Dynamics of Submarine Structures. Part I.
Final rept. 1 Jun 67-31 May 68,
CATHOLIC UNIV OF AMERICA WASHINGTON D C
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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.
- Submarine Engineering