Active control of the directivity of the sound diffraction from barriers
- Publisher:
- International Institute of Acoustics and Vibration
- Publication Type:
- Conference Proceeding
- Citation:
- Proceedings of the 22nd International Congress on Sound and Vibration, 2015
- Issue Date:
- 2015-01-01
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| Qiu, Zhao - 2015 - Active control of the directivity of the sound diffraction from barriers - Proceedings of the 22th International Cong.pdf | Published version | 271.56 kB |
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Active control of the directivity of the sound diffraction from barriers is investigated in this paper where the control sources are located near the top boundary of a barrier to change its spatial diffraction properties. First, an analytical solution for calculating the primary sound field from a point source diffracted from a barrier edge is given based on the Kirchhoff-Helmholtz equation, then the strengths of the secondary point sources near the barrier top boundary are optimized to control the directivity of the diffracted sound through the barrier edge so that the sound pressure is reduced in certain directions behind the barrier. Numerical simulation results show that the proposed directivity control method is feasible and can provide better performance than that of the local control methods in terms of the far field sound reduction. The potential applications of the method include increasing the performance of the current active noise barriers or reducing speech interference from opening ceiling meeting pods in open plan offices.
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