27 June 2002 Comparison between the theoretical model and experimental outcomes of oscillations of para- and diamagnetic structures subject to passive magnetic elements
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Abstract
The paper presents a comparison between the theoretical dynamic model of systems made of structures of paramagnetic or diamagnetic conductible materials interacting with rare-earth passive magnetic elements and the relative experimental outcomes. The magnetic effects are characterized by a viscous-type damping, and by an interesting dynamic effect of stiffening of the structure called phantom effect, modeled adding an imaginary term in the damping coefficient of a single degree of freedom system. The theoretical model finds a proper application in case of a uniform cantilever clamped-free beam of different kinds of paramagnetic or diamagnetic conductible materials, whose frequency response is modified by the presence of a pair of concordant or discordant magnets settled at the free end. Through the comparison between theoretical and experimental results, the paper demonstrates the validity of the model; besides, the model points out the above mentioned effect of dynamic stiffening of the structure and, finally, the considerable localized damping properties in paramagnetic or diamagnetic materials with low electric resistivity, when interacting with permanent magnets of high residual induction.
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Bruno A. D. Piombo, Elvio Bonisoli, Massimo Ruzzene, "Comparison between the theoretical model and experimental outcomes of oscillations of para- and diamagnetic structures subject to passive magnetic elements", Proc. SPIE 4697, Smart Structures and Materials 2002: Damping and Isolation, (27 June 2002); doi: 10.1117/12.472677; https://doi.org/10.1117/12.472677
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