V/STOL AIRCRAFT NOISE PREDICTION (JET PROPULSORS)

A computer program is presented for predicting the noise levels of V/STOL aircraft with jet-propulsive-lift systems. Using the equations developed in Part I of this report the noise levels may also be estimated with hand calculations. Vectored thrust, externally blown flap, upper surface blown flap, internally blown flap, and augmentor wing are the propulsive-lift concepts considered. Semi-empirical equations are derived using the test results and theories for the following aircraft noise sources: Internal engine, jet, excess (core engine), high-lift system, airframe, and auxiliary power unit. The computer program predicts the perceived noise levels and tone corrected perceived noise levels for V/STOL aircraft at any specified sideline distance for known geometrical and operational parameters. This report supersedes the earlier report No. FAA-RD-73-145, August 1973. (Author)

  • Supplemental Notes:
    • Supersedes report dated Aug 73, AD-774 794.
  • Corporate Authors:

    Lockheed-Georgia Company

    Marietta, GA  USA 
  • Authors:
    • Reddy, N N
    • Blakney, D F
    • Tibbets, J G
    • Gibson, J S
  • Publication Date: 1975-6

Media Info

  • Pagination: 327 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00143605
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FAA-RD-75-125 Final Rpt., LG75ER0054
  • Contract Numbers: DOT-FA72WA-3099
  • Files: NTIS, TRIS
  • Created Date: Nov 17 1977 12:00AM