Broadband acoustic absorbers
First Claim
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1. An apparatus, comprising:
- acoustic absorber panels located on a plurality of sides of a body to be acoustically dampened, wherein each acoustic absorber panel comprises;
at least one cubic retainer, wherein the cubic retainer is open to a surrounding gaseous environment and capable of receiving sound waves to be acoustically dampened, the cubic retainer comprising;
at least one solid side; and
at least one perforated side permitting sound waves in the surrounding gaseous environment to enter the cubic retainer; and
an acoustic absorber layer disposed within the cubic retainer and comprised of a plurality of reeds, wherein;
the plurality of reeds each comprise a first end, a second end, and a length disposed between the first end and the second end;
the plurality of reeds are natural reeds, synthetic reeds, or a combination of natural and synthetic reeds;
the plurality of reeds are fixed at one end, wherein the length of each of the reeds is substantially perpendicular to the sound waves entering the cubic retainer; and
the plurality of reeds are each open on at least one end to the surrounding gaseous environment;
wherein sound waves entering the cubic retainer are acoustically dampened by the acoustic absorber layer.
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Abstract
Broadband acoustic absorbers may be capable providing good absorption performance between 0 and 3,000 Hz, and particularly below 1,000 Hz. Reeds may be incorporated in a single layer, multiple layers, or bundles. Such broadband acoustic absorbers may be applied for acoustic absorption in aircraft, spacecraft, residential and commercial buildings, vehicles, industrial environments, wind tunnels, or any other suitable environment or application where noise reduction is desired.
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Citations
18 Claims
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1. An apparatus, comprising:
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acoustic absorber panels located on a plurality of sides of a body to be acoustically dampened, wherein each acoustic absorber panel comprises; at least one cubic retainer, wherein the cubic retainer is open to a surrounding gaseous environment and capable of receiving sound waves to be acoustically dampened, the cubic retainer comprising; at least one solid side; and at least one perforated side permitting sound waves in the surrounding gaseous environment to enter the cubic retainer; and an acoustic absorber layer disposed within the cubic retainer and comprised of a plurality of reeds, wherein; the plurality of reeds each comprise a first end, a second end, and a length disposed between the first end and the second end; the plurality of reeds are natural reeds, synthetic reeds, or a combination of natural and synthetic reeds; the plurality of reeds are fixed at one end, wherein the length of each of the reeds is substantially perpendicular to the sound waves entering the cubic retainer; and the plurality of reeds are each open on at least one end to the surrounding gaseous environment; wherein sound waves entering the cubic retainer are acoustically dampened by the acoustic absorber layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An acoustic absorber panel, comprising:
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at least one cubic retainer, wherein the cubic retainer is open to a surrounding gaseous environment, the cubic retainer comprising; at least one solid side; and at least one perforated side, wherein the at least one solid side is opposite the at least one perforated side; and an acoustic absorber layer disposed within the cubic retainer and comprised of a plurality of reeds, wherein; the plurality of reeds each comprise a first end, a second end, and a length disposed between the first end and the second end; the plurality of reeds are natural reeds, synthetic reeds, or a combination of natural and synthetic reeds; the plurality of reeds are fixed on the first end to a side of the cubic retainer, wherein the length of each of the reeds is substantially perpendicular to the sound waves entering the cubic retainer; and the plurality of reeds are each open on at least one end to the surrounding gaseous environment, wherein sound may attenuate through the at least one open end. - View Dependent Claims (14, 15, 16)
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17. A broadband acoustic absorber panel, comprising:
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an acoustic absorber layer; and a porous, hydrophobic, and/or oleophobic membrane positioned on at least one side of the acoustic absorber layer, wherein the acoustic absorber layer comprises; at least one cubic retainer, wherein the cubic retainer is open to a surrounding gaseous environment to receive sound waves to be acoustically dampened, the cubic retainer comprising; at least one solid side; and at least one perforated side permitting sound waves in the surrounding gaseous environment to enter the cubic retainer; and a natural or synthetic bulk absorber, natural reeds, synthetic reeds, or any combination thereof. - View Dependent Claims (18)
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Specification