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Base impedance of velocity feedback control units with proof-mass electrodynamic actuators

Base impedance of velocity feedback control units with proof-mass electrodynamic actuators
Base impedance of velocity feedback control units with proof-mass electrodynamic actuators
Control units comprising a proof-mass electrodynamic actuator and accelerometer-sensor pair with a time integrator and fixed gain controller are an effective way to implement velocity feedback control on panels. The control units produce active damping provided the fundamental resonance frequency of the actuator is well below that of the structure under control. Control stability limits arise from the actuator fundamental resonance which introduces a 180° phase lag in the control unit response, thus causing the feedback loop to be only conditionally stable.

In contrast to previous studies, this paper discusses the response of the control unit in terms of the open and closed-circuit base impedance that it exerts on the structure. This allows for a straight forward physical interpretation of both stability and control performance. Experimental and simulation results show that the base impedance can be described as the sum of passive and active frequency response functions, where the active part of the control unit response depends on the actuator dynamics and also on the response of the analogue controller circuit.

It is demonstrated that the control stability could be enhanced by implementing an appropriate compensator that shifts the fundamental resonance of the control units towards lower frequencies.
velocity feedback control, electrodynamic poof-mass actuator, compensator
0854329102
12pp
University of Southampton
Rohlfing, J.
d8f611a6-8ee7-47bd-8616-59d806bc1788
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Brennan, M.J.
Kovacic, Ivana
Lopes, V.
Murphy, K.
Petersson, B.
Rizzi, S.
Yang, T.
Rohlfing, J.
d8f611a6-8ee7-47bd-8616-59d806bc1788
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Brennan, M.J.
Kovacic, Ivana
Lopes, V.
Murphy, K.
Petersson, B.
Rizzi, S.
Yang, T.

Rohlfing, J., Gardonio, P. and Elliott, S.J. (2010) Base impedance of velocity feedback control units with proof-mass electrodynamic actuators. Brennan, M.J., Kovacic, Ivana, Lopes, V., Murphy, K., Petersson, B., Rizzi, S. and Yang, T. (eds.) In Recent Advances Structural Dynamics: Proceedings of the X International Conference. University of Southampton. 12pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Control units comprising a proof-mass electrodynamic actuator and accelerometer-sensor pair with a time integrator and fixed gain controller are an effective way to implement velocity feedback control on panels. The control units produce active damping provided the fundamental resonance frequency of the actuator is well below that of the structure under control. Control stability limits arise from the actuator fundamental resonance which introduces a 180° phase lag in the control unit response, thus causing the feedback loop to be only conditionally stable.

In contrast to previous studies, this paper discusses the response of the control unit in terms of the open and closed-circuit base impedance that it exerts on the structure. This allows for a straight forward physical interpretation of both stability and control performance. Experimental and simulation results show that the base impedance can be described as the sum of passive and active frequency response functions, where the active part of the control unit response depends on the actuator dynamics and also on the response of the analogue controller circuit.

It is demonstrated that the control stability could be enhanced by implementing an appropriate compensator that shifts the fundamental resonance of the control units towards lower frequencies.

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More information

Published date: July 2010
Additional Information: Paper No. 079 (Format - USB Pen Drive)
Keywords: velocity feedback control, electrodynamic poof-mass actuator, compensator

Identifiers

Local EPrints ID: 160859
URI: http://eprints.soton.ac.uk/id/eprint/160859
ISBN: 0854329102
PURE UUID: ef3a1242-6c65-47fd-984c-98e64b64e2d9

Catalogue record

Date deposited: 20 Jul 2010 15:21
Last modified: 10 Dec 2021 18:24

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Contributors

Author: J. Rohlfing
Author: P. Gardonio
Author: S.J. Elliott
Editor: M.J. Brennan
Editor: Ivana Kovacic
Editor: V. Lopes
Editor: K. Murphy
Editor: B. Petersson
Editor: S. Rizzi
Editor: T. Yang

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