Accession Number : ADA182320

Title :   Submerged Structural Response to Weak Shock by Coupled Three-Dimensional Retarded Potential Fluid Analysis - Finite Element Structural Analysis.

Descriptive Note : Final rept. Oct 83-Sep 84,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Tamm,Martin A ; Webbon,Waylon W

PDF Url : ADA182320

Report Date : 21 May 1987

Pagination or Media Count : 36

Abstract : The discretized Kirchhoff retarded potential integral equation for solving the linear acoustic wave equation is coupled to a general finite element structural analysis code to model underwater vibrations. Arbitrary three dimensional problems can be handled, with a present restriction on the allowed orientation of the finite element grid lines and the requirement of a plane wave form. Ramp and Fourier series approximations to a step wave are applied to rigid and elastic spheres to test the numerical formulation, and to test the validity of using a continuous approximation to a discontinuous loading. Keywords: Potential integral, Field analysis, Coupled, Fluid structure interaction, Submerged, Structural response.

Descriptors :   *FINITE ELEMENT ANALYSIS, *STRUCTURAL RESPONSE, *BLAST LOADS, *UNDERWATER STRUCTURES, ELASTIC PROPERTIES, SPHERES, STRUCTURAL ANALYSIS, APPROXIMATION(MATHEMATICS), FOURIER SERIES, MODELS, UNDERWATER, VIBRATION, PLANE WAVES, THREE DIMENSIONAL, GRIDS(COORDINATES), FLUIDS, INTERACTIONS, ACOUSTIC WAVES, LINEAR DIFFERENTIAL EQUATIONS, WAVE EQUATIONS, FORMULATIONS, NUMERICAL ANALYSIS, RAMPS, LOW STRENGTH, SHOCK

Subject Categories : Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE