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A-weighted A-weighted sound acoustic aircraft noise analysis average background noise Beranek and Newman bond graph cavity CNEL Community Noise compressor damping dB(A decibels device diameter dosimeter drill steel duct effects environment environmental noise exhaust factor Federal Figure floated slab flow coefficient frequency function hearing impact industrial inlet installation Institute of Noise insulation laboratory locations machine measured ment meter microphone muffler Noise Control Act Noise Control Engineering noise emission noise exposure noise levels noise reduction noise regulations noise sources nozzle operating P.O. Box peak pipe punch radiated ratio regulations resonator response rotor scale shown in Fig Silencers sound level sound level meter sound power level sound pressure level specific spectra spectrum standard structure stub Table takeoff tion traffic train noise transmission loss units valve velocity vibration wall