SPADE Sensor Location and Attachment.
Abstract
This report optimizes sensor locations for the shock pulse vibration technique, investigates the shock emission profile difference between using an IFD multi-model transducer using an epoxy mounting technique vs a B and K accelerometer using a collar and damp technique and finally the recommendation of candidate bearings for shock pulse monitoring on the UH-1H, AH-1G, OH-58C and the CH-47. The Shock Pulse technique works on the principle that a descrete 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 thorugh 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 procides the frequency of peaks above any desired peak amplitudes. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 27, 1978
- Accession Number
- ADA054907
Entities
People
- Harold W. Sutphin
- J. Thomas Harrington
- Timothy C. Mayer