Numerical sound field analysis considering atmospheric conditions

Satoshi Ogawa, Yasuhiro Oikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Some systems such as an outdoor public address system and radio acoustic sounding system create loud sounds. The sounds need to be propagated to the desired location for efficient public address. However, sound is greatly affected by atmospheric conditions particularly for long-distance propagation, and it is important to comprehend atmospheric effects. Numerical methods based on geometric acoustics or linear wave acoustics are widely used today for sound field analysis. However, these methods cannot easily consider atmospheric conditions. In addition, we cannot analyze nonlinear sound fields by these methods. In the present paper, we propose a method for analyzing sound fields considering atmospheric conditions and nonlinearity. Equations for numerical sound field analysis, with which we can consider various atmospheric conditions and nonlinearity, are derived from the equations of continuity in fluid dynamics, the Navier-Stokes equations and the law of the conservation of energy. We present numerical calculations of acoustic radiation characteristics and sound fields based on the equations we have obtained, and we use the finite-difference time-domain method to solve them. The effects of atmospheric conditions such as wind, viscosity and nonlinearity can be seen in the results, and thus, the sound generation and sound wave propagation can be comprehended in detail.

Original languageEnglish
Title of host publication42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013
Subtitle of host publicationNoise Control for Quality of Life
PublisherOAL-Osterreichischer Arbeitsring fur Larmbekampfung
Pages3254-3261
Number of pages8
ISBN (Print)9781632662675
Publication statusPublished - 2013 Jan 1
Event42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013 - Innsbruck, Austria
Duration: 2013 Sep 152013 Sep 18

Publication series

Name42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life
Volume4

Conference

Conference42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013
CountryAustria
CityInnsbruck
Period13/9/1513/9/18

Keywords

  • Atmospheric condition
  • Fluid dynamics
  • Nonlinearity
  • Outdoor public address

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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  • Cite this

    Ogawa, S., & Oikawa, Y. (2013). Numerical sound field analysis considering atmospheric conditions. In 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life (pp. 3254-3261). (42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life; Vol. 4). OAL-Osterreichischer Arbeitsring fur Larmbekampfung.