Novel Self-Centering Negative Stiffness Damper Based on Combination of Shape Memory Alloy and Prepressed Springs
Publication: Journal of Aerospace Engineering
Volume 31, Issue 6
Abstract
This paper proposes a novel self-centering negative stiffness damper (SCNSD), which combines superelastic shape memory alloy (SMA) and prepressed springs in parallel for damping enhancement. A mechanical model of the damping force is established and experimental tests are conducted for verification. The influence of the negative stiffness provided by the prepressed springs is investigated by parametric analysis. A single-degree-of-freedom (SDOF) structure is used as a case to study the damping effectiveness of the proposed damper. The low limit of the negative stiffness is established, and the additional equivalent damping ratio is deduced theoretically. Frequency response under harmonic excitation is evaluated by using the average method. Numerical simulation is carried out to explore the damping effectiveness of the SCNSD for suppressing the seismic response of the SDOF structure. These numerical simulation results show that the SCNSD can achieve a larger damping ratio due to the effect of the negative stiffness, and the acceleration and displacement response of the SDOF system can be reduced remarkably.
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Acknowledgments
The study in this paper is financially supported the National Natural Science Foundation of China with Grant No. 51678198 and the National Key Research and Development Program of China with Grant No. 2016YFC0701102.
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Published In
Journal of Aerospace Engineering
Volume 31 • Issue 6 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Mar 24, 2018
Accepted: May 1, 2018
Published online: Aug 10, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 10, 2019
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