多层平板屏蔽体的多目标优化设计

Multi-objective Optimization Design of the Multilayered Planar Shield

多层屏蔽体的设计是根据屏蔽效能等的要求来确定各屏蔽层的材料以及厚度,由于多层电磁屏蔽的屏蔽效能是入射波的角度、材料的电导率、磁导率、介电常数以及各层的厚度等的强非线性函数,因此,采用数值方法对多层屏蔽体进行设计是非常困难的。为了解决实际应用中的多层屏蔽体设计问题,提出了多目标优化设计模型,在该模型中,将屏蔽体的总质量,总价格以及总厚度作为优化目标,将多个频率的屏蔽效能作为约束条件。利用遗传算法对屏蔽体进行多目标优化设计,最后对一个三层平板屏蔽体进行了实际设计,结果表明该方法切实有效。

The shielding effectiveness of multilayered planar shield is the strong non-linear function of incident angle , conductivity, magnetic permeability, the dielectric constant and the thickness of every layer. Design of the multilayered composite materials is to solve the equations made of these functions. It＇s very difficult to solve the problem by numeric methods. The multi-objective optimization model was presented to solve the problem of the electromagnetic design. The total weight, cost and thickness are the optimization objects and the shielding effectivenesses （SE） in some frequencies are the constrained conditions in the model. And the genetic algorithm was used to design the multilayered composite material by the existent multilayered planar composite electromagnetic shielding material model. By making use of this method, the different shielding materials and the corresponding thickness of every layer can be designed for given shielding effectiveness （SE） in some frequencies, different incident angles. Finally the method was simulated, the results demonstrate the validity of the method.