AIRFRAME SELF-NOISE: FOUR YEARS OF RESEARCH

A critical assessment of the state of the art in airframe self-noise is presented. Full-scale data on the intensity, spectra and directivity of this noise source are evaluated in the light of the comprehensive theory developed by Ffowcs-Williams and Hawkins. Vibration of panels on commercial aircraft is identified as a possible additional source of airframe noise. The present understanding and methods for prediction of other component sources - airfoils, struts, and cavities - are discussed, and areas for further research as well as potential methods for airframe noise reduction are identified. Finally, the various experimental methods which have been developed for airframe noise research are discussed and sample results are presented. (Author)

• Corporate Authors:

  Langley Research Center

  National Aeronautics and Space Administration
  Hampton, VA  United States  23665
• Authors:
  • Hardin, J C
• Publication Date: 1976-7

Media Info

• Pagination: 73 p.

Subject/Index Terms

• TRT Terms: Aircraft; Aircraft noise; Airfoils; Civil aircraft; Development; Noise; Noise control; Panels; Parts; Research; Vibration
• Uncontrolled Terms: Aircraft parts; Noise reduction; Research and development
• Old TRIS Terms: Vibration effects
• Subject Areas: Aviation; Environment; Research; Vehicles and Equipment;

Filing Info

• Accession Number: 00145780
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NASA-TM-X-73908
• Files: TRIS
• Created Date: Jan 16 1977 12:00AM