United States of America As Represented by the Administrator of Nasa

Christopher J Miller

Michael G Jones

Maria A Kuczmarski

Lisa Danielle Koch

James D Heidmann

Joseph E Grady

Peter J Bonacuse

James D Kiser

James C Johnston

J Chris Johnston

Broadband acoustic absorbers may be capable providing good absorption performance between 0 and 3,000 Hz, and particularly below 1,000 Hz. Reeds may be incorporated in a single layer, multiple layers, or bundles. Such broadband acoustic absorbers may be applied for acoustic absorption in aircraft, spacecraft, residential and commercial buildings, vehicles, industrial environments, wind tunnels, or any other suitable environment or application where noise reduction is desired.

Broadband acoustic absorbers

An improved acoustic liner for turbine engines is disclosed. The acoustic liner may include a straight cell section including a plurality of cells with straight chambers. The acoustic liner may also include a bent cell section including one or more cells that are bent to extend chamber length without increasing the overall height of the acoustic liner by the entire chamber length. In some cases, holes are placed between cell chambers in addition to bending the cells, or instead of bending the cells.

Acoustic liners for turbine engines

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Rocky River, OH, United States of America

Christopher J Miller