Resonance suppression of servo system based on improved notch filter

GONG Wen-quan, ZENG Yue-nan, HUANG Zhi-feng, GUO Fu-qiang
(College of Automation, Guangdong University of Technology, Guangzhou 511400, China)

Abstract: Aiming at the phase lag caused by traditional notch filter of the mechanical resonance suppression of servo system, the principle of mechanical resonance of the servo system and the phase characteristics oftraditional secondorder notch filter were studied, the influence of notch filter on the system was analyzed. In order to decrease the phaselag, an improved notch filter was proposed based on traditional notch filter. The resonance suppression of servo system based on improved notch filter was designed. Through simulation analysis and experiment, the effect of using conventional notch filter and improved notch filter was compared, and the proposed strategy was verified. The simulation results indicate that the improved notch filter get smaller phaselag, and the system bandwidth is expanded compare with the traditional notch filter. The experimental results indicate that the improved notch filter can effectively suppress the resonance of the servo system, at the same time, the response speed and overshoot of the system are improved and speed up the stability speed.
Key words: flexible servo system; mechanical resonance suppression; phase lag; improved notch filter