Vibro Acoustics Three-dimensional Drum Silencers

By Author: Kevin Richard
Total Articles: 252
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When low frequency sound travels through a duct in which a segment of hard walls is replaced by the membranes backed by side branch cavities, they are reflected as a result of sound radiation by the induced membrane vibration.
The reflection is effective over a wide frequency band when high tension is applied in the avail direction of the duct. The device is thereby known as a drum silencer, and its existing Vibro acoustics theory is based on a two-dimensional model in which the membrane behaves like a string. This study extends over the theory of three dimensions, in which the membrane covers a finite rectangular activity with all edges fixed. It is shown analytically and validated experimentally that the fixed edges of the drum silencer have no impact on the silencing performance of the device working in the cutoff frequency duct range and when there is no tension in the transverse direction. Finite element method is used to stimulate the complete fluid membrane coupling and the results are validated by known solutions. The validated numerical technique is ...
... then applied to display the acoustic advantage of using a circular activity for a rectangular duct.
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