Magnetic negative stiffness damper and its application to stay cables

X. Shi, S. Zhu

Research output: Journal article publicationConference articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

This paper introduces a novel design of magnetic negative stiffness dampers (MNSDs) and its application to vibration suppression for stay cables. The MNSDs are composed of a number of permanent magnets properly arranged in a conductive pipe, and such configurations efficiently integrate fully passive negative stiffness mechanism and eddy-current damping in a simple and compact design. When applied to vibration suppression of stay cables, MNSDs can achieve control performance comparable to semi-active or active control. The installation of MNSD can provide considerably high damping to cable structures. Negative stiffness springs may amplify local vibration amplitude at the damper location, through which the locking effect can be overcome and significant kinetic energy can be dissipated by viscous damping. Optimal damping performance corresponding to a certain value of negative stiffness can be obtained if the damper's damping coefficient is tuned properly.

Keywords

  • Magnetic stiffness damper
  • Optimal damping ratio
  • Stay cable
  • Vibration mitigation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

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