A Method for Analysis of Electrostatic Probe Signals Relating to Jet-Engine Microdistresses.
Abstract
Various methods of data reduction to correlate electrostatic probe signals with engine gas-path distress were developed and tested. These methods consisted of counting pulse signals, monitoring turbine and compressor vibrations, examining individual pulses to determine significant characteristics, and using the integrated areas of all pulses in a given test cycle to determine the level of engine distress. The systems developed were tested using tape recorded data from a TF-41 undergoing a simulated flight endurance test at Detroit Diesel Allison Division in Indianapolis, Indiana. During the test, the LP2 turbine experienced a non-catastrophic failure due to a seal rub. Tapes recorded during the test indicate that the failure occurred over an 80 hour period in which large (350 msec long, 8 volts high) pulses were observed on accelerations. The vibration signature of the engine also changed during this period. A system which integrated the areas under the pulses showed a factor of 20 increase during the period of highest recorded distress. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1976
- Accession Number
- ADA038528
Entities
People
- William Edward Gifford Iii
Organizations
- Air Force Institute of Technology