A smart trim panel used as a secondary source for active noise control in aircraft is developed and tested. The smart trim panel is a rectangular segment of aircraft trim panel which is suspended by a flexible support. This support converts the stiff trim panel into flexibly mounted pistons which can be driven by light-weight and low-profile force actuators. The smart trim panel has many advantages as an acoustic source over traditional loudspeakers: it is of lower profile, lower mass, and requires only a simple modification of materials already installed on aircraft. The static and dynamic properties of a smart trim panel are studied, verifying that when subjected to low-frequency (< 500 Hz) excitation, it vibrates in the efficiently radiating piston mode. Real-time active noise control experiments are conducted in a laboratory-scale fuselage model using the smart trim panels as secondary sources. Global attenuation of sound pressure levels of up to 15 dB is realized.
Experimental study of smart segmented trim panels for aircraft interior noise control
Experimentelle Untersuchung von intelligenten, segmentierten Trimmpaneelen für die Regelung des Innengeräusches in Flugzeugen
Journal of Sound and Vibration ; 231 , 4 ; 1023-1037
2000
15 Seiten, 12 Bilder, 34 Quellen
Article (Journal)
English
Experimental study of smart segmented trim panels for aircraft interior noise control
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