基于磁流变阻尼器的转子系统振动随动控制

针对大型旋转机械通过临界转速时振动过大的问题,搭建了转子系统实验台,实验台保持原本的支撑形式,并安装磁流变阻尼器,实验研究不同工况下磁流变阻尼器对转子系统振动的影响规律.结果表明:磁流变阻尼器可以有效抑制转子系统临界转速附近的振动,降幅可达90%.根据实验结果提出一种以振幅为反馈控制参数的随动控制方法,对转子系统的振幅变化进行追踪,根据振幅实时调节磁流变阻尼器电流,在线抑制振动.结果表明随动控制可以随着转子系统振动变化而在线改变控制电流,使转子系统振动稳定在目标值附近,实现了转子振动的自动调控. 

Rotor system's vibration servo control based on magneto-rheological dampers

In order to solve the problem of too large rotating machinery vibration around the critical speed, a rotor system test bench was established. Without changing the original supports of the rotors system, one magneto-rheological damper was installed onto each shaft. Different working conditions were set to study the influences of the magneto-rheological dampers on rotor system's vibration. The results showed that the magneto-rheological damper could reduce the vibration of the rotor system near the critical speed, and the decreasing amplitude was 90%. According to the test results, a servo control strategy based on vibration amplitude feedback of rotor was proposed to control the rotor vibration amplitude, which could follow the vibration amplitude, change the current of magneto-rheological damper according to the vibration amplitude to control the rotor system's vibration on line. The results show that the servo control method can adjust the current varying with rotor system's vibration in real time, and make the amplitude stay stable around the target value, so as to achieve the auto control of rotor system vibration.