Rafieian - M.Sc. Student, Iran University of Science and Technology, Tehran, Iran.
Ahmadian - Associate Professor, Iran University of Science and Technology, Tehran, Iran.

A gear pair model including local tooth defects and backlash is considered and its response to parametric excitation is evaluated to include the sideband structures due to local tooth defects. Piecewise-linear and hysteresis formulations are considered for impact forces due to backlash. The response with hysteresis energy dissipation is shown to have a clear and stronger appearance of sideband structures. The model resembles the physical merits of the system and can be used for fault detection exercises with more confidence.

gear، backlash، nonlinear، hysteresis، fault detection