CALIBRATION METHOD FOR TWO-STAGE ACTUATOR CONTROL SYSTEM

Disclosed herein is a calibration method for a two-stage actuator control system. The calibration method includes the steps of inserting a sinusoidal disturbance dv(k) into a control input uv(k) to a main actuator, comparing uv(k) and uv(k)+dv(k) to obtain an open-loop gain, and setting the reciprocal of the open-loop gain in a gain compensator for the main actuator. The calibration method further includes the steps of adding a sinusoidal disturbance dp(k) to an input to a subactuator, and comparing the sinusoidal disturbance dp(k) with an output y(k) from the two-stage actuator to obtain a disturbance input-displacement gain. A design nominal value is divided by the disturbance input-displacement gain to obtain a compensation gain, which is then set in a gain compensator for the subactuator.