Dynamic characteristics of ball bearing-coupling-rotor system with angular misalignment fault

The rotor misalignment fault, which occurs only second to imbalance, easily in the practical rotating machinery system. Rotor can be further divided into coupling and bearing misalignment. However, most of existing references analyze effect on dynamic characteristics system ignore change excitation caused by Based above limitations, a five degrees freedom nonlinear restoring force mathematical model is proposed, considering rings clearance cage pockets. finite element established based Timoshenko beam theory. imbalance are introduced. Finally, ball bearing-coupling-rotor established. radial axial vibration responses under fault analyzed simulation. results show that significantly influences low-speed range, so should not ignored modeling. With increase speed, have greater impact. Misalignment causes periodic changes contact angle, clearance, rotational speed. It also leads reciprocating impact collision between cage. In addition, increases critical speed provide basis for health monitoring diagnosis rolling bearing-rotor