Multi-degree linear liner impedance testing device

Details Multi-degree linear liner impedance testing device Multi-degree linear liner impedance testing device

1992-01-29

1995-01-03

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73588, G01N 2900

Patent

active

053775465

ABSTRACT:
A device for permitting evaluation of the acoustic impedance of liner designs used to attenuate noise in engine aircraft inlet and exhaust ducts, and in particular multiple degree of freedom designs of the type which include a porous facesheet followed by a backing depth followed by successive facesheet/backing depth combinations, includes a plurality of spacers of different thicknesses for varying the backing depths, and a movable plunger with a threaded adjustment mechanism for establishing the final backing depth. Gaskets and seals are installed at various interfaces to eliminate noise leakage paths. Two attachment bolts are used to hold the plunger assembly, face sheets, and spacers together, and an alignment disc positioned on the first facesheet is used to properly align an impedance tube waveguide on facesheet.

REFERENCES:
patent: 2981096 (1956-12-01), Carrell
patent: 4305295 (1981-12-01), Andersson et al.
patent: 4397187 (1983-08-01), Stribling
patent: 4537630 (1985-08-01), Syed
patent: 4651566 (1987-03-01), Andersson et al.
patent: 4768379 (1988-09-01), Arcas et al.

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