飞机舵面缝隙缺陷建模及电磁散射特性分析  

Geometric Modeling and Electromagnetic Scattering Characteristics Analysis of Aircraft Control Surface Slots

作　　者：马若冰 艾俊强 崔力 张扬 MA Ruobing;AI Junqiang;CUI Li;ZHANG Yang(AVIC The First Aircraft Institute,Xi’an 710089,China)

机构地区：[1]航空工业第一飞机设计研究院,西安710089

出　　处：《电讯技术》2022年第3期336-341,共6页Telecommunication Engineering

摘　　要：为了研究飞机舵面缝隙在飞机头向威胁角域的散射特性,提取舵面前端缝隙设计了雷达散射截面(Radar Cross Section,RCS)数值仿真分析模型。采用混合场积分方程和多层快速多极子算法进行了RCS仿真计算,并以RCS峰值、波峰宽度、均值增量三个评价指标分析散射特点。舵面前端缝隙的垂直极化散射明显(不同频率下的均值增量为3.33~10.72 dB),而水平极化散射较弱(均值增量小于1.6 dB),贯通缝隙散射强于沟槽式缝隙。选取了缝隙宽度、长度、频率三个典型参数对通缝垂直极化散射进一步研究,结果表明,峰值随宽度和长度增加而增加;波峰宽度随缝隙宽度增加变化相对平缓,随缝隙长度变化不大,随频率增加而减小;均值增量随宽度增加先增大后平缓,随长度增加先减小后增大,随频率增加先降低后平缓。研究得到的结果可为飞机舵面散射特性分析和RCS减缩设计提供参考。To study the scattering characteristics of aircraft control surface slots in nose threat sector,the front slot of a typical control surface is isolated and an analysis model for radar cross section(RCS)simulation is built.Combined Field Integral Equation(CFIE)and Multilevel Fast Multipole Method(MLFMM)are adopted to calculate its RCS and three evaluation indicators,peak value,peak width and average increment,are used to analyze its scattering characteristics.Scattering of the front slot is distinct in vertical polarization(VV)with an average increment ranged from 3.33 dB to 10.72 dB at different frequencies,while its scattering in horizontal polarization(HH)is weak with an average increment less than 1.6 dB.The scattering of cut-through slot is stronger than that of trench-type gap.Three typical parameters,length,width of slot and frequency,are chosen to further investigate the scattering behavior of cut-through slots in vertical polarization(VV).Results show that RCS peak value raises with the increase of slot width and length.Peak width changes relatively gently with the increase of slot width,slightly changes with slot length and decreases when frequency rises.Average increment increases at first and then flattens with slot width ascends,decreases at first and then increases with slot length ascends,decreases at first and then flattens with frequency rises.The conclusions can provide references for scattering behavior analysis and RCS reduction design for airplane control surface.

关 键 词：飞机舵面缝隙 雷达散射截面(RCS) 电磁散射特性 多层快速多极子算法(MLFMM) 

分 类 号：V218[航空宇航科学与技术—航空宇航推进理论与工程]