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Test rig with active damping control for the simultaneous evaluation of vibration control and energy harvesting via piezoelectric transducers

 
: Perfetto, Sara; Rohlfing, Jens; Infante, Francesco; Mayer, Dirk; Herold, Sven

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Fulltext (PDF; )

Bonisoli, E. ; Institute of Physics -IOP-, London:
13th International Conference on Motion and Vibration Control, MOVIC 2016 and the 12th International Conference on Recent Advances in Structural Dynamics, RASD 2016 : 4-6 July 2016, Southampton, UK
Bristol: IOP Publishing, 2016 (Journal of physics. Conference series 744)
ISBN: 978-1-5108-3057-8
Art. 012010, 13 pp.
International Conference on Motion and Vibration Control (MOVIC) <13, 2016, Southampton>
International Conference on Recent Advances in Structural Dynamics (RASD) <12, 2016, Southampton>
English
Conference Paper, Electronic Publication
Fraunhofer LBF ()

Abstract
Piezoelectric transducers can be used to harvest electrical energy from structural vibrations in order to power continuously operating condition monitoring systems local to where they operate. However, excessive vibrations can compromise the safe operation of mechanical systems. Therefore, absorbers are commonly used to control vibrations. With an integrated device, the mechanical energy that otherwise would be dissipated can be converted via piezoelectric transducers. Vibration absorbers are designed to have high damping factors. Hence, the integration of transducers would lead to a low energy conversion. Efficient energy harvesters usually have low damping capabilities; therefore, they are not effective for vibration suppression. Thus, the design of an integrated device needs to consider the two conflicting requirements on the damping. This study focuses on the development of a laboratory test rig with a host structure and a vibration absorber with tunable damping via an active relative velocity feedback. A voice coil actuator is used for this purpose. To overcome the passive damping effects of the back electromagnetic force a novel voltage feedback control is proposed, which has been validated both in simulation and experimentally. The aim of this study is to have a test rig ready for the introduction of piezo-transducers and available for future experimental evaluations of the damping effect on the effectiveness of vibration reduction and energy harvesting efficiency.

: http://publica.fraunhofer.de/documents/N-445248.html