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. Keywords: Aircraft engine vibration; Low frequency vibration; Flight test; Acoustic intensity; Modal analysis; Engine vibration; Engine/airframe; Resonant coupling; Jet engines. (kt)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 27, 1989
- Accession Number
- ADA207532
Entities
People
- Dennis G. Davis
- Michael L. Drake
Organizations
- University of Dayton