VIBRATS

This research identified a methodology for locating nontraditional frequencies of deteriorating rotating components and their locations as related to AH-64 tail rotor components as mounted to the TRDT test stand. For these selected frequencies, this research also illustrated the importance of load monitoring, the influences of shaft misalignment, shaft's imbalances and their effects on vibration signatures and the importance of flight regime recognition. The plan for this research was to devise a way of extracting useful power train information from the test data in order to reduce the amount of false alarms while increasing the ability to detect faults for the last three stages of bearing fault progression... In 2005 a unique opportunity presented itself, one that consisted of studying a 17 component Apache (AH-64) tail rotor drive train (TRDT) system's vibrations for the purpose of improving the Army's Condition Based Maintenance (CBM) program, a program established to monitor..