Abstract
Damage to the running surfaces of wheels on railways poses a threat to road safety. They can lead to accidents and disasters. Wheels with a flat spot are the biggest threat. The paper reviews problems that arise when wheels with a flat spot come into contact with a rail, and the methods of their detection and diagnosis. However, the known methods for their determination are still very complex and not precise enough. The research presented is based on previous theoretical studies, during which a simplified mathematical model of the normal force arising from the contact of a wheel with a flat spot with a rail, assuming that as a result of this, a change in sound power is caused was developed and theoretical calculations were performed. It theoretically determined wheel damage during rolling caused by wheel-induced changes in associated sound power, i.e., preliminary values of diagnostic parameters and applied methods. Although initial theoretical research already exists, there was a lack of physical experiments to support the validity of the results of the theoretical model. This work presents the original plan and methodology of the physical experiment performed. A physical experiment performed with the ATLAS LG system and sound pressure measuring equipment showed the suitability and applicability of the theoretical model for the determination of wheel damage.
Highlights
Introduction published maps and institutional affilThe wheel/rail interaction between rolling stock is crucial for road safety, train stability, noise and comfort
The data of the sound recording were compared with ATLAS LG and the data of the video recording
This work presented the design and development of a physical experiment to validate the theoretical model for the determination of wheel damage in a real scenario
Summary
The wheel/rail interaction between rolling stock is crucial for road safety, train stability, noise and comfort. The dynamic processes between track and vehicle are mainly influenced by the force acting on the contact between the wheel and the rail. They depend on the road, the physical and mechanical properties of the wheel, the speed of movement of the wheel and the geometrical parameters. Geometrical parameters are the smoothness and defects of the rail and wheel running surfaces. There is a smooth interaction and smooth predicted dynamic processes for an ideally smooth running surface of a wheel when running at an ideal level on a rail, but when irregularities (defects) occur, the interaction becomes uneven. In the event of major defects and impact forces (up to several times the original), contact is even lost, which already iations
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