Effect of Misalignment in a Geared-Rotor System Integrated with Active Magnetic Bearings

Gears are key components in any industrial rotary machine, therefore the study of vibration in a geared-rotor system is considered vital. In such a geared system, assembly fault, like misalignment, is very common. Such fault gives external excitation forces on the mating gears. Moreover, the force distribution among the meshing teeth of a gear pair also gets changed due to misalignment. In this work, an experimental study has been made on a geared-rotor setup equipped with active magnetic bearings (AMB). The AMB is used for active vibration control of the geared-rotor system. The control law that has been applied to the AMBs is based on the PID controller. Shaft misalignment faults are deliberately induced in the system to study their effect on the dynamics of the test setup. The experiment is carried out by varying the intensity of misalignment in the input shaft near the pinion. Through the experiments, the dynamic response of the geared system in the frequency domain has been studied and explained.