Accession Number : ADA020056

Title :   Finite-Amplitude Standing Waves in Real Cavities Containing Degenerate Modes.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Slocum,Winfield scott , IV

Report Date : DEC 1975

Pagination or Media Count : 63

Abstract : Finite-amplitude standing waves in air at ambient temperatures contained within a rigid-walled rectangular cavity having one variable interior dimension were experimentally investigated. The effect of degenerate or nearly degenerate configurations on the harmonic content of the observed pressure waveform was compared to the theory of Coppens and Sanders as modified to include empirically determined losses and resonances. Second and third harmonic distortion for both degenerate and nondegenerate cavity configurations were recorded as continuous functions of frequency in the vicinity of the resonances for the 100 and 110 modes. It was found that in rectangular cavities having walls free of any perturbation, the theoretical model can accurately predict both shapes and amplitudes of the harmonic content of the finite-amplitude standing wave whether or not degeneracies are present. (Author)

Descriptors :   *Cavity resonators, *Acoustic equipment, *Harmonic generators, *Resonators, Standing waves, Air, Room temperature, Rectangular bodies, Frequency response, Microphones, Data acquisition, Theses

Subject Categories : Cybernetics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE