Noise attenuation device

US6450289B1 · kind B1 · utility

Inventors

• Christopher Field · Baltimore, US
• Fergus Fricke · Forbes, AU

Key dates

• Filing date: Sep 5, 2001
• Grant date: Sep 17, 2002
• Expiry date: Sep 5, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F24F2013/245
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A noise attenuation device having an array of quarter wave resonators which have varying mouth widths disposed adjacent an aperture or ventilation opening having a predefined width. The resonators are tuned to a resonant frequency, increasing from one face of the attenuation device to another, and so that the mouth widths are each greater than the width of the aperture or ventilation opening, respectively. Optionally, a second array tuned to a different frequency may be disposed on the opposite side of the aperture and the aperture may be kinked so that there is no direct line of sight through the device.