000013161 001__ 13161
000013161 005__ 20161114160330.0
000013161 04107 $$aeng
000013161 046__ $$k2009-06-22
000013161 100__ $$aBuchschmid, M.
000013161 24500 $$aItm-based fsi-models for applications in room acoustics

000013161 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013161 260__ $$bNational Technical University of Athens, 2009
000013161 506__ $$arestricted
000013161 520__ $$2eng$$aIn this paper a method is presented for modeling sound fields in acoustic volumes with vibrating delimiting surfaces. The model is based on a Component Mode Synthesis, where the fluid-component is considered by its normal modes and constraint modes at the interface, which could result from e.g. Finiteor Spectral Element calculations. Compound absorbers consisting of homogeneous plates and porous layers are coupled with the fluid as boundary conditions. Their differential equations are solved in the wavenumber-frequency-domain after applying a Fourier Transform. Wavenumberand frequency- dependent impedances are computed for these infinite structures and used for the coupling. Finally Hamilton´s Principle is formulated for the coupled system and the steady state response is calculated for a harmonically oscillating pressure load. The application of this method is presented for a simple 2D model of a rectangular room with a compound absorber, consisting of a porous foam between two layers of homogeneous material, applied as an impedance boundary condition at one surface.

000013161 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013161 653__ $$aRoom Acoustics, FSI, Integral Transform Methods, Compound Absorber, Porous Media. Abstract. In this paper a method is presented for modeling sound fields in acoustic volumes with vibrating delimiting surfaces. The model is based on a Component Mode Synthesis, where the fluid-component is considered by its normal modes and constraint modes at the interface, which could result from e.g. Finiteor Spectral Element calculations. Compound absorbers consisting of homogeneous plates and porous layers are coupled with the fluid as boundary conditions. Their differential equations are solved in the wavenumber-frequency-domain after applying a Fourier Transform. Wavenumberand frequency- dependent impedances are computed for these infinite structures and used for the coupling. Finally Hamilton´s Principle is formulated for the coupled system and the steady state response is calculated for a harmonically oscillating pressure load. The application of this method is presented for a simple 2D model of a rectangular room with a compound absorber, consisting of a porous foam between two layers of homogeneous material, applied as an impedance boundary condition at one surface.

000013161 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013161 720__ $$aBuchschmid, M.$$iPospiech, M.$$iMuller, G.
000013161 8560_ $$ffischerc@itam.cas.cz
000013161 8564_ $$s2182020$$uhttps://invenio.itam.cas.cz/record/13161/files/CD214.pdf$$yOriginal version of the author's contribution as presented on CD, section: Fluid-structure-soil interaction.
000013161 962__ $$r13074
000013161 980__ $$aPAPER