A Study on the Characteristics of Phased Beam Tracing Method for the Acoustic Simulation of an Enclosure at Mid Frequencies

Cheol-Ho Jeong, Jens Holger Rindel

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

High frequency acoustic analysis of an enclosure has been dealt with by geometrical acoustic techniques and low frequency response can be estimated by modal methods; however, mid frequency range has been a grey zone. The phased beam tracing method (PBTM) is one of the mid-frequency techniques, which can calculate a pressure impulse response rather than energy reflectogram, although main assumptions in geometric acoustics still hold. The phased method utilizes the reflection coefficient representing the acoustic property of a surface and the complex wave number to describe the propagation characteristics. In this study, a room was chosen as a demonstration example and the proposed method was applied to this room; the result was compared with measurements. Diffraction and scattering effects were assumed to be negligible and only the geometrical law of reflection was considered. It was found that the phased method is advantageous compared to the conventional ray/beam tracing method: accurate prediction of early part of impulse response, better agreement with measured data, lower and extendable frequency range. This means that the technique can be employed in calculating the sound quality metrics and the auralization of rooms. If the demerit of disregarding diffraction and scattering effects is improved, this method can be a mid-frequency bridge to connect the modal method and geometrical acoustic method for the acoustic simulation of an enclosure in a unified approach.
Original languageEnglish
Title of host publicationProceedings of the WESPAC IX 2006, The 9th Western Pacific Acoustics Conference : Better life through acoustics
Number of pages7
Publication date2006
Publication statusPublished - 2006
Event9th Western Pacific Acoustics Conference - Seoul, Korea, Democratic People's Republic of
Duration: 26 Jun 200628 Jun 2006
Conference number: 9

Conference

Conference9th Western Pacific Acoustics Conference
Number9
Country/TerritoryKorea, Democratic People's Republic of
CitySeoul
Period26/06/200628/06/2006

Keywords

  • Beam tracing method
  • Room acoustics
  • Simulation
  • Mid frequency
  • Phase

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