Improving performance of a super tall building using a new eddy-current tuned mass damper

2016 ◽  
Vol 24 (3) ◽  
pp. e1882 ◽  
Author(s):  
Xilin Lu ◽  
Qi Zhang ◽  
Dagen Weng ◽  
Zhiguang Zhou ◽  
Shanshan Wang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Tuned Mass Damper ◽  
Tall Building ◽  
Mass Damper

scholarly journals Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3319 ◽  
Author(s):  
Jijian Lian ◽  
Yue Zhao ◽  
Chong Lian ◽  
Haijun Wang ◽  
Xiaofeng Dong ◽  
...  
Keyword(s):  
Eddy Current ◽  
Wind Farm ◽  
Permanent Magnets ◽  
Tuned Mass Damper ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Small Scale ◽  
Vibration Mitigation ◽  
Mass Damper ◽  
Extreme Winds

Offshore wind turbine (OWT) structures are highly sensitive to complex ambient excitations, especially extreme winds. To mitigate the vibrations of OWT structures under windstorm or typhoon conditions, a new eddy current with tuned mass damper (EC-TMD) system that combines the advantages of the eddy current damper and the tuned mass damper is proposed to install at the top of them. In the present study, the electromagnetic theory is applied to estimate the damping feature of the eddy current within the EC-TMD system. Then, the effectiveness of the EC-TMD system for vibration mitigation is demonstrated by small-scale tests. Furthermore, the EC-TMD system is used to alleviate structural vibrations of the OWT supported by composite bucket foundations (CBF) under extreme winds at the Xiangshui Wind Farm of China. It is found that the damping of the EC-TMD system can be ideally treated as having linear viscous damping characteristics, which are influenced by the gaps between the permanent magnets and the conductive materials as well as the permanent magnet layouts. Meanwhile, the RMS values of displacements of the OWT structure can be mitigated by 16% to 28%, and the acceleration can also be reduced significantly. Therefore, the excellent vibration-reducing performance of the EC-TMD system is confirmed, which provides meaningful guidance for application in the practical engineering of OWTs.

scholarly journals Performance of TMDI for Tall Building Damping

Actuators ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 139
Author(s):  
Felix Weber ◽  
Peter Huber ◽  
Fredrik Borchsenius ◽  
Christian Braun
Keyword(s):  
Mass Matrix ◽  
Vibration Reduction ◽  
Tuned Mass Damper ◽  
Tall Building ◽  
Realistic Case ◽  
Absolute Acceleration ◽  
The Earth ◽  
Mass Damper ◽  
The Absolute ◽  
Bending Modes

This study investigates the vibration reduction of tall wind-excited buildings using a tuned mass damper (TMD) with an inerter (TMDI). The performance of the TMDI is computed as a function of the floor to which the inerter is grounded as this parameter strongly influences the vibration reduction of the building and for the case when the inerter is grounded to the earth whereby the absolute acceleration of the corresponding inerter terminal is zero. Simulations are made for broadband and harmonic excitations of the first three bending modes, and the conventional TMD is used as a benchmark. It is found that the inerter performs best when grounded to the earth because, then, the inerter force is in proportion to the absolute acceleration of only the pendulum mass, but not to the relative acceleration of the two inerter terminals, which is demonstrated by the mass matrix. However, if the inerter is grounded to a floor below the pendulum mass, the TMDI only outperforms the TMD if the inerter is grounded to a floor within approximately the first third of the building’s height. For the most realistic case, where the inerter is grounded to a floor in the vicinity of the pendulum mass, the TMDI performs far worse than the classical TMD.

scholarly journals Experimental Study on Robustness of an Eddy Current-Tuned Mass Damper

2017 ◽  
Vol 7 (9) ◽  
pp. 895 ◽  
Author(s):  
Junda Chen ◽  
Guangtao Lu ◽  
Yourong Li ◽  
Tao Wang ◽  
Wenxi Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Eddy Current ◽  
Tuned Mass Damper ◽  
Mass Damper

Critical mode control of a wind-loaded tall building using an active tuned mass damper

1997 ◽  
Vol 19 (10) ◽  
pp. 834-842 ◽  
Author(s):  
L.E. Mackriell ◽  
K.C.S. Kwok ◽  
B. Samali
Keyword(s):  
Tuned Mass Damper ◽  
Tall Building ◽  
Critical Mode ◽  
Mode Control ◽  
Mass Damper

scholarly journals LQG Control of Along-Wind Response of a Tall Building with an ATMD

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ki-Pyo You ◽  
Jang-Youl You ◽  
Young-Moon Kim
Keyword(s):  
Damping Ratio ◽  
Tall Buildings ◽  
Tuned Mass Damper ◽  
Wind Load ◽  
Tall Building ◽  
Structural Safety ◽  
Design Parameters ◽  
Random Load ◽  
Mass Damper ◽  
Wind Response

Modern tall buildings use lighter construction materials that have high strength and less stiffness and are more flexible. Although this results in the improvement of structural safety, excessive wind-induced excitations could lead to occupant discomfort. The optimal control law of a linear quadratic Gaussian (LQG) controller with an active tuned mass damper (ATMD) is used for reducing the along-wind response of a tall building. ATMD consists of a second mass with optimum parameters for tuning frequency and damping ratio of the tuned mass damper (TMD), under the stationary random load, was used. A fluctuating along-wind load, acting on a tall building, was treated as a stationary Gaussian white noise and was simulated numerically, in the time domain, using the along-wind load spectra proposed by G. Solari in 1993. Using this simulated wind load, it was possible to calculate the along-wind responses of a tall building (with and without the ATMD), using an LQG controller. Comparing the RMS (root mean square) response revealed that the numerically simulated along-wind responses, without ATMD, are a good approximation to the closed form response, and that the reduced responses with ATMD and LQG controller were estimated by varying the values of control design parameters.

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