A wavenumber approach to analysing the active control of plane waves with arrays of secondary sources

The active control of an incident sound field with an array of secondary sources is a fundamental problem in active control. In this paper the optimal performance of an infinite array of secondary sources in controlling a plane incident sound wave is first considered in free space. An analytic solut...

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Published inJournal of sound and vibration Vol. 419; pp. 405 - 419
Main Authors Elliott, Stephen J., Cheer, Jordan, Bhan, Lam, Shi, Chuang, Gan, Woon-Seng
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Ltd 14.04.2018
Elsevier Science Ltd
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Online AccessGet full text
ISSN0022-460X
1095-8568
1095-8568
DOI10.1016/j.jsv.2018.01.028

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Abstract The active control of an incident sound field with an array of secondary sources is a fundamental problem in active control. In this paper the optimal performance of an infinite array of secondary sources in controlling a plane incident sound wave is first considered in free space. An analytic solution for normal incidence plane waves is presented, indicating a clear cut-off frequency for good performance, when the separation distance between the uniformly-spaced sources is equal to a wavelength. The extent of the near field pressure close to the source array is also quantified, since this determines the positions of the error microphones in a practical arrangement. The theory is also extended to oblique incident waves. This result is then compared with numerical simulations of controlling the sound power radiated through an open aperture in a rigid wall, subject to an incident plane wave, using an array of secondary sources in the aperture. In this case the diffraction through the aperture becomes important when its size is compatible with the acoustic wavelength, in which case only a few sources are necessary for good control. When the size of the aperture is large compared to the wavelength, and diffraction is less important but more secondary sources need to be used for good control, the results then become similar to those for the free field problem with an infinite source array.
AbstractList The active control of an incident sound field with an array of secondary sources is a fundamental problem in active control. In this paper the optimal performance of an infinite array of secondary sources in controlling a plane incident sound wave is first considered in free space. An analytic solution for normal incidence plane waves is presented, indicating a clear cut-off frequency for good performance, when the separation distance between the uniformly-spaced sources is equal to a wavelength. The extent of the near field pressure close to the source array is also quantified, since this determines the positions of the error microphones in a practical arrangement. The theory is also extended to oblique incident waves. This result is then compared with numerical simulations of controlling the sound power radiated through an open aperture in a rigid wall, subject to an incident plane wave, using an array of secondary sources in the aperture. In this case the diffraction through the aperture becomes important when its size is compatible with the acoustic wavelength, in which case only a few sources are necessary for good control. When the size of the aperture is large compared to the wavelength, and diffraction is less important but more secondary sources need to be used for good control, the results then become similar to those for the free field problem with an infinite source array.
Author Gan, Woon-Seng
Cheer, Jordan
Bhan, Lam
Elliott, Stephen J.
Shi, Chuang
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Active noise control
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SubjectTerms Acoustic emission testing
Acoustics
Active control
Active noise control
Arrays
Braided composites
Computer simulation
Diffraction
Feedforward control
Incident waves
Materials science
Microphones
Plane waves
Sound waves
Wave division multiplexing
Wavelengths
Wavenumber domain
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Title A wavenumber approach to analysing the active control of plane waves with arrays of secondary sources
URI https://dx.doi.org/10.1016/j.jsv.2018.01.028
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