6533b7ddfe1ef96bd127529d
RESEARCH PRODUCT
Laser-Generated Acoustic Signal Interaction with Surface Flaws on Rail Wheels
Shant KenderianDonatella CernigliaB. Boro DjordjevicRobert E. Greensubject
DiffractionEngineeringbusiness.industryMechanical EngineeringAcousticsSurface acoustic waveAcoustic waveCondensed Matter PhysicsLine sourceCracks laser ultrasound line source rail wheel shadow zone sound fieldTransducerMechanics of MaterialsGeneral Materials ScienceUltrasonic sensorSurface acoustic wave sensorTreadbusinessdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-10-01 |