Accession Number:

AD0728568

Title:

Fourier Analysis of Experimental Finite-Amplitude Standing Waves.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s):

Report Date:

1971-06-01

Pagination or Media Count:

53.0

Abstract:

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

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE