A free-vortex wake (FVW) model is developed in this paper to analyse the unsteady aerodynamic performance of offshore floating wind turbines. A time-marching algorithm of third-order accuracy is applied in the FVW model. Owing to the complex floating platform motions, the blade inflow conditions and the positions of initial points of vortex filaments, which are different from the fixed wind tur...

Large scale offshore wind farms are relatively new infrastructures and being deployed in regions prone to earthquakes. Offshore comprise of both turbines (OWTs) balance plants (BOP) facilities, such as inter-array export cables, grid connection etc. An OWT structure can be either grounded systems (rigidly anchored the seabed) or floating (with tension legs catenary cables). OWTs dynamically-sen...

The concept of non-probabilistic reliability, which is to measure the reliability in terms of the amount of uncertainty consistent with the condition of no failure, is used to establish a new model for fatigue reliability analysis. Some of the uncertain parameters of structures are expressed as interval variables instead of random variables. In numerical example, fatigue lifetime of the tenders...

[Purpose] The present study was performed to clarify the influence of the vestibulorespiratory and peripheral reflexes on ventilation when standing on one leg. Ventilatory responses and metabolic responses under various vision and platform conditions were investigated and the responses in phases I and II were compared. [Subjects] Twenty healthy subjects were instructed to stand on one leg with ...

In the analysis of the motion of a floating body, the domains can broadly be divided into the frequency domain and the time domain. The essence of the frequency domain analysis lies in calculating the hydrodynamic coefficient from the equation of motion, which has six degrees of freedom, by applying several methods. In this research, Bureau Veritas’s “HydroStar” software was used, and the compa...

[Purpose] The purpose of this study was to examine how a leg-length discrepancy contributes to the pelvic position and spinal posture. [Subjects and Methods] A total of 20 subjects (10 males, 10 females) were examined during different artificially created leg-length inequalities (0-4 cm) using a platform. The pelvic tilt and torsion and the sagittal deviation of the spine were measured using th...

In general, rearranging the legs of a Stewart-Gough platform, i.e., changing the locations of its leg attachments, modifies the platform singularity locus in a rather unexpected way. Nevertheless, some leg rearrangements have been recently found to leave singularities invariant. Identification of such rearrangements is useful not only for the kinematic analysis of the platforms, but also as a t...

Upright stance was perturbed using sinusoidal platform rotations to see how vestibular and somatosensory information are used to control segment and intersegmental dynamics in subjects with bilateral vestibular loss (BVL) and healthy controls (C). Subjects stood with eyes closed on a rotating platform (+/-1.2 degrees) for frequencies ranging from 0.01-0.4 Hz in the presence and absence of light...

An analytical solution is derived to describe the wave-induced flow field and surge motion of a deformable platform structure controlled with fuzzy controllers in an oceanic environment. In the controller design procedure, a parallel distributed compensation PDC scheme is utilized to construct a global fuzzy logic controller by blending all local state feedback controllers. The Lyapunov method ...