Fourier Analysis of Experimental Finite-Amplitude Standing Waves.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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Finite-amplitude standing waves in air at ambient conditions contained in a rigid-walled cylindrical tube with a large length-to-diameter ratio were experimentally investigated. The pressure waveform at the end of the tube was digitized and Fourier analyzed on an IBM 360 digital computer. Amplitudes and phases were obtained for all harmonics with amplitudes greater than 1 of the fundamental for strength parameters from 0.25 to 1.00 and for frequency parameters from -0.8 to 2.0 The strength and frequency parameters are defined as MbQ and 2 delta fdelta f respectively, where M is the Mach number of fundamental, b the nonliniarity parameter, Q the quality factor of the resonator, delta f the frequency away from fundamental resonance, and delta f the band width at the half-power points. These results are compared to the theoretical model of Coppens and Sanders. Author