Abstract
The theoretical and experimental performance characteristics of a new class of Passive Magnetic Damping Composites (PMDC) are presented in this paper. These composites rely in their operation on arrays of specially arranged permanent magnetic strips that are embedded inside a visco-elastic damping matrix. Proper interaction between the magnetic and visco-elastic forces can enhance the damping characteristics of the PMDC in such a way that makes them suitable for vibration and noise control applications. The completely passive nature of the PMDC renders them to operate effectively without the need for any electronic sensors, actuators, associated circuitry or external energy sources. In this manner, the PMDC treatments provide an efficient and reliable means for damping out undesirable structural vibration and associated noise radiation.
A Finite element model is developed to describe the characteristics of the passive magnetic composites. The model accounts for the coupling between the permanent magnets, the visco-elastic damping and the base elastic structure. Such coupling is determined for different lay-up configurations of the magnetic strips. The analysis is guided by the theory of magneto-elasticity which is developed for untreated and undamped base structures.
The predictions of the finite element model are validated experimentally for beams/PMDC systems subjected to various boundary and loading conditions. The static and dynamic performance of the beams/PMDC systems are compared with the performance of beams treated with viscoelastic layers which are reinforced with nonmagnetic strips of similar mass and elastic properties as the magnetic strips used in the beams/PMDC systems. Such comparison emphasizes clearly the merits of the new class of PMDC.
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References
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© 1999 Springer Science+Business Media Dordrecht
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Baz, A. (1999). Passive Magnetic Damping Composites. In: Holnicki-Szulc, J., Rodellar, J. (eds) Smart Structures. NATO Science Series, vol 65. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4611-1_3
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DOI: https://doi.org/10.1007/978-94-011-4611-1_3
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-5613-4
Online ISBN: 978-94-011-4611-1
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