International Journal of Ocean System Engineering

  • 제3권1호
  • /
  • Pages.22-32
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  • 2013
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  • 2233-6478(pISSN)
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  • 2233-7059(eISSN)
한국해양공학회 (Korean Society of Ocean Engineers)
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Heuristic Physical Theory of Diffraction for Impedance Polygon

  • Lee, Keunhwa (Dept. of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Park, Sanghyun (Air wing 6, Republic of Korea Navy) ;
  • Kim, Kookhyun (Dept. of Naval Architecture, Tongmyong University) ;
  • Seong, Woojae (Dept. of Naval Architecture and Ocean Engineering, Seoul National University)
  • 투고 : 2012.12.09
  • 심사 : 2013.02.21
  • 발행 : 2013.02.28
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초록

A heuristic physical theory of diffraction (PTD) for an acoustic impedance wedge is proposed. This method is based on Ufimtsev's three-dimensional PTD, which is derived for an acoustic soft or hard wedge. We modify the original PTD according to the process of physical optics (or the Kirchhoff approximation) to obtain a 3D heuristic diffraction model for an impedance wedge. In principle, our result is equivalent to Luebbers' model presented in electromagnetism. Moreover, our approach provides a useful insight into the theoretical basis of the existing heuristic diffraction methods. The derived heuristic PTD is applied to an arbitrary impedance polygon, and a simple PTD formula is derived as a supplement to the physical optics formula.

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참고문헌

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