Scattering of plane guided waves obliquely incident on a straight feature with uniform cross-section.
J Acoust Soc Am
; 128(5): 2715-25, 2010 Nov.
Article
en En
| MEDLINE
| ID: mdl-21110567
A frequency-domain finite element (FE) method is presented for modeling the scattering of plane guided waves incident on an infinitely-long, straight feature with uniform cross-section in a planar host waveguide. The method utilizes a mesh of 2-dimensional finite elements with harmonic shape functions in the perpendicular direction. The model domain comprises a cross-section through the feature and short lengths of the adjoining host waveguide. A spatial frequency equal to the wavenumber of the desired incident mode multiplied by the sine of the desired incidence angle is prescribed for the element shape functions. An integral representation of the incident mode is used to determine a suitable system of harmonic forces to uniquely excite that mode. These are applied at nodes through the thickness of the host waveguide on one side of the feature. The displacement field is measured at nodes through the thickness of the host waveguide on either side of the feature and decomposed into reflected and transmitted modes. The cases of guided wave transmission in a featureless waveguide and the reflection of guided waves from a free-edge are examined as validation cases. Finally, the results for transmission at an adhesively-bonded stiffener are presented and compared with experimental measurements.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ultrasonido
/
Análisis de Elementos Finitos
/
Modelos Teóricos
Idioma:
En
Revista:
J Acoust Soc Am
Año:
2010
Tipo del documento:
Article
País de afiliación:
Reino Unido
Pais de publicación:
Estados Unidos