Accession Number : ADA325736

Title :   Radiation Efficiencies of a Submerged, Unbaffled Flat Plate: Numerical and Physical Experiments.

Descriptive Note : Master's thesis,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s) : Schott, M. B.

PDF Url : ADA325736

Report Date : MAY 1997

Pagination or Media Count : 78

Abstract : This thesis presents a method for predicting the radiated sound power of structures that combines numerical models of structural finite element and acoustic boundary element analyses. This method involves the generation and validation of a finite element model of an unbaffled, rectangular, flat plate through the use of material properties determined by matching numerical and experimental results and experimentally determined forced response characteristics such as modal frequencies, geometry, damping and generalized force. The finite element model is shown to represent accurately the mode shapes and resonance frequencies of the actual plate. Once a match was achieved between the forced vibration response of the numerical and physical models, the one third octave radiation efficiencies of the finite element model were calculated by means of a lumped acoustic parameter method and compared to experimental measurements conducted in a large water tank. The results of these comparisons show that this approach is capable of predicting the acoustic characteristics of the unbaffled, rectangular plate well.

Descriptors :   *FINITE ELEMENT ANALYSIS, *ACOUSTICS, *RADIATED NOISE, *FLAT PLATE MODELS, VIBRATION, DAMPING, THESES, RESONANT FREQUENCY, SOUND WAVES, GREENS FUNCTIONS, WATER TANKS, DEEP SUBMERGENCE.

Subject Categories : Numerical Mathematics
      Submarine Engineering
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE