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Research Article

Acoustic scattering of an obliquely incident acoustic field by a finite elastic cylindrical shell

비스듬히 입사하는 음장에 대한 유한 길이의 탄성 원통 쉘의 음향 산란

Keunhwa Lee1∗
,
Sung-Hoon Byun2
,
Sea-Moon Kim2
이 근화1∗
,
변 성훈2
,
김 시문2
1세종대학교 국방시스템공학과
2선박해양플랜트연구소
∗Corresponding Author
30 September 2019. pp. 511-521
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Abstract

In this study, we theoretically study the acoustic scattering of an obliquely incident plane wave from a finite elastic cylindrical shell. A heuristic scattering method of Ye [Z. Ye, J. Acoust. Soc. Am. 102, 877-884 (1997)] for a finite fluid cylinder is extended into a finite elastic cylindrical shell since no analytic solutions exist in the finite cylinder. The elastic cylindrical shell is modeled with the 3D elastic wave theory considering internal fluid. Using the derived analytic solution, we observe the effect of the internal fluid on the scattering field, the scattering field for the Rayleigh parameter, and the far-field scattering function for the elastic property of the cylindrical shell.

Keywords
Finite cylinder
Elastic cylindrical shell
Cylinder method
Acoustic scattering

본 연구에서는 무한 유체에 놓여있는 유한 길이의 탄성 원통 쉘에 외부에서 비스듬히 평면파가 입사할 때 발생하는 음향 산란 현상을 이론적으로 연구했다. 유한 길이의 원통 쉘에서는 해석적인 산란 해가 존재하지 않기 때문에, Kirchhoff 가정을 적용한 Ye의 산란 기법[Z. Ye, J. Acoust. Soc. Am. 102, 877-884 (1997)]을 사용했다. 탄성 원통 쉘의 특성은 3차원 탄성파 이론을 적용하여 구현했으며 원통 쉘 내부의 유체를 고려했다. 유도된 해석 해를 이용하여 내부 유체가 산란 음장에 미치는 효과, Rayleigh 변수에 대한 산란 음장, 탄성 재질의 변화에 따른 먼 거리 산란 함수를 살펴보았다.

키워드
유한 원통
탄성 원통 쉘
실린더 법
음향 산란
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 38
  • No :5
  • Pages :511-521
  • Received Date : 2019-01-08
  • Revised Date : 2019-06-24
  • Accepted Date : 2019-07-11
  • DOI :https://doi.org/10.7776/ASK.2019.38.5.511
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