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Active vibration isolation using an inertial actuator with local force feedback control

Active vibration isolation using an inertial actuator with local force feedback control
Active vibration isolation using an inertial actuator with local force feedback control
The design of inertial actuators with local force feedback control and their use in active vibration isolation systems is considered. Unlike reactive actuators, inertial actuators do not need to react off a base structure and can therefore be directly installed on a vibrating structure. In order to guarantee good stability margins in the active isolation controller, however, the actuator resonance must have a low natural frequency and it must be well damped.
The behaviour of an inertial actuator with different local force feedback control schemes is first analysed, and it is shown that a phase-lag controller has a good stability margin and can effectively damp the actuator resonance using relatively low gains, compared with a direct force feedback or integrated force feedback controller.
A frequency-domain formulation is then used to analyse the stability and performance of an active isolation system using an inertial actuator with local force feedback control and an outer velocity feedback control loop. The plant response, from force actuator input to sensor output, is derived in terms of the mechanical mobilities of the equipment structure being isolated and the vibrating base structure, and the mechanical impedance of the intervening mount.
An experimental study of active vibration isolation using an inertial actuator with local feedback control was then carried out. Theory and experiments agree well, demonstrating the effectiveness of the phase-lag controller. However, the need to have an inertial actuator with a low resonance frequency leads to problems with static deflections.
0022-460X
157-79
Benassi, L.
c3a4d710-4e31-4437-b189-2b04f18c8f1e
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
Benassi, L.
c3a4d710-4e31-4437-b189-2b04f18c8f1e
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a

Benassi, L., Elliott, S.J. and Gardonio, P. (2004) Active vibration isolation using an inertial actuator with local force feedback control. Journal of Sound and Vibration, 276 (1-2), 157-79. (doi:10.1016/j.jsv.2003.07.019).

Record type: Article

Abstract

The design of inertial actuators with local force feedback control and their use in active vibration isolation systems is considered. Unlike reactive actuators, inertial actuators do not need to react off a base structure and can therefore be directly installed on a vibrating structure. In order to guarantee good stability margins in the active isolation controller, however, the actuator resonance must have a low natural frequency and it must be well damped.
The behaviour of an inertial actuator with different local force feedback control schemes is first analysed, and it is shown that a phase-lag controller has a good stability margin and can effectively damp the actuator resonance using relatively low gains, compared with a direct force feedback or integrated force feedback controller.
A frequency-domain formulation is then used to analyse the stability and performance of an active isolation system using an inertial actuator with local force feedback control and an outer velocity feedback control loop. The plant response, from force actuator input to sensor output, is derived in terms of the mechanical mobilities of the equipment structure being isolated and the vibrating base structure, and the mechanical impedance of the intervening mount.
An experimental study of active vibration isolation using an inertial actuator with local feedback control was then carried out. Theory and experiments agree well, demonstrating the effectiveness of the phase-lag controller. However, the need to have an inertial actuator with a low resonance frequency leads to problems with static deflections.

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Published date: 2004

Identifiers

Local EPrints ID: 28233
URI: https://eprints.soton.ac.uk/id/eprint/28233
ISSN: 0022-460X
PURE UUID: 0624e6c2-c64f-4c29-aed9-829a96389f39

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Date deposited: 28 Apr 2006
Last modified: 17 Jul 2017 16:02

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Contributors

Author: L. Benassi
Author: S.J. Elliott
Author: P. Gardonio

University divisions

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