000015760 001__ 15760
000015760 005__ 20161115135329.0
000015760 04107 $$aeng
000015760 046__ $$k2013-06-12
000015760 100__ $$aDomadiya, P.
000015760 24500 $$aInfinite Periodic Structure of Lightweight Elements: Representation of Wave Propagation

000015760 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015760 260__ $$bNational Technical University of Athens, 2013
000015760 506__ $$arestricted
000015760 520__ $$2eng$$aLightweight wooden structures have become more popular as a sustainable, environmental-friendly and cost-effective alternative to concrete, steel and masonry buildings. However, there are certain drawbacks regarding noise and vibration due to the smaller weight and stiffness of wooden buildings. Furthermore, lightweight building elements are typically periodic structures that behave as filters for sound propagation within certain frequency ranges (stop bands), thus only allowing transmission within the pass bands. Hence, traditional methods based on statistical energy analysis cannot be used for proper dynamic assessment of lightweight buildings. Instead, this paper discusses and compares the use of finite element analysis and a wave approach based on Floquet theory. The present analysis has focus on the effect of periodicity on vibration transmission within semi-infinite beam structures. Two models of a semi-infinite Euler-Bernoulli and Timoshenko beam structure with periodic variation of the cross-sectional properties are analyzed. In case of the Euler-Bernoulli beam, vibrational behavior is studied in two dimensions by finite element analysis and Floquet theory. Wave propagation within the two-dimensional periodic Timoshenko beam structure is studied with a finite-element approach and compared with the periodic Euler-Bernoulli beam. The computations are carried out in frequency domain with the load acting as an impact load at the end of a semi-infinite beam. Results of various beam models and analytical approaches are compared and analyzed. A vibration-level distribution and propagation characteristics within the beam are presented for excitation frequencies up to 2 kHz.

000015760 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015760 653__ $$aLightweight structure, periodicity, Finite element analysis, bending waves, Timoshenko beam, Euler-Bernoulli beam.

000015760 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015760 720__ $$aDomadiya, P.$$iAndersen, L-V.$$iSorokin, S.
000015760 8560_ $$ffischerc@itam.cas.cz
000015760 8564_ $$s465940$$uhttps://invenio.itam.cas.cz/record/15760/files/1411.pdf$$yOriginal version of the author's contribution as presented on CD, section: CD-MS 28 PERIODICITY EFFECTS AND PERIODICITY-BASED METHODS IN VIBRO-ACOUSTICS AND STRUCTURAL DYNAMICS
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000015760 962__ $$r15525
000015760 980__ $$aPAPER