Reactive acoustic silencer
AssigneeVibron Limited
InventorsDonald L. Allen, Robert D. Stevens
Life of this patent
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Abstract
An acoustic duct silencer is disclosed having opposed sidewall baffles which are disposed in a duct such that a cavity is defined between the baffles and the adjacent duct sidewalls, the space between the baffles bordering a passageway in the duct for the flow of a fluid medium therethrough. Each baffle features an array of generally parallel, spaced-apart elongate slots which substantially span the vertical or horizontal breadth of the baffles. The baffles preferably have a relatively large effective thickness so that the slots formed therein have a significant depth to them. In this manner, an integral array of resonators are provided having a significant slot or throat depth for the attenuation of low frequency sound.
Claims17
An acoustic silencer for use in a duct having opposed, upstanding sidewalls, comprising:
- a pair of opposed sidewall baffles, each baffle being located adjacent to one of the duct sidewalls, each baffle including a planar center wall portion disposed generally parallel to and spaced from the duct sidewall adjacent thereto, each baffle including end portions for connection to the adjacent sidewall such that a cavity is defined between the center wall portion and the adjacent duct sidewall, the opposed baffles defining therebetween a passageway in the duct for the flow of a fluid medium therethrough,
- wherein said center wall portion of each baffle includes a plurality of generally parallel and substantially uniformly spaced apart slots, each slot spanning the breadth of the center wall portion, the slots collectively providing a porosity in the range of about 1% to 10% of the total area of the center wall portion.
Dependencies are inferred from the claim text.