BEAM-TRACING PREDICTION OF ROOM-TO-ROOM SOUND TRANSMISSION AND THE ACCURACY OF DIFFUSE-FIELD THEORY

Authors

  • Md Amin Mahmud Graduate Research Assistant
  • Mehadi Hasan PhD Student, Acoustics & Noise Research Group
  • Murray Hodgson <span>Professor of Acoustics, </span><span>Director, Acoustics &amp; Noise Research Group.</span>

Abstract

This paper validates the applicability of the classical diffuse-field prediction formula of room-to-room sound transmission used by many practitioners using energy- and phase-based beam-tracing models. An existing beam-tracing model for empty, parallelepiped rooms with specularly-reflecting surfaces has been adapted to predict room-to-room sound transmission between the source and receiver rooms separated by a common partition. For simplicity, initially sound transmission through the homogeneous common wall is modelled as one locally-reacting homogenous partition with frequency-independent transmission loss. The energy-based beam-tracing model has been validated in both source and receiver rooms through existing results from ODEON in the literature and by comparing the prediction results with CATT-Acoustic room-to-room sound transmission model. The phase-based beam-tracing model has been validated in the source room in comparison with COMSOL predictions. The new models are then used to investigate the accuracy of the classical diffuse-field formula in both source and receiver rooms. The diffuse-field prediction formula is found quite accurate in both the rooms in the beam-tracing prediction for cubic room shape and uniform absorption of all the room surfaces (i.e. for diffuse sound fields); however, it’s accuracy decreases significantly with changes in the shape of the room and the distribution of its surface absorption (i.e. more non-diffuse sound fields).

 

Author Biographies

Md Amin Mahmud, Graduate Research Assistant

Acoustics and Noise Research Group, Department of Mechanical Engineering, UBC Vancouver.

Mehadi Hasan, PhD Student, Acoustics &amp; Noise Research Group

Department of Mechanical Engineering, UBC Vancouver.

Murray Hodgson, <span>Professor of Acoustics, </span><span>Director, Acoustics &amp; Noise Research Group.</span>

Department of SPPH and Mechanical Engineering, UBC Vancouver.

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Published

2017-08-20

How to Cite

1.
Mahmud MA, Hasan M, Hodgson M. BEAM-TRACING PREDICTION OF ROOM-TO-ROOM SOUND TRANSMISSION AND THE ACCURACY OF DIFFUSE-FIELD THEORY. Canadian Acoustics [Internet]. 2017 Aug. 20 [cited 2023 Feb. 7];45(3):66-7. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3078

Issue

Section

Proceedings of the Acoustics Week in Canada

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