超声悬浮轴承系统振幅衰减自抗扰控制

为提高超声悬浮轴承系统轴系转速的稳定性, 设计了自抗扰控制器, 即在保证系统的核心器件压电换能器工作在谐振状态的前提下, 通过对换能器输出振幅的控制, 实现超声悬浮轴承系统稳定运行的控制目标。根据压电换能器的机电等效模型以及实验参数, 利用Matlab 7.0软件仿真环境, 搭建了Simulink仿真系统, 测试了系统的阶跃响应、 抗扰动性能。仿真实验结果表明, 与PID(Proportion Integration Differentiation)控制器相比, 该自抗扰控制器具有较好的响应速度, 而且当工况发生变化时, 能很好地控制振幅的衰减, 抗干扰能力良好。

Active Disturbance Rejection Control for Amplitude Decay of Ultrasonic Levitation Bearing Systems

In order to improve the stability of shaft speed of ultrasonic levitation bearing systems, the ADRC(Active Disturbance Rejection Control) controller is designed insuring the piezoelectric transducer that is the core of thesystem devices to work under the state of resonance, and to make the ultrasonic bearing system to be stable, through the control of amplitude. According to the equivalent model and experimental parameters of piezoelectric transducer, the simulation system of piezoelectric transducer was built, using Matlab 7.0 software simulation environment. The step response of system and the performance of anti-disturbance is simulated. The simulation results show that the proposed ADRC controller with the comparation of the PID(Proportion Integration Differentiation) controller provides good speed of response. With the working conditions changing, it can control the attenuation of amplitude. Moreover, it has good ability of anti-disturbance.