Electromagnetic scattering characteristics of coaxial helicopter based on dynamic transformation method  

作　　者：Zeyang ZHOU Jun HUANG Jinjun WANG 

机构地区：[1]School of Aeronautic Science and Engineering,Beihcmg University,Beijing 100083,China

出　　处：《Chinese Journal of Aeronautics》2021年第2期516-528,共13页中国航空学报（英文版）

基　　金：supported by the project funded by China Postdoctoral Science Foundation;the Excellence Foundation of Beihang University for Ph D;the National Natural Science Foundation of China (No. 91641123)。

摘　　要：With the development of coaxial rotors and high-speed helicopters, the electromagnetic scattering characteristics of coaxial helicopters have gradually become a research hotspot. In order to deal with the Radar Cross-Section(RCS) of high-speed rotating rotors or coaxial main rotors, a Dynamic Scattering Method(DSM) based on dynamic process simulation and grid coordinate transformation is presented. Instantaneous electromagnetic scattering from rotors and helicopters is solved using Physical Optics(PO) and Physical Theory of Diffraction(PTD). Important factors are analyzed and discussed in detail, including individual rotor rotation, azimuth, elevation angle,fuselage, pitch angle, and roll angle. The results show that the electromagnetic scattering characteristics of rotor-type components are dynamic and periodic. The dynamic RCS period of a single rotor is related to the dynamic RCS period of the coaxial main rotor. Choosing different observation angles and attitude angles has a great impact on the static and dynamic RCS of the helicopter.The presented DSM is effective and efficient to analyze and determine the dynamic electromagnetic scattering characteristics of conventional helicopters or coaxial helicopters.

关 键 词：Coaxial helicopter Dynamic electromagnetic scattering Radar cross section Radar stealth ROTOR 

分 类 号：V275.1[航空宇航科学与技术—飞行器设计]