Guidelines for the Measurement of Interstate Motor Carrier Noise Emissions
Department of Transportation, Federal Highway Administration, Bureau of Motor Carrier Safety - Noise - 98 pages
The objectives of this manual is to provide for a basic understanding of the elements of the measurement of sound, from motor vehicles in particular and the provisions and requirements of the Federal interstate motor carrier noise regulations, so that the reader is prepared to determine compliance with the regulations in a confident manner.
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SOUND MEASUREMENT INSTRUMENTS
TEST SITE SELECTION
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A-weighting acoustic Bureau of Motor carrier noise emission Carrier Safety compliance cavity centerline Coiiective action CompIies with Standaid compliance regulations 49 dB(A decibels device discussed in Chapter enforcement engine exhaust system fan clutch GenRad Ground surface correction highway operations indicated instrument INTERIOR NOISE LEVEL Interstate Commerce Act interstate motor carrier inverse-square law manual measured sound level measurement area ment micro microPascals microphone distance microphone location point microphone target point motor carrier noise Motor Carrier Safety motor vehicle mph 55 km/h Noise Control Act Noise Emission Standards non-standard sites regulations 49 CFR requirements roadway Safety compliance regulations scale shown sound energy sound field sound level measurement sound level meter sound level readings sound measurement sound pressure level sound source sound waves stationary test surement test sites tion tire tolerance tread pattern truck violation visual inspection weighting network wind speed windscreen