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Giorgi, Giuseppe
Davidson, Josh
Habib, Giuseppe
Bracco, Giovanni
Mattiazzo, Giuliana
Kalmár-Nagy, Tamás
2021-08-09T08:02:00Z
2021-08-09T08:02:00Z
2020-07-09
http://hdl.handle.net/10890/15679
Mathematical models are essential for the design and control of offshore systems, to simulate the fluid–structure interactions and predict the motions and the structural loads. In the development and derivation of the models, simplifying assumptions are normally required, usually implying linear kinematics and hydrodynamics. However, while the assumption of linear, small amplitude motion fits traditional offshore problems, in normal operational conditions (it is desirable to stabilize ships, boats, and offshore platforms), large motion and potential dynamic instability may arise (e.g., harsh sea conditions). Furthermore, such nonlinearities are particularly evident in wave energy converters, as large motions are expected (and desired) to enhance power extraction. The inadequacy of linear models has led to an increasing number of publications and codes implementing nonlinear hydrodynamics. However, nonlinear kinematics has received very little attention, as few models yet consider six degrees of freedom and large rotations. This paper implements a nonlinear hydrodynamic and kinematic model for an archetypal floating structure, commonplace in offshore applications: an axisymmetric spar-buoy. The influence of nonlinear dynamics and kinematics causing coupling between modes of motion are demonstrated. The nonlinear dynamics are shown to cause parametric resonance in the roll and pitch degrees of freedom, while the nonlinear kinematics are shown to potentially cause numerical instability in the yaw degree of freedom. A case study example is presented to highlight the nonlinear dynamic and kinematic effects, and the importance of including a nominal restoring term in the yaw DoF presented.hu_HU
enhu_HU
Nonlinear Dynamic and Kinematic Model of a Spar-Buoy: Parametric Resonance and Yaw Numerical Instabilityhu_HU
Folyóiratcikkhu
Kiadói változathu_HU
Open accesshu_HU
szerzőkhu_HU
Gépészmérnöki Karhu_HU
10.3390/jmse8070504
31383676
85089266998
000557708400001
Áramlástan Tanszékhu_HU
Budapesti Műszaki és Gazdaságtudományi Egyetemhu_HU
2020-07-09
2077-1312hu_HU
7hu_HU
8hu_HU
MDPIhu_HU
Basel, Switzerlandhu_HU
Journal of Marine Science and Engineeringhu_HU
Műszaki tudományokhu_HU
nonlinear kinematicshu_HU
nonlinear dynamichu_HU
nonlinear hydrodynamicshu_HU
wave energyhu_HU
Nonlinear Froude–Krylovhu_HU
coriolis and centripetal effectshu_HU
point absorberhu_HU
floating spar platformhu_HU
parametric resonancehu_HU
Tudományos cikkhu_HU
1hu_HU
17hu_HU
Gépészeti tudományokhu_HU


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