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  United States 
• 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

• TRT Terms: Aerodynamic noise; Aircraft noise; Computer programs; Forecasting; Jet engines; Jet propelled aircraft; Mathematical prediction; Noise control; STOL aircraft; VTOL aircraft
• Uncontrolled Terms: Control surfaces; Noise reduction; Thrust vectoring
• Old TRIS Terms: Augmentor wings; Blown flaps; High lift; Jet engine noise; Jet plane noise; Short takeoff aircraft
• Subject Areas: Aviation; Data and Information Technology; Environment; Vehicles and Equipment;

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