The proposed project will demonstrate unique digital signal processing software for automated, early detection of Widespread Fatigue (WF) damaging in turbine engine disks. The software, known as RVMD, is based on recently patented technology in Rotational Vibration Monitoring (RVM). RVMD will measure loss of disk structural rigidity due to WF defects, both from High Cycle and Low cycle Fatigue. Commercial applications include maintenance checks and in-flight monitoring. By detecting WF, R VMD will help prevent disk failures and improve safety for the flying public. Phase_I will show RVMD detects reactive disk resonance modes in a model bladed disk by processing tachometer signals, without using traditional vibration sensors. It has two objectives:1) identify 0D, 1D and 0C disk modes;2) measure mode shifts due to simulated fatigue cracking.Two commercial engine manufacturers have committed to Phase_II. to date, the original RVM algorithm has been applied successfully in detecting blade and shaft resonances in axial flow compressors, industrial prop fans, and electric power turbines. Currently, RVM is also being applied to HCF detection in engine fan blades with Air Force support.Commercial Applications:Results will be digital signal processing software that processes engine tachometer signals in maintenance depots, or eventually, in flight to detect widespread fatigue damage in engine disks. This technology will find application in monitoring all types of commercial and military turbine engines. It will improve passenger safety and maintenance productivity for commercial air carriers.
