Modelling of the Vortex-Induced Motion of A Single-Column Platform with Non-Linear Mooring Stiffness Using the Coupled Wake Oscillators

A phenomenological model for predicting the vortex-induced motion (VIM) of a single-column platform with nonlinear stiffness has been proposed. The VIM model is based on the couple of the Duffing-van der Pol oscillators and the motion equations with non-linear terms. The model with liner stiffness i...

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Bibliographic Details
Published in:China ocean engineering 2019-08, Vol.33 (4), p.459-467
Main Authors: Hu, Xiao-feng, Zhang, Xin-shu, You, Yun-xiang, Duan, Jin-long
Format: Article
Language:English
Subjects:
Agreements
Amplitudes
Aspect ratio
Coastal Sciences
Computation
Engineering
Equations of motion
Fluid- and Aerodynamics
Marine & Freshwater Sciences
Movement
Nonlinear equations
Numerical and Computational Physics
Oceanography
Offshore Engineering
Oscillators
Qualitative analysis
Ratios
Simulation
Stiffness
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Summary:A phenomenological model for predicting the vortex-induced motion (VIM) of a single-column platform with nonlinear stiffness has been proposed. The VIM model is based on the couple of the Duffing-van der Pol oscillators and the motion equations with non-linear terms. The model with liner stiffness is presented for comparison and their results are compared with the experiments in order to calibrate the model. The computed results show that the predicted VIM amplitudes and periods of oscillation are in qualitative agreements with the experimental data. Compared with the results with linear stiffness, it is found that the application of non-linear stiffness causes the significant reductions in the in-line and transverse motion amplitudes. Under the non-linear stiffness constraint, the lock-in behavior is still identified at 8< U r
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-019-0043-3