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Simple Estimation of Sound Source Directivity in Diffused Acoustic Field: Numerical Simulation

확산음향장에서의 음원 지향성 간이추정: 수치시뮬레이션

  • Kim, Kookhyun (School of Naval Architecture and Ocean Engineering, Tongmyong University)
  • 김국현 (동명대학교 조선해양공학부)
  • Received : 2019.05.14
  • Accepted : 2019.10.16
  • Published : 2019.10.31

Abstract

The directivity of an underwater sound source should be measured in an acoustically open field such as a calm sea or lake, or an anechoic water tank facility. However, technical difficulties arise when practically implementing this in open fields. Signal processing-based techniques such as a sound intensity method and near-field acoustic holography have been adopted to overcome the problem, but these are inefficient in terms of acquisition and maintenance costs. This study established a simple directivity estimation technique with data acquisition, filtering, and analysis tools. A numerical simulation based on an acoustic radiosity method showed that the technique is practicable for sound source directivity estimation in a diffused reverberant acoustic field like a reverberant water tank.

Keywords

Underwater sound source;Sound source directivity;Simple estimation technique;Diffused acoustic field;Reverberant tank plot