There exist many methods of adding damping to a vibrating structure; however, eddy current damping is one of few that can function without ever coming into contact with that structure. This magnetic damping scheme functions due to the eddy currents that are generated in a conductive material when it is subjected to a time changing magnetic field. Due to the circulation of these currents, a magnetic field is generated, which interacts with the applied field resulting in a force. In this manuscript, an active damper will be theoretically developed that functions by dynamically modifying the current flowing through a coil, thus generating a time-varying magnetic field. By actively controlling the strength of the field around the conductor, the induced eddy currents and the resulting damping force can be controlled. This actuation method is easy to apply and allows significant magnitudes of forces to be applied without ever coming into contact with the structure. Therefore, vibration control can be applied without inducing mass loading or added stiffness, which are downfalls of other methods. This manuscript will provide a theoretical derivation of the equations defining the electric fields generated and the dynamic forces induced in the structure. This derivation will show that when eddy currents are generated due to a variation in the strength of the magnetic source, the resulting force occurs at twice the frequency of the applied current. This frequency doubling effect will be experimentally verified. Furthermore, a feedback controller will be designed to account for the frequency doubling effect and a simulation performed to show that significant vibration suppression can be achieved with this technique.
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e-mail: henry.sodano@asu.edu
e-mail: dinman@vt.edu
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March 2008
Research Papers
Modeling of a New Active Eddy Current Vibration Control System
Henry A. Sodano,
Henry A. Sodano
Assistant Professor
Mem. ASME
Department of Mechanical and Aerospace Engineering,
e-mail: henry.sodano@asu.edu
Arizona State University
, Tempe, AZ 85287-6106
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Daniel J. Inman
Daniel J. Inman
GR Goodson Professor of Mechanical Engineering
Fellow ASME
Center for Intelligent Material Systems and Structures,
e-mail: dinman@vt.edu
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061-0261
Search for other works by this author on:
Henry A. Sodano
Assistant Professor
Mem. ASME
Department of Mechanical and Aerospace Engineering,
Arizona State University
, Tempe, AZ 85287-6106e-mail: henry.sodano@asu.edu
Daniel J. Inman
GR Goodson Professor of Mechanical Engineering
Fellow ASME
Center for Intelligent Material Systems and Structures,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061-0261e-mail: dinman@vt.edu
J. Dyn. Sys., Meas., Control. Mar 2008, 130(2): 021009 (11 pages)
Published Online: February 29, 2008
Article history
Received:
August 25, 2005
Revised:
August 13, 2007
Published:
February 29, 2008
Citation
Sodano, H. A., and Inman, D. J. (February 29, 2008). "Modeling of a New Active Eddy Current Vibration Control System." ASME. J. Dyn. Sys., Meas., Control. March 2008; 130(2): 021009. https://doi.org/10.1115/1.2837436
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