A high performance rig designed to test gears (materials and geometries) in extreme load and speed conditions - as in aerospace applications - was used to test diagnostic systems by the only vibration analysis. The authors of the present report have implemented, in addition to standard signal analysis techniques, some advanced methodologies (e.g. NA4, NB4), which are applied to the synchronously averaged signal as to detect the smallest fault related to vibration variations of the tested gears signature. The different techniques have been tested and compared with the gear signals that underwent failure, showing the good performances of the latter approaches compared to the more conventional ones. A numerical simulation of the gear meshing was carried out as to support the experimental campaign and the benchmarking of the diagnostic tools. The stiffness computed by the FEM code was employed to simulate the gear system dynamic behavior with a lumped model, which was finally tuned using the experimental signals, as to acquire indications on the crack evolution.
Vibration signature analysis of real and virtual damaged gears
BARSANTI, MICHELE;FORTE, PAOLA;
2006-01-01
Abstract
A high performance rig designed to test gears (materials and geometries) in extreme load and speed conditions - as in aerospace applications - was used to test diagnostic systems by the only vibration analysis. The authors of the present report have implemented, in addition to standard signal analysis techniques, some advanced methodologies (e.g. NA4, NB4), which are applied to the synchronously averaged signal as to detect the smallest fault related to vibration variations of the tested gears signature. The different techniques have been tested and compared with the gear signals that underwent failure, showing the good performances of the latter approaches compared to the more conventional ones. A numerical simulation of the gear meshing was carried out as to support the experimental campaign and the benchmarking of the diagnostic tools. The stiffness computed by the FEM code was employed to simulate the gear system dynamic behavior with a lumped model, which was finally tuned using the experimental signals, as to acquire indications on the crack evolution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
