Computation of leaky guided waves dispersion spectrum using vibroacoustic analyses and the Matrix Pencil Method: a validation study for immersed rectangular waveguides

M Mazzotti; I Bartoli; G Castellazzi; A Marzani

doi:10.1016/j.ultras.2014.05.009

Computation of leaky guided waves dispersion spectrum using vibroacoustic analyses and the Matrix Pencil Method: a validation study for immersed rectangular waveguides

Ultrasonics. 2014 Sep;54(7):1895-8. doi: 10.1016/j.ultras.2014.05.009. Epub 2014 May 21.

Authors

M Mazzotti¹, I Bartoli², G Castellazzi³, A Marzani³

Affiliations

¹ Civil, Architectural & Environmental Engineering (CAEE) Department, Drexel University, 3141 Chestnut St., Philadelphia, PA 19104, USA.
² Civil, Architectural & Environmental Engineering (CAEE) Department, Drexel University, 3141 Chestnut St., Philadelphia, PA 19104, USA. Electronic address: ib77@drexel.edu.
³ Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali (DICAM), Università degli Studi di Bologna, Viale Risorgimento 2, 40136 Bologna, Italy.

PMID: 24890709
DOI: 10.1016/j.ultras.2014.05.009

Abstract

The paper aims at validating a recently proposed Semi Analytical Finite Element (SAFE) formulation coupled with a 2.5D Boundary Element Method (2.5D BEM) for the extraction of dispersion data in immersed waveguides of generic cross-section. To this end, three-dimensional vibroacoustic analyses are carried out on two waveguides of square and rectangular cross-section immersed in water using the commercial Finite Element software Abaqus/Explicit. Real wavenumber and attenuation dispersive data are extracted by means of a modified Matrix Pencil Method. It is demonstrated that the results obtained using the two techniques are in very good agreement.

Keywords: Abaqus; Dispersion; Fluid; Leaky guided waves; Matrix Pencil Method.