A general design and implementation procedure for sensor-based electrical diagnostic systems for mining machinery

"Component failures in the electrical control circuits of mining machines account for a large percentage of the total downtime of the machine. Once a failure has occurred it is always a tedious and usually a time-consuming task to locate the failed component. Moreover. the pressure to quickly locate the cause of a delay can lead to compromises in safety. Thus an onboard diagnostic system. essential for an automated machine, would be a very useful addition to existing machines. This report details U.S. Bureau of Mines development of a generic procedure for synthesizing diagnostic systems for electrical-control-circuit failures in mining machinery. A continuous mining machine is used as the testbed to illustrate the application of the developed methodology. Substantive differences among mining machine control circuits made it impossible to achieve a generic diagnostic system. but a generic approach for the synthesis of the diagnostic system was possible. As the research progressed. it became apparent that an algorithmic approach was better than an expert-system-based implementation. A prototype system was constructed and used to evaluate the diagnostic system. Prototype implementation issues are also examined." - NIOSHTIC-2NIOSHTIC no. 1000314