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Dynamic Response of Two-Stage Gear System Damaged by Teeth Defects

Walha L., Louati J., Fakhfakh T., Haddar M.

Machine Dynamics Problems

2005

Vol. 29, No. 3

107--124

In this paper, a linear time varying plane model of two stage spur gear system is formed to investigate the dynamic response for general spur gear location in the gearbox. The excitation is induced by two gear meshes stiffness fluctuations. This case describes the real working of the gearings. The calculation of the dynamic response is done by a step-by-step time integration method (Newmark method). One case of gears location is treated. Severe working conditions can lead to the system failure. Tooth crack and teeth scaling are one of these damages. They can occur on the first gear mesh contact and/or on the second one. In this paper they are discussed and modelled in the case of a two-stage gear system. The dynamic behavior of the healthy gear system and the defected one are compared both in the time domain and in the frequency domain. Wigner-Ville distribution method is used to show the dynamic behavior in the joint time-frequency domain and to localize the defected teeth.