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Pages 134-140

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From page 134...
... D-1 A P P E N D I X D Current Loudspeaker Practice The basic uncertainty outlined in ISO 1996-2 is for a single source and single receiver measurement. In the study herein, this would be one aircraft flyover or one loudspeaker test.
From page 135...
... D-2 Evaluating Methods for Determining Interior Noise Levels Used in Airport Sound Insulation Programs Current Flyover Measurements For flyover measurements, each aircraft measured represents an independent trial. Especially on takeoff, each aircraft that flies by does so at a different climb profile and with some lateral dispersion.
From page 136...
... Computation of Uncertainty D-3 For the loudspeaker method, the position of the loudspeaker itself becomes a source of additional uncertainty. In particular, if the structure under test has insulated windows (dual glazed)
From page 137...
... D-4 Evaluating Methods for Determining Interior Noise Levels Used in Airport Sound Insulation Programs team will be interested in the number of loudspeaker positions times the number of microphones in ascertaining the uncertainty. For best practice, a minimum of four positions/microphones is suggested.
From page 138...
... Method Field Meas. Margin of Error Calculated Total Margin of Error Outdoor Measurement Factors Interior Measurement Factors Meteor ology Ground Dip MAM resonanceLocaon Ambient Instrument Locaon Ambient Instrument Exisng Pracce Aircra flyover ± 1.9 ± 1.9 1.2 0.5 0.4 0.4 0.5 0.4 1.0 0.5 Speaker outside ± 1.8 ± 1.9 1.3 0.3 0.4 0.4 0.3 0.4 0.5 0.3 1.0 Best Pracce Aircra flyover ± 1.4 0.2 0.5 0.4 0.2 0.5 0.4 1.0 Speaker outside ± 1.1 0.2 0.3 0.4 0.2 0.5 0.4 0.5 0.2 0.5 Intensity ± 0.9 0.4 0.3 0.4 0.4 0.3 0.4 Notes: 1 Flyover method: Assumes only aircra with a 10 dB or higher signal-to-noise ra‚o used.
From page 139...
... Abbreviations and acronyms used without definitions in TRB publications: A4A Airlines for America AAAE American Association of Airport Executives AASHO American Association of State Highway Officials AASHTO American Association of State Highway and Transportation Officials ACI–NA Airports Council International–North America ACRP Airport Cooperative Research Program ADA Americans with Disabilities Act APTA American Public Transportation Association ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials ATA American Trucking Associations CTAA Community Transportation Association of America CTBSSP Commercial Truck and Bus Safety Synthesis Program DHS Department of Homeland Security DOE Department of Energy EPA Environmental Protection Agency FAA Federal Aviation Administration FAST Fixing America's Surface Transportation Act (2015) FHWA Federal Highway Administration FMCSA Federal Motor Carrier Safety Administration FRA Federal Railroad Administration FTA Federal Transit Administration HMCRP Hazardous Materials Cooperative Research Program IEEE Institute of Electrical and Electronics Engineers ISTEA Intermodal Surface Transportation Efficiency Act of 1991 ITE Institute of Transportation Engineers MAP-21 Moving Ahead for Progress in the 21st Century Act (2012)
From page 140...
... TRA N SPO RTATIO N RESEA RCH BO A RD 500 Fifth Street, N W W ashington, D C 20001 A D D RESS SERV ICE REQ U ESTED N O N -PR O FIT O R G .

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