The effects of air temperature and humidity on the acoustic design of voice alarm systems on underground stations

Journal article

Gomez-Agustina, L., Dance, S. and Shield, B. (2013). The effects of air temperature and humidity on the acoustic design of voice alarm systems on underground stations. Applied Acoustics. 76, pp. 262-273. https://doi.org/10.1016/j.apacoust.2013.08.017
AuthorsGomez-Agustina, L., Dance, S. and Shield, B.
Abstract

Sound attenuation of air due to climatic conditions is often assumed to be constant and/or negligible in the electro acoustic design of voice alarm (VA) systems. However, air attenuation variations can be significant in large underground spaces and particularly as the frequency increases to the mid to high fre-
quencies which are the most relevant to speech intelligibility. This investigation evaluates and quantifies the impact of the variability of the most influential climatic parameters, air temperature and relative humidity, on the performance of VA systems in underground stations. Computer simulations were
employed to predict the effect of varying these climatic parameters on key performance metrics. Results demonstrated a significant increase in the values of reverberation time parameters with both temperature and humidity, at frequencies critical for speech intelligibility. Consequently the values of speech intelligibility related metrics decreased with rising temperatures and humidity. Hence, the study shows
how ignoring temperature and humidity effects can lead to calculation errors in the design of VA systems.
These errors could cause over-specification of the absorption required of surface materials, and the inaccurate prediction of acoustic and speech intelligibility related parameters

KeywordsVoice alarm system, air absorption, underground station, intelligibility
Year2013
JournalApplied Acoustics
Journal citation76, pp. 262-273
PublisherElsevier
ISSN0003-682X
Digital Object Identifier (DOI)https://doi.org/10.1016/j.apacoust.2013.08.017
Web address (URL)http://www.scopus.com/inward/record.url?eid=2-s2.0-84884381277&partnerID=MN8TOARS
Publication dates
Online18 Sep 2013
Publication process dates
Accepted23 Aug 2013
Deposited23 Jun 2022
Accepted author manuscript
License
ISBN0003682X
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