Accession Number : AD0705061

Title :   COMPUTER SIMULATION OF FINITE-AMPLITUDE STANDING WAVES IN RIGID-WALLED DUCTS.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Kadlick,Richard Mark

Report Date : JUN 1969

Pagination or Media Count : 36

Abstract : The Coppens-Sanders theory for the one-dimensional, nonlinear, acoustic wave equation with dissipative term describing the viscous and thermal energy losses encountered in a rigid-walled, closed tube of large length-to-diameter ratio was applied to finite-amplitude standing waves by the use of the Fast Fourier Transform. Computer programs were written to determine the amplitudes and phases of the first 255 harmonics. Curves of harmonic distortion as a function of the strength parameter were found to be in excellent agreement with available experimental data, to agree with the Coppens-Sanders perturbation analysis, and to extend the theoretically describable regime closer to strengths leading to the formation of the shock front. (Author)

Descriptors :   (*SOUND TRANSMISSION, PIPES), FOURIER ANALYSIS, HARMONIC ANALYSIS, SERIES(MATHEMATICS), ABSORPTION, SIMULATION, NONLINEAR SYSTEMS, COMPUTER PROGRAMS, THESES

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE