Finite-Element Modeling of a Reverberation Room: Effect of the Room Size and Shape on Measurement Accuracy

Authors

  • Md Mehadi Hasan The University of British Columbia
  • Murray Robert Hodgson The University of British Columbia

Abstract

The reverberation-room method, which assumes a diffuse sound field, has long been used for various standardized room-acoustical measurements – i.e. absorption coefficient, source power level, transmission loss, etc. However, unsatisfactory opinions regarding the accuracy of the method, especially at low frequencies, have been reported over the years. This might be due to a deviation from the assumed diffuse-field concept, which is very challenging to implement from an application point of view. To investigate the problem and find a solution, a number of reverberation rooms of different sizes and shapes have been studied; their capacity to approximate a diffuse sound field is analyzed by means of descriptors like cut-off frequency, spatial uniformity of sound pressures and reverberation times, degree of linearity of temporal decay curves, etc. Results obtained with the help of a numerical finite-element-based modal approach are discussed; in particular, the effect of different room sizes and shapes on the measurement accuracy is explained. Based on these findings, recommendations are proposed regarding the sizes and shapes of reverberation-rooms that will give better field diffuseness and, hence, better measurement accuracy.

Additional Files

Published

2015-08-18

How to Cite

1.
Hasan MM, Hodgson MR. Finite-Element Modeling of a Reverberation Room: Effect of the Room Size and Shape on Measurement Accuracy. Canadian Acoustics [Internet]. 2015 Aug. 18 [cited 2024 Nov. 23];43(3). Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2800

Issue

Vol. 43 No. 3 (2015)

Section

Proceedings of the Acoustics Week in Canada

License

Author Licensing Addendum

This Licensing Addendum ("Addendum") is entered into between the undersigned Author(s) and Canadian Acoustics journal published by the Canadian Acoustical Association (hereinafter referred to as the "Publisher"). The Author(s) and the Publisher agree as follows:

  1. Retained Rights: The Author(s) retain(s) the following rights:

    • The right to reproduce, distribute, and publicly display the Work on the Author's personal website or the website of the Author's institution.
    • The right to use the Work in the Author's teaching activities and presentations.
    • The right to include the Work in a compilation for the Author's personal use, not for sale.

  2. Grant of License: The Author(s) grant(s) to the Publisher a worldwide exclusive license to publish, reproduce, distribute, and display the Work in Canadian Acoustics and any other formats and media deemed appropriate by the Publisher.

  3. Attribution: The Publisher agrees to include proper attribution to the Author(s) in all publications and reproductions of the Work.

  4. No Conflict: This Addendum is intended to be in harmony with, and not in conflict with, the terms and conditions of the original agreement entered into between the Author(s) and the Publisher.

  5. Copyright Clause: Copyright on articles is held by the Author(s). The corresponding Author has the right to grant on behalf of all Authors and does grant on behalf of all Authors, a worldwide exclusive license to the Publisher and its licensees in perpetuity, in all forms, formats, and media (whether known now or created in the future), including but not limited to the rights to publish, reproduce, distribute, display, store, translate, create adaptations, reprints, include within collections, and create summaries, extracts, and/or abstracts of the Contribution.