Scattering Analysis of Jet Engine Structure using Hybrid Methods하이브리드 방법을 이용한 제트엔진구조의 산란해석

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In this dissertation two kinds of hybrid methods, SBR-FDTD and IPO-FDTD, were studied to estimate the scatterings from an open-ended circular cavity which has either a circular cylindrical protrusion, a cone with 12 blades inside, or circular cylindrical protrusion with 8 straight blades. The three scattering structures have been chosen to study the two hybrid algorithms, grasp uncertain implementation method, and verify the embodied programs. For the case of SBR-FDTD, as the field values at every FDTD cell adjacent to the interface plane ($C_1$) are determined by the SBR and the ray illumination test, the more accurate field distributions at the interface plane has been found. In the study of IPO, two methods, AIPO_RT and AIPO_GR, to determine the iteration number of IPO simulation are proposed and applied to the analysis of scattering from open-ended circular waveguide cavities. In AIPO_RT, the iteration number has been determined from the results of ray path tracings. This method can provide the iteration number proportional to reflections of importance only in case that the ray tracing can be easily implemented. In the AIPO_GR, the quantity of current growth at every facet which constitutes the structure is monitored every iteration and if the value of it falls below the predefined threshold the iteration is forced to terminate. As the method can be applied to any structure, it is safe to say that the method is the more general one to determine the iteration number of IPO simulation. Several simulations showed that the two methods, AIPO_RT and AIPO_GR, can suggest relatively proper iteration number in case that an enough iteration number is unpredictable especially where the number of internal reflections is relatively high such as in deep waveguide cavities. The field distributions at $C_1$ have been calculated by the AIPO method and they are assigned to the excitation field values of FDTD cells adjacent to $C_1$. It is natural that fields at $C_...
Advisors
Myung, Noh-Hoonresearcher명로훈researcher
Description
한국과학기술원 : 전기및전자공학전공,
Publisher
한국과학기술원
Issue Date
2008
Identifier
295425/325007  / 020045275
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학전공, 2008.2, [ v, 96 p. ]

Keywords

scattering; PO; FDTD; RCS; hybrid method; 산란; 물리광학; 유한차분법; 레이다 단면적; 하이브리드 기법; scattering; PO; FDTD; RCS; hybrid method; 산란; 물리광학; 유한차분법; 레이다 단면적; 하이브리드 기법

URI
http://hdl.handle.net/10203/35367
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=295425&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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