Laser vibrometer measurement of guided wave modes in rail track.

Autor: Loveday PW; Sensor Science and Technology, CSIR Material Science and Manufacturing, Box 395, Pretoria 0001, South Africa. Electronic address: ploveday@csir.co.za., Long CS; Sensor Science and Technology, CSIR Material Science and Manufacturing, Box 395, Pretoria 0001, South Africa.
Jazyk: angličtina
Zdroj: Ultrasonics [Ultrasonics] 2015 Mar; Vol. 57, pp. 209-17. Date of Electronic Publication: 2014 Nov 28.
DOI: 10.1016/j.ultras.2014.11.010
Abstrakt: The ability to measure the individual modes of propagation is very beneficial during the development of guided wave ultrasound based rail monitoring systems. Scanning laser vibrometers can measure the displacement at a number of measurement points on the surface of the rail track. A technique for estimating the amplitude of the individual modes of propagation from these measurements is presented and applied to laboratory and field measurements. The method uses modal data from a semi-analytical finite element model of the rail and has been applied at frequencies where more than twenty propagating modes exist. It was possible to measure individual modes of propagation at a distance of 400 m from an ultrasonic transducer excited at 30 kHz on operational rail track and to identify the modes that are capable of propagating large distances.
(Copyright © 2014 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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