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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 thin flexible structures. These control units produce active damping provided the fundamental resonance frequency of the actuators is well below that of the structure under control. Control stability limits arise from the actuators fundamental resonances which introduce a 180° phase lag in the sensor–actuator frequency response functions, thus causing the feedback loops to be only conditionally stable. In contrast to previous studies, this paper discusses the response of a control unit with electrodynamic proof-mass actuator in terms of the open- and closed-loop 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 electromechanical response and also on the response function of the analogue controller circuit. The results show that the base impedance formulation can be effectively used to investigate new designs of both the actuator and electronic controller in order to optimise the stability and performance properties of the control unit.
0022-460X
4661-4675
Rohlfing, J.
d8f611a6-8ee7-47bd-8616-59d806bc1788
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Rohlfing, J.
d8f611a6-8ee7-47bd-8616-59d806bc1788
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567

Rohlfing, J., Gardonio, P. and Elliott, S.J. (2011) Base impedance of velocity feedback control units with proof-mass electrodynamic actuators. Journal of Sound and Vibration, 330 (20), 4661-4675. (doi:10.1016/j.jsv.2011.04.028).

Record type: Article

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 thin flexible structures. These control units produce active damping provided the fundamental resonance frequency of the actuators is well below that of the structure under control. Control stability limits arise from the actuators fundamental resonances which introduce a 180° phase lag in the sensor–actuator frequency response functions, thus causing the feedback loops to be only conditionally stable. In contrast to previous studies, this paper discusses the response of a control unit with electrodynamic proof-mass actuator in terms of the open- and closed-loop 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 electromechanical response and also on the response function of the analogue controller circuit. The results show that the base impedance formulation can be effectively used to investigate new designs of both the actuator and electronic controller in order to optimise the stability and performance properties of the control unit.

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More information

Published date: September 2011
Organisations: Signal Processing & Control Grp

Identifiers

Local EPrints ID: 198857
URI: http://eprints.soton.ac.uk/id/eprint/198857
ISSN: 0022-460X
PURE UUID: 27c39d98-905b-43db-b28e-7dd57ac8cf05

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Date deposited: 07 Oct 2011 16:10
Last modified: 14 Mar 2024 04:14

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Contributors

Author: J. Rohlfing
Author: P. Gardonio
Author: S.J. Elliott

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