Scuffing failures may appear in an unexpected way, owing to major or minor dynamic overload effects. In this paper some experimental results obtained during a scuffing test campaign on aerospace spur gear are analyzed, with the aim to correlate these dynamic effects with the sudden development of scuffing. An accurate though simple dynamic model simulating the torsional behaviour the test rig was developed. In particular the meshing stiffness of the test gears was calculated as function of the gear angular position, for different load conditions. The other components of the test rig (slave gears, shafts, etc.) were considered in a lumped parameter model. The dynamic simulation of the reduced system provided the time history of the loads between the test gear teeth. In this way, it was possible to analyze the correlation between the resonance conditions (and related dynamic overloads) and both the vibratory behaviour of the rig, as measured through several accelerometers, and the observed scuffing phenomena. Moreover, it was possible to determine the effect of this dynamic behaviour on some indicators and to verify whether the prediction of scuffing predictions could be improved when the actual loads are used.
Simulation of the dynamic overload of a gear transmission for scuffing failure prediction
FORTE, PAOLA;MANFREDI, ENRICO;MAZZITELLI, ISIDORO FRANCESCO;
2010-01-01
Abstract
Scuffing failures may appear in an unexpected way, owing to major or minor dynamic overload effects. In this paper some experimental results obtained during a scuffing test campaign on aerospace spur gear are analyzed, with the aim to correlate these dynamic effects with the sudden development of scuffing. An accurate though simple dynamic model simulating the torsional behaviour the test rig was developed. In particular the meshing stiffness of the test gears was calculated as function of the gear angular position, for different load conditions. The other components of the test rig (slave gears, shafts, etc.) were considered in a lumped parameter model. The dynamic simulation of the reduced system provided the time history of the loads between the test gear teeth. In this way, it was possible to analyze the correlation between the resonance conditions (and related dynamic overloads) and both the vibratory behaviour of the rig, as measured through several accelerometers, and the observed scuffing phenomena. Moreover, it was possible to determine the effect of this dynamic behaviour on some indicators and to verify whether the prediction of scuffing predictions could be improved when the actual loads are used.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
