... for the phenomenon. Moreover, large frequency components, far away from the eigenfrequency cannot be neglected in the coupled load case (bichromatic) compared with that in the pure wave case. Findings in this paper provide a basic reference for the initial strength and fatigue design of the CFPSO considering coupled...

... to find freespans and line curvatures from the terrain geometry. Eigenfrequencies and mode shapes are then derived for each span type, with current velocities and variables that define span vibration characteristics and fatigue. With the presented method, only estimates of soil conditions...

... ABSTRACT The foundation stiffness under operational loads is a crucial aspect for the design of monopile foundations, as key design issues, structural natural eigenfrequencies as well as the structural fatigue damage are significantly affected. According to measurement results, the current...

...-spring model can be achieved if the p-y-curves according to the API guidelines are modified at small displacements. Furthermore, the eigenfrequency of an offshore wind turbine predicted with the initial stiffness of API p-y-curves and the modified p-y-curves are compared with in-situ measurements...

.... In the present study we only consider the simplest configuration, a top-tensioned bare riser with pinned boundary condition (Yin et al., 2018). eigenfrequency riser model strain gauge dynamic response amplitude vessel motion accelerometer vibration model test viv response test 1010 top end...

... within the jacket structure, several parameters are analyzed: eigenfrequencies, DELs, fatigue damages. Moreover, the most critical joints for fatigue design and potential spots for crack initiation are identified. Wind/wave misalignment and multi- directionality are taken into account as well. First...

... suction caisson eigenfrequency novak impedance soil layer dynamic stiffness vertical dynamic stiffness vertical vibration displacement subsea system stiffness dynamic impedance dynamic response caisson upstream oil & gas foundation numerical model case 1 st eigenfrequency...

... displacement maximum transversal displacement diameter hydraulic jet pump oliveira jr displacement clearance nonuniform shaft eigenfrequency rotor eigenmode multiphase pump twin-screw multiphase pump artificial lift system Evaluation of Transversal Displacements of the Rotor of a Twin-Screw...

... that this increase was a direct consequence of the shift of the pitch eigenfrequency for the TLP with the flexible tower to a lower value where the sum-frequency loads were almost at their maximum. It was observed with the prototype program that second-order high-frequency wave loads were big enough to trigger...

... performed at ultimate limit state (ULS) and limiting the pile inclination at serviceability limit state (SLS), the foundation stiffness contributes decisively to the overall design. As key design elements, structural eigenfrequencies as well as fatigue loading are significantly affected. Monopile support...

... & gas contribution pitch response simulation amplitude tlp pitch eigenfrequency second-order load flexibility flexible tower subsea system turbine eigenfrequency anysim rigid tlp wind energy tension-leg platform wave load renewable energy stiffness platform Comparison of Second...

... symmetric flap mode 1st turbine experimental setup mode 1st eigenfrequency drillstring design wind energy fw mode 1st three-bladed configuration test turbine configuration frequency Experimental and Numerical Study of a New Dynamic Phenomenon for Two-bladed Wind Turbines Torben Juul Larsen...

... wavelength is generally small, it is demonstrated that the indicated nonlinear effect causes parametric instability at certain ratios between the wave frequency and the eigenfrequency of the structure. This calls for caution for structures designed to avoid resonance by having eigenfrequencies below...

... multi-span section mode shape eigenfrequency free span stiffness modal analysis modal stress span midstream oil & gas seabed topography Effects of Seabed Topography on Modal Analyses of Free Spanning Pipelines Håvar A. Sollund (1) and Knut Vedeld (2) (1) Mechanics Division, Department...

... on a volume element representation of the clay and simplified model of tower. The influences of factors such as stiffness and plastic behavior of clay on eigenfrequency and static deformation of the tower are identified and discussed. Geometry Description The foundation of the tower includes a monopile...

... großmann offshore wind turbine wind energy wind turbine foundation mass coefficient calculation renewable energy coefficient stiffness turbine spectrum experiment inflow translational acceleration sea state diagonal rope gicon -tlp eigenfrequency subsea system upstream oil...

... 609 Results Below the results for the transient swing from undeformed to steady deformation are compared for the present models. Eigenfrequency For basic validation of the models, the eigenfrequencies in air are calculated with FEM and MBS. These are shown in Fig. 7. Both methods differ only...

.... Hydroelastic analysis can address the design of various floating structures and also, is a subject of research with continuous progress until now. breakwater mode shape mechanism variation module ffb eigenfrequency coefficient correspond sustainability wave frequency wave energy production...

... the design and construction of effective FSs in terms of safety, desired performance and cost is the key element for their successful implementation. application coefficient eigenfrequency numerical approach dna hydroelasticity iterative procedure subsea system pna variation structural...

... is still not considered in the standard design process and therefore still leaves potential for cost savings. eigenfrequency renewable energy control concept loading offshore wind turbine monopile support structure platform design wind turbine mudline turbine wind energy support...