US 10,482,865 B2 · Vibration damped sound shield

Abstract

A sound absorption panel (201) is constructed on an acoustically thin sheet (203) to provide an acoustic/vibrational energy absorption metamaterial structure. A plurality of dampers (101) are fixed to the acoustically thin sheet (203), and at least a subset of said dampers (101) comprise a support (103) and a flexible membrane (105) supported by the support. The flexible membrane (105) has one or more masses or platelets (107) attached. The dampers (101) in combination with the sheet (203) result in absorption of energy of movement of the sheet (203) resulting from sound transmission or vibrations across the sheet.

Claims20

Dependent claims

An acoustic/vibrational energy absorption metamaterial comprising:

a substantially air impermeable flexible sheet (203);
and
a plurality of dampers (101) fixed to the flexible sheet, at least a subset of the dampers comprising:
an enclosed planar frame (103);
an flexible, membrane (105) attached to said frame;
and
at least one rigid or semi-rigid mass or platelet (107) having an asymmetrical shape when taken in a plan view facing the thin sheet and fixedly attached to said flexible membrane by an asymmetrical hinge attachment so as to induce a flapping motion about the hinge attachment, the masses or platelets providing a restoring force exerting by the flexible membrane upon displacement of the dampers on the sheet, wherein at least a subset of the dampers present plural resonant modes with tunable resonant frequencies.

4 more elements

A method of attenuating sound or vibrations, the method comprising:

providing a substantially air impermeable acoustically thin sheet;
and
providing a plurality of dampers fixed to the acoustically thin sheet, wherein at least a subset of said dampers each comprise a support and a flexible membrane supported by the support and have a plurality rigid or semi-rigid of masses or platelets having an asymmetrical shape when taken in a plan view facing the thin sheet and fixedly attached thereto by an asymmetrical hinge attachment so as to induce a flapping motion about the hinge attachment, wherein the dampers in combination with the sheet absorb energy of movement of the sheet resulting from sound transmission or vibrations across the sheet.

Dependencies are inferred from the claim text.

Facts

Application

15/402,470Filed 10 Jan 2017 · continuation in part

Priority

20 Aug 2014

Published

US 2017/0116976 A127 Apr 2017

Granted

19 Nov 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

G10K 11/172
Methods or devices for protecting against, or for damping, noise or other acoustic waves in general: using resonance effects
B32B 3/085
Characterised by added members at particular parts: spaced apart pieces on the surface of a layer
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
G10K 11/162
Methods or devices for protecting against, or for damping, noise or other acoustic waves in general: selection of materials

Vibration damped sound shield

Life of this patent

Vibration damped sound shield

Life of this patent

Abstract

Claims20