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Sustainability 2018, 10(1), 99; https://doi.org/10.3390/su10010099

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

1
Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China
2
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
*
Author to whom correspondence should be addressed.
Received: 24 November 2017 / Revised: 27 December 2017 / Accepted: 30 December 2017 / Published: 3 January 2018
(This article belongs to the Section Sustainable Engineering and Science)
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Abstract

Tuned mass damper (TMD) is a widely used vibration control device, consisting of a mass, some springs and damping elements. Viscous damper is mostly used as a damping element; however, it has many unsustainable problems, e.g., poor durability, sensitive to the change of temperature, difficult to adjust the damping, oil leakage etc. In this paper, a new sustainable adaptive-passive eddy current tuned mass damper (ECTMD) with variable damping, which is very easy to be further upgraded to a semi-active one, is proposed. Four important parameters, e.g., adsorption position of permanent magnets, thickness of the conductive plate, thickness of the extra steel plate and the air gap between permanent magnets and the conductive plate are investigated by a parametric study. Two new evaluation indexes are put forward to indicate the damping mechanism of the proposed device. The relationship between effective damping coefficient and air gap is fitted through a quadratic function. Then, the corresponding design method of the proposed adaptive–passive ECTMD is presented. At last, the previous adaptive–passive ECTMD is upgraded to a semi-active one, which can adjust its eddy current damping through adjusting its air gap in real-time, based on the linear-quadratic-Gaussian algorithm. The effectiveness of semi-active ECTMD is evaluated through harmonic excitations and human-induced excitations. The results show that the semi-active ECTMD with variable damping has a better vibration control effect than the optimized passive one. View Full-Text
Keywords: eddy current; tuned mass damper; adaptive-passive control; variable damping; linear-quadratic-Gaussian algorithm; semi-active control; human-induced vibration eddy current; tuned mass damper; adaptive-passive control; variable damping; linear-quadratic-Gaussian algorithm; semi-active control; human-induced vibration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shi, W.; Wang, L.; Lu, Z.; Gao, H. Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping. Sustainability 2018, 10, 99.

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