Fourier Analysis of Experimental Finite-Amplitude Standing Waves.
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 f/delta 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1971
- Accession Number
- AD0728568
Entities
People
- James R. Winn
Organizations
- Naval Postgraduate School