Vibration suppression of offshore wind turbine foundations using tuned liquid column dampers and tuned mass dampers

Hemmati, Arash; Öterkuş, Erkan; Khorasanchi, Mahdi

doi:10.1016/j.oceaneng.2018.11.055

Cited by 63 publications

(11 citation statements)

References 30 publications

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“…However, using multiple TLCDs, no additional improvement in the structure's response was observed [137]. Moreover, a study considering the combined effect of a TLCD and a TMD installed on the nacelle was carried out by Hemmati et al [138]. They concluded that the TMD presents better performance at operational conditions and the TLCD at parked conditions, and the combined action increases the overall performance against fatigue, which prolongs the lifetime of the wind turbine.…”

Section: Tuned Liquid Column Dampermentioning

confidence: 99%

Recent Advances in Vibration Control Methods for Wind Turbine Towers

2021

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Wind power is a substantial resource to assist global efforts on the decarbonization of energy. The drive to increase capacity has led to ever-increasing blade tip heights and lightweight, slender towers. These structures are subject to a variety of environmental loads that give rise to vibrations with potentially catastrophic consequences, making the mitigation of the tower’s structural vibrations an important factor for low maintenance requirements and reduced damage risk. Recent advances in the most important vibration control methods for wind turbine towers are presented in this paper, exploring the impact of the installation environment harshness on the performance of state-of-the-art devices. An overview of the typical structural characteristics of a modern wind turbine tower is followed by a discussion of typical damages and their link to known collapse cases. Furthermore, the vibration properties of towers in harsh multi-hazard environments are presented and the typical design options are discussed. A comprehensive review of the most promising passive, active, and semi-active vibration control methods is conducted, focusing on recent advances around novel concepts and analyses of their performance under multiple environmental loads, including wind, waves, currents, and seismic excitations. The review highlights the benefits of installing structural systems in reducing the vibrational load of towers and therefore increasing their structural reliability and resilience to extreme events. It is also found that the stochastic nature of the typical tower loads remains a key issue for the design and the performance of the state-of-the-art vibration control methods.

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Section: Tuned Liquid Column Dampermentioning

confidence: 99%

Recent Advances in Vibration Control Methods for Wind Turbine Towers

2021

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“…The tuned liquid column damper (TLCD) has features like compatibility with the surrounding environment and easy maintenance requirements and costs that make it an appropriate choice for offshore structures. Colwell and Basu (2009), Dezvareh et al (2015), Bargi et al (2016), and Hemmati et al (2019) proved that the TLCD is capable of suppressing the response of fixed offshore wind turbines to wind and wave loadings. TLCDs were also found to greatly increase the fatigue life of structural elements.…”

Section: Introductionmentioning

confidence: 99%

Enhancement the Fatigue Life of Floating Breakwater Mooring System Using Tuned Liquid Column Damper

Shahrabi

Bargi

2019

Lat. Am. j. solids struct.

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Safety is a key design criterion for floating structures. A high rate of mooring accidents has been reported over the past decades. Preventing mooring line failure is a key design objective for floating breakwater systems. The mooring system comprises sets of mooring lines anchored to the seabed. These components are exposed to highly cyclic nonlinear load fluctuations induced by an irregular wave climate during their service life. DNVGL-OS-E301 classifies the mooring lines for floating breakwaters as long-term elements that should be evaluated according to the fatigue limit state. Fatigue of mooring lines needs to be monitored and evaluated to warrant the station keeping and integrity of overall system. Applying an additional control device to a floating breakwater mitigates the structural response and hence mobilized tension in mooring system. The focus of present study was to examine the effect of an additional control device on fatigue life of mooring lines for floating breakwaters. To evaluate the effect of a control device on the fatigue behavior of mooring lines, a floating breakwater was simulated with a tuned liquid column damper (TLCD) attached. A time-dependent approach based on S-N curves in conjunction with the Palmgren-Miner rule was employed to evaluate the mooring line fatigue. This paper presents a further parametric study focused on the effect of TLCD on fairlead point displacement, mobilized tension, damage rate, and fatigue life of mooring lines. The results showed that TLCD increased the fatigue life of mooring line and thus dramatically decreased the likelihood of the mooring system being damaged by fatigue. This would reduce the maintenance costs and increase the lifetime and operational safety of floating breakwater. In addition, the presented case study showed that failure probability of mooring lines against fatigue damage was also reduced and was acceptable for the safety factor defined in DNVGL-OS-E301. This proposed approach of applying a TLCD is a practical tool for designing the components of a floating breakwater more efficiently. Keywords floating breakwater (FB); tuned liquid column damper (TLCD); fatigue assessment; mooring system; S-N curves; structural control Enhancement the Fatigue Life of Floating Breakwater Mooring System Using Tuned Liquid Column Damper Mostafa Shahrabi et al.

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“…Also, these controllers are designed to regulate the rotor speed and are not designed for structural vibration/load reduction. Most work on vibration control of wind turbines use external damping devices to reduce unwanted vibrations [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. These studies present various passive, semiactive and active structural control using damping devices.…”

Section: Introductionmentioning

confidence: 99%

Multi-resolution wavelet pitch controller for spar-type floating offshore wind turbines including wave-current interactions

Sarkar

Chen

Fitzgerald

et al. 2020

Journal of Sound and Vibration

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This paper proposes a wavelet multi-resolution based individual pitch control strategy for spar-type floating offshore wind turbines (FOWTs) and investigates its performance under joint wind-wave-current loads considering the effects of wave-current interactions. A multi-resolution analysis (MRA) based wavelet controller that modifies an optimal control problem cast in linear quadratic regulator (LQR) form constrained to a band of frequency has been used in this paper. The weighting matrices of the LQ regulator are varied in different frequency bands depending on the emphasis to be placed on the response energy and control effort to minimize the cost functional of that frequency band. This formulation results in frequency band dependent controller gains that lead to a time-varying controller. Daubechies wavelet is used in the MRA based filter that ensures perfect decomposition of the time signal over a finite interval and fast numerical implementation for control application. The multi-resolution wavelet-LQR individual blade pitch controller is used to control blade out-of-plane vibrations with additional emphasis on 1P frequency of the wind turbine. The emphasis on 1P frequency along with the blade's out-of-plane natural frequency is shown to reduce aerodynamic loads corresponding to 1 st rotational frequency of the wind turbine which in turn reduces vibrations in other modes of the wind turbine. The proposed controller is simulated using a 5-MW baseline offshore wind turbine with realistic operational conditions including wave-current interactions. The controller has been proved to be effective in every analyzed met-ocean condition.

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Vibration suppression of offshore wind turbine foundations using tuned liquid column dampers and tuned mass dampers

Cited by 63 publications

References 30 publications

Recent Advances in Vibration Control Methods for Wind Turbine Towers

Recent Advances in Vibration Control Methods for Wind Turbine Towers

Enhancement the Fatigue Life of Floating Breakwater Mooring System Using Tuned Liquid Column Damper

Multi-resolution wavelet pitch controller for spar-type floating offshore wind turbines including wave-current interactions

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