... 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...

... likelihood estimation of ξ and σ ̃ u is used here ( 9 ). For our POT analyses, we therefore extract the largest peak value from each 3–4 days cluster of peak wind speed values. As already mentioned, an underlying assumption for the applicability of the POT method...

...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...

... mechanical engineering statistical analysis wind ocean waves height measurement Most work on developing probabilistic models of short-term sea state characteristics has concentrated on wind waves in single wave systems, which are appropriately described by single peaked spectra. However...

...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...

... control control of specific variables ocean waves wind modelling Several problems have been encountered during drilling operations due to excessive top and bottom risers angle response levels. For the upper part of the riser, contact between the riser pipe and the surface vessel (e.g...

...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...

... to describe only the windsea part of the spectrum, generated by the local wind, hence, they are unimodal. Furthermore, the greatest part of these studies is based on measurements on wave tanks in laboratories or in swell-free environments with well-defined fetches like lakes or sheltered coastal areas...

...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...