Research On High Frequency Angular Vibration Turntable Control System

Table servo system is wildly used in every walk of life, the research of turntable has practical significance. There are many parameters to evaluate the performance of table servo system, such as bandwidth, accuracy, speed range. A system with high bandwidth means it can track high frequency signal, the bandwidth of a high frequency turntable can reach 1k Hz or more. However, the high frequency angular vibration turntable tends to cause mechanical resonance, the mechanical resonance seriously influences the enhancement of bandwidth in the servo system. Therefore, the study of suppressing mechanical resonance in the servo system is of great significance.Firstly, a mathematical model is established based on the high frequency angular vibration turntable control system. Motor drive model will be simplified as two-mass model. Then based on this model, this paper has analyzed the phenomenon of mechanical resonance.After that, this paper has studied lots of mechanical control methods, including PI control method, PI combining acceleration feedback method, vibration suppression method based on the torque disturbance observer, mechanical resonance suppression method based on the notch filter. According to the results of simulation, except the PI control method, the rest methods can restrain mechanical resonance. In addition, according to the reason why mechanical resonance occurs, we design a resonance model. We apply sliding mode variable structure control to control this model. Using sliding mode variable structure control do not need o nline identification and has lots of other advantages, therefore, to study sliding mode variable structure control has great practical significance in controlling turntable.At last, this paper introduces the foundation of this turntable. The experimental results show that the proposed strategy is very effective.