主动控制动静压混合滑动轴承设计及试验

To control the dynamic characteristics of a rotor-bearing system and improve its stability, an actively controlled hybrid film bearings is designed based on a PD controller. By combining the hybrid bearing with electro-hydraulic servo valves, the bearing gains a specific active compensation ability to cope with changes in the dynamic response of the rotor-bearing system. The experimental setup for an actively controlled hybrid film bearing-rotor system is designed and constructed to validate the vibration control performance of the bearing. Various control parameters are adjusted to investigate the rotor's dynamic characteristics and vibration reduction capabilities. The results demonstrate that with an appropriately chosen differential coefficient, activating active control achieves significant vibration reduction, with the maximum horizontal vibration amplitude of the bearing decreasing from 41.4 μm to 19.6 μm, a reduction of 52.7%. The critical speed of the rotor system can be controlled by adjusting the bearing stiffness with only proportional component activated, reducing the critical speed from 2 508 r/min to 1 980 r/min, a decrease of 21.1%, thereby achieving control over the critical speed of the rotor system.