Nonlinear Dynamic Analysis of a Planetary Gear System with Sun Gear Fault

Abstract

Planetary gear systems often work under severe working conditions, causing gear failures to occur frequently. When the gear fails, the dynamic characteristics of the system will be altered with the excitation of nonlinear parameters. To study the dynamic response of the planetary gear system with gear fault, a nonlinear dynamic model for both health system and faulty system containing the backlash, time-varying mesh stiffness and manufacturing error is put forward. Then, the backlash and rotation frequency are taken as the excitation parameters to study the nonlinear characteristics of the faulty and healthy system through the global bifurcation diagram. At the same time, the local characteristics of the two systems are analyzed via the Poincaré maps and phase diagrams. The analysis results show that the faulty system has a more complex movement as the excitation parameters variation. This research can provide a reference for the dynamic design of planetary gear systems.