000013258 001__ 13258
000013258 005__ 20161114160333.0
000013258 04107 $$aeng
000013258 046__ $$k2009-06-22
000013258 100__ $$aManconi, E.
000013258 24500 $$aWave propagation in axisymmetric structures from finite element analysis

000013258 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013258 260__ $$bNational Technical University of Athens, 2009
000013258 506__ $$arestricted
000013258 520__ $$2eng$$aThis paper describes a wave and finite element (WFE) method for the numerical prediction of wave propagation in axisymmetric structures. A small segment of the structure is modelled using conventional finite element methods, commonly using a commercial package, and the mass and stiffness matrices found. This typically involves a single shell element or, especially for laminate structures, a stack of solid elements meshed through the thickness. Internal fluid can be included straightforwardly. Periodicity conditions are then applied. An eigenvalue problem results, the solutions of which yield the dispersion relations and the wave modes. The circumferential order of the wave can be specified in order to define the phase change a wave experiences as it propagates across the element in the circumferential direction. The resulting eigenproblem then relates the wavenumber and frequency. The WFE method is described and illustrated by application to cylinders in vacuo and filled with fluid and curved panels. These include various isotropic and laminated constructions. Complex dispersion curves and wave modes are presented and discussed. The method is seen to be simple in application and provides accurate results with very little computational cost.

000013258 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013258 653__ $$awaves, dispersion curves, finite elements, cylinders, curved panels, fluid–filled pipes Abstract. This paper describes a wave and finite element (WFE) method for the numerical prediction of wave propagation in axisymmetric structures. A small segment of the structure is modelled using conventional finite element methods, commonly using a commercial package, and the mass and stiffness matrices found. This typically involves a single shell element or, especially for laminate structures, a stack of solid elements meshed through the thickness. Internal fluid can be included straightforwardly. Periodicity conditions are then applied. An eigenvalue problem results, the solutions of which yield the dispersion relations and the wave modes. The circumferential order of the wave can be specified in order to define the phase change a wave experiences as it propagates across the element in the circumferential direction. The resulting eigenproblem then relates the wavenumber and frequency. The WFE method is described and illustrated by application to cylinders in vacuo and filled with fluid and curved panels. These include various isotropic and laminated constructions. Complex dispersion curves and wave modes are presented and discussed. The method is seen to be simple in application and provides accurate results with very little computational cost.

000013258 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013258 720__ $$aManconi, E.$$iMace B., R.
000013258 8560_ $$ffischerc@itam.cas.cz
000013258 8564_ $$s1846683$$uhttps://invenio.itam.cas.cz/record/13258/files/CD385.pdf$$yOriginal version of the author's contribution as presented on CD, section: Acoustic and structural wave transmission in pipelines (MS).
000013258 962__ $$r13074
000013258 980__ $$aPAPER