Experimental study on seismic vibration control of an offshore wind turbine with TMD considering soil liquefaction effect

Lin, Guan-Bo; Lu, Lyan Ywan; Lei, Kai Ting; Liu, Kuang‐Yen; Ko, Yung Yen; Ju, Shen-Haw

doi:10.1016/j.marstruc.2021.102961

Cited by 31 publications

(10 citation statements)

References 49 publications

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“…The equivalent linearized mass, damping, and stiffness coefficients are obtained by substituting the calculated results of expected values of Equations ( 12), ( 13), and (15) into Equations ( 9), (10), and (11), respectively, as follows:…”

Section: Optimization Of Track II Nesmentioning

confidence: 99%

“…To this end, a conceptual design of adding inerter elements into traditional TMDs was proposed to form inerter‐based TMDs 25–27 and improve the vibration control effectiveness of TMDs further by using the inherent mass amplification function of the inerter devices. In addition, the sensitivity of passive control devices (e.g., TMDs) to frequency changes of controlled structures is a serious issue 10,28 . The control effectiveness of TMD may be significantly deteriorated due to slight frequency detuning between the TMD and host structure.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with semiactive and active control techniques, 4,5 passive control methods, which do not require energy input, have been more commonly adopted to mitigate WT responses. Tuned mass dampers (TMDs), [6][7][8][9][10] tuned liquid dampers (TLDs), [11][12][13] tuned liquid column dampers (TLCDs), 14,15 rolling ball vibration absorbers, [16][17][18] pendulum TMDs, 19,20 and viscous dampers 21 have been proposed to control undesired vibrations of the towers, and their effectiveness was examined either numerically [6][7][8]14,[19][20][21] or experimentally. [9][10][11][12][13][15][16][17][18] Moreover, Larsen et al 22 used an electromagnetic shunted transducer to replace the traditional viscous dashpot in a pendulum absorber to control the wind-and sea wave-induced vibrations of the tower, and their results showed that an augmented pendulum absorber slightly improved the vibration damping effect with slightly larger damper stroke compared with the classic pendulum absorber.…”

mentioning

confidence: 99%

“…In addition, the sensitivity of passive control devices (e.g., TMDs) to frequency changes of controlled structures is a serious issue. 10,28 The control effectiveness of TMD may be significantly deteriorated due to slight frequency detuning between the TMD and host structure. However, dynamic characteristics of OWTs, such as natural frequencies and damping ratios, are inevitably altered by the following factors over their long service life given their location in aggressive marine environments: (1) discrepancies between the design and construction; (2) environmental changes, such as sea level and temperature; (3) adjustment of blade pitch and rotor yaw; (4) material property deterioration and structural damage; and (5) foundation degradation due to cyclic loads 29,30 or scouring effects.…”

mentioning

confidence: 99%

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Wind‐ and sea wave‐induced response mitigations of offshore wind turbines using track nonlinear energy sinks

Zuo

Zhang

Yuan

et al. 2022

Structural Contr & Hlth

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Summary Modern offshore wind turbines (OWTs) are constructed with increasingly long blades and slender towers to capture wind resources more effectively. Consequently, OWTs have become vulnerable to wind and sea wave excitations. Mitigations of unfavorable OWT vibrations have been extensively investigated, with the majority focusing on passive vibration control strategies with control performance sensitive to structural frequency changes. Nonlinear energy sinks (NESs) are regarded as effective vibration control methods because their broadband fashion is robust against variations in structural frequencies. A novel NES with an improved track profile that combines both second‐ and fourth‐order polynomials (Track II NES) is proposed in the present study to improve the vibration mitigation effectiveness of traditional Track I NES with a track profile of a fourth‐order polynomial only. Governing equations of a single‐degree‐of‐freedom system with Track II NES are first established, and an equivalent linearization method is adopted to optimize the track profile and damping of the Track II NES. Moreover, a detailed 3D finite element model of a representative 5‐MW OWT is developed. Control effectiveness of the Track II NES is examined under different structural stiffnesses and mean wind speeds and then compared with that of conventional tuned mass damper (TMD) and Track I NES. Numerical results showed that the Track II NES can effectively suppress displacement and acceleration responses of OWTs and outperform its counterpart Track I NES. Moreover, the Track II NES can obtain reduction ratios close to those of the TMD but with better robustness against the detuning effect.

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Section: Optimization Of Track II Nesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Wind‐ and sea wave‐induced response mitigations of offshore wind turbines using track nonlinear energy sinks

Zuo

Zhang

Yuan

et al. 2022

Structural Contr & Hlth

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“…Tuned mass damper (TMD) systems are widely used to reduce the dynamic responses of various structures to manmade and natural excitations 1–4 . Several types of TMD system have been developed on the basis of various restoring‐force mechanisms and energy dissipation principles 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Application of electromagnetic tuned mass damper with flywheels for controlling building structure vibration

Lin

2023

Earthq Engng Struct Dyn

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This study investigates a novel electromagnetic tuned mass damper with flywheels (EM‐FW‐TMD) system for reducing building structure vibration. The EM‐FW‐TMD system comprises a tuned mass damper (TMD) system with an electromagnetic (EM) damper and flywheels (FW). The EM damping coefficient and inertance of the EM‐FW‐TMD are adjustable. A prototype EM‐FW‐TMD device is fabricated and tested to validate its adjustability. Sliding‐ and pendulum‐type EM‐FW‐TMD systems with various inerter configurations are investigated. The equations of motion for single‐ and multiple‐degree‐of‐freedom structures in which the two EM‐FW‐TMD systems are installed are derived. A parameter optimization method that considers inertance is proposed for the EM‐FW‐TMD systems. The control performance of the two EM‐FW‐TMD systems is extensively compared. Furthermore, for frequency detuning, a parameter redesign method is proposed for adjusting the inertance and EM damping coefficient of both types of EM‐FW‐TMD systems; the results indicate that the detuning effect can be significantly mitigated by this retuning method.

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Strategy of scaled modeling for underwater shaking table tests on cylindrical marine structures under coupled earthquake and wave–current action: A review

Han,

Li,

Wang

et al. 2023

Earthquake Engineering and Resilience

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Marine structures located in earthquake‐prone areas may be subjected to coupled earthquake and wave–current action and the underwater shaking table (UST) model test is one of the most effective methods to investigate the dynamic responses of them. However, the strategy of scaled modeling, including the selection of similitude criterion and the implementation of it, plays an important role in the test design, and hence influences the accuracy of response predictions of the prototype. This paper presents a comprehensive review of the strategy of scaled modeling utilized in UST model tests on marine structures subjected to coupled earthquake and wave–current action. The key performance parameters of USTs in service and being built in the world are first introduced. Then, the strategies of scaled modeling adopted in existing UST model tests of bridges, offshore wind turbines, submarine pipelines, and submerged floating tunnels are summarized. Following this, the applicability of current similitude criteria for UST model tests for different research focuses is fully discussed and the specific measure to realize the similitude criteria is concluded. Finally, recommendations for future work on similitude criteria are set out, providing insights into the improvements of the applicability and accuracy of the similitude criteria for UST model tests.

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Experimental study on seismic vibration control of an offshore wind turbine with TMD considering soil liquefaction effect

Cited by 31 publications

References 49 publications

Wind‐ and sea wave‐induced response mitigations of offshore wind turbines using track nonlinear energy sinks

Wind‐ and sea wave‐induced response mitigations of offshore wind turbines using track nonlinear energy sinks

Application of electromagnetic tuned mass damper with flywheels for controlling building structure vibration

Strategy of scaled modeling for underwater shaking table tests on cylindrical marine structures under coupled earthquake and wave–current action: A review

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