비도체 풍력발전 블레이드에 의한 전자파 산란해석

다국어 초록 (Multilingual Abstract)

Radar Signature reduction of Wind Turbine Blade must be required to avoid a possible detection from military radar sensors.
This paper deals with electromagnetic wave scattering analysis on wind turbine blade using the radar cross section(RCS). RCS prediction is one of the popular and the novel approaches to analyze electromagnetic wave scattering.
RCS is the property of a scattering object, or target, that represents the amount of the echo signal reflected from the object to the radar. The techniques to predict RCS can be categorized into the low frequency and the high frequency methods, according to the size of the target with respect to the operating frequency. High frequency methods such as geometrical optics(GO) and physical optics(PO) can be used to predict the specular component of the scattering mechanism and provide fast and robust solutions to scattering from electrically large and complex target.
In this paper, a numerical scheme based on PO method is developed to predict RCS of non-perfectly conducting body. Using computational results we analyze the effect of wind turbine blade to obstruct radar signal.

목차 (Table of Contents)

• 1 서 론………………………………………………………………….1
• 2 RCS 개요……………………………………………………………………3
• 2.1 RCS 의 정의….……………………………………………………….…3
• 2.2 RCS 예측기법.……………………………………………………….…5
• 2.3 RCS 저주파 해석기법……………………………………………….…6
• 2.4 RCS 고주파 해석기법……………………………………………….…6
• 3 RCS 예측 기법…………………………………..……………………..….8
• 3.1 물리 광학법(Physical Optics)………………………………………… 8
• 3.1.1 Integral Equations………………………………………………… 8
• 3.1.2 Physical Optics Approximations………………………………… 15
• 3.1.3 Phase Integral…………………………………………………… 22
• 3.1.4 RCS Matrix……………………………………………………… 26
• 3.1.5 Effect on the surface property…………………………… 28
• 3.2 물리 광학적 회절 이론(Physical Theory of Diffraction)…………… 31
• 3.2.1 Physical Theory of Diffraction…………………………………… 31
• 3.2.2 Method of Equicalent Currents…………………………………… 34
• 3.2.3 Modifications of PTD…………………………………………… 36
• 3.2.4 Singularity of Diffraction Coefficients…………………………… 38
• 4 RCS 예측 code 검증…………………………………………………..….39
• 4.1 complex Number……………………………………………………… 40
• 4.2 Multilayer……………………………………………………………… 41
• 4.3 Various structure………………………………………………………… 42
• 5 비금속 풍력 터빈 블레이드 RCS 예측……………………………… 48
• 5.1 PEC PTD, Dielectric PTD 영향 분석……………………………… 48
• 5.2 비도체 복합 유전체 재질에 따른 반사계수 영향 분석………… 55
• 5.2 Real Model Wind Turbine Blade 분석……………………………… 58
• 6 결론 및 향후 연구계획…………………………………………………….62
• References………………………………………………………………..………64
• 감사의 글
• 이력서