A 2.5D spectral approach to represent acoustic and elastic waveguides interaction on thin slab structures. (2017)

• Record Type: Journal Article
• Authors: Cruz-Muñoz, FJ.; Romero, A.; Tadeu, A.; Galvín, P.
• Is Part Of: Procedia engineering. Volume 199(2017)
• Page Start: 1374
• Page End: 1379
• Publication Date: 2017
• Subjects: Fluid waveguide -- solid waveguide -- two-and-a-half dimension -- spectral element method -- acoustic -- shear locking; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2017.09.362
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: In this paper, we propose a spectral element method (SEM) to study guided waves in coupled problems involving thin-walled structures and fluid-acoustic cavities. The numerical method is based on the subdomain decomposition of the fluid-structure system. Two spectral elements are developed to represent the fluid and the structure. A plate element based on a mixed Reissner-Mindlin and Kirchhoff-Love formulation is proposed to represent the thin-walled structure. This element uses C0 approximation functions to overcome the difficulties to formulate elements with arbitrary order from C 1 functions. The proposed element uses a substitute transverse shear strain field resulting free shear locking. The fluid element is derived from the Helmholtz equation. These elements use Lagrange polynomials as shape functions at the Legendre-Gauss-Lobatto (LGL) points. The analysis is carried out by a two-and-a-half dimension (2.5D) approach in the wavenumber-frequency domain. The guided wave in a fluid cavity with a flexible side is analysed.