... assessment of this WEC device under metocean conditions present at the PacWave site. The WEC system was modeled using the hydrodynamic package OrcaFlex, over a range of regular and irregular sea-states of varying wave height and period. Four optimization steps were made to the model, altering parameters...

... is compared with the expected loads from the global analysis. The local model is simulated stepwise with 0 - 28 broken wires and indicated a reduction of 83% in allowable axial load with 25 broken wires. The results were combined with global simulations considering different sea states to provide insights...

... For all units a range of metocean conditions were analysed, to cover all the sea states that a TAM unit is expected to operate in, limited by the 100-year contour for Haltenbanken. The analysis was also caried out for shallow, intermediate, and deep water (90m, 150m and 300m) and all...

... responses considering two sea states (Hs = 2.0 and 2.5 m / Tp = 12.5s) and different headings from 0° to 45°. The results are then post-processed to calculate the statistics of top tension for 20-minutes time intervals and assess its correlation with FPSO motion (Heave, Pitch, Roll and Heave Rate). Finally...

... Abstract Environmental conditions cover natural phenomena, which may contribute to overloading and fatigue damage. This paper is describing a method implemented for modelling and analysis of environmental conditions and loads on offshore renewables. Sea states are described by irregular wave...

... of the encountered sea states. The objective of this paper is to use in-situ measurements as a reference for evaluating the accuracy of spectral fatigue analysis and to investigate the influence of wave energy description on the fatigue assessment. Structural health monitoring systems have been increasingly used...

... available parametrized equations of the JONSWAP spectra in order to verify their applications for easing the application of the GA model. The modeled results demonstrated the capability of the GA model to find the best alpha and gamma values of the spectra for normal and extreme sea state conditions...

... mooring system design against a polymer mooring component solution, undertaking dynamic analysis of the mooring systems across multiple sea states (including ultimate limit states, fatigue limit states and accidental limit states). The Aqua Ventus platform is modelled in Orcaflex, with multiple mooring...

... simulation turbine wind energy sea state survival condition reduced-draft spar capex classic spar renewable energy spar subsea system installation capex breakdown ballast model basin offshore technology conference marine operation wind turbine Desmond , C. , Ebbenen .M...

... extension ballast right environmental condition sea state hurricane condition riser response full scale offshore technology conference hull model elevation bulwark upstream oil & gas diameter Vidic-Perunovic , J , and Head , B ( 2013 ). Novel hull concepts address...

... (EVA). Extreme Value Analysis being essential for structural design, it is necessary to explore new methodologies. The spatial method presented in this article is based on the Regional Frequency Analysis (RFA), adapted to hurricane-generated sea states. The goal is to increase the size of the sample...

... air gap analysis based on what has been considered industry practice and the new OTG-13 practice will be performed and compared with the aim of assessing the short term impact to the industry. linearization sea state bulkhead pinkster contribution upwell guideline future design practice...

... for this project highlighted many of these areas and highlighted areas in which rules require development and careful interpretation. sov service operation vessel gangway renewable energy upstream oil & gas accommodation subsea system requirement sea state drilling equipment configuration...

... is irregular. Random waves for each sea state and direction lead to different structural responses. These structural responses will be formulated as stresses change in time or frequency domains. Typically, stress spectrum in frequency domain will be used in Spectral fatigue assessment. The methodology...

... to install 9 process modules, in addition to a number of test lifts. Experiences and comparison of logged results with analysis results will be presented in later sections of this paper. Design Overview - SHS The 420t Special Handling System (SHS) is designed to handle heavy modules in sea-state up to Hs...

... be calculated for each of a large number of directional sea states, a considerable computational burden. However, it might be possible to identify a representative subset of directional sea states for vessel motion and subsequent riser stress analysis, such that estimated fatigue characteristics (from the full...

... that represent different sea states of the proposed location for the full scale prototype. In numerical simulations the dynamic behavior of the TLP under linked hydrodynamic and aerodynamic loading is taken into account also regarding different geometric configurations of the mooring line system and various...

...-commissioning activity sea state plastic pre-commissioning operation ancillary equipment completion installation and operations Lee , Y.-L. , Pan , J. , Hathaway , R. et al . Fatigue Testing and Analysis: Theory and Practice . Burlington, Massachusetts : Elsevier Butterworh...

... areas. Secondly, long term distributions of maximum wave height ( H max ) crest elevation ( C max ) are derived following the storm event based approach. Thirdly, short term distribution of wave period conditional on the large individual wave height in a sea state is given by multiple regressions...

... diffraction program based on first order panel method Selection of the a priori most unfavorable sea states regarding fatigue life assuming that the stress distribution at the TZD is directly related to the wave vertical motions (displacements) at the risers attachment points Generation of time series...