The application of controlled variable magnetic eddy current damping to the study of vortex-induced vibrations
- Creators
- Klamo, Joseph T.
Abstract
A powerful variable magnetic eddy current damping system has been constructed and utilized in an experimental study of vortex-induced vibrations (VIV). This damping system allows us to impose precise values of nearly ideal viscous damping over a wide range of damping values of interest. This new damping system offers improvements over previously utilized damping methods. Unlike most studies of VIV, where the damping cannot be independently controlled, we are able to impose our system damping independent of the other system parameters. Also, because the system only requires that a thin conductive plate be attached to the oscillating system, the overall mass of the system does not increase dramatically and still allows the investigation of very low mass systems. Finally, the system can operate in a steady-state fashion, supplying a constant damping value for an extended period of time, or in a transient fashion, where the damping value is intentionally varied over time. With this damping system, we have systematically explored both steady and transient damping effects on VIV behavior and provide a brief overview of some sample results.
Additional Information
© Springer-Verlag 2009. Received: 28 August 2008 Revised: 16 April 2009 Accepted: 23 April 2009 Published online: 15 May 2009. I would like to thank Prof. Anatol Roshko who initially suggested using eddy currents as a means to generate damping. I am also very grateful to Profs. Anthony Leonard and Morteza Gharib for their insight and suggestions during this work. Finally, I would like to thank Prof. David Goodwin who helped with the estimations of magnetic field strength and the resultant damping during the design stage which allowed for the final product to meet the necessary requirements. This work was supported by ONR grant # N00014-94-1-0793 and a National Science Foundation Graduate Fellowship.Additional details
- Eprint ID
- 14897
- DOI
- 10.1007/s00348-009-0664-z
- Resolver ID
- CaltechAUTHORS:20090808-142503341
- N00014-94-1-0793
- Office of Naval Research
- NSF
- Created
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2009-09-03Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field