Effect of stochastic parametric noise on vortex induced vibrations

Aswathy, M; Sarkar, Saswati

doi:10.1016/j.ijmecsci.2019.01.039

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…This intricate dance of forces may, in certain cases, induce an undesirable outcome known as Limit Cycle Oscillations (LCOs), which can lead to structural fatigue and, in severe instances, catastrophic failure [4]. Much interest has surged in understanding the profound impact of parametric noise in engineering systems [5,6]. Parametric noise is recognized for its ability to induce transformative changes in the dynamic behavior of complex systems, often taking them into previously uncharted territories.…”

Section: Introductionmentioning

confidence: 99%

Stochastic Response of an Airfoil and Its Effects on Lco’s Behavior Under Stall Flutter Regime

KETSEAS

2024

ijmscs

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In this work, we investigate the effect of noise on a classical two degree-of-freedom pitch-plunge aeroelastic system. The inlet velocity of the flow is modelled as a stochastically varying parameter by the Ornstein-Uhlenbeck (OU) stochastic process. The system is a 2D airfoil and the elastic problem is simulated using linear springs. We study the manifestation of Limit Cycle Oscillations that corresponds to the varying fluid velocity under the dynamic stall regime. I aim to delve into the unexplored facets of the classical pitch-plunge aeroelastic system, seeking a comprehensive understanding of how parametric noise influences the occurrence of LCO and expands the boundaries of its known behavior.

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Section: Introductionmentioning

confidence: 99%

Stochastic Response of an Airfoil and Its Effects on Lco’s Behavior Under Stall Flutter Regime

KETSEAS

2024

ijmscs

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“…The steady ocean current is often regarded as the dominant factor affecting the VIV of risers and has been investigated in previous studies [7][8][9][10]. Steady shear flow is commonly used to characterize the spatial variation in ocean currents.…”

Section: Introductionmentioning

confidence: 99%

Coupling Effects of a Top-Hinged Buoyancy Can on the Vortex-Induced Vibration of a Riser Model in Currents and Waves

Yu,

Zhang,

Zhang

2024

JMSE

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In order to investigate the effects of the top-end dynamic boundary of risers caused by floater motions on their vortex-induced vibration (VIV) characteristics, a combined model comprising a buoyancy can with a relatively simple structural form and a riser is taken as the research object in the present study. The aspect ratios of the buoyancy can and the riser model are 5.37 and 250, respectively. A set of experimental devices is designed to support the VIV test of the riser with a dynamic boundary stimulating the vortex-induced motion (VIM) of the buoyancy can under different uniform flow and regular wave conditions. Several data processing methods are applied in the model test, i.e., mode superposition, Euler angle conversion, band pass filter, fast Fourier transform, and wavelet transform. Based on the testing results, the effect of low-frequency VIM on the high-frequency VIV of the riser is discussed in relation to a single current, a single wave, and a combined wave and current. It is found that the coupling effect of VIM on the riser VIV presents certain orthogonal features at low current velocities. The effect of the cross-flow VIM component on VIV is far more prominent than that of its counterpart, the in-line VIM, with increasing flow velocity. The VIM in the combined wave–current condition significantly enhances the modulation of vibration amplitude and frequency, resulting in larger fluctuation peaks of vibration response and further increasing the risk of VIV fatigue.

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“…When the frequency of the vortex shedding is close to the natural frequency of the riser structure, the vortex discharge process will be controlled by the vibration of the structure, leading to a "lock-in" [1,2]. Occurrence of this lock-in will cause violent riser vibration and a steep amplitude rise, greatly exacerbating the fatigue damage to the riser [3,4]. Recently, many studies have been reported on VIV.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Vortex Induced Vibration of Marine Risers with Different Wall Thicknesses

Zhong

Feng

Liu

et al. 2022

J. Phys.: Conf. Ser.

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In this paper, the vortex-induced vibration experiment of the risers with different wall thicknesses in wave-flow combined water flume was carried out. The dynamic strain sensing technology was adopted. The sensitivity and micro evolution pattern of riser VIV response relative to wall thickness were examined by varying the wall thickness of various riser models, comparing the dimensionless root mean square of strain, vibration frequencies and trajectories by varying different wall thicknesses of the risers. The results indicate that the wall thickness does not have a large influence on the Strouhal numbers of the vibration of the risers, which are always around 0.18; the larger the wall thickness is, the earlier the lock-in region is jumped out, as wall thickness increases, the outflow velocity corresponding to the occurrence of an “8” or oblique “8” shape vibration trajectory continues to delay, and the velocity range for such trajectories gradually narrows.

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Effect of stochastic parametric noise on vortex induced vibrations

Cited by 15 publications

References 33 publications

Stochastic Response of an Airfoil and Its Effects on Lco’s Behavior Under Stall Flutter Regime

Stochastic Response of an Airfoil and Its Effects on Lco’s Behavior Under Stall Flutter Regime

Coupling Effects of a Top-Hinged Buoyancy Can on the Vortex-Induced Vibration of a Riser Model in Currents and Waves

Experimental Investigation on Vortex Induced Vibration of Marine Risers with Different Wall Thicknesses

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