Fault Signal Simulation and Service Condition Monitoring of Cracked Gear System

A simulation approach was proposed in this work for monitoring fault status of cracked gear systems. The approach calculates the dynamic response signals from a dynamic model of the cracked gear system. First, time-varying meshing stiffness (TVMS) of the cracked gear pair (CGP) was computed by slicing method considered the coupling effect. Second, a novel 12 DOF dynamic model was constructed by using TVMS and tooth nonequilibrium moment. Subsequently, fault features of the cracked gears were extracted by the investigation of the dynamic response. The results demonstrate the proposed method (PM) effectively monitors cracked gear system condition, and the condition indicators were sensitive to the cracked status and system resonance.