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US 4,850,093 AGranted
Method of making an acoustic attenuating liner
AssigneeGrumman Aerospace Corporation
InventorCharles A. Parente
Life of this patent
Estimating the term…
Abstract
A titanium face plate is perforated by laser drilling holes therethrough. A cellular core is positioned between a sound reflecting solid back plate and the face plate.
Claims3
A method of making an acoustic attenuating liner, comprising the steps of
- perforating a metal face plate by laser drilling 11,000 to 16,000 holes per square inch therethrough thereby providing a predetermined number of holes of predetermined diameter spaced at predetermined intervals from each other for assisting in providing desired acoustic attenuation;
- and
- positioning a cellular core between a sound reflecting solid back plate and said face plate, said cellular core having a plurality of cells and said face plate having said laser drilled holes aligned with each of said cells thereby enhancing the characteristics of the acoustic attenuation.
Dependencies are inferred from the claim text.