Actively-controlled sound absorption panel system using...

Details Actively-controlled sound absorption panel system using... Actively-controlled sound absorption panel system using...

2007-05-01

2007-05-01

Nguyen, Ninh H. (Department: 3745)

Rotary kinetic fluid motors or pumps

With inspection, signaling, indicating or measuring means

C415S119000, C415S126000

Reexamination Certificate

active

09987907

ABSTRACT:
A space4constituted by a sound absorption panel section1and active sound absorption control system section2between the inner and outer walls of a nacelle forming an engine intake/exhaust duct is utilized as an acoustic resonance field and as a sound absorption field by sticking a porous sound absorption material14onto the inside wall surface of the space. The panel section1defines a sound absorption space by means of surface plate6made of a perforated plate and wire mesh materials plate, panel construction side plate9and back sheet plate13having porous sound absorption material stuck thereon; and a movement-controlled reflective plate8, that is capable of movement/rotation control with respect to said perforated plate, is provided within this sound absorption space. Movement of the reflective plate8is controlled utilizing the adaptive feed forward control method by means of the output from an active sound absorption control system section2.

REFERENCES:
patent: 5415522 (1995-05-01), Pla et al.
patent: 5979593 (1999-11-01), Rice et al.
patent: WO9611465 (1996-04-01), None
patent: WO9612269 (1996-04-01), None
patent: 10-97261 (1998-04-01), None

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