Development of a Diagnostic System for Off-Highway Vehicle Power Trains.

摘要

An earlier report prepared under Contract DAAK02-74-C-0084 investigated the feasibility of utilizing high frequency vibration analysis to diagnose power train condition in off-highway vehicles. The problem was conducted on Caterpillar D8H crawler tractors and the results were promising. The present program investigates the commonality of the data from a D8 and a smaller crawler tractor the D7. Based on the data from the D8, a spectral region between 20 KHz and 50 KHz was selected. This wide band width did not work for the D7 due to the presence of high level signals during steady-state operation in the 5 KHz to 35 KHz region. It was found that if the band width was limited to 40 KHz to 50 KHz, the diagnostic technique would apply equally well to both the D7 and D8 tractor. An engineering model of a diagnostic system was built and tested that will operate on both the Caterpillar D7 and D8 crawler tractors. (Author)