.... sustainability platform design social responsibility sustainable development subsea system frequency turbine requirement tubular tower truss tower wave scatter diagram sea state fatigue damage tower design wind turbine natural frequency fatigue life spectrum substructure frequency range wall...

... united states government upstream oil & gas north america government social responsibility sustainable development extreme 2 frequency extreme 1 control system wind energy natural frequency nacelle acceleration reduction sustainability sub-sea system rted control energy...

... operational and extreme conditions. Statistics of each design parameter are discussed for various design load conditions. A sensitivity study of floating tower natural frequency was also carried out and discussed in both frequency and time domain to understand its impact on the mooring system response...

... spatial distribution completely coincides with the natural mode shape of the pipe system. Harmonic analysis is performed to obtain the maximum stress range at each natural frequency of the piping system. From the transfer function and pressure fluctuation spectrum, a stress range spectrum can...

... and accelerometers, have been analyzed to determine the first axial riser natural frequency and associated damping ratio using robust identification methods. Damping ratio values are presented for each data set. This effort has found a fairly consistent level of damping across the range of water depths, vessels...

... Abstract The objective of this paper was to evaluate the sensitivity of the natural frequency for an offshore wind turbine monopile in normally consolidated marine clay to different p-y models being used in practice: API RP 2GEO (2011) , which is the existing Recommended Practice for offshore...

... to wave activity at the site. Analysis of low frequency response at the riser natural frequencies indicated that the first few riser modes may have been excited by currents. It was also demonstrated that the low frequency response did not contribute significantly to fatigue life. The wellhead monitoring...

... displacement tension variation modeling & simulation wellhead fatigue spectra natural frequency riser vessel motion frequency Gryt0yr , G. , Coral , F. , Lindstad , H. B. , and Russo , M. , "Wellhead Fatigue Damage Based on Indirect Measurements," Proc. 34th...

... meters casing. In Fig. 2, the surface casing s bottom end displacement amplitude behavior versus excitation frequency is observed. The highlights are the points of resonance, which show the first three natural frequencies of the system (see Table 2). Fig. 3 shows module of amplitude behavior in all...

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... a cabled system or acoustic modem to transmit data to the surface. In addition, the significance of regional submerged currents for wellhead stress and fatigue is highlighted, as well as considerations for vibration mitigation. wellhead stress flagpole frequency prediction natural frequency bop...

... in this paper. model test amplitude frequency experimental model step riser configuration upstream oil & gas reynolds number axis offshore technology conference flexible riser coefficient current velocity natural frequency displacement vortex vibration test section Presentation...

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... represent the actual dynamic properties of each of the turbine systems at the sites. mode shape frequency otc 24240 monopile upstream oil & gas water depth criterion platform design foundation natural frequency elevation accelerometer calibration offshore technology conference...

... renewable energy module wind energy jst constraint diameter transition piece optimization problem support structure substructure natural frequency offshore wind turbine outer diameter thickness batter artificial intelligence stiffness loading configuration turbine wall thickness hub...

... vibrationsolutions are derived and solved using simple (e.g., MATLAB) programming. axial vibration vibration axial stress otc 23048 artificial intelligence viv unstable zone instability cross-flow viv amplitude fatigue analysis natural frequency ttr stability diagram tension fluctuation...

... Abstract Natural frequency monitoring of offshore platforms is a valuable tool forstructural integrity management. Online structural integrity monitoring assumeseven greater significance when platforms are highly susceptible to damage dueto environmental wave loading and fatigue processes...

... of cycle dependent soil stiffnesschange. From the series of tests conducted it was observed that the FMF of a suctioncaisson founded OWT has the potential to change under cyclic loading. Initiallyan increase in the natural frequency was observed. As other dynamic factors arekept constant this change...

... frequencies dictated by tension. The requirement for these model tests was to construct a model riser with harmonic natural frequencies, as in the full- scale, with no bending stiffness contributed by the riser cross-section. The 2.4m long model riser was designed by Professor John Chaplin and constructed...

... the systems responses to wave excitation at a range of frequencies, the systems natural frequencies, and the standard deviations of the systems motions in each degree of freedom in various wind and wave environments. This article explores the effects of coupling the wind turbine with the floating platform...