格栅反射器型面的主动控制

To improve the shape accuracy of the antenna reflector, the mechanical modeling method and the shape control method for a reflector driven by the piezoelectric ceramic transducer (PZT) are studied. An integrated finite element model for the reflector structure and the PZT actuator is established. The influence coefficient matrix method is used to develop an optimization model for active shape control of the reflector with the objective of minimizing the mean square root error of the shape, and the optimal control laws of the actuator are solved by the least square method. An active shape control experimental system of the reflector is built, and the rotating paraboloid is taken as the target shape. Experimental results demonstrate that the shape accuracy of the reflector after active control is improved by nearly 50%, which are in good agreement with simulation results, and verifies the validity of the modeling method and feasibility of the control method.