Artículo
A novel 2.5D spectral approach for studying thin-walled waveguides with fluid-acoustic interaction
Autor/es | Romero Ordóñez, Antonio
Cruz-Muñoz, Francisco Javier Tadeu, Antònio Galvín, Pedro |
Departamento | Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras |
Fecha de publicación | 2018-07 |
Fecha de depósito | 2018-07-26 |
Publicado en |
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Resumen | This paper presents a novel formulation of two spectral elements to study guided waves in coupled problems involving thin-walled structures and fluid-acoustic enclosures. The aim of the proposed work is the development of ... This paper presents a novel formulation of two spectral elements to study guided waves in coupled problems involving thin-walled structures and fluid-acoustic enclosures. The aim of the proposed work is the development of a new efficient computational method to study problems where geometry and properties are invariant in one direction, commonly found in the analysis of guided waves. This assumption allows using a two-and-a-half dimensional (2.5D) spectral formulation in the wavenumber-frequency domain. The novelty of the proposed work is the formulation of spectral plate and fluid elements with an arbitrary order in 2.5D. A plate element based on a Reissner-Mindlin/Kirchhoff-Love mixed formulation is proposed to represent the thin-walled structure. This element uses approximation functions to overcome the difficulties to formulate elements with an arbitrary order from functions. The proposed element uses a substitute transverse shear strain field to avoid shear locking effects. Three benchmark problems are studied to check the convergence and the computational effort for different strategies. Accurate results are found with an appropriate combination of element size and order of the approximation functions allowing at least six nodes per wavelength. The effectiveness of the proposed elements is demonstrated studying the wave propagation in a water duct with a flexible side and an acoustic cavity coupled to a Helmholtz resonator. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España Junta de Andalucía |
Identificador del proyecto | BIA2013-43085-P
BIA2016-75042-C2-1-R |
Cita | Romero Ordóñez, A., Cruz-Muñoz, F.J., Tadeu, A. y Galvín, P. (2018). A novel 2.5D spectral approach for studying thin-walled waveguides with fluid-acoustic interaction. Computers & Structures, 204 (15 July 2018), 1-19. |
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C&S_Galvin_2018_a novel 2.5D.pdf | 6.661Mb | [PDF] | Ver/ | |