Accession Number : AD0820949

Title :   PROPAGATION OF TWO SIMPLE ACOUSTIC TRANSIENTS IN AN ISOVELOCITY LAYER WITH PERFECTLY-REFLECTING BOUNDARIES.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Miller, Alan Charles

Report Date : JUN 1967

Pagination or Media Count : 120

Abstract : The propagation of simple acoustic transients in an isovelocity water layer was investigated for the purpose of studying a relationship between the propagation of transients in ducts and in layers. The Laplace transform method was used to obtain approximate solutions for the acoustic pressure, particle velocity, and particle displacement resulting from a step-function input in velocity and the particle velocity resulting from a gated sine-wave input in velocity. Computer programs were written to evaluate and graph the resulting waveforms. The waveforms resulting from step-function and gated sine-wave inputs in velocity were observed and compared with the predicted waveforms. With the use of Mylar transducers, good correlation was obtained in the region of validity of the theoretical solutions. It was found that previously published solutions for the propagation of transients in ducts became the leading terms of the associated solutions for the layer. (Author)

Descriptors :   *ULTRASONIC RADIATION), (*SOUND TRANSMISSION, DUCTS), (*UNDERWATER SOUND, THESES, TRANSFORMATIONS(MATHEMATICS), PRESSURE, VELOCITY, TRANSDUCERS, WAVEGUIDES, ACOUSTIC PROPERTIES, COMPUTER PROGRAMS, BESSEL FUNCTIONS, WAVEGUIDES, PROPAGATION.

Subject Categories : Acoustics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE