Concept and model of eddy current damper for vibration suppression of a beam
โ Scribed by Henry A. Sodano; Jae-Sung Bae; Daniel J. Inman; W. Keith Belvin
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 462 KB
- Volume
- 288
- Category
- Article
- ISSN
- 0022-460X
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โฆ Synopsis
Electromagnetic forces are generated by the movement of a conductor through a stationary magnetic field or a time varying magnetic field through a stationary conductor and can be used to suppress the vibrations of a flexible structure. In the present study, a new electromagnetic damping mechanism is introduced. This mechanism is different from previously developed electromagnetic braking systems and eddy current dampers because the system investigated in the subsequent manuscript uses the radial magnetic flux to generate the electromagnetic damping force rather than the flux perpendicular to the magnet's face as done in other studies. One important advantage of the proposed mechanism is that it is simple and easy to apply. Additionally, a single magnet can be used to damp the transverse vibrations that are present in many structures. Furthermore, it does not require any electronic devices or external power supplies, therefore functioning as a non-contacting passive damper. A theoretical model of the system is derived using electromagnetic theory enabling us to estimate the electromagnetic damping force induced on the structure. The proposed eddy current damper was constructed and experiments were performed to verify the precision of the theoretical model. It is found that the proposed eddy current damping mechanism could increase the damping ratio by up to 150 times and provide sufficient damping force to quickly suppress the beam's vibration.
๐ SIMILAR VOLUMES
When a flexible robot arm, a cantilevered beam type of structure, moves with a fast speed between workstations and is suddenly stopped after a new positioning is completed, excessive transient vibrations are produced as a result of the flexibility. An impact damping technique may be used to control