Shock Pulse Meter Analysis.
Abstract
This report contains Shock Pulse data on the tailrotor hanger bearing, the forty-two degree gearbox, and the ninety degree gearbox. Also this report contains a preliminary study of using the shock pulse technique on the OH-58A and on determining the condition of gears in the 42 degree gearbox. The Shock Pulse technique works on the principle that a discrete fault, such as a pit or a spall, will cause repetitive impacts of short duration. These impacts will cause shock waves to propagate through the bearing structure causing a pulse displacement input to an accelerometer, suitably, attached to the bearing structure. The output of the accelerometer passes through a high gain amplifier tuned at the resonant frequency of the accelerometer (this amplifier then acts as a sharp band-pose filter). After the signal is processed the output is displayed on a counter which provides the frequency of peaks above any desired peak amplitudes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 15, 1974
- Accession Number
- ADA060069
Entities
People
- Edward F. Covill
- J. Thomas Harrington
- John A. George
- Timothy C. Mayer