Due to excessive service load, inappropriate operating conditions or simply end of life fatigue, damage can occur in gears. When a fault, either distributed or localised, is incurred by gears, the stiffness and consequently vibration characteristics of the damaged tooth will change. In this work an analytical formulation of the time varying geannesh stiffness was derived. Two local tooth faults are modelled: tooth pitting and crack. Their influence on the gearmesh stiffness is analysed. A planetary gear set is presented as a case study to implement the tooth fault modelling. The response shows amplitude modulation resulting in high activity of sidebands.
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