Motion period characteristics of sun gear fault meshing behaviours

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (6) : 263-270.

ZHANG Mian, WANG Kesheng, LI Yaxin

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Abstract

The fault diagnosis of planetary gearboxes is a challenging issue due to the complexity and variety of vibration responses generated by the relative motions of internal gears which are much different from the case of fixed-shaft gearboxes.When the damage occurs on a tooth, due to the time-varying transfer paths caused by the dynamic fault meshing behaviors, the captured fault induced information on a fixed-sensor may exhibit unique irregularity.Before properly making use of these fault induced information for fault diagnosis, the period of fault meshing behaviors should be focused and analyzed, because a certain period included in the analyzed data may involve complete fault information for fault detection.In the paper, a method was introduced to determine the period of sun gear fault-meshing positions based on the kinematics of the internal gears.Two conditions were considered: planet gears were all different; planet gears were identical.Generalized mathematical expressions for the number of rotations of the sun gear and the carrier under above two conditions were derived respectively.The proposed expressions can also be applied to ring gear fixed planetary gearboxes.Finally, experimental studies were carried out to suggest the minimal measured data length to ensure an effective fault diagnosis.

Key words

fault diagnosis / motion period of fault meshing position / transmission path / vibration response of fault induced vibration / minimal length of measured data

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ZHANG Mian, WANG Kesheng, LI Yaxin. Motion period characteristics of sun gear fault meshing behaviours[J]. Journal of Vibration and Shock, 2020, 39(6): 263-270

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