000022380 001__ 22380
000022380 005__ 20170622150011.0
000022380 04107 $$aeng
000022380 046__ $$k2015-05-25
000022380 100__ $$aMencik, Jean-Mathieu
000022380 24500 $$aA 2D WAVE FINITE ELEMENT-BASED SUPERELEMENT FORMULATION FOR ACOUSTIC ANALYSIS OF CAVITIES OF ARBITRARY SHAPES

000022380 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022380 260__ $$bNational Technical University of Athens, 2015
000022380 506__ $$arestricted
000022380 520__ $$2eng$$aA substructuring technique is proposed which enables fast computation of the acoustic response of arbitrary-shaped 2D cavities subject to different kinds of excitations. It combines rectangular superelements which are modeled by means of the wave finite element (WFE) method, and arbitrary-shaped superelements modeled using component mode synthesis (CMS). Within the WFE framework, the so-called receptance matrices of rectangular superelements — which link the pressure vectors to the acoustic force vectors over the boundaries — can be derived in an efficient way in terms of wave modes, without the need of explicitly condensing the internal degrees of freedom of the systems. A model reduction strategy is proposed which aims at expressing the receptance matrices with a few wave modes only. The proposed strategy involves enclosing each rectangular superelement in a finite element (FE) layer with a small width. In this way, smoothed pressure fields are likely to occur over the WFE superelements, hence enabling these superelements to be described with a few wave modes only. By considering those WFE-based rectangular superelements surrounded by FE layers, this yields the so-called hybrid WFE/FE superelements whose dynamic stiffness matrices can be computed in a very fast way. Modeling a whole arbitrary-shaped acoustic cavity follows from conventional assembly procedure between hybrid WFE/FE superelements, CMS superelements and other FE components. Numerical experiments are carried out to highlight the relevance of the proposed substructuring technique.

000022380 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022380 653__ $$aWave Finite Element Method, Acoustic Superelements, Substructuring, Mid-Frequencies.

000022380 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022380 720__ $$aMencik, Jean-Mathieu$$iGobert, Marie-Laure$$iDuhamel, Denis
000022380 8560_ $$ffischerc@itam.cas.cz
000022380 8564_ $$s895000$$uhttps://invenio.itam.cas.cz/record/22380/files/C638.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022380 962__ $$r22030
000022380 980__ $$aPAPER