• Title/Summary/Keyword: 강체 산란체

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Augmentation of Field Measurements Using a Rigid Scatterer in the BEM-based NAH (역경계요소법에 기초한 음향홀로그래피에서 강체산란체를 이용한 음장 측정 개수 증가)

  • Kim Sung-Il;Jeong Ji-Hoon;Ih Jeong-Guon
    • Proceedings of the Acoustical Society of Korea Conference
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    • autumn
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    • pp.305-308
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    • 2004
  • 경계요소법을 이용한 음향홀로그래피 구현에 요구되는 많은 측정 노력을 줄이기 위하여 강체 산란체를 이용한 홀로그래피의 기본이론을 제시하였다. 강체산란체를 음장에 위치시켰을 때의 기본이론을 제시하고, 피스톤의 자유공간방사경우에 산란체의 거리의 변화에 따른 음향진동전달함수의 특이성 변화를 관찰하였다.

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Use of Rigid Scattering Body in the use of NAH based on the inverse BEM (역경계요소법에 근거한 근접 음향 홀로그래피에서 강체 산란체의 이용)

  • 김성일;정지훈;이정권
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.486-489
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    • 2004
  • The NAH based on the inverse BEM is used to reconstruct the source field, which is advantageous in dealing with the irregular source. In the implementation of this technique, a large number of pressure measurements is required because an over-determined pressure data set is required. These conditions accordingly cause the increase of measurement time and associated effort along with the error due to mal-positioning. The purpose of this study is to reduce such inconveniences: Instead of increasing the number of field pressure data, the number of transfer paths between the source and the receiver is increased by placing rigid scattering body in-between the source and receiver. For validating the usefulness and effectiveness of the method, the numerical analyses of interior problem are demonstrated. As a result, it is thought that the proposed method enables the measurement at smaller number of sensor positions and the monitoring of surface vibration with less experimental effects than before.

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The Scattering Analysis for the Sphere in Water (수중에서 구형 산란체에 의한 음의 산란 해석)

  • 김관주;김재환;유상욱
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1998.04a
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    • pp.622-628
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    • 1998
  • The SONAR(SOund NAvigation and Ranging) is the system that detects objects and finds their locations in water by using the echo ranging technique. In this paper, the scattering phenomena for a rigid spherical scatterer will be analyzed using closed form solution, Boundary Element Method and Finite Element Method. Scattering analysis for an elastic spherical scatterer will be analyzed, later. In oder to analyzing the sound wave scattering phenomena for an elastic scatterer in water coupled problem between acoustic and vibration must be considered.

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