A preliminary study on the performance of indoor active noise barriers based on 2D simulations

Abstract Single screen barriers are widely used in open-plan offices as a means of improving acoustical privacy. However, the insertion loss of an indoor barrier is limited in low frequency range. Active control systems have been shown to be able to enhance the insertion loss of outdoors noise barrier in low frequency range, so its feasibility for improving the performance of indoor barriers is investigated in this paper. The simulation results show that about 10 dB extra insertion loss below 500 Hz can be obtained with the active control system when the squared sound pressure inside the entire observation area is minimized. The performance of the active noise barrier deteriorated significantly due to the reflecting ceiling, and the performance is hardly improved by increasing the ceiling height or the ceiling absorption coefficient. Finally, the effects of the sensing strategy on the control performance and the impacts of the active control system on the source side are discussed.

[1]  Marek Pawelczyk.  Adaptive noise control algorithms for active headrest system , 2004 .

[2]  Ben Cazzolato,et al.  A Review of Virtual Sensing Algorithms for Active Noise Control , 2008, Algorithms.

[3]  John S. Bradley,et al.  Prediction of the speech intelligibility index behind a single screen in an open-plan office , 2002 .

[4]  Akira Omoto,et al.  A study of an actively controlled noise barrier , 1993 .

[5]  A. Berkhoff.  Control strategies for active noise barriers using near-field error sensing , 2005 .

[6]  K. Attenborough.  Ground parameter information for propagation modeling , 1992 .

[7]  P Chevret.  Advantages of the incoherent uniform theory of diffraction for acoustic calculations in open-plan offices. , 2015, The Journal of the Acoustical Society of America.

[8]  W. J. Hadden,et al.  Sound diffraction around screens and wedges for arbitrary point source locations , 1981 .

[9]  S. Elliott,et al.  Near Field Zones of Quiet , 1994 .

[10]  A Le Bot,et al.  Comparison of an integral equation on energy and the ray-tracing technique in room acoustics. , 2000, The Journal of the Acoustical Society of America.

[11]  Siu-Kit Lau,et al.  Performance of a noise barrier within an enclosed space , 2009 .

[12]  Akira Omoto,et al.  Active suppression of sound diffracted by a barrier: An outdoor experiment , 1997 .

[13]  Jie Pan,et al.  Increasing the insertion loss of noise barriers using an active-control system , 1998 .

[14]  Y. Shimizu.  Actively controlled Noise Barrier , 1996 .

[15]  Xiaojun Qiu,et al.  A study of sound intensity control for active noise barriers , 2007 .

[16]  John S. Bradley,et al.  A mathematical model for a single screen barrier in open-plan offices , 2002 .

[17]  Philip A. Nelson,et al.  Active Control of Sound , 1992 .

[18]  N. Lalor,et al.  Analysis of interior acoustic fields using the finite element method and the boundary element method , 1995 .

[19]  P Chevret,et al.  Implementation of diffraction in a ray-tracing model for the prediction of noise in open-plan offices. , 2012, The Journal of the Acoustical Society of America.

[20]  Jun Shao,et al.  THE METHOD OF THE MINIMUM SUM OF SQUARED ACOUSTIC PRESSURES IN AN ACTIVELY CONTROLLED NOISE BARRIER , 1997 .

[21]  J. Perret-Liaudet,et al.  Radiative transfer equation for multiple diffraction , 2005 .

[22]  Boaz Rafaely,et al.  Zones of quiet in a broadband diffuse sound field , 2001, 2310.04191.

[23]  James B. Moreland,et al.  The Performance of Acoustic Barriers , 1973 .

[24]  Ning Han,et al.  A further study of a mathematical model for a screen in open-plan offices , 2008 .

[25]  Ben S. Cazzolato,et al.  Active noise control with a virtual acoustic sensor in a pure-tone diffuse sound field , 2007 .