Magnetic fields can be used to apply damping to a vibrating structure. Dampers of this type function through the eddy currents that are generated in a conductive material experiencing a time-changing magnetic field. The density of these currents is directly related to the velocity of the change in magnetic field. However, following the generation of these currents, the internal resistance of the conductor causes them to dissipate into heat. Because a portion of the moving conductor’s kinetic energy is used to generate the eddy currents, which are then dissipated, a damping effect occurs. This damping force can be described as a viscous force due to the dependence on the velocity of the conductor. In a previous study, a permanent magnet was fixed in a location such that the poling axis was perpendicular to the beam’s motion and the radial magnetic flux was used to passively suppress the beam’s vibration. Using this passive damping concept and the idea that the damping force is directly related to the velocity of the conductor, a new passive-active damping mechanism will be created. This new damper will function by allowing the position of the magnet to change relative to the beam and thus allow the net velocity between the two to be maximized and thus the damping force significantly increased. Using this concept, a model of both the passive and active portion of the system will be developed, allowing the beams response to be simulated. To verify the accuracy of this model, experiments will be performed that demonstrate both the accuracy of the model and the effectiveness of this passive-active control system for use in suppressing the transverse vibration of a structure.
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e-mail: hsodano@mtu.edu
e-mail: dinman@vt.edu
e-mail: w.k.belvin@larc.gov
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June 2006
Technical Papers
Development of a New Passive-Active Magnetic Damper for Vibration Suppression
Henry A. Sodano,
Henry A. Sodano
Assistant Professor
Mechanical Engineering Department,
e-mail: hsodano@mtu.edu
Michigan Technological University
, 1400 Townsend Dr., Houghton, MI 49931
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Daniel J. Inman,
Daniel J. Inman
Professor, Director
Center for Intelligent Material Systems and Structures,
e-mail: dinman@vt.edu
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061-0261
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W. Keith Belvin
W. Keith Belvin
Structural Dynamics Branch,
e-mail: w.k.belvin@larc.gov
NASA Langley Research Center
, Hampton, VA 23681-0001
Search for other works by this author on:
Henry A. Sodano
Assistant Professor
Mechanical Engineering Department,
Michigan Technological University
, 1400 Townsend Dr., Houghton, MI 49931e-mail: hsodano@mtu.edu
Daniel J. Inman
Professor, Director
Center for Intelligent Material Systems and Structures,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061-0261e-mail: dinman@vt.edu
W. Keith Belvin
Structural Dynamics Branch,
NASA Langley Research Center
, Hampton, VA 23681-0001e-mail: w.k.belvin@larc.gov
J. Vib. Acoust. Jun 2006, 128(3): 318-327 (10 pages)
Published Online: November 3, 2005
Article history
Received:
December 22, 2004
Revised:
November 3, 2005
Citation
Sodano, H. A., Inman, D. J., and Belvin, W. K. (November 3, 2005). "Development of a New Passive-Active Magnetic Damper for Vibration Suppression." ASME. J. Vib. Acoust. June 2006; 128(3): 318–327. https://doi.org/10.1115/1.2172258
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