Accession Number : ADA263666

Title :   Low Frequency Acoustics of Laminated Composite Axisymmetric Structures.

Descriptive Note : Technical memo.,

Corporate Author : DEFENCE RESEARCH AGENCY GOSPORT (UNITED KINGDOM)

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

Report Date : FEB 1993

Pagination or Media Count : 32

Abstract : A theory of low frequency sound radiation from and scattering by finite axisymmetric laminated composites is given. The structure is modelled by conical shell finite elements or axisymmetric solid finite elements. The surrounding fluid is modelled by the Helmholtz integral equation. Excitations are a time-harmonic mechanical force at a selected node or a plane wave at arbitrary incidence. Degrees of freedom other than those normal to the structure's exterior surface are removed by receptance coupling methods....Acoustic radiation, Acoustic scattering, Theory, Finite elements, Laminated composites.

Descriptors :   *ACOUSTICS, *LAMINATES, *SHIPS, *FIBER REINFORCED COMPOSITES, ACOUSTIC SCATTERING, AXISYMMETRIC, COUPLINGS, DEGREES OF FREEDOM, EXCITATION, HARMONICS, INTEGRAL EQUATIONS, LOW FREQUENCY, PLANE WAVES, SCATTERING, SOLIDS, SOUND, SURFACES, COMPOSITE STRUCTURES, SPHERES, SHELLS(STRUCTURAL FORMS), EQUATIONS OF MOTION.

Subject Categories : Marine Engineering
      Laminates and Composite Materials
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE