Active control of road noise inside vehicles

An active sound control system has been developed for automobiles which uses interior loudspeakers to counteract the low-frequency rumble of road noise when driving on typical road surfaces. Reductions of around 7 dB of A-weighted sound pressure level in the range 100-200 Hz were measured using the...

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Bibliographic Details
Published in:Noise control engineering journal 1994-01, Vol.42 (4), p.137-147
Main Authors: Sutton, Trevor J., Elliott, Stephen J., McDonald, A. Malcolm, Saunders, Timothy J.
Format: Article
Language:English
Subjects:
Acoustics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Noise: its effects and control
Physics
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Summary:An active sound control system has been developed for automobiles which uses interior loudspeakers to counteract the low-frequency rumble of road noise when driving on typical road surfaces. Reductions of around 7 dB of A-weighted sound pressure level in the range 100-200 Hz were measured using the system. Six accelerometers were attached to the vehicle structure to detect road-induced vibration and to provide reference signals for a feedforward control strategy. In this paper the design basis of the control system is set out and the theoretical and practical limitations inherent in this approach are examined. It is seen that key issues are (1) the placement of reference accelerometers for maximum multiple coherence with respect to the interior noise to be attenuated, and (2) adequate time advance of the reference signals to allow the controller to act in real time.
ISSN:0736-2501
2168-8710
DOI:10.3397/1.2828351