Dynamic response mitigation of floating wind turbine platforms using tuned liquid column dampers

Jaksic, Vesna; Wright, Christopher; Murphy, Jimmy; Afeef, C.; Ali, Shaikh Faruque; Mandic, Danilo P.; Pakrashi, Vikram

doi:10.1098/rsta.2014.0079

Cited by 47 publications

(22 citation statements)

References 28 publications

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“…waves (Jaksic et al, 2015b) for system identification or monitoring purposes. With the importance of offshore renewable energy recognised worldwide, a wide range of structural designs for wind and wave energy are extremely flexible and behave nonlinearly while in operation in the presence of high wind and wave.…”

Section: Discussion Related To Implementationmentioning

confidence: 99%

Assessment of structural nonlinearities employing extremes of dynamic responses

Pakrashi

Fitzgerald

O’Leary

et al. 2016

Journal of Vibration and Control

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Section: Discussion Related To Implementationmentioning

confidence: 99%

Assessment of structural nonlinearities employing extremes of dynamic responses

Pakrashi

Fitzgerald

O’Leary

et al. 2016

Journal of Vibration and Control

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“…Optimisation of control can then be carried out by carefully choosing the design parameters [13]. Recently, a number of studies on single and multiple TLCDs applied to onshore wind turbine towers and floating wind turbine platforms [14,15] have indicated that TLCDs may be a reasonable way to reduce wind turbine tower vibrations.…”

Section: Introductionmentioning

confidence: 99%

Mitigating the structural vibrations of wind turbines using tuned liquid column damper considering soil-structure interaction

Buckley

Watson²,

Cahill

et al. 2018

Renewable Energy

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This paper considers the potential of using a Tuned Liquid Column Damper (TLCD) to reduce structural vibrations of a wind turbine tower. The effect of TLCD on wind turbine towers, including the soil-structure interactions for a monopile foundation was modelled theoretically and scaled laboratory experiments were carried out to validate these results. The tower of the turbine is represented as an Euler beam with a set of springs at the boundary to simulate the soilstructure interaction. TLCD design was carried out using such a model and the reduction in tower vibrations due to the deployment of TLCD was then examined for various loading conditions in the frequency and the time domain. The efficiency of TLCDs for reducing structural vibrations was investigated for tuned and detuned conditions. The response of a smallscale model was simulated along with that of a full-scale turbine and parametric studies around the variations of inputs related to uncertainties were performed. Experiments were carried out on a scaled model turbine to examine the effectiveness of the TLCD. The practicalities of installing a TLCD in a full-scale turbine were examined.

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“…Therefore, there have been efforts in developing different actuation schemes for stabilization and load reduction control for floating turbines, via both passive and active control. Colwell and Basu proposed the tuned liquid column damper (TLCD), and Jaksic et al evaluated 3 combinations of multiple TLCDs. Lackner and Rotea proposed to deploy the tuned‐mass damper (TMD) within the nacelle, evaluating the performance in reducing platform pitch and fatigue load under both passive and active control configurations.…”

Section: Introductionmentioning

confidence: 99%

Active vertical vane control for stabilizing platform roll motion of floating offshore turbines

Yang

2018

Wind Energy

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For floating offshore wind turbines, control of the platform roll motion is important for performance, load, and structural stability. This paper proposes an active control strategy for stabilizing the platform roll motion of downwind wind turbine via a vertical vane installed underneath the nacelle bedplate. The aerodynamic lift induced by the vertical vane from the incoming wind renders a lateral force imposed on the tower top, which leads to a significant stabilizing torque on the platform via the tower height as moment arm. Such control authority can be manipulated by the vane pitch angle.The proposed idea is evaluated with a 5 MW turbine model combined with the Hywind platform, using the Fatigue, Aerodynamics, Structures, and Turbulence software. The vane models are implemented based on slight modification of the tail furling module in Fatigue, Aerodynamics, Structures, and Turbulence. Simulation study is performed under different feedback measurements, vane areas, airfoil designs, wind speeds, wave heights, wind directions, and wave directions. The feedback of tower-top velocity feedback is shown to be more effective than the acceleration feedback. For all cases, the variance of platform roll angle shows reduction of approximately 73% to 95%, the damage equivalent load for the tower-base side-to-side bending moment can be reduced by 20% to 61%, and the power consumption of vane actuator is up to 0.075% of the turbine power generated during the simulated periods. The proposed actuation scheme promises a low-power and high-bandwidth solution to floating offshore wind turbines roll motion stabilization, more advantageous especially for higher winds when the structural stability is of greater concern. KEYWORDS active control, airfoil, offshore floating wind turbine, platform roll, vertical vane actuator 1 | INTRODUCTION Compared with onshore wind power, offshore wind power has advantages including higher wind with less turbulence, reduced transmission cost due to proximity to load centers, and relief from the pressure of land scarcity. 1 The offshore wind turbines that have been installed so far are mostly deployed in shallow water on piles or gravity-based substructures. For water depths from 20 to 60 m, various designs of tripod and jacket structures have been proposed. 2 Visual and noise annoyance of nearshore wind turbine operation has motivated the development of deep-water Nomenclature: A=, vane area; C m =, pitching moment coefficients of airfoils; J=, the inertial moment of vertical vane; PI=, proportional-integral; P m =, power supply for vane motor; T aero =, aerodynamic torque of vertical vane; TLCD=, tuned liquid column damper; T m =, torque from vane motor; TMD=, tuned mass-spring damper; α=, angle of attack for vertical vane; ρ=, air density; θ=, pitch angle of vertical vane /journal/we 997 wind power. For deeper water, only floating substructures would be economically justifiable. 3 In addition to reaping more wind power from the advantageous offshore wind resource, the floating offshore wind tur...

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Dynamic response mitigation of floating wind turbine platforms using tuned liquid column dampers

Cited by 47 publications

References 28 publications

Assessment of structural nonlinearities employing extremes of dynamic responses

Assessment of structural nonlinearities employing extremes of dynamic responses

Mitigating the structural vibrations of wind turbines using tuned liquid column damper considering soil-structure interaction

Active vertical vane control for stabilizing platform roll motion of floating offshore turbines

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