A RESEARCH PROGRAM TO REDUCE INTERIOR NOISE IN GENERAL AVIATION AIRPLANES. GENERAL AVIATION INTERIOR NOISE STUDY
The construction, calibration, and properties of a facility for measuring sound transmission through aircraft type panels are described along with the theoretical and empirical methods used. Topics discussed include typical noise source, sound transmission path, and acoustic cabin properties and their effect on interior noise. Experimental results show an average sound transmission loss in the mass controlled frequency region comparable to theoretical predictions. The results also verify that transmission losses in the stiffness controlled region directly depend on the fundamental frequency of the panel. Experimental and theoretical results indicate that increases in this frequency, and consequently in transmission loss, can be achieved by applying pressure differentials across the specimen.
Center for Research, IncorporatedKansas University, 2385 Irving Road
Lawrence, KS USA 66045
- ROSKAM, J
- Muirhead, V U
- Smith, H W
- Peschier, T D
- Publication Date: 1977-8
- Pagination: 159 p.
- TRT Terms: Acoustic generators; Acoustic properties; Aircraft cabins; Aircraft noise; Differentials (Gears); General aviation aircraft; Noise control; Panels; Pressure; Pressurization; Sound attenuation; Sound transmission; Stiffness
- Uncontrolled Terms: Noise reduction
- Old TRIS Terms: Differential pressure; Sound generators
- Subject Areas: Aviation; Vehicles and Equipment;
- Accession Number: 00174590
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NASA-CR-155153 Prog Rpt.
- Contract Numbers: NSG-1301
- Files: TRIS
- Created Date: Mar 14 1978 12:00AM