Stochastic seismic analysis of structures with nonlinear eddy current dampers

Eddy current damper (ECD), a contactless energy-dissipating device, is applying to control the vibration induced by earthquake and strong wind in civil structures. Combining with motion magnification mechanisms improves the damping effect of the ECD while significantly strengthens its nonlinearity....

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Bibliographic Details
Published in:Journal of low frequency noise, vibration, and active control vibration, and active control, 2023-03, Vol.42 (1), p.69-79
Main Authors: Huo, Zhao-Yu, Khalique, Chaudry Masood
Format: Article
Language:English
Subjects:
Criteria
Damping
Degrees of freedom
Earthquake dampers
Eddy currents
Linear damping
Linearization
Nonlinearity
Power spectral density
Seismic analysis
Seismic response
Spectral density function
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Summary:Eddy current damper (ECD), a contactless energy-dissipating device, is applying to control the vibration induced by earthquake and strong wind in civil structures. Combining with motion magnification mechanisms improves the damping effect of the ECD while significantly strengthens its nonlinearity. The response of single degree of freedom and multi-degree of freedom system with ECDs under a stationary stochastic earthquake characterized by the power spectral density function is evaluated using the stochastic linearization technique and expressions of the equivalent linear damping coefficient based on force criterion and energy criterion have been found, respectively. Comparisons with results obtained by Monte Carlo simulations confirm that for the nonlinearity of eddy current dampers the force-based criterion stochastic linearization technique gives accurate estimation.
ISSN:1461-3484
2048-4046
DOI:10.1177/14613484221123116