AIRFRAME AERODYNAMIC NOISE -- TOTAL RADIATED ACOUSTIC POWER APPROACH

Using a total radiated acoustic power approach, this study deals with the airframe noise, associated with movement of the aircraft through the atmosphere. Methodology was developed to accurately calculate the total acoustic power by using measurements from an array of microphones during aircraft flyover. This methodology was applied to Schweizer 2-32 glider flyovers and it was found that for an aerodynamic configuration (no flaps, wheels, wheel wells, etc.) the total acoustic power can be obtained from one flyover measurement by assuming the directivity is nearly equal in all directions. This assumption was shown to be valid for the glider and is assumed valid for any aircraft in an aerodynamic configuration.

• Corporate Authors:

  Air Force Flight Dynamics Laboratory

  Wright-Patterson Air Force Base
  Dayton, OH  United States  45433
• Authors:
  • Shaw, L L
• Publication Date: 1978-11

Media Info

• Pagination: 79 p.
• Serial:
  • Air Force Flight Dynamics Laboratory Technical Rpt
  • Publisher: Air Force Flight Dynamics Laboratory

Subject/Index Terms

• TRT Terms: Acoustic measuring instruments; Acoustics; Aerodynamic noise; Aerodynamics; Aircraft; Aircraft noise; Airframes; Noise; Overpasses; Wind powered aircraft
• Identifier Terms: Schweizer aircraft
• Uncontrolled Terms: Gliders (Aircraft)
• Old TRIS Terms: Acoustic measurement; Acoustic power; Aerodynamic configuration
• Subject Areas: Aviation; Environment; Vehicles and Equipment;

Filing Info

• Accession Number: 00194707
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: AFFDL TR 78-141
• Files: TRIS
• Created Date: Jun 13 1979 12:00AM