吸波涂层对直升机旋翼电磁散射特性影响研究  

Research on the Influence of Absorbing Coating on the Electromagnetic Scattering Characteristics of Helicopter Rotors

作　　者：战帅 吕晓林 陈翔宇 马小军 ZHAN Shuai;LYU Xiaoin;CHEN Xiangyu;MA Xiaojun(No.92419 Troops of PLA,Huludao 125001)

机构地区：[1]92419部队,葫芦岛125001

出　　处：《舰船电子工程》2024年第7期190-196,共7页Ship Electronic Engineering

摘　　要：基于几何光学、物理光学和等效电磁流的雷达散射截面(RCS)高频近似算法,联合傅里叶变换提取和分析了涂覆雷达吸波材料旋翼的动态电磁散射特性,重点研究了涂层位置、涂层厚度以及电磁频率等因素变化对旋翼动态电磁散射特性的影响。结果表明:在旋翼表面添加吸波涂层能够有效减缩旋翼的时域动态RCS和频域分量幅值,并且吸波材料的涂覆位置决定了频域上分量幅值降低的频带范围,通过RCS的频谱特征能够判断出旋翼表面何处存在吸波涂层;吸波涂层的厚度和所处的电磁环境,均会影响涂层的吸波效果,根据重量指标、作战任务等需求合理制定旋翼的涂覆吸波材料方案,针对性降低旋翼特定部位的散射强度,能够干扰旋翼时域和频域的动态电磁散射特性,更好地发挥吸波涂层提升旋翼雷达隐身性的能力。Based on geometric optics,physical optics,and equivalent electromagnetic flow,a high-frequency approximation al-gorithm for radar cross section(RCS)is used to extract and analyze the dynamic electromagnetic scattering characteristics of coated radar absorbing material rotors using Fourier transform.The focus is on studying the effects of changes in coating position,coating thickness,and electromagnetic frequency on the dynamic electromagnetic scattering characteristics of rotors.The results show that adding an absorbing coating on the rotor surface can effectively reduce the time-domain dynamic RCS and frequency-domain compo-nent amplitude of the rotor,and the coating position of the absorbing material determines the frequency band range where the compo-nent amplitude decreases in the frequency domain.The spectral characteristics of RCS can be used to determine where the absorbing coating exists on the rotor surface.The thickness of the absorbing coating and the electromagnetic environment it is in can both affect the absorbing effect of the coating.The article reasonably formulates a coating and absorbing material scheme for the rotor based on weight indicators,combat tasks,and other requirements,aiming to reduce the scattering intensity of specific parts of the rotor,which can interfere with the dynamic electromagnetic scattering characteristics of the rotor in both time and frequency domains,and better utilize the ability of absorbing coatings to enhance the stealth of rotor radar.

关 键 词：直升机旋翼 吸波涂层 高频近似算法 雷达散射截面 动态电磁散射 雷达隐身 

分 类 号：V218[航空宇航科学与技术—航空宇航推进理论与工程]