The effects of air temperature and humidity on the acoustic design of voice alarm systems on underground stations |
| |
| Institution: | 1. Division of Orthodontics and Dentofacial Orthopedics, Department of Otolaryngology—Head & Neck Surgery, American University of Beirut Medical Center, Beirut, Lebanon;2. Department of Otolaryngology—Head & Neck Surgery, American University of Beirut Medical Center, Beirut, Lebanon;1. Departamento de Biología Ambiental y Salud Pública, Facultad de Ciencias Experimentales, Universidad de Huelva, Campus de Excelencia Internacional del Mar CEIMAR y CEICAMBIO, 21071 Huelva, Spain;2. Departamento de Física Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, Campus de Excelencia Internacional del Mar CEIMAR y CEICAMBIO, 21071 Huelva, Spain;3. Department of Physics, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;1. Department of Civil, Structural, and Environmental Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA;2. Material Science and Technology Division, Physical Sciences Directorate, Oak Ridge National Lab, Oak Ridge, TN 37831, USA;3. Department of Mechanical and Aerospace Engineering, University at Buffalo, State University of New York, Buffalo, NY 14260, USA;1. Institute of Semiconductor Technology (IHT), Technische Universität Braunschweig, Hans-Sommer-Straße 66, D-38106 Braunschweig, Germany;2. Laboratory for Emerging Nanometrology (LENA), Braunschweig, D-38106, Germany;3. Material Analysis and Indoor Chemistry Department (MAIC), Fraunhofer-Wilhelm-Klauditz-Institut (WKI), Bienroder Weg 54E, D-38108 Braunschweig, Germany;1. Technische Universität Chemnitz, Professur für Technische Physik, D-09107, Chemnitz, Germany;2. Technische Universität Chemnitz, Professur Werkzeugmaschinen und Umformtechnik, D-09107, Chemnitz, Germany |
| |
| 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 frequencies 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. |
| |
| Keywords: | Air absorption Underground station Voice alarm system Climatic condition |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
