Accession Number : ADA111820

Title :   Computation of Steady-State Scattered Sound from Submerged Infinite Cylinders by a Structural Analog Method,

Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD

Personal Author(s) : Henderson,Francis M

PDF Url : ADA111820

Report Date : Feb 1982

Pagination or Media Count : 61

Abstract : Finite-element formulations of fluid-structure interaction problems based on the use of structural analogies have been used in a wide variety of applications. The formulations originate from analogies that can be derived between the equations of dynamic elastic motion and generalized forms of the scalar wave equation. The analogies prescribe that the fluid can be modeled with structural finite elements to which special material properties have been assigned. A particular advantage of this approach is the requirement for only a single degree-of-freedom at each field grid point to represent the scalar field variable. In this report the analog formulations are extended to steady-state plane wave scattering by infinite cylinders. Details of implementation of the formulations via the NASTRAN computer program are presented along with calculations of acoustic pressure scattered by submerged rigid cylinders, empty elastic cylinders, and elastic cylinders containing fluids bounded by interior cylinders which may be eccentric with respect to the outer cylinder. Comparison of numerical and analytic results for the rigid and empty elastic cases shows excellent agreement. (Author)

Descriptors :   *Acoustic scattering, Plane waves, Scattering, Cylindrical bodies, Underwater, Steady state, Analogies, Structural properties, Wave equations, Finite element analysis, Equations of motion, Elastic properties, Dynamic response, Sound pressure, Rigidity, Acoustic absorption, Boundaries, Underwater sound, Sound transmission, Mathematical models, Fluids, Structures, Interactions, Formulas(Mathematics), Scalar functions

Subject Categories : Acoustics
      Fluid Mechanics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE