This disclosure relates to the inspection of train wheels while mounted on a train that is moving on a railroad track. A magnetostrictive EMAT transducer is built using an RF Coil, a static biasing magnetic field, and a strip of highly magnetostrictive material. This magnetostrictive EMAT transducer is subsequently attached to a rail on the track so the wheel tread of the moving train can contact and apply downward pressure on the magnetostrictive EMAT transducer. A mechanism under the transducer provides enough counterforce to pressure-couple the transducer with the tread of the wheel. Once the transducer is ultrasonically coupled with the wheel, an ultrasonic instrument sends a pulse to the transducer generating a Shear Horizontal wave that travels circumferentially following the tread body. The Shear Horizontal wave generated with this magnetostrictive strip EMAT transducer penetrates deep into the wheel tread and permits detection of both surface and internal defects.


    Access

    Download


    Export, share and cite



    Title :

    MAGNETOSTRICTIVE EMAT FOR IN-MOTION INSPECTION OF RAILROAD WHEELS


    Contributors:

    Publication date :

    2024-03-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01D MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE , Anzeigen oder Aufzeichnen in Verbindung mit Messen allgemein / B61K Andere Hilfseinrichtungen für Eisenbahnen , OTHER AUXILIARY EQUIPMENT FOR RAILWAYS / B61L Leiten des Eisenbahnverkehrs , GUIDING RAILWAY TRAFFIC



    EMAT evaluates railroad wheels

    Kristan, J. / Garcia, G. | Tema Archive | 1998


    Flaw Detection of Railroad Wheel Tread Using EMAT

    Kim, Young Gil ;Ahn, Bong Young ;Kim, Young Joo | Trans Tech Publications | 2004


    EMAT inspection of the rail head

    Dixon, S. / British Institute of Non-Destructive Testing | British Library Conference Proceedings | 2003


    EMAT pipe inspection with guided waves

    Salzburger, H.J. / Niese, F. / Dobmann, G. | Tema Archive | 2012