摘要
在有限质量约束下实现宽频隐身性能最优,是隐身飞机吸波涂层应用方案设计所追求的目标。本文针对多种吸波涂层的最优化分区应用问题开展研究,建立了一套吸波涂层应用方案的自动优化方法。首先,基于时域有限差分法计算模型在不同频率、方位、极化下的电磁场,对各状态电磁场做归一化和加权计算后得到总电磁场。然后,将总电磁场按照特定方向、数量进行分区,并将每个分区分别赋予相应的吸波涂层,采用传输矩阵法计算吸波涂层的反射系数以将吸波涂层的影响叠加到电磁场中。对加载吸波涂层后的总电磁场进行近-远场变换,实现模型雷达散射截面(radar cross section,RCS)的快速计算。基于改进的单纯形法和Karush-Kuhn-Tucker条件建立自动优化方法,以降低RCS或减轻吸波涂层质量为目标函数,优化吸波涂层分区方案。最后,以行波板为例,开展包含3种厚度吸波涂层的应用方案减质优化。结果表明,优化方案相比1.5 mm厚吸波涂层方案可实现吸波涂层减重50%,且行波板RCS均值提高不超过1 dB,优化效果显著。
Achieving the best wideband stealth performance under the limited weight constraint is the goal pursued in stealth aircraft radar absorbing coating(RAC)application schemes design.To meet the need for the integrated application of various kinds of RACs on stealth aircraft,an automatic optimization method for the application programme of RAC was established.Firstly,the electromagnetic fields of the model under different frequencies,azimuths and polarizations were simulated based on the finite difference time domain method.The total electromagnetic field was obtained by normalization and weighted calculation of the electromagnetic fields.Then,the total electromagnetic field was divided according to the specific direction and quantity.Each partition was loaded with the corresponding RAC.The reflection coefficient of the RAC was calculated by the transfer matrix method to superimpose the effect of the RAC on the electromagnetic field.The near-far field transformation was performed on the total electromagnetic field after loading with RAC.In this way,fast computation of radar cross section(RCS)was implemented.Based on the improved simplex method and Karush-Kuhn-Tucker condition,an automatic optimization method is established.The objective function was reducing RCS of the target or reducing weight of the absorbing coating.Finally,taking traveling wave plate as an example,the application plan of three thicknesses of RACs was optimized.The goal of optimization was to reduce total weight of the coating.Compared with the 1.5 mm coating plan,the optimization program can reduce the weight by 50%,with the RCS of traveling wave plate increasing by on more than 1 dB.The optimization effect is remarkable.
作者
景致
张澎
张健
JING Zhi;ZHANG Peng;ZHANG Jian(College of Equipment Engineering,Shenyang Ligong University,Shenyang 110158,China;National Key Laboratory of Electromagnetic Information Control and Effects,Shenyang 110035,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2024年第8期219-224,共6页
Journal of Materials Engineering
