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Proceedings Paper

Active vibration damping using an electrodynamic actuator with internal velocity sensor
Author(s): Christoph Paulitsch; Paolo Gardonio; Stephen J. Elliott
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Paper Abstract

Using self-sensing in an electrodynamic actuator for broadband active vibration damping requires compensation of the actuator resistance and of the self-inductance of the actuator with an appropriate shunted circuit. In order to reduce power consumption the actuator resistance should be small, but for robustness of self-sensing and a large bandwidth a large resistance is required. A high transducer coefficient is important to get high sensitivity of the induced voltage that is proportional to the vibration velocity of an attached mechanical structure. However, a large transducer coefficient implies a strong magnetic field that also increases the self-inductance so that the measurement bandwidth potentially is reduced. In this study, in order to eliminate the first trade-off between power consumption and robustness, an actuator with a primary driving coil and a secondary measurement coil is proposed. The primary coil is optimized for driving by choosing a small resistance, whereas the secondary coil is optimized for sensing by choosing a large resistance. It has been shown that the transformer coupling between the two coils could be reduced by decreasing the cross section of the secondary coil, but there is a geometric limit on the reduction of the cross section of the secondary coil. Therefore an analogue electronic compensation scheme is proposed to compensate for the transformer coupling between the primary and the secondary coil. Feedback of the sensed velocity in the secondary coil is implemented and experimental vibration damping results at a plate are presented. Results are compared to self-sensing vibration damping, active vibration damping using a velocity sensor and passive damping means of the same weight as the actuator.

Paper Details

Date Published: 16 May 2005
PDF: 12 pages
Proc. SPIE 5760, Smart Structures and Materials 2005: Damping and Isolation, (16 May 2005); doi: 10.1117/12.599882
Show Author Affiliations
Christoph Paulitsch, Univ. of Southampton (United Kingdom)
Paolo Gardonio, Univ. of Southampton (United Kingdom)
Stephen J. Elliott, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 5760:
Smart Structures and Materials 2005: Damping and Isolation
Kon-Well Wang, Editor(s)

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