基于磁流变阻尼器的转子系统振动PID控制研究

Study on a single-span rotor system's PID vibration control by magneto-rheological damper

针对大型旋转机械通过临界转速时振动过大的问题,搭建了转子实验台,在不改变转子轴系原有支撑形式的基础上,将磁流变阻尼器作为辅助机构安装在转子上,通过实验研究了阻尼器对转子振动的影响规律。提出了一种PID控制策略,设计了转子振动主动控制系统,以振动幅值为反馈参数,实时调节阻尼器电流,在线抑制转子振动。研究结果表明,该阻尼器可以有效抑制转子临界转速附近的振动,降幅可达90%;通过采用PID控制策略,可根据转子振动变化在线改变控制电流,使转子振动稳定在目标值附近,实现了转子系统开机加速过程振动的自动调控。

Aiming at solving the problem that rotating machinery vibration is too large around the critical speed,a single-span rotor system bench was established to simulate the starting process.Without changing original supports of the rotors system,one self-designed magneto-rheological damper was installed at each shaft.Different working conditions were set to study the influences at different operating current of dampers.According to test results,a PID control strategy was proposed and a vibration active control system was designed.Based on amplitude,vibration of a single-span rotor was controlled with the current which adjusted with different vibration and sent to dampers.The results indicate that the damper can reduce the vibration of the shaft near the critical speed vibrations,and the control method can adjust the vibration in real time,and keep the vibration around the target value,without stopping the machine.