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An optimal local active noise control method based on stochastic finite element models

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Airaksinen, T. & Toivanen, J. (2013). An optimal local active noise control method based on stochastic finite element models. Journal of Sound and Vibration, 332 (2013) pp.6924-6933. doi:10.1016/j.jsv.2013.08.016
Published in
Journal of Sound and Vibration
Authors
Airaksinen, Tuomas |
Toivanen, Jari
Date
2013
Copyright
© 2013 Elsevier Ltd. This is a post-print version of a paper published in Journal of Sound and Vibration 332 (2013) pp. 6924-6933 by Elsevier.

 
A new method is presented to obtain a local active noise control that is optimal in stochastic environment. The method uses numerical acoustical modeling that is performed in the frequency domain by using a sequence of finite element discretizations of the Helmholtz equation. The stochasticity of domain geometry and primary noise source is considered. Reference signals from an array of microphones are mapped to secondary loudspeakers, by an off-line optimized linear mapping. The frequency dependent linear mapping is optimized to minimize the expected value of error in a quiet zone, which is approximated by the numerical model and can be interpreted as a stochastic virtual microphone. A least squares formulation leads to a quadratic optimization problem. The presented active noise control method gives robust and efficient noise attenuation, which is demonstrated by a numerical study in a passenger car cabin. The numerical results demonstrate that a significant, stable local noise attenuation of 20–32 dB can be obtained at lower frequencies (< 500 Hz) by two microphones, and 8–36 dB attenuation at frequencies up to 1000 Hz, when 8 microphones are used. ...
Publisher
Elsevier
ISSN Search the Publication Forum
0022-460X
Keywords
active noise control stochastic domain Helmholtz equation finite element method passenger car Quadratic optimization Helmholtzin yhtälö meluntorjunta melunvaimennus

NB.
Previous title (pre-print version): An optimal feed-forward local active noise control method based on stochastic finite element models

DOI
https://doi.org/10.1016/j.jsv.2013.08.016
URI

http://urn.fi/URN:NBN:fi:jyu-201211203036

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