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Report "Expert analysis of breakage of electric locomotive axle, series JŽ 442-002"

Realization: 2006

This report deals with the analysis of breakage of electric locomotive axle, series JŽ 442-002 explaining that axles of SR electric locomotives broke due to bending. The electric locomotives were produced in Rade Končar Factory, Zagreb under the license of ASEA Co. The negative roles of reducer design, incorporated materials, unsatisfactory ultrasonic testing and poor state of tracks and suspension gear maintenance were determined. Recommendations for problem solving were given.

This phenomenon is caused by operation of diode-type locomotives under high sliding conditions (stick-slip effect). These locomotives shall be thyristorised to ensure better regulation of traction motors. In addition, significant elements of geometry and dynamic track properties (stability, warp and width of the track) shall be maintained according to EN to ensure locomotive running at design speeds.

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