Long- and short-range acoustic-signal interaction with surface-breaking cracks and geometric boundaries of the rail-wheel tread area are presented in this article. Ultrasonic signals are generated using a laser-line source of varying length and distance from a crack and are detected with a 1-MHz contact transducer to map the sound field behind the crack in the near, intermediate, and far fields of the insonified region. The factors that affect the behavior of a laser-generated surface acoustic wave propagating along the tread area of a rail wheel are discussed. A signal normalization method is proposed to help in sensing the presence of a crack from the transmitted signal unaffected by the boundary effect of the complicated wheel geometry, diffraction of the acoustic wave around the crack tip, and source-to-crack length ratio and separation distance.
Laser-generated acoustic signal interaction with surface flaws on rail wheels
Lasererzeugte Ultraschallwechselwirkung mit Oberflächenfehlern an Eisenbahnrädern
Research in Nondestructive Evaluation ; 16 , 4 ; 195-207
2005
13 Seiten, 9 Bilder, 2 Tabellen, 7 Quellen
Article (Journal)
English
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