Performance Comparison between Passive Negative-Stiffness Dampers and Active Control in Cable Vibration Mitigation
Publication: Journal of Bridge Engineering
Volume 22, Issue 9
Abstract
The installation of dampers close to cable anchorages is a common approach for stay-cable vibration mitigation. Inspired by the force-deformation relationship produced by actively controlled dampers, passive negative-stiffness dampers (NSDs) were proposed for stay cables in the past to achieve excellent vibration-control performance. However, a systematic comparison between passive NSDs and active control in cable vibration mitigation has rarely been reported in literature. This paper systematically compares vibration mitigation performances of a passive NSD to the performance of two active control methods, linear quadratic regulator (LQR) and output feedback control. The comparison indicates that a passive NSD can offer a stay cable with a high damping level comparable to that of LQR control. However, passive NSD will also decrease the modal frequencies of a stay cable, whereas LQR will increase the frequencies slightly. The dynamic response results also indicate that the active LQR control offers slightly better control performance than the passive NSD in various loading cases. The superiority of the LQR control over the passive NSD can be explained through an output feedback control approach. It is noteworthy that the NSD is regarded as more practical and reliable because it offers protection by completely passive means without the need for the feedback and actuation that are required in active control.
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Acknowledgments
The authors are grateful for the financial support from the Research Grants Council of Hong Kong (Project PolyU 152222/14E) and the Innovation and Technology Commission of Hong Kong (Project 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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Published In
Journal of Bridge Engineering
Volume 22 • Issue 9 • September 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Dec 15, 2016
Accepted: Mar 24, 2017
Published online: Jun 28, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 28, 2017
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