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|Title:||Active noise control in a pure tone diffuse sound field using virtual sensing|
|Citation:||Journal of the Acoustical Society of America, 2009; 125(6):3742-3755|
|Publisher:||Acoustical Soc Amer Amer Inst Physics|
|D. J. Moreau, J. Ghan, B. S. Cazzolato, and A. C. Zander|
|Abstract:||Local active noise control systems generate a zone of quiet at the physical error sensor using one or more secondary sources to cancel acoustic pressure and its spatial derivatives at the sensor location. The resulting zone of quiet is generally limited in size and as such, placement of the error sensor at the location of desired attenuation is required, which is often inconvenient. Virtual acoustic sensors overcome this by projecting the zone of quiet away from the physical sensor to a remote location. The work described here investigates the effectiveness of using virtual sensors in a pure tone diffuse sound field. Stochastically optimal virtual microphones and virtual energy density sensors are developed for use in diffuse sound fields. Analytical expressions for the controlled sound field generated with a number of control strategies are presented. These expressions allow the optimal control performance to be predicted. Results of numerical simulations and experimental measurements made in a reverberation chamber are also presented and compared.|
|Keywords:||acoustic field; acoustic wave absorption; acoustic wave scattering; active noise control; optimal control; reverberation chambers|
|Description:||©2009 Acoustical Society of America|
|Appears in Collections:||Mechanical Engineering publications|
Environment Institute publications
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