Rotor Vibration Control with Active Bearings Using Predefined-time Control

This study presents an active control method for rotor vibration suppression, combining active bearings with predefined-time control based on a predefined-time extended state observer (PTESO) and a sliding mode controller (SMC). The utilisation of active bearings can be advantageous for high-speed rotating machinery as they can effectively suppress rotor vibration and its associated noise. However, external disturbances and model uncertainties can make it difficult for active bearings with traditional control methods to achieve fast and accurate vibration suppression within strict time constraints. To address these challenges, this study proposes a predefined-time control scheme for active bearing implementation, which can ensure rapid and accurate attenuation of rotor lateral vibrations by imposing a fixed time constraint. The method enables the active bearing control system to address various system uncertainties and disturbances by estimating and compensating for system perturbations in real time. Compared to traditional PID and ADRC (Active Disturbance Rejection Control) methods, the proposed active bearing control approach demonstrates a significant improvement in rotor dynamic responses under tested disturbance scenarios, achieving effective rotor vibration suppression.