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. Keywords: Aircraft engine vibration; Low frequency vibration; Flight test; Acoustic intensity; Modal analysis; Engine vibration; Engine/airframe; Resonant coupling; Jet engines. (kt)
KC-135R Rumble Investigation
1989
252 pages
Report
Keine Angabe
Englisch
Aircraft , Jet & Gas Turbine Engines , Noise Pollution & Control , Tanker aircraft , Aircraft noise , Aircraft engine noise , Acoustic signals , Air force , Aircraft cabins , Aircraft industry , Airframes , Coupling(Interaction) , Flight testing , Intensity , Jet engines , Low frequency , Low level , Paths , Precision , Resonance , Sources , Transmittance , Vibration , J-57 Aircraft engines , F-108 Aircraft engines , CF-100 Aircraft engines , KC-135R Aircraft
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