Acoustic article
Assignee3M Innovative Properties Company
InventorsTatjana Stecenko, Olester Benson, Jr., Tongyang Shi, Pingfan Wu, James M. Jonza
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Abstract
Provided is an acoustic article and related methods of manufacture and use. The acoustic article includes a continuous layer having a first elastic stiffness, and a plurality of distributed masses disposed on a major surface of the continuous layer having a second elastic stiffness. The second elastic stiffness can be less than the first elastic stiffness to provide an acoustic metamaterial displaying an anti-resonance peak at a frequency below 800 Hz. The acoustic article can be made using efficient and scalable processes for manufacturing low frequency acoustic barrier materials.
Claims18
An acoustic article comprising:
- a continuous layer having a first elastic stiffness;
- and
- a plurality of distributed masses disposed on a major surface of the continuous layer having a second elastic stiffness, wherein the second elastic stiffness is less than the first elastic stiffness, and
- wherein the acoustic article is an acoustic metamaterial displaying an anti-resonance peak at a frequency below 800 Hz, and
- wherein the continuous layer has an elastic modulus of from 500 MPa to 5000 MPa.
A method of making an acoustic article, the method comprising:
- embossing a flat film to provide a molding surface comprising a plurality of defined recesses;
- applying to the molding surface a reactive monomer mixture that at least partially fills the plurality of defined recesses;
- removing at least some excess reactive monomer mixture above the molding surface;
- and
- curing the reactive monomer mixture to obtain a plurality of distributed masses adhered to the molding surface.
An acoustic article comprising:
- a continuous layer having a first elastic modulus;
- and
- a plurality of distributed masses disposed on a major surface of the continuous layer having a second elastic modulus, wherein the second elastic modulus is less than the first elastic modulus, and
- wherein the acoustic article is an acoustic metamaterial displaying an anti-resonance peak at a frequency below 800 Hz, and
- wherein the continuous layer has an elastic modulus of from 500 MPa to 5000 MPa.
Dependencies are inferred from the claim text.