Investigations on electromagnetic scattering characteristics of aircraft rudder considering electromagnetic discontinuities

IF 1 4区工程技术 Q3 ENGINEERING, AEROSPACE Proceedings of the Institution of Mechanical Engineers Part G-Journal of Aerospace Engineering Pub Date : 2023-09-29 DOI:10.1177/09544100231204378

Yi-ran Gu, Shu-sheng Chen, Zheng-hong Gao, Lin Zhou, Jiang-tao Huang

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Abstract

This work investigates the scattering characteristics of the rudder structure of aircraft considering electromagnetic discontinuities through multi level fast multipole algorithm (MLFMA) of the computational electromagnetics. Firstly, the scattering characteristics of the rudder seam and its influence on the omnidirectional radar cross section (RCS) are performed. Based on the traditional high-frequency analysis theory, the source and spatial contribution distribution of seam scattering are further studied. Numerical results demonstrate that the sidewall of the rudder seam is an important scattering source, and the radar absorbing material (RAM) coated on the sidewall of the seam has a good RCS reduction effect. In addition, this work presents the influence of the rudder deflection on the stealth performance, analyzes the effect of the rudder movement of the ordinary aileron and the split drag rudder on the scattering characteristics of the whole aircraft. The common aileron has little effect on the stealth performance of the aircraft, and it only causes scattering peak in the direction opposite to the control surface. However, the split drag rudder has great damage to the opposite direction stealth performance of the aircraft. When its deflection angle is 45°, the mean value of the opposite direction RCS increases by about two orders of magnitude compared with the deflection angle 0° state. The results indicate that the structure of aircraft rudder has a significant impact on the RCS characteristics of the whole aircraft.

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考虑电磁不连续的飞机方向舵电磁散射特性研究

利用计算电磁学的多层次快速多极子算法(MLFMA)研究了考虑电磁不连续的飞机方向舵结构的散射特性。首先，分析了舵缝的散射特性及其对全向雷达截面的影响;在传统高频分析理论的基础上，进一步研究了煤层散射的源和空间贡献分布。数值计算结果表明，舵缝侧壁是重要的散射源，在缝侧壁涂覆雷达吸波材料(RAM)具有良好的RCS抑制效果。此外，本文还研究了方向舵偏转对隐身性能的影响，分析了普通副翼和分阻舵的方向舵运动对整个飞机散射特性的影响。普通副翼对飞机隐身性能影响不大，仅在与控制面相反方向产生散射峰。然而，劈裂阻力舵对飞机的反方向隐身性能有很大的损害。当其偏转角度为45°时，相对于偏转角度为0°的状态，反方向RCS均值增加了约2个数量级。结果表明，飞机方向舵结构对整个飞机的RCS特性有重要影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Mechanical Engineers Part G-Journal of Aerospace Engineering 工程技术-工程：机械

CiteScore

2.40

自引率

18.20%

发文量

212

审稿时长

5.7 months

期刊介绍： The Journal of Aerospace Engineering is dedicated to the publication of high quality research in all branches of applied sciences and technology dealing with aircraft and spacecraft, and their support systems. "Our authorship is truly international and all efforts are made to ensure that each paper is presented in the best possible way and reaches a wide audience. "The Editorial Board is composed of recognized experts representing the technical communities of fifteen countries. The Board Members work in close cooperation with the editors, reviewers, and authors to achieve a consistent standard of well written and presented papers."Professor Rodrigo Martinez-Val, Universidad Politécnica de Madrid, Spain This journal is a member of the Committee on Publication Ethics (COPE).