Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
권호 표지
DOI QR코드

DOI QR Code

Infrared Reflector Design using the Phase Field Method for Infrared Stealth Effect

적외선 피탐지를 위한 페이즈 필드법 기반의 적외선 반사층 설계

  • Heo, Namjoon (Graduate school of Mechanical Engineering, Yonsei Univ.) ;
  • Yoo, Jeonghoon (Department of Mechanical Engineering, Yonsei Univ.)
  • 허남준 (연세대학교 대학원 기계공학과) ;
  • 유정훈 (연세대학교 기계공학과)
  • Received : 2014.10.25
  • Accepted : 2014.10.31
  • Published : 2015.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, infrared reflector design targeting infrared stealth effect is presented using structural optimization based on the phase field method. The analysis model was determined to accomplish the design that an incident infrared wave was reflected to a desired direction. The design process was to maximize the objective value at the measuring domain located in a target region and the design objective was set to the Poynting vector value which represents the energy flux. Optimization results were obtained according to the variation of some parameter values related to the phase field method. The model with a maximum objective value was selected as the final optimal model. The optimal model was modified to eliminate the gray scale using the cut-off method and it confirmed improved performance. In addition, to check the desired effect in the middle wave infrared range(MWIR), the analysis was performed by changing the input wavelength. The finite element analysis and optimization process were performed by using the commercial package COMSOL combined with the Matlab programming.

본 연구에서는 페이즈 필드법을 기반으로 하는 위상 최적설계 방법을 통하여 적외선 스텔스 효과를 위한 적외선 반사층의 설계를 진행하였다. 이를 위하여 수직으로 입사하는 적외선 파를 반사층에서 반사되어 원하는 방향으로 전파되도록 모델링을 하였다. 전파 방향에 측정 영역을 설정하여 해당 영역에서의 목적함수 값을 최대화하도록 설계가 진행되었으며, 이때 목적함수는 전자기파의 에너지 흐름을 나타내는 포인팅 벡터(Poynting vector)로 설정하였다. 페이즈 필드법 기반의 방법에서의 여러 파라미터 값들을 변경해 가며 설계 결과를 도출하였고, 목적함수 값을 최대화하는 모델을 최적 모델로 선정하였다. 선정된 최적 모델에서 gray scale을 cut-off 방법으로 제거한 경우 더 좋은 결과를 얻을 수 있었다. 또한 중적외선 영역에서의 효과를 고려하기 위하여 입사되는 파장을 바꿔가며 얻은 해석결과를 검토하였다. 본 연구의 유한요소해석 및 최적화 과정은 상용 프로그램인 COMSOL과 Matlab을 연동하여 수행하였다.

Keywords

References

  1. Ahn, S.-H., Cho, S. (2013) Isogeometric Topological Shape Optimization of Structures using Heaviside Enrichment, J. Comput. Struct. Eng. Inst. Korea, 26(1), pp.79-87. https://doi.org/10.7734/COSEIK.2013.26.1.79
  2. Ball, R.E. (2003) The Fundamentals of Aircraft Combat Survivality Analysis and Design, AIAA Education Series, Blacksburg.
  3. Bendsoe, M.P., Sigmund O. (2003) Topology Optimization: Theory, Methods and Applications, Springer-Verlag, Berlin.
  4. Cahn, J.W., Hilliard, J.E. (1958) Free Energy of a Nonuniform System. I. Interficial Free Energy, J. Chem. Phys., 28(2), pp.258-267. https://doi.org/10.1063/1.1744102
  5. Choi, J.S., Yamada., T., Izui, K., Nishiwaki, S., Yoo, J. (2011) Topology Optimization using a Reaction-diffusion Equation, Comput. Methods Appl. Mech. & Eng., 200, pp.2407-2420. https://doi.org/10.1016/j.cma.2011.04.013
  6. Kang, D.W., Kim, I.-D., Myong, R.-S., Kim, W.-C. (2014) Investigation of Aircraft Plume IR Signature for Various Nozzle Configurations and Atmospheric Conditions, J. Korean Soc. Aeronaut. & Space Sci., 42(1), pp.10-19. https://doi.org/10.5139/JKSAS.2014.42.1.10
  7. Lim, H., Yoo, J. (2014) Topological Nano-Configuration by Structural Optimization based on the Phase Field Method, Struct. & Multidiscip. Optim., 49, pp.209-224. https://doi.org/10.1007/s00158-013-0970-1
  8. Mahulikar, S.P., Sonawane, H.R., Kolhe, P.S. (2007) Infrared Signature Studies of Aerospace Vehicles, Prog. Aerosp. Sci., 43, pp.218-245. https://doi.org/10.1016/j.paerosci.2007.06.002
  9. Park, M.-J., Lee, D.-H., Myong, R.-S., Cho, T.-H. (2008) An Integrated System for Aerodynamic, Structural, and RF Stealth Analysis of Flying Vehicles, J. Korean Soc. Aeronaut. & Space Sci., 36(1), pp.86-91. https://doi.org/10.5139/JKSAS.2008.36.1.086
  10. Takezawa, A., Nishiwaki, S., Kitamura, M. (2010) Shape and Topology Optimization based on the Phase Field Method and Sensitivity Analysis, J. Comput. Phys., 229, pp.2697-2718. https://doi.org/10.1016/j.jcp.2009.12.017
  11. Yamada, T., Izui, K., Nishiwaki, S., Takezawa, A. (2010) A Topology Optimization Method based on the Level Set Method Incorporating a Fictitious Interface Energy, Comput. Methods Appl. Mech. & Eng., 199, pp.2876-2891. https://doi.org/10.1016/j.cma.2010.05.013