National Academies Press: OpenBook

Improving Intelligibility of Airport Terminal Public Address Systems (2017)

Chapter: Appendix E - Examples of Acoustical Material Properties

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Page 148
Suggested Citation:"Appendix E - Examples of Acoustical Material Properties." National Academies of Sciences, Engineering, and Medicine. 2017. Improving Intelligibility of Airport Terminal Public Address Systems. Washington, DC: The National Academies Press. doi: 10.17226/24839.
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Page 148

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148 Examples of Acoustical Material Properties A p p e n d i x e Table E-1. Common sound absorption coefficients per square foot. Material 125 250 500 1000 2000 4000 NRC ½” (12 mm) suspended ACT (4 kg/m2) 0.52 0.45 0.40 0.41 0.49 0.57 0.45 1"-thick high-absorption suspended ACT (.4 lb./square feet) 0.70 0.95 0.75 0.99 1.04 1.01 0.95 50 mm acoustical fiberglass panels 0.59 0.75 0.63 0.60 0.39 0.26 0.60 1" fabric-covered rock wool panel 0.27 0.66 0.109 10.01 0.87 0.65 0.90 Spray-on cementitious material 1" thick 0.18 0.35 0.64 0.73 0.73 0.77 0.60 2"-thick perforated steel deck covering fiberglass insulation 0.10 0.21 0.79 0.98 0.95 0.86 0.75 Large panes of heavy plate glass 0.18 0.06 0.04 0.03 0.02 0.02 0.04 Gypsum board on studs 0.29 0.10 0.05 0.04 0.07 0.09 0.07 Linoleum floor 0.02 0.03 0.03 0.03 0.03 0.02 0.06 Terrazzo or concrete floor 0.01 0.01 0.015 0.02 0.02 0.02 0.016 Wood parquet on concrete floor 0.04 0.04 0.07 0.06 0.06 0.07 0.06 Carpet 35 oz./yd2, 3/32” pile, no pad 0.10 0.16 0.10 0.30 0.50 0.47 0.27 People standing (per square feet/person) 2.0 3.5 4.7 4.5 5.0 4.0 Not app. ACT: acoustical tile Source: Harris (1993) and Beranek (1986)

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TRB's Airport Cooperative Research Program (ACRP) Research Report 175: Improving Intelligibility of Airport Terminal Public Address Systems provides design guidelines to improve public address systems for all types and sizes of airport terminal environments. The guidelines include a summary of data on public address systems, terminal finishes and background noise levels in a variety of airport terminals, identification of acoustical shortcomings, and the results of impacts on existing public address systems. The report provides options for enhancing intelligibility in existing airport terminals as well as ensuring intelligibility in new terminal designs.

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