The noise reduction performance of oblique slits and louvers with active noise control system

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Conference Proceeding
21st International Congress on Sound and Vibration 2014, ICSV 2014, 2014, 4 pp. 3048 - 3053
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Copyright © (2014) by the International Institute of Acoustics & Vibration All rights reserved. A louver is a window blind or shutter with horizontal slats that are angled to admit light and air but keep out rain, direct sunshine, and noise. Because of the limited thickness the louvers, their sound reduction capability is usually limited, especially in the lower frequency range. The sound field inside the oblique finite thickness slit, which is the unit of the louver, is simulated with Finite Element Method and compared with the straight finite thickness aperture. The active noise control technology is applied to the oblique slit by simulation. Both the secondary sources and the error sensors are located inside the slit. It is supposed that the simulation of the sound insulation performance of the active noise cancellation slit can be improved, which will make it practical for real applications of louvers.
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