Accession Number : AD0717585

Title :   Finite Element Study of Acoustic Waves.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Dean,Dennis Vale

Report Date : DEC 1970

Pagination or Media Count : 71

Abstract : The generation and propagation of small amplitude acoustic waves in a homogeneous, loss-free, compressible fluid is studied by the finite element method. A diaphragm mounted in an infinite rigid baffle generates acoustic waves in a semi-infinite fluid region. Steady-state pressure distribution is found for a hemispherical region with boundary reflection suppressed through use of a radiation condition. The computer program developed for the purpose utilizes iso-parametric finite elements with curvilinear boundaries. Incorporated in the program is a versatile mesh generator which minimizes the quantity of input data. Acceptable agreement with analytic results is obtained when there are at least four elements per wave-length. (Author)

Descriptors :   (*UNDERWATER SOUND, SOUND TRANSMISSION), ACOUSTIC IMPEDANCE, MECHANICAL WAVES, COMPUTER PROGRAMS, SONAR SIGNALS, TRANSDUCERS, THESES

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE