Fuzzy active vibration control of ultra-precision turning machine

Vibration is one of the key factors affecting the machining precision of ultra-precision machine tool. In the paper, a fuzzy active vibration control system combined with air-springs system is presented. The air-springs were used to support the turning machine and isolate the vibration exceeding 2 Hz frequency from foundation. Fuzzy active vibration control system isolate the vibration of lower frequency and control the self-vibration of the turning machine. In consideration of the micro-vibration of the system and the self-vibration of the turning machine, a two dimensional fuzzy controller was designed, in which both velocity and acceleration were used as input variables, and the control voltage of actuator as output variable. As a result of this system's application, the vibration of HCM-I ultra-precision turning machine could be controlled effectively and the machining accuracy improved.