SPECTRAL SUPER-ELEMENTS FOR WAVE-PROPAGATION IN STRUCTURES WITH LOCALNONUNIFORMITIES

Authors
GOPALAKRISHNAN S DOYLE JF
Citation
S. Gopalakrishnan et Jf. Doyle, SPECTRAL SUPER-ELEMENTS FOR WAVE-PROPAGATION IN STRUCTURES WITH LOCALNONUNIFORMITIES, Computer methods in applied mechanics and engineering, 121(1-4), 1995, pp. 77-90
Citations number
38
Categorie Soggetti
Computer Application, Chemistry & Engineering",Mechanics,"Engineering, Mechanical","Computer Science Interdisciplinary Applications
Journal title
Computer methods in applied mechanics and engineering → ACNP
ISSN journal
00457825
Volume
121
Issue
1-4
Year of publication
1995
Pages
77 - 90
Database
ISI
SICI code
0045-7825(1995)121:1-4<77:SSFWIS>2.0.ZU;2-J
Abstract
The spectral element method for the analysis of wave propagation in st ructures is extended by the introduction of a super-element concept to handle local regions of non-uniformity. The region of interest is mes hed with conventional finite elements and its stiffness and mass matri ces dynamically condensed leaving only the connection degrees of freed om. These are further condensed to just waveguide connectivities thus making the element suitable for assembly with other spectral elements. The formulation is verified by comparison with 2-D finite element sol utions. Examples of its use in waveguides with cracks, holes and exten ded joints are demonstrated.