Vibration control of floating offshore wind turbine using semi-active liquid column gas damper

Nazokkar, Ali; Dezvareh, Reza

doi:10.1016/j.oceaneng.2022.112574

Cited by 18 publications

(7 citation statements)

References 19 publications

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“…Generally, the tower of the FOWT can exceed 100 m in height. Even small pitch motions can cause a critical dynamic effect, leading to worse tower excursions [6]. The results of Fig.…”

Section: Discussionmentioning

confidence: 86%

“…In general, the FOWT presents a significant challenge towards motion stabilization due to the complex environmental loads, including wave, wind, and current loads and the increasing size. These forces can cause undesirable high and low order motions [6]. The wave loads, including second-order wave loads, could excite the platform pitch resonance, which could cause structural failures [7].…”

Section: Introductionmentioning

confidence: 99%

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Aero-Hydrodynamic Studies of a 15 MW Semi-Submersible FOWT to Assess the Suitability of the Inclusion of a Damper System

Gao,

Zhao,

Johanning

et al. 2023

ASME 2023 5th International Offshore Wind Technical Conference

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Floating offshore wind turbines can exploit the high energy density experienced in offshore environments, with turbines now reaching up to 15 MW in size. However, given the larger size of these turbines and the severe offshore environment, there remains significant challenges in motion stabilization. To overcome these challenges, the inclusion of a damper system could be considered to reduce motions. This paper conducts a numerical dynamic analysis of a 15 MW semi-submersible floating offshore wind turbine under a range of environmental conditions, informing the design criteria for such a damper system. The study presents the findings under different environmental loading conditions. In the first instance, the time-domain results of hydrodynamic study were used to determine the dominant characteristics. The initial study identified the pitch motion of main concern. The simulations were carried out under wave-only and wind-wave loading. In the wave-only conditions study, excitation modes were observed at both the eigenfrequency and excitation frequency, dependent on wave conditions. When the wind loads were introduced, a large mean pitch offset and amplitude relative to the mean offset were observed. Within the discussion, a dual damper system is suggested to increase the stability of the platform.

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“…Generally, the tower of the FOWT can exceed 100 m in height. Even small pitch motions can cause a critical dynamic effect, leading to worse tower excursions [6]. The results of Fig.…”

Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Aero-Hydrodynamic Studies of a 15 MW Semi-Submersible FOWT to Assess the Suitability of the Inclusion of a Damper System

Gao,

Zhao,

Johanning

et al. 2023

ASME 2023 5th International Offshore Wind Technical Conference

View full text Add to dashboard Cite

show abstract

“…The vibration control methods commonly used in engineering are mainly categorized into these three types of methods: passive control [1,2], semi-active control [3,4], and active control [5,6]. As typically used passive vibration isolation devices, rubber vibration isolators have the advantages of a simple structure, absorbing a substantial amount of energy, coming in various forms, and requiring no additional energy input, among other things, and are widely used in engineering.…”

Section: Introductionmentioning

confidence: 99%

Vibration Isolation Performance of a Constrained Damping Base for a High-Pressure Plunger Pump

Zheng,

Wang,

Song

et al. 2024

JMSE

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Based on the effect of damped shear deformation on energy dissipation, a new constrained damping base for a polymer injection platform deck is proposed to reduce the excessive vibrations caused when multiple plunger pumps are jointly operated. A model for analyzing the vibration response of an I-beam-constrained damping base for a polymer injection platform with multiple plunger pumps was established using Abaqus 6.14 software and compared with rigid base and traditional rubber vibration isolators in terms of its vibration isolation performance. Furthermore, the effects of the damping material’s loss factor, the thickness of the damping layer, and the number of expansion layers on the vibration isolation characteristics of the constrained damping base were explored. This study shows that, with an increase in the damping material’s loss factor, the thickness of the damping layer and the number of extended layers, the vibration isolation performance of the constrained damping base is gradually enhanced. When the damping material’s loss factor is 1.0, the thickness of the damping layer is 20 mm, and the number of extended layers is 3, the constrained damping base’s vibration damping effect is optimized, and its vibration isolation rate becomes as high as 46.63%, which can significantly reduce the vibration response of the polymer injection platform.

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“…[7] studied and analyzed wind turbine vibration and stress harmonics under rotating excitation airflow by using ANSYS harmonic response analysis, but the effect of centrifugal load was not taken into account. Nazokkar et al [8] used variable head loss coefficients and variable frequencies, as well as DBG, VBG and Bang-Bang algorithms. To investigate the effect of a semi-active liquid column gas damper (SALCGD) on the control of FOWT vibration under different wind and wave loads.…”

Section: Introductionmentioning

confidence: 99%

Influence of changes in tip structure on wind wheel vibration characteristics under wind wheel-tower coupling

Dai,

Luo,

Cai

et al. 2024

J. vibroeng.

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This study conducted modal and vibration-characteristic tests using transient excitation and spectrum analysis methods to find the variation law of vibration characteristics of wind wheels with bifurcated tip structures as compared to wind wheels with unmodified tips when the coupling between a wind wheel and its tower is considered. Additionally, a finite element analysis was used to calculate the mechanical characteristics of wind power manoeuvres. The following are the major results of this study. As compared to the non-trailer state, the coupling action of the wind wheel and the tower reduced the static frequency of the unmodified wind wheel and the bifurcated blade tip structure wind wheel under the trailer state. The static frequency of the bifurcated blade tip structure wind wheel under the coupling action decreases more significantly. Compared with the single wind wheel which is not affected by coupling, the dynamic frequency of the whole machine decreases after being affected by coupling, and the bifurcated blade structure has less influence on the coupling effect. Compared with the non-trailer state, the dynamic frequency curves of the two blade tip structure wind wheels in the trailer state decrease, the speed range in the resonance area is shortened, and the corresponding speed in the resonance area is reduced. The results of this study provide data support and design reference for reliable design of wind turbines.

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Vibration control of floating offshore wind turbine using semi-active liquid column gas damper

Cited by 18 publications

References 19 publications

Aero-Hydrodynamic Studies of a 15 MW Semi-Submersible FOWT to Assess the Suitability of the Inclusion of a Damper System

Aero-Hydrodynamic Studies of a 15 MW Semi-Submersible FOWT to Assess the Suitability of the Inclusion of a Damper System

Vibration Isolation Performance of a Constrained Damping Base for a High-Pressure Plunger Pump

Influence of changes in tip structure on wind wheel vibration characteristics under wind wheel-tower coupling

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