Active control of an off-axis noise source

Authors

  • J. Guo Sch. of Occup. and Environ. Hygiene, Department of Mechanical Engineering, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
  • M. Hodgson Sch. of Occup. and Environ. Hygiene, Department of Mechanical Engineering, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
  • J. Pan Sch. of Occup. and Environ. Hygiene, Department of Mechanical Engineering, University of British Columbia, Vancouver, BC V6T 1Z3, Canada

Keywords:

Natural frequencies, Optimal control systems, Optimization, Wavefronts, Active control

Abstract

A multi-channel active-noise-control system can been used to create a large quiet zone in free-space when the noise source is on the symmetry axis of the control system. In this study, the efficiency of a multi-channel active-noise-control system is investigated numerically for the case of a noise source located at off-axis positions. It was found that both the location and the size of the quiet zone change significantly with the off-axis location of the noise source. The control system is still able to construct a large area of wavefront matching, and create a large quiet zone, when the off-axis shift of the noise source is within this range. There exists an off-axis range for which an optimally pre-arranged multiple-channel control system remains optimized. This range is expressed analytically in terms of the wavelength at the frequency of interest, and of the configuration of the control system.

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Published

2001-03-01

How to Cite

1.
Guo J, Hodgson M, Pan J. Active control of an off-axis noise source. Canadian Acoustics [Internet]. 2001 Mar. 1 [cited 2021 Oct. 18];29(1):13-7. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1354

Issue

Section

Technical Articles