Vibration control of offshore wind turbine under multiple hazards using single variable-stiffness tuned mass damper

Floating offshore wind turbines are able to access deeper waters with stronger winds, but also have more complicated dynamic behavior than fixed-bottom offshore turbines, potentially resulting in larger loads. Structural control using tuned mass dampers (TMD) is a promising method for mitigating these loads. Previous research on structural control in wind turbines has typically considered passive devices and operational conditions. In this study, the effects of a passive tuned mass damper and a semi-active tuned mass damper, located at the tower top, are analyzed and simulated for the GE Haliade 150–6MW wind turbine located on the Glosten Pelastar tension-leg platform (TLP). The system is simulated using FASTv8, the wind turbine aero-elastic wind turbine simulator developed by NREL, which includes a TMD module capable of modeling passive and semi-active devices. A pendulum-type TMD developed by ESM GmbH, which can oscillate in the fore-aft and side-side directions, is modelled with non-linear position constraints. Semi-active control is defined using an “on-off” TMD damping based on a “ground-hook” control law. Ultimate limit state (ULS) conditions with a parked rotor are simulated, for two different water depths. The results are analyzed in terms of the load reductions at the tower base, nacelle acceleration reduction, and tendon tensions for the various configurations. The impact of TMD stroke limitations and the sensitivity of the results to water depth are investigated. The results will show that structural control can reduce ULS loads in deep water configurations, but are less effective in shallow water. The dynamics of the system that cause this result will be elucidated. The results will also demonstrate that semi-active control can be an effective strategy to further reduce loads and reduce the TMD stroke.

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Dynamic modeling and vibration suppression for an offshore wind turbine with a tuned mass damper in floating platform

Applied Ocean Research ◽

10.1016/j.apor.2018.08.021 ◽

2019 ◽

Vol 83 ◽

pp. 21-29 ◽

Cited By ~ 14

Author(s):

J. Yang ◽

E.M. He ◽

Y.Q. Hu

Keyword(s):

Wind Turbine ◽

Dynamic Modeling ◽

Vibration Suppression ◽

Tuned Mass Damper ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Floating Platform ◽

Mass Damper

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Passive Control of a Pentapod Offshore Wind Turbine Under Earthquakes by Using Tuned Mass Damper

Volume 10: Ocean Renewable Energy ◽

10.1115/omae2017-61468 ◽

2017 ◽

Author(s):

Wenhua Wang ◽

Zhen Gao ◽

Xin Li ◽

Torgeir Moan ◽

Bin Wang

Keyword(s):

Wind Turbine ◽

Seismic Waves ◽

Passive Control ◽

Element Model ◽

Tuned Mass Damper ◽

Dynamic Responses ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Mass Damper ◽

And Control

The finite element model (FEM) of a pentapod offshore wind turbine (OWT) is established in the newly compiled FAST. The dynamic responses of the OWT are analyzed in detail. Further, a tuned mass damper as a passive control strategy is applied in order to reduce the OWT responses under seismic loads. The influence of the tuned mass damper (TMD) locations, mass and control frequencies on the reduction of OWT responses are investigated. A general configuration of TMD can effectively reduce the local and global responses to some degree, but due to the complexity of characteristics of the OWT structure and seismic waves, the single TMD can not obtain consistent controlling effects.

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Effect of a Passive Tuned Mass Damper on Offshore Installation of a Wind Turbine Nacelle

Volume 6A: Ocean Engineering ◽

10.1115/omae2020-18171 ◽

2020 ◽

Author(s):

Zhiyu Jiang ◽

Trond Kvia Skrudland ◽

Madjid Karimirad ◽

Constatine Machiladies ◽

Wei Shi

Keyword(s):

Wind Turbine ◽

Tuned Mass Damper ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Dynamic Link Library ◽

Natural Period ◽

Irregular Wave ◽

Mass Damper ◽

Single Mass ◽

Relative Motions

Abstract Although the installation of offshore wind turbines takes place in calm seas, successful mating of wind turbine components can be challenging due to the relative motions between the two mating parts. This work investigates the effect of a passive tuned mass damper on the mating processes of a nacelle for a 10-megawatt (MW) offshore wind turbine. A nacelle with lifting wires and a monopile with a mass damper are respectively modelled using the multibody formulation in the HAWC2 program. A single mass damper is tuned to target at the first natural period of the monopile and is coupled to the main program using a dynamic link library. Afterwards, numerical simulations were carried out in turbulent wind conditions and irregular wave conditions typical of offshore installation scenarios. Important response variables including the tower-top motions, nacelle motions, and their relative motions are examined in the analysis. By comparing the time series and response statistics, we found that the tower-top motion is more crucial to the installation process than the lifted nacelle motion. For the relative motions and velocities between the nacelle and the tower top, the tuned mass damper can reduce the short-term maximum values by more than 50% for the examined sea states with spectral period between 4 to 12 seconds. This implies that the weather window for marine operations can be expanded if the tuned mass damper is applied.

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Vibration Mitigation of the Barge-Type Offshore Wind Turbine with a Tuned Mass Damper on Floating Platform

Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University ◽

10.1051/jnwpu/20183620238 ◽

2018 ◽

Vol 36 (2) ◽

pp. 238-245 ◽

Cited By ~ 1

Author(s):

Jiajia Yang ◽

Erming He ◽

Yaqi Hu

Keyword(s):

Wind Turbine ◽

Tuned Mass Damper ◽

Equal Mass ◽

Dynamic Responses ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Floating Platform ◽

Vibration Mitigation ◽

Floating Wind Turbine ◽

Mass Damper

This paper evaluates the application of a passive control technique with a tuned mass damper on platform for the barge-type offshore wind turbine. First of all, the three degrees of freedom mathematical model for the floating wind turbine is established based on Lagrange's equations, and the Levenberg-Marquardt algorithm is adopted to estimate the parameters of the wind turbine. Then, the method of frequency tuning which is utilized in engineering projects and genetic algorithm are employed respectively to simulate the optimum parameters of the tuned mass damper. The vibration mechanism about the phase-angle difference between tuned mass damper and floating platform is analyzed. Finally, the dynamic responses of floating wind turbine with/without tuned mass damper are calculated under five typical wind and wave load cases, and the vibration mitigation effects are researched in marine environment. Partial ballast is substituted by the equal mass of tuned mass damper due to the mass of floating platform with tuned mass damper would increase obviously, which would change the design of the wind turbine, and the vibration mitigation is also simulated in five typical load cases. The results show that the suppression rate of standard deviation of platform pitch is up to 47.95%, after substituting the partial mass of ballast, the suppression rate is 50%. Therefore, the dynamic responses of the barge-type floating wind turbine would be reduced significantly when the ballast is replaced by the equal mass of the tuned mass damper on floating platform.

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