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Adaptive active control of flexural waves in a beam in the presence of a nearfield

Adaptive active control of flexural waves in a beam in the presence of a nearfield
Adaptive active control of flexural waves in a beam in the presence of a nearfield
This paper describes a wave-based, adaptive, feedforward system for the control of flexural waves in a beam when a significant nearfield wave is present. Many potential applications for active vibration control require a physically compact control system, in which the error sensors are located close to the control actuator. Because of the small physical size of the control system, there can be a significant nearfield wave as well as propagating waves in the vicinity of the error sensors, and the presence of this nearfield must be taken into account. An estimate of the downstream propagating wave amplitude is obtained by digitally filtering and combining the outputs of an array of three sensors, and is used as a cost function in a conventional filtered X-LMS adaptive algorithm. This has significant advantages over the more conventional approach in which the response at a single point is used as a cost function. Numerical simulations and experimental implementation of the control achieved with the wave-based and conventional systems are presented. It is seen that the wave-based system can offer significantly better broadband attenuation than the conventional approach in which response at a point is minimised.
0022-460X
149-71
Halkyard, C.R.
1dbeecd0-09a9-46a1-8b5a-a5ea91e4fb18
Mace, B.R.
681dd501-6313-441d-86e6-20a90fada824
Halkyard, C.R.
1dbeecd0-09a9-46a1-8b5a-a5ea91e4fb18
Mace, B.R.
681dd501-6313-441d-86e6-20a90fada824

Halkyard, C.R. and Mace, B.R. (2005) Adaptive active control of flexural waves in a beam in the presence of a nearfield. Journal of Sound and Vibration, 285 (1-2), 149-71. (doi:10.1016/j.jsv.2004.08.024).

Record type: Article

Abstract

This paper describes a wave-based, adaptive, feedforward system for the control of flexural waves in a beam when a significant nearfield wave is present. Many potential applications for active vibration control require a physically compact control system, in which the error sensors are located close to the control actuator. Because of the small physical size of the control system, there can be a significant nearfield wave as well as propagating waves in the vicinity of the error sensors, and the presence of this nearfield must be taken into account. An estimate of the downstream propagating wave amplitude is obtained by digitally filtering and combining the outputs of an array of three sensors, and is used as a cost function in a conventional filtered X-LMS adaptive algorithm. This has significant advantages over the more conventional approach in which the response at a single point is used as a cost function. Numerical simulations and experimental implementation of the control achieved with the wave-based and conventional systems are presented. It is seen that the wave-based system can offer significantly better broadband attenuation than the conventional approach in which response at a point is minimised.

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Published date: 2005

Identifiers

Local EPrints ID: 28495
URI: http://eprints.soton.ac.uk/id/eprint/28495
ISSN: 0022-460X
PURE UUID: d13d0e59-a411-444f-a399-945286e82f52

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Date deposited: 28 Apr 2006
Last modified: 15 Mar 2024 07:25

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Contributors

Author: C.R. Halkyard
Author: B.R. Mace

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