Decentralized control for multichannel active vibration isolation


Kim, Sang-Myeong, Elliott, S.J. and Brennan, M.J. (2001) Decentralized control for multichannel active vibration isolation. IEEE Transactions on Control Systems Technology, 9, (1), 93-100. (doi:10.1109/87.896750).

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Original Publication URL: http://dx.doi.org/10.1109/87.896750

Description/Abstract

This paper describes a theoretical and experimental investigation into an active four-mount vibration isolation system, in which electromagnetic actuators are installed in parallel with each of the four passive mounts placed between a three-dimensional piece of equipment and a vibrating base structure. Decentralized velocity feedback control is applied, where each actuator is operated independently by feeding back the corresponding equipment vibration velocity at the same location. Although one end of the actuator acts at the sensor position on the equipment, the system is not collocated because of the reactive force at the other end acting on the flexible base structure, whose dynamics may be strongly coupled with the mounted equipment. The investigation of this actuator installation and its practical implementation are the motivation of this research. Isolation of low-frequency vibration is considered where the equipment can be modeled as a rigid body and the mounts as lumped-parameter springs and dampers. A general theoretical formulation for analysing multiple-mount vibration isolation systems using the impedance method is presented and is used to investigate the control mechanisms involved. Experimental results show that up to 14 dB reduction in the kinetic energy of the equipment can be achieved in practice. If very high gains are used in the experiments, however, instability occurs at low frequencies due to phase shifts in the transducer conditioning electronics.

Item Type: Article
ISSNs: 1063-6536 (print)
Related URLs:
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Dynamics
University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Signal Processing and Control
ePrint ID: 10833
Date Deposited: 27 Jun 2005
Last Modified: 27 Mar 2014 18:02
URI: http://eprints.soton.ac.uk/id/eprint/10833

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