自适应天线结构位移最优控制

为保证大型天线结构的形状精度,传统的方法是使结构具有足够的刚度。当采用自适应结构控制天线形变规律的时候,可以大大降低结构的重量并使结构具有更高的形状精度。针对嵌入压电作动器的自适应抛物面天线结构,建立了以天线反射面最佳吻合抛物面的精度和作动器能耗为综合目标的多目标优化控制模型,模型以结构强度和作动器性态作为约束条件,并用线性加权和法转化为单目标二次规划问题。算例表明,可以用较少的作动器,实现大型天线结构的高精度控制。

OPTIMUM DISPLACEMENT CONTROL OF ADAPTIVE ANTENNAS

For assuring the precision and shape of large-scale antennas, conventional design method is to make the structure stiff enough. When using smart structure to control the deformation of the antenna structure, the weight of the structure can be reduced obviously and the shape precision of the antenna can be improved greatly. A multi-objective optimum control model is constructed for smart parabolic antennas with built-in piezoelectric actuators. In the model, the error of the best-fit paraboloid of antennas and the reference energy consumption are taken as objectives, and the strength of the structure and the characteristic of the actuator are taken as constraints. The model is transformed to a single objective, quadratic programming problem using weighting factors. The simulation of an antenna structure illustrates that a few actuators are needed to realize the high precision control of large-scale antenna.