Accession Number : AD0689203

Title :   Dynamics of Submarine Structures. Part I.

Descriptive Note : Final rept. 1 Jun 67-31 May 68,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON D C

Personal Author(s) : Baltrukonis,J. H.

Report Date : MAR 1969

Pagination or Media Count : 97

Abstract : A study has been conducted concerning the difficulties associated with the development of a digital computer program for the calculation of the response of highly-complex, submarine (or submerged) structures to arbitrary dynamic excitation. The complicating aspect of this problem is the solution of the equations of motion. In reality, two problems must be solved simultaneously: (1) structural vibrations, and (2) radiation of mechanical energy into the surrounding fluid. The present study was concerned almost solely with the former problem. Three methods are explored: mode superposition, Fourier transform and time marching. In each case the equations of motion are formulated by means of the finite element method. Each method is discussed in some detail. A computer program is presented for the computation of the natural frequencies of free, longitudinal vibrations of long, thin, prismatical rods.

Descriptors :   (*SUBMARINE HULLS, STRUCTURAL PROPERTIES), (*SHELLS(STRUCTURAL FORMS), NUMERICAL ANALYSIS), COMPUTER PROGRAMS, RESONANT FREQUENCY, VIBRATION, LOADS(FORCES), EQUATIONS OF MOTION, DEFORMATION, MATRICES(MATHEMATICS), RODS, FOURIER ANALYSIS

Subject Categories : Submarine Engineering
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE