摘要
使用多层结构来离散自由空间到金属衬底之间理想的连续阻抗变化过程是吸波材料设计的重要方法之一,较多层数的精细结构能够更好地逼近这一连续变化过程以获得更理想的吸波性能,但也会增加工程实现成本和复杂度。因此,实际工程中往往需要在结构层数和逼近精度等诸多相互矛盾的因素之间寻求平衡。文中采用石墨烯纳米片(GNS)/片状羰基铁颗粒(FCI)混合填充的多层吸波材料,在由极化无关的宽带宽角吸波性能、FCI填充量以及最终层数这三个指标所张成的三维目标空间中,基于粒子群优化对多层吸波材料进行了优化设计。结果显示,相比于吸波性能和磁性粒子填充量二维空间中的设计结果,在FCI填充量仅需增加不到3.3 wt%的情况下,即可使所需层数下降50%并保持原有吸波能力的98%;不进行优化的GNS填充量仅增加0.6 wt%,且得益于层数的显著减少,吸波材料的总厚度降低了14%,综合性能也提高了27.9%。此外,与其它不同优化策略的系统进行了对比,文中设计为混合填充吸波材料的多目标优化提供了一定参考。
Using multi-layer structure to discrete the continuous impedance changing process from free space to metal substrate is one of the important methods in the design of microwave absorbing materials.More layers can approach more accurate approximation of this continuous impedance changing process and achieve better absorbing properties,but it will lead to an obvious increase of cost and complexity for engineering implementation.Therefore,it is of importance to find a balance between these contradictory factors.In this paper,the multi-layer microwave absorbing material filled with graphene nanosheet(GNS)/flake carbonyl iron particles(FCI)is taken as the main object in this paper.Then,based on particle swarm algorithm,the optimization design is carried out in the three-dimensional objective space composed of polarization-independent broadband and wide-angle microwave absorbing performance,FCI filling amount and the number of layers.The results show that,compared with the design results in the two-dimensional space of microwave absorption performance and magnetic particle filling capacity,the required number of layers can be reduced by 50%and the microwave absorption capacity can be maintained by more than 98%with only a 3.3 wt%increase of the FCI filling amount.Meanwhile,the GNS filling amount,which is not an optimization object,counts a mere 0.6 wt%increase,and thanks to the significant reduction of the number of layers,the total thickness of the microwave absorbing material is reduced by 14%and the comprehensive performance is improved by 27.9%.Finally,the systematic comparison with other different optimization strategies also provides a certain reference for the multi-objective optimization of multi-layer hybrid-filled microwave absorbing materials.
作者
赵雨辰
豆建华
田浩
刘江凡
席晓莉
ZHAO Yu-chen;DOU Jian-hua;TIAN Hao;LIU Jiang-fan;XI Xiao-li(School of Automation and Information Engineering,Xi'an University of Technology,Xi'an 710048,China)
出处
《微波学报》
CSCD
北大核心
2022年第6期95-99,共5页
Journal of Microwaves
基金
国家自然科学基金(61971346)
西安理工大学科研基金(103-451319009,03-451420002)。
关键词
多层混合填充吸波材料
粒子群优化
三目标优化设计
层数
multi-layer hybrid-filled microwave absorbing material
particle swarm optimization
tri-objective optimization design
number of layers
