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.

Additional Files

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 2025 Feb. 19];29(1):13-7. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1354

Issue

Vol. 29 No. 1 (2001)

Section

Technical Articles

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