Effect of the ground surface and meteorological conditions on the active control of a monopole noise source

Authors

  • Ann Nakashima Dept. of Mechanical Engineering, Sch. of Occup. and Environ. Hygiene, The University of British Columbia, 3rd Floor, 2206 East Mall, Vancouver, BC V6T 1Z3, Canada
  • Murray Hodgson Dept. of Mechanical Engineering, Sch. of Occup. and Environ. Hygiene, The University of British Columbia, 3rd Floor, 2206 East Mall, Vancouver, BC V6T 1Z3, Canada

Keywords:

Acoustic fields, Acoustic noise, Acoustic wave refraction, Aircraft propellers, Attenuation, Control systems, Earth atmosphere, Green's function, Thermal gradients, Wind effects, Green function parabolic equation method, Monopole noise source, Temperature inversion, Wind speed

Abstract

Atmospheric refraction and soft ground have a significant effect on the performance of a single-channel active noise control (ANC) system. However, under such conditions the noise levels near the ground were significantly attenuated due to the upward refraction of sound waves. It would be more important to concentrate on attenuating the noise under temperature inversion and downwind conditions.

Additional Files

Published

2003-09-01

How to Cite

1.
Nakashima A, Hodgson M. Effect of the ground surface and meteorological conditions on the active control of a monopole noise source. Canadian Acoustics [Internet]. 2003 Sep. 1 [cited 2024 Oct. 7];31(3):88-9. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1564

Issue

Vol. 31 No. 3 (2003)

Section

Proceedings of the Acoustics Week in Canada

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