Experimental Study on Passive Negative Stiffness Damper for Cable Vibration Mitigation
Publication: Journal of Engineering Mechanics
Volume 143, Issue 9
Abstract
Stay cables are vulnerable to excessive vibration because of their inherently low damping properties. Described in this paper is an experimental investigation of the vibration control performance due to passive negative stiffness dampers (NSDs) installed on a scaled stay cable model. The passive NSD used in the experiment was composed of a viscous damper and a magnetic negative stiffness spring with an adjustable stiffness coefficient installed close to one cable end in the transverse direction. In general, the passive NSD performed much more effectively than conventional viscous dampers in mitigating the vibration of the stay cable. As the negative stiffness strength increased, the cable responses under various dynamic loadings became smaller, thus indicating that high damping had been added to the stay cable. A damping ratio higher than 10% was obtained in the cable vibration tests. The flexural rigidity of the stay cable is a parameter often overlooked. However, after the installation of a passive NSD, this was found to be of importance. The actual influence of flexural rigidity depends on the negative stiffness coefficient, the damper location, and the boundary condition of the stay cable. Numerical simulation results taking account of the flexural rigidity and boundary conditions agreed well with the experimental results.
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Acknowledgments
The authors are grateful for the financial support of the Research Grants Council of Hong Kong through the GRF grant (Project No. PolyU 152222/14E) and the Innovation and Technology Commission of Hong Kong through an ITF grant (Project No. ITS/344/14). The findings and opinions expressed in this paper are solely those of the authors and not necessarily the views of the sponsors.
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©2017 American Society of Civil Engineers.
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Received: Aug 5, 2016
Accepted: Feb 17, 2017
Published online: May 11, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 11, 2017
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