A RESEARCH PROGRAM TO REDUCE INTERIOR NOISE IN GENERAL AVIATION AIRPLANES: INVESTIGATION OF THE CHARACTERISTICS OF AN ACOUSTIC PANEL TEST FACILITY

Sound pressure levels in the test facility were studied that are caused by varying: (1) microphone positions; (2) equalizer setting; and (3) panel clamping forces. Measurements were done by using a Beranek tube or this Beranek tube in combinations with an extension tube and a special test section. In all configurations tests were executed with and without a test panel installed. The influence of the speaker back panel and the back panel of the Beranek tube on the sound pressure levels inside the test tube were also investigated. It is shown that the definition of noise reduction is more useful in relation to this test facility than transmission loss.

  • Corporate Authors:

    Center for Research, Incorporated

    Kansas University, 2385 Irving Road
    Lawrence, KS  USA  66045
  • Authors:
    • Grosveld, F
    • Vanaken, J
  • Publication Date: 1978-9

Media Info

  • Pagination: 151 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00186555
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NASA-CR-157587
  • Contract Numbers: NSG-1301
  • Files: TRIS
  • Created Date: Feb 27 1979 12:00AM