Air-transparent selective sound silencer using ultra-open metamaterial
AssigneeTrustees of Boston University
InventorsXin Zhang, Reza Ghaffarivardavagh, Stephan Anderson
Life of this patent
Estimating the term…
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 two or more metamaterial silencers, each such metamaterial silencer comprising a first channel open to the propagation of a target frequency therethrough and configured to remain in a continuum state during propagation of the target frequency therethrough, and a second channel open to propagation of the target frequency therethrough and configured to resonate at the target frequency, wherein said second channel is disposed, relative to said first channel, such that the target frequency of said second channel is capable of destructively interfering with the target frequency of said first channel;
- wherein a first metamaterial silencer comprises a first channel configured to remain in a continuum state during propagation of a first target frequency therethrough and a second channel configured to resonate at the first target frequency, and wherein
- a second metamaterial silencer comprises a first channel configured to remain in a continuum state during propagation of a second target frequency therethrough and a second channel configured to resonate at the second target frequency;
- wherein said second metamaterial silencer is disposed in series with said first metamaterial silencer;
- and
- wherein the first target frequency is different from the second target frequency.
Dependencies are inferred from the claim text.