Vibration attenuation in wind turbines: A proposed robust pendulum pounding TMD

Chapain, Suvash; Aly, Aly Mousaad

doi:10.1016/j.engstruct.2021.111891

Cited by 39 publications

(7 citation statements)

References 64 publications

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“…Hence, the reductions in the displacement and von Mises stresses show promises to extend the lifecycle, reduce the maintenance and replacement cost, and enhance public safety. The framework developed in this study makes it possible to examine different vibration suppression systems under realistic time histories of distributed wind loads, including active, passive, semi-active, and hybrid control schemes with drift magnification connections [51,[53][54][55][56]. The proposed approach permits the investigation of the performance of other potential mitigation techniques, along with recommendations/ guidelines for implementing vibration suppression devices for future inclusion in the AASHTO standard.…”

Section: Results Of the Vibration Attenuation Studymentioning

confidence: 99%

A Framework for Vibration Attenuation in Traffic Mast Arm Structures under Wind Loads

2021

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Traffic signals and information signs play a vivid role in maintaining safe travel by guiding drivers on highways and urban roads. Traffic mast arm structures are susceptible to vibrations induced by wind loads. Fatigue-induced failure is common in these structures. However, it is crucial to ascertain the functionality of signal support structures. This paper lays the foundation for a fully computational framework to model and mitigate wind-induced vibrations in traffic lighting support structures by conducting computational fluid dynamics (CFD) simulations, dynamic modeling, and damping enhancement. We validated the CFD simulations by aerodynamic testing. The dependence of flow pattern and aerodynamic loads on Reynolds number reveals the importance of full-scale CFD with large eddy simulation for wind load estimation on mast arm structures. Distributed tuned mass dampers were created by employing available weights of lighting boxes. The results show that distributed tuned lighting boxes are effective for vibration suppression. Besides, damping enhancement can significantly reduce vibration-induced stresses and hence extend the fatigue life. The proposed mitigation technique promises to save construction costs and improve the safety of the traveling public. The procedure followed for creating time histories of wind loads integrated with finite element modeling applies to other vibration lessening techniques for potential inclusion in the AASHTO standard.

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Section: Results Of the Vibration Attenuation Studymentioning

confidence: 99%

A Framework for Vibration Attenuation in Traffic Mast Arm Structures under Wind Loads

2021

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“…For the selected mass ratio between the TMD oscillating mass and the target modal mass of the vibrating structure, these parameters can be optimized for minimum modal displacement, velocity and acceleration for harmonic and broad band excitations [2]. TMDs are widely used in footbridges [3,4] and high-rise buildings [5,6] to guarantee the required acceleration limits [7][8][9], in street bridges to provide the required level of damping [10,11], in railway bridges to avoid the loss of contact between wheels and track [12], and in flag masts and wind power stations to reduce bending vibrations [13,14].…”

Section: Introductionmentioning

confidence: 99%

Performance of Numerically Optimized Tuned Mass Damper with Inerter (TMDI)

et al. 2022

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In recent years, the Tuned Mass Damper with inerter (TMDI) has received significant attention. The inerter is defined to exert a force that is in proportion to the relative acceleration of the two inerter terminals. Here, two TMDI topologies are investigated. The conventional topology is given by the inerter being in parallel to the spring and viscous damper of the TMDI. The other topology is the serial arrangement of spring, inerter and viscous damper being in parallel to the stiffness of the mass spring oscillator of the TMDI. While the first topology intends to increase the inertial force of the TMDI, the second topology aims at producing an additional degree of freedom. The considered TMDI concepts are simulated for harmonic and random excitations, with parameters set according to those described in the literature and with numerically optimized parameters which minimize the primary structure displacement response. The classical TMD is used as a benchmark. The findings are twofold. The conventional TMDI with typical inertance ratio of 1% and the very small value of 0.02% performs significantly worse than the classical TMD with the same mass ratio. In contrast, the TMDI with an additional degree of freedom can improve the mitigation of the primary structure if the inertance ratio is set very small and if the TMDI parameters are numerically optimized.

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“…Consequently, they should be taken into account during the design of such devices. To this end, several approaches can be undertaken and among them one can find, when the aim is a single-mode control, the robust control [23][24][25][26][27] using multiple TMDs instead of using a single TMD.…”

Section: Introductionmentioning

confidence: 99%

A band‐limited reliability‐based robust multimodal optimization of tuned mass dampers

Mrabet

Ouni

Kahla

2022

Structural Contr & Hlth

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Vibrations' mitigation of linear structures, subjected to random excitations, using linear tuned mass dampers (TMDs), has been widely adopted in the field of structural dynamics. Although the TMDs are reliable and constitute a very efficient low-cost solution, their dynamic parameters should be carefully tuned in order to guarantee optimal performances. Several optimization methods can be used such as the reliability-based optimization (RBO) of the TMD parameters. Even though the efficiency of the RBO strategy is proven, its main drawback shows up when addressing a multi-degree of freedom structure. Indeed, only the targeted vibrating mode exhibiting the largest amplitude is controlled whereas the other modes, with relatively smaller vibrating magnitudes, remain uncontrolled. In the present work a new band-limited BL-RBO criterion is presented. The new criterion is based on

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Vibration attenuation in wind turbines: A proposed robust pendulum pounding TMD

Cited by 39 publications

References 64 publications

A Framework for Vibration Attenuation in Traffic Mast Arm Structures under Wind Loads

A Framework for Vibration Attenuation in Traffic Mast Arm Structures under Wind Loads

Performance of Numerically Optimized Tuned Mass Damper with Inerter (TMDI)

A band‐limited reliability‐based robust multimodal optimization of tuned mass dampers

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