Heave-roll-pitch coupled nonlinear internal resonance response of a spar platform considering wave and vortex exciting loads

Li, Wei; Tang, Yougang; Liu, Liqin; Liu, Shu-Xiao; Cai, Runbo

doi:10.1007/s11802-017-3151-9

Cited by 10 publications

(1 citation statement)

References 6 publications

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“…Hong et al [38] first introduced this case study, performing modelscale tests on the floating cylinder in a wave tank. Numerous authors then investigated various aspects relating to the dynamic instability and parametric excitation of the cylinder using numerical models [8,[39][40][41][42][43][44][45]. A schematic of the cylinder is shown in Fig.…”

Section: The Floating Cylindermentioning

confidence: 99%

Parametric excitation suppression in a floating cylinder via dynamic vibration absorbers: a comparative analysis

2022

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Parametric excitation in the pitch/roll degrees of freedom (DoFs) can induce dynamic instability in floating cylinder-type structures such as spar buoys, floating offshore wind or wave energy converters. At certain frequency and amplitude ranges of the input waves, parametric coupling between the heave and pitch/roll DoFs results in undesirable large amplitude rotational motion. One possible remedy to mitigate the existence of parametric resonance is the use of dynamic vibration absorbers. Two prominent types of dynamic vibration absorbers are tuned mass dampers (TMDs) and nonlinear energy sinks (NESs), which have contrasting properties with regard to their amplitude and frequency dependencies when absorbing kinetic energy from oscillating bodies. This paper investigates the suppression of parametric resonance in floating bodies utilizing dynamic vibration absorbers, comparing the performance of TMDs against NESs for a test case considering a floating vertical cylinder. In addition to the type of dynamic vibration absorber utilized, the paper also examines the DoF which it acts on, comparing the benefits between attaching the vibration absorber to the primary (heave) DoF or the secondary (pitch) DoF. The results show that the TMD outperforms the NES and that it is more effective to attach the vibration absorber to the heave DoF when eliminating parametric resonance in the pitch DoF.

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Section: The Floating Cylindermentioning

confidence: 99%

Parametric excitation suppression in a floating cylinder via dynamic vibration absorbers: a comparative analysis

2022

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Coexisting attractors in floating body dynamics undergoing parametric resonance

2022

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This study pertains to analysing the dynamical behaviour of a floating body undergoing parametric resonances. A simple vertical cylinder, representing a classical spar-buoy, is considered, limiting its motion to heave and pitch degrees of freedom. Its geometry and mass distribution are chosen such that a 2:1 ratio of heave to pitch/roll natural frequency makes the spar-buoy prone to parametric resonance. The system is then studied by the shooting method, combined with a pseudo-arclength continuation, and the harmonic balance procedure. Results show that an extensive bistable region exists, where stable parametric resonance coexists with a regular resonance response. The analysis also unveiled the existence of stable quasiperiodic motions existing in correspondence of both pitch and heave resonance. Results are qualitatively validated using a model based on the explicit nonlinear Froude–Krylov force calculation.

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Numerical analysis of pitch and rolling motions of trimaran in oblique waves

Gong

et al. 2021

J Mar Sci Technol

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Heave-roll-pitch coupled nonlinear internal resonance response of a spar platform considering wave and vortex exciting loads

Cited by 10 publications

References 6 publications

Parametric excitation suppression in a floating cylinder via dynamic vibration absorbers: a comparative analysis

Parametric excitation suppression in a floating cylinder via dynamic vibration absorbers: a comparative analysis

Coexisting attractors in floating body dynamics undergoing parametric resonance

Numerical analysis of pitch and rolling motions of trimaran in oblique waves

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