Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2011-05-10
2011-05-10
Enad, Elvin G (Department: 2832)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S213000, C181S290000, C181S292000
Reexamination Certificate
active
07938224
ABSTRACT:
A coating for acoustic treatment relative to an aircraft's surface, in particular a leading edge such as an air intake of an aircraft nacelle, includes an acoustically resistive layer, at least one alveolar structure (30), and a reflective layer. The alveolar structure (30) includes a number of tubes that empty out, on the one hand, at a first imaginary surface (34), and, on the other hand, at a second imaginary surface (36). The alveolar structure (30) includes cut-outs or openings (38) made at the side walls of certain tubes that make it possible to link adjacent tubes so as to create a network of communicating tubes that isolate at least one tube or a group of non-communicating tubes, whereby at least one of the communicating tubes is connected to at least one hot gas intake (40).
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International Search Report dated Sep. 29, 2008, from corresponding PCT application.
Duprieu Bernard
Frustie Valerie
Gantie Fabrice
Airbus Operations (SAS)
Enad Elvin G
Phillips Forrest M
Young & Thompson
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