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The integration of advanced active and passive structural noise control methods

The integration of advanced active and passive structural noise control methods
The integration of advanced active and passive structural noise control methods
This paper reports on an investigation into the feasibility of using active and passive means of vibration control in aerospace structures. In particular, attention is focused on controlling vibration transmission through light weight satellite structures at medium frequencies. The initial structure under test here is a 4.5-meter long satellite boom consisting of 10 identical bays with equilateral triangular cross sections. This structure is typical of those that might be used in space telescopes, space stations or synthetic aperture radar systems. Such a structure is typically used to support sensitive instruments in precise alignments spaced tens of metres apart. While a great deal of work has been done on this problem at low frequencies, relatively little has been achieved to date at medium frequencies (here taken to be between 150 Hz and 250 Hz). Nonetheless, this is of importance to new space missions. Using the techniques described here, an overall reduction in vibration transmission of 31.0 dB is achieved in an essentially undamped structure using passive means alone. The amounts of attenuation achievable for active control with one, two and three actuators are found to be 15.1 dB, 26.1 dB and 33.5 dB, respectively. With the combined passive control (using 10% geometric deviations) and active control (using three actuators) an overall reduction of 49.5 dB is achievable in practice.
structural vibration, passive control, active control, optimization, genetic algorithm
0020-7683
6472-6487
Moshrefi-Torbati, M
65b351dc-7c2e-4a9a-83a4-df797973913b
Keane, A.J.
26d7fa33-5415-4910-89d8-fb3620413def
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Brennan, M.J.
87c7bca3-a9e5-46aa-9153-34c712355a13
Rogers, E.
611b1de0-c505-472e-a03f-c5294c63bb72
Moshrefi-Torbati, M
65b351dc-7c2e-4a9a-83a4-df797973913b
Keane, A.J.
26d7fa33-5415-4910-89d8-fb3620413def
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Brennan, M.J.
87c7bca3-a9e5-46aa-9153-34c712355a13
Rogers, E.
611b1de0-c505-472e-a03f-c5294c63bb72

Moshrefi-Torbati, M, Keane, A.J., Elliott, S.J., Brennan, M.J. and Rogers, E. (2006) The integration of advanced active and passive structural noise control methods. International Journal of Solids and Structures, 43 (21), 6472-6487. (doi:10.1016/j.ijsolstr.2005.11.009).

Record type: Article

Abstract

This paper reports on an investigation into the feasibility of using active and passive means of vibration control in aerospace structures. In particular, attention is focused on controlling vibration transmission through light weight satellite structures at medium frequencies. The initial structure under test here is a 4.5-meter long satellite boom consisting of 10 identical bays with equilateral triangular cross sections. This structure is typical of those that might be used in space telescopes, space stations or synthetic aperture radar systems. Such a structure is typically used to support sensitive instruments in precise alignments spaced tens of metres apart. While a great deal of work has been done on this problem at low frequencies, relatively little has been achieved to date at medium frequencies (here taken to be between 150 Hz and 250 Hz). Nonetheless, this is of importance to new space missions. Using the techniques described here, an overall reduction in vibration transmission of 31.0 dB is achieved in an essentially undamped structure using passive means alone. The amounts of attenuation achievable for active control with one, two and three actuators are found to be 15.1 dB, 26.1 dB and 33.5 dB, respectively. With the combined passive control (using 10% geometric deviations) and active control (using three actuators) an overall reduction of 49.5 dB is achievable in practice.

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More information

e-pub ahead of print date: 14 February 2006
Published date: October 2006
Keywords: structural vibration, passive control, active control, optimization, genetic algorithm
Organisations: Inst. Sound & Vibration Research, Engineering Science Unit, Southampton Wireless Group

Identifiers

Local EPrints ID: 264356
URI: http://eprints.soton.ac.uk/id/eprint/264356
ISSN: 0020-7683
PURE UUID: 0510bf66-2b0e-49c8-a7b9-75e1266a3aee
ORCID for E. Rogers: ORCID iD orcid.org/0000-0003-0179-9398

Catalogue record

Date deposited: 29 Jul 2007
Last modified: 07 Aug 2019 00:53

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