves, which are in local equilibrium with the wind, by using...

... are when the observed probabilities tend to be bimodal, like in the cases Ia, IIIa and Ib, where the models are not appropriate. The Naess model only gives good results for the higher wave heights in swell dominated sea states. In the cases of wind-sea dominated sea states with large intermodal...

...P. Teigen; A. Naess The paper highlights the problem of evaluating the extreme surge response of a floating, deep water structure subjected to stochastic loading from concurrent wind and waves. Additional load effects associated with ocean currents are also briefly discussed. Both long-crested...

...: S. Liu. 01 July 2001 01 October 2001 22 10 2002 marine systems engineering dynamic response optimal control control of specific variables ocean waves wind modelling It is accordingly of interest to minimize the response levels for the riser angles. One way...

...Dag Myrhaug; Olav H. Slaattelid The paper considers the effects of sea roughness and atmospheric stability on the sea surface wind stress over waves, which are in local equilibrium with the wind, by using the logarithmic boundary layer profile including a stability function, as well as adopting...

... research indicates that windsea is intensified in the presence of opposed swell, whereas numerous experiments show an attenuation of the windsea energy (see a review of some wind-wave growth studies in Hanson and Phillips 30 ). For practical purposes, it is fundamental to collect evidence that fetch laws...

...Bertrand Bobillier; Subrata Chakrabarti; Poul Christiansen Wind is an important environmental parameter that influences the design of floating offshore structures, particularly in harsh environment. Because wind spectrum is broad-banded, computation of wind load on the floating structure...