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Characteristics and prediction of sound level in extra-large spaces

Wang, C; Ma, H; Wu, Y; Kang, J; (2018) Characteristics and prediction of sound level in extra-large spaces. Applied Acoustics , 134 pp. 1-7. 10.1016/j.apacoust.2017.12.023. Green open access

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Abstract

This paper aims to examine sound fields in extra-large spaces, which are defined in this paper as spaces used by people, with a volume approximately larger than 125,000m3 and absorption coefficient less than 0.7. In such spaces inhomogeneous reverberant energy caused by uneven early reflections with increasing volume has a significant effect on sound fields. Measurements were conducted in four spaces to examine the attenuation of the total and reverberant energy with increasing source-receiver distance, which was then validated by the simulations with image-source method. Results show that the reasons for the total energy’s exponential decrease are not only the direct sound, but also the reverberant energy. The prediction difference of total sound pressure level (SPL) between classical formula and the image-source method increases with the volume and decreases with the surface absorption, based on which a critical line separating extra-large spaces from large ones is proposed. Moreover, a newly modified model based on the importance of first reflection from floor is proposed, showing more advantages of sound level prediction in extra-large spaces.

Type: Article
Title: Characteristics and prediction of sound level in extra-large spaces
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.apacoust.2017.12.023
Publisher version: https://doi.org/10.1016/j.apacoust.2017.12.023
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Acoustics, Extra-large space, Sound field, Sound pressure level, Prediction, DIFFUSELY REFLECTING BOUNDARIES, REVERBERATION TIME, ENERGY RELATIONS, CHURCHES, ENCLOSURES, FIELD, ROOMS, PROPAGATION, ACOUSTICS, LONDON
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/10047693
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