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US 12,694,860 B2Granted
Metamaterial acoustic barrier using vortex generation for internal circulation
AssigneeThe United States of America as represented by the Secretary of the Army
InventorMichael V. Scanlon
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Abstract
Metamaterials that may reduce or modify the spectrum of acoustic energy or power (and/or other types of fluid energy or power) via an array of circulation elements, such as vortex diodes are described. Circulation elements may be arranged in various types of arrays (e.g., serial, parallel, etc.) that may be able to form various differently shaped metamaterial elements (e.g., sheets, boxes, tubes, etc.) appropriate for various different applications.
Claims20
A sound modifying metamaterial, comprising:
- acoustically coupled circulation elements, each circulation element comprising:
- helical circulation volume extending between the inlet and the outlet,
- the helical circulation volume being configured to define a continuous sound propagation path.
A bi-directional sound modifying metamaterial comprising:
- an array of circulation elements, each circulation element comprising:
- a first inlet plate comprising a first set of inlets;
- a first circulator plate coupled to the first inlet plate;
- an outlet plate comprising a set of outlets, wherein the outlet plate is coupled to the first circulator plate;
- a second circulator plate coupled to the output plate;
- a second inlet plate comprising a second set of inlets coupled to the second circulator plate.
3 more elements
A method comprising:
- evaluating a sound type;
- determining a set of vortex diode attributes;
- determining a shape of a metamaterial;
- and
- arranging a plurality of vortex diodes in an array along the metamaterial.
2 more elements
Dependencies are inferred from the claim text.