基于自抗扰控制的超低频主动隔振系统设计

Design of ultra low frequency active vibration isolation system based on active disturbance rejection control

对于0.1~10 Hz频率谱段的超低频振动,一般需要采用主动隔振来保护精密仪器的测量与使用。主动隔振是将干扰源先通过振动传感器将信号转化为电信号,再通过放大器将电信号传给自抗扰控制器,控制器将信号传输到作动器产生一个与干扰源相反的力,将振动抵消而达到隔振目的。文章阐述的主动隔振采用了自抗扰控制技术,自抗扰控制技术的优点为原理简单、入门简易、适应力强、基于误差消除误差等。其技术对于传统PID来说又有改进之处,如抗干扰能力强,在同种条件下同比传统PID调节参数更加简单和实用,能满足精密仪器的主动隔振需要。

For ultra-low frequency vibration in 0.1-10 Hz frequency spectrum,active vibration isolation is usually needed to protect the measurement and use of precision instruments.Active vibration isolation means that the interference source first converts the signal into electrical signal through the vibration sensor,and then transmits the electrical signal to the active disturbance rejection controller through the amplifier.The controller transmits the signal to the actuator to generate a force opposite to the interference source,which cancels the vibration to achieve the purpose of vibration isolation.In this paper,the active vibration isolation adopts the active disturbance rejection control technology.The advantages of the active disturbance rejection control technology have simple principle,simple entry,strong adaptability and error elimination based on error.Its technology is improved compared with traditional PID such as strong anti-interference ability,simpler and more practical than traditional PID adjustment parameters under the same conditions,so it can meet the need of active vibration isolation of precision instruments.