Accession Number : ADA131462

Title :   YC-15 EBF (Externally-Blown Flap) STOL (Short Takeoff and Landing) Airplane Fuselage and Interior Noise Environment.

Descriptive Note : Final technical rept. Oct 81-Feb 83,

Corporate Author : AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH

Personal Author(s) : Miller,Vincent R

PDF Url : ADA131462

Report Date : May 1983

Pagination or Media Count : 81

Abstract : The purpose of this effort was to investigate the exterior fuselage and interior noise of the USAF/McDonnell-Douglas YC-15 Advanced Medium-Range Short-Takeoff- and Landing Transport airplane. This aircraft employs an under-the-wing, externally-blown-flap powered lift system designed to create augmented lift, which creates an intense acoustic environment. The blowing of the flap produces higher noise levels at lower frequencies than does the jet alone, increasing the acoustic environment of the fuselage and inside the cabin. A combination of exterior flush-mounted microphones, accelerometers, interior centerline and sidewall microphones were used during this investigation. Test conditions analyzed included takeoff, cruise, landing, taxi, and ground static over the full range of operating conditions. The effects of different flight parameters are displayed in the form of the octave, one-third octave, and narrowband plots and are compared to the changes on the acoustic environment. (Author)

Descriptors :   *Short takeoff aircraft, *Flaps(Control surfaces), *Noise, Fuselages, Aircraft cabins, External, Internal, Level(Quantity), Acoustics, Noise reduction, Transport aircraft, Powered lift, Environments, Acoustic measurement, Test equipment, Test methods

Subject Categories : Transport Aircraft
      V/STOL
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE