Abstract: The turntable having multi-period disturbance torque is obtained by setting up the dynamic unbalance model of three-axis turntable. The multi-period disturbance torque is related to three-axis rotate speed of turntable and influences localization precision, position precision and speed precision of turntable. In order to attenuate system disturbance torque of three-axis turntable, the method of multi-period finite-dimensional repetitive control is proposed and proves to be a success in attenuating the systematic error of turntable caused by multi-period disturbance. The result of simulation shows that multi-period finite-dimensional repetitive control can attenuate dynamic unbalance disturbance of turntable system effectively.

Key words: Dynamic unbalance Multi-period disturbance Finite-dimensional repetitive control, Three-axis turntable