Noise attenuation structures

US10677163B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Nikolai N. Pastouchenko · Glenville, US
• Lawrence Chih-hui Cheung · Niskayuna, US
• Umesh Paliath · Clifton Park, US
• Trevor Howard Wood · Clifton Park, US
• Hongbin Ju · Clifton Park, US

Key dates

• Filing date: Dec 6, 2017
• Grant date: Jun 9, 2020
• Expiry date: Dec 6, 2037

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2260/96
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Noise attenuation structures, such as acoustic liners for gas turbine engines, are provided. For example, an acoustic liner comprises a face sheet, a backing sheet spaced apart from the face sheet, and a plurality of cavities defined between the face and backing sheets. The cavities are defined by cavity walls. A plurality of backing sheet walls extends from the backing sheet toward the face sheet. The backing sheet walls extend adjacent the cavity walls, and the backing sheet is movable with respect to the face sheet such that the cavities have a variable depth. Other embodiments of noise attenuation structures also are provided.