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Feedforward adaptive control of flexural vibration using wave amplitudes

Feedforward adaptive control of flexural vibration using wave amplitudes
Feedforward adaptive control of flexural vibration using wave amplitudes
This paper concerns the real-time estimation of wave amplitudes and their subsequent use as a cost function in adaptive active control of bending vibrations in a beam. The amplitude of the wave propagating downstream from the control location is estimated by filtering the outputs of an array of sensors. Minimizing this wave amplitude has significant advantages over the more conventional approach in which velocity at some point is minimized. Expressions for the ideal frequency responses of the wave filters are found for the case of an array comprising two sensors in the far field. These filters are non-causal. FIR implementations designed using direct and time-delay methods are described, the latter offering some substantial advantages. Practical performance considerations are discussed, including filter length, frequency range, effects of near fields, group delays, accuracy and cross-sensitivity. Simulations and experimental measurements are performed and compared.
0022-460X
117-141
Halkyard, C.R.
1dbeecd0-09a9-46a1-8b5a-a5ea91e4fb18
Mace, B.R.
cfb883c3-2211-4f3a-b7f3-d5beb9baaefe
Halkyard, C.R.
1dbeecd0-09a9-46a1-8b5a-a5ea91e4fb18
Mace, B.R.
cfb883c3-2211-4f3a-b7f3-d5beb9baaefe

Halkyard, C.R. and Mace, B.R. (2002) Feedforward adaptive control of flexural vibration using wave amplitudes. Journal of Sound and Vibration, 254 (1), 117-141. (doi:10.1006/jsvi.2001.4089).

Record type: Article

Abstract

This paper concerns the real-time estimation of wave amplitudes and their subsequent use as a cost function in adaptive active control of bending vibrations in a beam. The amplitude of the wave propagating downstream from the control location is estimated by filtering the outputs of an array of sensors. Minimizing this wave amplitude has significant advantages over the more conventional approach in which velocity at some point is minimized. Expressions for the ideal frequency responses of the wave filters are found for the case of an array comprising two sensors in the far field. These filters are non-causal. FIR implementations designed using direct and time-delay methods are described, the latter offering some substantial advantages. Practical performance considerations are discussed, including filter length, frequency range, effects of near fields, group delays, accuracy and cross-sensitivity. Simulations and experimental measurements are performed and compared.

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More information

Published date: 2002

Identifiers

Local EPrints ID: 10040
URI: http://eprints.soton.ac.uk/id/eprint/10040
ISSN: 0022-460X
PURE UUID: ae529fad-90f8-4bfa-aff0-94da05a89e37
ORCID for B.R. Mace: ORCID iD orcid.org/0000-0003-3312-4918

Catalogue record

Date deposited: 18 Jan 2005
Last modified: 19 Nov 2019 01:51

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