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Decentralised Feedback Control of Sound and Vibration

In order to control a broadband sound or vibration field over large areas it is generally necessary to use multiple actuators and sensors, which are positioned to make the modes of the system controllable and observable, and a fully-connected MIMO feedback controller. Alternatively a larger number of actuators and sensors can sometimes be positioned in closely-located pairs, and local feedback loops used to achieve control with a decentralised strategy. This has the potential advantage that each actuator/sensor/local controller system could be mass-produced and used as a cost-effective module in larger control systems. In this seminar examples of decentralised control will be discussed in several applications of the active control of sound and vibration. These will include active vibration isolation systems and active vibro-acoustic control of panels.
Type of Seminar:
Public Seminar
Prof. S J Elliott
Signal Processing & Control Group Institute of Sound & Vibration Research University of Southampton Highfield, Southampton, SO17 1BJ UK
Mar 12, 2002   14:00

ETH Zentrum, Gloriastrasse 35, ETZ room E6
Contact Person:

Prof. M. Morari
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Biographical Sketch:
Stephen J Elliott (SM'92) graduated in physics and electronics from the University of London, England, in 1976, and received the PhD degree from the University of Surrey in 1979 for a dissertation on musical acoustics. After a short period as a Research Fellow at the ISVR working on acoustic intensity measurement and as a temporary Lecturer at the University of Surrey, he was appointed Lecturer at the Institute of Sound and Vibration Research (ISVR), University of Southampton, in 1982. He was made Senior Lecturer at ISVR in 1988 and Professor in 1994. His research interests have been mainly concerned with the connections between the physical world and digital signal processing, originally in relation to the modeling and synthesis of speech and, more recently, in relation to the active control of sound and vibration. This work has resulted in the practical demonstration of active control in propeller aircraft, cars and helicopters. His current research interests include the active control of structural waves, active isolation, adaptive algorithms for feedforward and feedback control, the control of nonlinear systems and biomedical signal processing and control. Professor Elliott is co-author of Active Control of Sound (with P A Nelson), Active Control of Vibration (with C R Fuller and P A Nelson) and author of Signal Processing for Active Control. He is a member of the Acoustical Society of America and the UK Institute of Acoustics, from whom he was jointly awarded the Tyndall Medal in 1992.