Acoustic Absorption
AssigneeAshmere Holdings Pty Ltd.
InventorColin Ayres
Life of this patent
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Abstract
An acoustic panel (for absorbing sound) includes a first sheet with spaced microperforations, a second sheet with microperforations more widely spaced than the microperforations of the first sheet, and a first cellular core sandwiched between the first sheet and the second sheet. The panel can be spaced from a surface, such as a wall. A second cellular core can be provided between the second sheet and a third sheet. The third sheet is preferably solid without microperforations but can have microperforations. Noise Reduction Coefficient (NRC) can be 0.8.
Claims34
An acoustic panel for absorbing sound, the acoustic panel comprising:
- at least a first sheet having spaced microperforations;
- a second sheet having microperforations more widely spaced than the microperforations of the first sheet;
- and
- a first cellular core sandwiched between the first sheet and the second sheet.
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A method of absorbing multiple sound frequencies by employing a first microperforated sheet in association with a primary cell depth of a first cellular core to absorb a peak (high) frequency of sound, and a second microperforated sheet in association with a secondary cell depth provided by the first cellular core in combination with a second cellular core, or the first cellular core and an airgap, to additionally absorb a second (low) peak frequency.
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A microperforated panel absorber comprising:
- a first sheet, a second sheet and a first core structure therebetween;
- the first sheet having microperforations;
- the second sheet having microperforations;
- the first core structure having primary cells.
Dependencies are inferred from the claim text.