Browse Prior Art Database

Noise Reduction Window Structure

IP.com Disclosure Number: IPCOM000050813D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Varmha, R: AUTHOR [+2]

Abstract

Resonators are used with a dual-pane window structure for increased noise reduction.

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Noise Reduction Window Structure

Resonators are used with a dual-pane window structure for increased noise reduction.

A window structure for covers of a machine, such as a printer, comprises dual panes 10 and 11 bonded to a frame separator 12. The window has reduced sound attenuation at certain frequencies due to coincidence effects and the resonant coupling of the panes 10 and 11 by the air mass 13 between them. The location of these frequencies in the spectrum is a function of the interpane spacing and the window material, dimensions, surface mass and density and edge mounting condition.

Helmholtz resonators are used to increase the acoustic attenuation properties of the window. In Figs. 1 and 2, Helmholtz resonators have a cylindrical chamber 14 connected by tube 15 threaded through separator 12. In Fig. 3, the Helmholtz chamber 16 and connecting tube 17 are formed directly in the separator 12. The resonators can be designed to reduce noise over a specific narrow range of frequencies, or several resonators operative at different narrow frequency ranges can be combined at several locations of the window to attenuate noise over a wide range of frequencies.

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