A numerical simulation of the dynamic behaviour of a system is surely a convenient means to perform preliminary testing of a diagnostic system, to support the interpretation of experimental results and to investigate on a wider range of operating conditions and defects. In this work the dynamic behaviour of a faulted gear transmission was simulated. The gear overall stiffness was evaluated statically as function of the gear angular position by means of FE models of the mating wheels and of the supporting structure, taking into account the deformation of the teeth under load, the actual tooth shape modified by wear, and the presence of tooth cracks. The tooth worn profile was previously determined by Archard’s formula on the basis of the kinematic data and contact pressure obtained with a FEM software. The dynamic behavior of the gear was simulated using a simplified lumped parameter model of the system in a Simulink environment, for different applied torques and gear angular velocities. Subsequently, the simulated synchronously averaged acceleration signals produced by the virtual bench were processed by means of Matlab procedures and some standard and non standard diagnostic indicators were calculated in order to determine the most effective parameters for the identification of the defect.

VIBRATION ANALYSIS OF VIRTUAL DAMAGED GEARS

CARMIGNANI, COSTANTINO;FORTE, PAOLA;
2008-01-01

Abstract

A numerical simulation of the dynamic behaviour of a system is surely a convenient means to perform preliminary testing of a diagnostic system, to support the interpretation of experimental results and to investigate on a wider range of operating conditions and defects. In this work the dynamic behaviour of a faulted gear transmission was simulated. The gear overall stiffness was evaluated statically as function of the gear angular position by means of FE models of the mating wheels and of the supporting structure, taking into account the deformation of the teeth under load, the actual tooth shape modified by wear, and the presence of tooth cracks. The tooth worn profile was previously determined by Archard’s formula on the basis of the kinematic data and contact pressure obtained with a FEM software. The dynamic behavior of the gear was simulated using a simplified lumped parameter model of the system in a Simulink environment, for different applied torques and gear angular velocities. Subsequently, the simulated synchronously averaged acceleration signals produced by the virtual bench were processed by means of Matlab procedures and some standard and non standard diagnostic indicators were calculated in order to determine the most effective parameters for the identification of the defect.
2008
9781901892314
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/126569
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