Helicopter Bearing Failure Detection Utilizing Shock Pulse Techniques.
Abstract
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 than 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
- Sep 20, 1977
- Accession Number
- ADA057308
Entities
People
- Harold W. Sutphin
- J. Thomas Harrington
- John A. George
- Timothy C. Mayer