宽频蜂窝夹层结构吸波复合材料设计方法研究

STUDY ON DESIGN METHOD OF WIDE-BAND WAVE-ABSORBING HONEYCOMB SANDWICH COMPOSITES

建立了具有良好计算准确性的吸波蜂窝及其夹层吸波结构复合材料的电性能计算模型,利用此计算模型,研究了吸波蜂窝和透波蒙皮对蜂窝夹层结构吸波复合材料电性能的影响规律,实现了蜂窝夹层结构吸波复合材料的宽频电性能优化设计。结果表明:蜂窝夹层结构吸波复合材料的吸波性能随着吸波蜂窝介电性能的增加先提高然后降低,当吸波蜂窝介电性能增加到能够最优平衡吸波蜂窝的电磁匹配特性和衰减特性时,吸波性能最优;蜂窝夹层结构吸波复合材料的低频吸波性能(1 GHz^2 GHz频率范围)随着吸波蜂窝芯高度的增加逐渐提高,高频吸波性能(8 GHz^18 GHz频率范围)随着吸波蜂窝芯高度的增加先提高而后逐渐趋于稳定,不再继续随着高度的增加而提高;对于相同透波材料体系,1 mm厚度透波蒙皮可同时满足蜂窝夹层结构吸波复合材料宽频电性能和承载性能要求。通过合理的梯度电结构设计,可实现蜂窝夹层结构吸波复合材料的宽频电性能优化,优化后的蜂窝夹层结构吸波复合材料在1 GHz^18 GHz时具有良好的宽频吸波性能。

In this paper, a simulation calculation model of electrical properties of wave-absorbing honeycomb and honeycomb sandwich structural wave-absorbing composites with good computational accuracy was established. By the simulation calculation model, the effects of wave-absorbing honeycomb and microwave-transparent skin on electrical properties of honeycomb sandwich structural wave-absorbing composites were studied. The wide-band electrical properties of honeycomb sandwich structural wave-absorbing composites were optimized. The results show thatwave-absorbing properties of honeycomb sandwich structural wave-absorbing composites were first improved and then decreased with the increase of the dielectric properties of wave-absorbing honeycomb. While the dielectric properties of wave-absorbing honeycomb increased to the optimum balance of the electromagnetic matching and attenuation characteristics of the wave-absorbing honeycomb, the wave-absorbing properties were optimal. As the honeycomb height increased, the wave-absorbing properties at low frequency(1 GHz^2 GHz) were improved. And, the wave-absorbing properties at high frequency(8 GHz^18 GHz) improved firstly and then tended to be stable and no longer improved continuously. For the same microwave-transparent material, microwave-transparent skin with 1 mm thickness can meet both the requirements of wide-band electrical properties and bearing performance. With the reasonable design of gradient electrical structure, optimizing wide-band electrical properties of honeycomb sandwich structural wave-absorbing composites can be realized. The optimized honeycomb sandwich structural wave-absorbing composite has a high wide-band wave-absorbing property in the frequency range of 1 GHz^18 GHz.