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acoustic data acoustic impedance acoustic lining Adjustable Inlet altitude approximately artificial noise attenuation bandwidth bellmouth Boeing Boeing Company boilerplate calculation procedures centerbody centerline Mach numbers components configuration core cowl wall cruise duct linings Engine rotor speed EPNdB evaluated fabric fan duct fan noise fiberglass flight test flightworthy flow duct flow resistance flyover noise frequency full-scale inlet centerline inlet noise installed laminate landing approach lining depth listening position long duct material maximum measured metallic microphone nacelle modifications noise reduction nozzle operating panels perceived noise level percent performance PNdB polyimide polyimide-fiberglass porous Power Insertion Loss range rayls cgs shown in figure simulated sound pressure level specific fuel consumption spectra splitters static pressure strut takeoff temperature thrust thrust reverser tion total pressure recovery treated airplane treated inlet treated nacelle turbine noise turbofan untreated wrap cowl