EXPERIMENTAL STUDY OF SMART SEGMENTED TRIM PANELS FOR AIRCRAFT INTERIOR NOISE CONTROL

✍ Scribed by S.M. HIRSCH; N.E. MEYER; M.A. WESTERVELT; P. KING; F.J. LI; M.V. PETROVA; J.Q. SUN

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 468 KB
• Volume: 231
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1999.2447

✦ Synopsis

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 #exible support. This support converts the sti! trim panel into #exibly mounted pistons which can be driven by light-weight and low-pro"le force actuators. The smart trim panel has many advantages as an acoustic source over traditional loudspeakers: it is of lower pro"le, lower mass, and requires only a simple modi"cation 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 e$ciently 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.