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US 12,352,190 B2Granted
Air-transparent selective sound silencer using ultra-open metamaterial
AssigneeTrustees of Boston University
InventorsXin Zhang, Reza Ghaffarivardavagh, Stephan Anderson
Life of this patent
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Abstract
A bilayler metamaterial silencer allows substantial fluid through the apparatus, while mitigating the propagation of sound through the apparatus, and while providing a form factor that is significantly more compact than previously-known devices. Moreover, illustrative embodiments allow a designer to specify one or both of the frequency or frequencies at which the apparatus mitigates sound propagation, and/or the bandwidth around the frequency or frequencies at which the apparatus mitigates sound propagation.
Claims10
An apparatus comprising:
- a first channel open to the propagation of a first target frequency and a second target frequency therethrough, said first channel configured to remain in a continuum state during propagation of the first target frequency and the second target frequency therethrough;
- two or more second channels, wherein
- a first of said second channels is open to the propagation of the first target frequency, and configured to resonate at the first target frequency, and
- a second of said second channels is open to the propagation of the second target frequency, and configured to resonate at the second target frequency;
- wherein said two or more second channels are disposed relative to the first channel such that:
- the first target frequency of the first of said second channels is capable of destructively interfering with the first target frequency of said first channel, and
- the second target frequency of the second of said second channels is capable of destructively interfering with the second target frequency of said first channel;
- and
- wherein the first target frequency is different from the second target frequency.
6 more elements
Dependencies are inferred from the claim text.