Dynamic Behaviors of A Marine Riser Under Two Different Frequency Parametric Excitations

The marine risers are often subjected to parametric excitations from the fluctuation top tension. The top tension on the riser may fluctuate with multiple frequencies caused by irregular waves. In this paper, the influence between different frequency components in the top tension on the riser system...

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Bibliographic Details
Published in:China ocean engineering 2019-12, Vol.33 (6), p.704-712
Main Authors: Xie, Wu-de, Xu, Wan-hai, Zhai, Li-bin, Gao, Xi-feng, Xu, Zeng-wei
Format: Article
Language:English
Subjects:
Amplitudes
Beam theory (structures)
Coastal Sciences
Components
Computer simulation
Dynamic models
Dynamic stability
Engineering
Euler-Bernoulli beams
Excitation
Fluid- and Aerodynamics
Irregular waves
Marine & Freshwater Sciences
Numerical and Computational Physics
Oceanography
Offshore Engineering
Riser pipes
Risers
Simulation
Tension
Variation
Vibration
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Summary:The marine risers are often subjected to parametric excitations from the fluctuation top tension. The top tension on the riser may fluctuate with multiple frequencies caused by irregular waves. In this paper, the influence between different frequency components in the top tension on the riser system is theoretically simulated and analyzed. With the Euler-Bernoulli beam theory, a dynamic model for the vibrations of the riser is established. The top tension is set as fluctuating with time and it has two different frequencies. The influences from the fluctuation amplitudes, circular frequencies and phase angles of these frequency components on the riser system are analyzed in detail. When these two frequencies are fluctuating in the stable regions, the riser system may become unstable because ?1+?22On. The fluctuation amplitudes of these frequencies have little effect on the components of the vibration frequencies of the riser. For different phase angles, the stability and dynamic behaviors of the riser would be different.
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-019-0068-7