Increasing the performance of active noise control systems on ground with a finite size vertical reflecting surface
- Publication Type:
- Journal Article
- Citation:
- Applied Acoustics, 2019, 154 pp. 193 - 200
- Issue Date:
- 2019-11-01
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© 2019 Elsevier Ltd This paper investigates the feasibility of increasing the noise reduction performance of active noise control systems on ground by introducing a finite size reflecting surface vertical to the ground. By using the image source method and the disk scattering model, the sound radiation power of an active noise control system on ground with an additional finite size semicircular rigid disk vertical to the ground is studied. It is found that the noise reduction of the system can be increased significantly with the infinitely large reflecting surface when the primary and secondary source distance is less than half of the wavelength at the frequency of interest, and the finite size disk can further increase the noise reduction performance at certain bandwidth by up to 2.3 dB. The mechanisms for the performance increase are explored, and the experimental results are presented to validate the analytical and simulation results.
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