Journal ArticleDOI
Mode repulsion of ultrasonic guided waves in rails.
TLDR
Derivatives of SAFE eigenvalues and eigenvectors show the source of mode repulsion and the modes within symmetric or antisymmetric families can be numbered in the same way Lamb waves in plates are numbered, making it easier to communicate results.About:
This article is published in Ultrasonics.The article was published on 2018-03-01. It has received 23 citations till now. The article focuses on the topics: Antisymmetric relation & Lamb waves.read more
Citations
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Journal ArticleDOI
Ultrasonic guided wave monitoring of an operational rail track
TL;DR: An experimental monitoring system that used two piezoelectric transducers mounted under the head of the rail to transmit and receive ultrasonic guided waves in pulse-echo mode indicates that a transverse defect in the rail head could be detected and located at long range by a system comprising only two transducers.
Journal ArticleDOI
Rapid detection of cracks in the rail foot by ultrasonic B-scan imaging using a shear horizontal guided wave electromagnetic acoustic transducer
TL;DR: In this paper, a finite element method (FEM) based on the Bloch-Floquet boundary and domain constraint was employed to calculate the dispersion curves of shear horizontal (SH)-like guided waves propagating in the rail foot.
Journal ArticleDOI
Rail Diagnostics Based on Ultrasonic Guided Waves: An Overview
TL;DR: The use of the ultrasonic guided wave technology in rail track monitoring is investigated in detail and both of the main strategies investigated in the technical literature are taken into consideration.
Journal ArticleDOI
Estimation of rail properties using semi-analytical finite element models and guided wave ultrasound measurements
TL;DR: An automated procedure is proposed to estimate material and geometric properties of a rail by finding the properties which, when input into a Semi-Analytical Finite Element (SAFE) model, accurately reproduce measured dispersion characteristics.
Journal ArticleDOI
A modelling framework for simulation of ultrasonic guided wave-based inspection of welded rail tracks.
TL;DR: The proposed physics-based framework can be used to efficiently perform multiple analyses considering different numbers and locations of welds, different excitation signals or to investigate the effects of changes in parameters such as transducer geometry, or material property variations caused by temperature fluctuations.
References
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Journal ArticleDOI
Rates of change of eigenvalues and eigenvectors.
R. L. Fox,M. P. Kapoor +1 more
TL;DR: Exact expressions for rates of change of eigenvalues and eigenvector to facilitate computerized design of complex structures are presented.
Proceedings ArticleDOI
Modeling wave propagation in damped waveguides of arbitrary cross-section
TL;DR: In this article, a semi-analytical finite element (SAFE) method for modeling wave propagation in waveguides of arbitrary cross-section is proposed, and the dispersive solutions are obtained in terms of phase velocity, group velocity, energy velocity, attenuation and cross-sectional mode shapes.
Journal ArticleDOI
Guided wave dispersion curves for a bar with an arbitrary cross-section, a rod and rail example
TL;DR: Theoretical and experimental issues of acquiring dispersion curves for bars of arbitrary cross-section for guided waves have great potential for being applied to the rapid non-destructive evaluation of large structures such as rails in the railroad industry.
Journal ArticleDOI
Computation of propagative waves in free rail using a finite element technique
TL;DR: In this paper, the dispersion curves of propagative waves in a free rail are computed by using triangular and quadrilateral finite elements of the cross-section of the waveguide.
Journal ArticleDOI
Semi-analytical finite element analysis of elastic waveguides subjected to axial loads.
TL;DR: It was found that the stiffness matrix required to describe the effect of axial load is proportional to the mass matrix, which makes the extension to existing software trivial.