scholarly journals Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

2018 ◽  
Vol 10 (2) ◽  
pp. 99 ◽  
Author(s):  
Weixing Shi ◽  
Liangkun Wang ◽  
Zheng Lu ◽  
Hui Gao
Keyword(s):  
Eddy Current ◽  
Tuned Mass Damper ◽  
Mass Damper ◽  
Variable Damping

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 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

scholarly journals Influence of dash-pot with controllable damping coefficient on damping efficiency of TMDI

2018 ◽  
Vol 148 ◽  
pp. 02001 ◽  
Author(s):  
Mateusz Lazarek ◽  
Piotr Brzeski ◽  
Przemyslaw Perlikowski
Keyword(s):  
Maximum Amplitude ◽  
Relative Displacement ◽  
Tuned Mass Damper ◽  
Damping Coefficient ◽  
Main Body ◽  
Controlling Parameter ◽  
Linear Characteristic ◽  
Mass Damper ◽  
Variable Damping ◽  
Two Parameters

In this paper we study the dynamics of two degree freedom system, which is consist of main body and tuned mass damper with inerter (TMDI). We add the dash-pot with variable damping coefficient to TMDI to study the overall efficiency of the device. The shape of non-linear characteristic of the dash-pot is dependent on one control parameter which governs the steepness of the function and the value of damping coefficient changes according to the relative displacement or velocity between main mass and tuned mass damper. We show the two parameters diagrams showing the maximum amplitude of the main body versus frequency of excitation of main body and controlling parameter.

scholarly journals Influence of Variable Damping Coefficient on Efficiency of TMD with Inerter

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6175
Author(s):  
Piotr Brzeski ◽  
Mateusz Lazarek ◽  
Przemyslaw Perlikowski
Keyword(s):  
Oscillation Amplitude ◽  
Maximum Amplitude ◽  
Relative Displacement ◽  
Tuned Mass Damper ◽  
Damping Coefficient ◽  
Main Body ◽  
Mass Damper ◽  
Different Types ◽  
Non Linear ◽  
Variable Damping

In this paper, we study the dynamics of a two-degree freedom system consisting of the main body and tuned mass damper with inerter (TMDI). We add the dash-pot with variable damping coefficient to TMDI to study the overall efficiency of the device. We investigate different types of the non-linear characteristic of the dash-pot. We investigate devices in which damping coefficient change according to the relative displacement or the relative velocity between the damped mass and tuned mass damper. We also include in the investigation of different types of control functions. We show the two-parameter diagrams presenting the main body’s maximum amplitude versus the frequency of excitation of the damped body and different control parameter. We show how the application of a non-linear damper lets us control the main system’s oscillation amplitude.

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