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Hexcel’s latest Acousti-Cap sound-reducing honeycomb technology was recently tested in a joint NASA-Boeing flight test on a B737 MAX test platform, with results reported to beat expectations.
Acousti-Cap technology enables aircraft engine designers to reduce the noise from takeoff and landing without adding significant weight to the aircraft. Collaboration between Hexcel and NASA over several years led to the successful results on this latest flight test. The ability to attenuate a broader noise frequency range and increase acoustic absorption with the Hexcel liner has allowed an optimised design of the overall inlet that reduces drag and improves noise attenuation.
“Hexcel has continued investing in the evolution of Acousti-Cap product technology to improve performance and reduce cost,” says Imad Atallah, Group Product Manager for Honeycomb at Hexcel. “Collaboration with industry leaders, including NASA and Boeing, has been key to that development.”
The 2DOF (Two Degrees of Freedom) honeycomb core acoustic liner was introduced in 2008 and was subsequently adopted and installed on the Boeing 787 Dreamliner inlet, the Boeing 747-8 inlet and transcowl, and more recently on the Boeing 737 MAX inlet. This success enabled continued technology development and evolution in MDOF (Multi-Degrees of Freedom), where the acoustic septum is inserted in the honeycomb cell at different heights, as well as having two septums in honeycomb chambers. This allows for improved acoustic attenuation at a broader frequency range, as well as increased absorption.
“Hexcel’s Acousti-Cap technology has shown great performance benefits over competing technologies from the beginning,” reports Clark Smith, Director of Technology – Core Products at Hexcel. “We have continued to improve the technology through taking advantage of the single cell treatment concept, by adding capability that the industry was looking for.”
The NASA-Boeing test results are reported in Aviation Week.
Image provided by Hexel
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