Using multiple tuned mass dampers to control offshore wind turbine vibrations under multiple hazards

Zuo, Haoran; Bi, Kaiming; Hao, Hong

doi:10.1016/j.engstruct.2017.03.006

Cited by 200 publications

(78 citation statements)

References 43 publications

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“…It should be noted that when the TMD is utilized to the wind resistance of wind turbines, the mass ratio of nearly 2% is typical and desirable . However, when wind turbines suffer seismic excitations that have broader frequency band, the higher vibration modes are prone to be induced . Additionally, because the TMD is tuned to the first frequency of the wind turbine, once dynamic characteristics of the wind turbine alter significantly, the detuning effect tends to appear, leading to inferior vibration control effect.…”

Section: Shaking Table Test Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Up to now, numerous researches pertaining to structural control of wind turbines employing TMD have been conducted, among which four types of TMD are considered, namely passive TMD, 13,14 active TMD, 15 semi-active TMD, 16 and multiple tuned mass dampers (MTMDs). 17 Note that the damping performance of active TMD is superior over passive TMD at the expense of active power consumption. 18 As many advantages, the passive TMD provide, such as simple construction, small auxiliary mass, low cost, and no requirement on external energy supply, the passive TMD is regarded as an attractive way to reduce the adverse vibration and also to ensure the reliability of wind turbine tower.…”

Section: Introductionmentioning

confidence: 99%

“…18 However, when wind turbines suffer seismic excitations that have broader frequency band, the higher vibration modes are prone to be induced. 17 Additionally, because the TMD is tuned to the first frequency of the wind turbine, once dynamic characteristics of the wind turbine alter significantly, the detuning effect tends to appear, leading to inferior vibration control effect. It has been shown that with little increase in the mass ratio, the detuning effect can be alleviated effectively.…”

Section: Introductionmentioning

confidence: 99%

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Shaking table test on vibration control effects of a monopile offshore wind turbine with a tuned mass damper

et al. 2018

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To investigate vibration control effects of a tuned mass damper (TMD) on the monopile offshore wind turbine tower under wind‐wave excitations and seismic excitations, shaking table tests on a 1/13‐scaled test model equipped with or without TMD are implemented. The TMD device adopted in the test is a bidirectional TMD whose mass ratio and frequency ratio are properly designed. During the test, the model identification of wind turbine model is conducted via white noise sweep. Furthermore, the influence of aerodynamic damping generated by blade rotation on the dynamic responses of a monopile offshore wind turbine is analyzed. Additionally, the vibration control effects of TMD under different rotation speeds of the blades and various external excitations are intensively studied. Based on the test results, the seismic responses of a monopile offshore wind turbine attached with/without TMD are also analyzed by the finite element software ANSYS. It has been found that the results obtained by numerical simulation fit well to the results derived from the experimental tests, showing that the numerical simulation method proposed in this paper is feasible with satisfactory accuracy. Both experimental and numerical researches conducted in this work are conducive to the further application of TMD to offshore wind turbines that are situated in seismic active regions. It should be noted that the investigated time‐histories cannot give a generalized result regarding the real performance of the TMD under wind‐wave excitations. The documented results can only support an overview about the tendency of the TMD efficiency.

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Section: Shaking Table Test Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shaking table test on vibration control effects of a monopile offshore wind turbine with a tuned mass damper

et al. 2018

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“…The material damping of steel varies from 0.2% to 0.3% [61], and the upper value of 0.3% is used in the simulation. In large scale offshore wind turbines, shock absorption and vibration-control systems, which increase the damping of the wind turbine assemble, are usually adopted to reduce structural vibration [63,67,68]. However, these vibration-control systems are normally specially designed, and out of the scope of this study, and therefore were not considered.…”

Section: (3) Dampingmentioning

confidence: 99%

Seismic Fragility Analysis of Monopile Offshore Wind Turbines under Different Operational Conditions

Kang

et al. 2017

Energies

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Offshore wind turbines in seismic active areas suffer from earthquake impacts. In this study, seismic fragility analysis of a monopile offshore wind turbine considering different operational conditions was performed. A finite element model for a 5 MW monopile offshore wind turbine was developed using the OpenSees platform. The interaction between the monopile and the seabed soil was modeled as a beam-on-nonlinear-winkler-foundation (BNWF). A nonlinear time history truncated incremental dynamic analysis (TIDA) was conducted to obtain seismic responses and engineering demand parameters. Potential damage states (DSs) were defined as excessive displacement at the nacelle, rotation at the tower top, and the allowable and yield stresses at the transition piece. Fragility curves were plotted to assess the probability of exceeding different damage states. It was found that seismic responses of the wind turbine are considerably influenced by environmental wind and wave loads. Subject to earthquake motions, wind turbines in normal operation at the rated wind speed experience higher levels of probability of exceeding damage states than those in other operational conditions, i.e., in idling or operating at higher or lower wind speed conditions.

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Multi‐hazard fragility assessment of monopile offshore wind turbines under earthquake, wind and wave loads

Zhang

Risi

Sextos

2023

Earthq Engng Struct Dyn

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This study establishes a multi‐hazard probabilistic assessment framework for assessing the integrity of monopile offshore wind turbines (OWT) under the stochastic coupled effect of wind, wave and earthquake loading. The procedure deals with the entire operational range of inflow wind speed (i.e., 3–25 m/s), for which the probability of failure under multi‐hazard excitations is found to be non‐negligible. Numerical analysis is performed by implementing nonlinear finite‐element models of the OWT developed in OpenSees. The dynamic response of the OWT system under wind‐ and wave‐load combinations is individually validated against those obtained from the aero‐hydro‐servo‐elastic simulator OpenFAST. Following the Latin‐hypercube approach, a cloud‐based assessment procedure is then performed with an ensemble of 300 earthquake ground motions, from which the multi‐hazard performance of the OWT regarding the serviceability limit state (SLS) and the ultimate limit state (ULS) can be evaluated. The epistemic uncertainty associated with various loads, structural properties, and soil conditions is also accounted for. Based on this probabilistic assessment framework, the sensitivity of the resulting OWT fragility surfaces to different statistical regression methods and wind—ground motion intensity measure pairs (IM‐pairs) is further scrutinised. Regression methods are comparatively evaluated. The efficiency, practicality, proficiency and sufficiency of various IM‐pairs are examined for the purpose of assessing operating OWT multi‐hazard fragility functions. The optimum IM‐pair is then employed in a trained Gaussian Process Regression (GPR) scheme for cloud data regression to assess the multi‐hazard fragility of the system. The derived multi‐hazard fragility function shows that the contribution of seismic forces in structural demand for a design‐level earthquake is comparable to those caused by operational‐level wind and wave loads.

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Using multiple tuned mass dampers to control offshore wind turbine vibrations under multiple hazards

Cited by 200 publications

References 43 publications

Shaking table test on vibration control effects of a monopile offshore wind turbine with a tuned mass damper

Shaking table test on vibration control effects of a monopile offshore wind turbine with a tuned mass damper

Seismic Fragility Analysis of Monopile Offshore Wind Turbines under Different Operational Conditions

Multi‐hazard fragility assessment of monopile offshore wind turbines under earthquake, wind and wave loads

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