KC-135R rumble investigation
Abstract
The KC-135R is a modified KC-135A which has had, among other things, the engines changed from the J-57 to the new F-108-CF-100 engines. Shortly after the KC-135R began SAC flight operations, a noise problem perceived as a rumbling sound in the cabin area was found in various aircraft; i.e., Rumble. The Air Force, the aircraft manufacturer and the engine manufacturer studied the problem briefly developing a better definition of the general problem. The forcing function was determined to be the F-108 engine; however, the precise source of the noise and vibration, and the transmission path from the engine to the cabin were unknown.
- Publication:
-
Final Report
- Pub Date:
- February 1989
- Bibcode:
- 1989duoh.rept.....D
- Keywords:
-
- C-135 Aircraft;
- Engine Noise;
- Jet Engines;
- Noise Intensity;
- Resonant Vibration;
- Aircraft Compartments;
- Aircraft Industry;
- Aircraft Noise;
- Coupling;
- Engine Airframe Integration;
- Flight Tests;
- Tanker Aircraft;
- Transmittance;
- Acoustics