چكيده به لاتين
One of the main problems in railway networks around the world is rail corrugation or sinusoidal irregularities of the rail surface. Rail corrugation causes heavy loads in contact area which, leads to generation of noise and damaging the vehicle and track components. Creep forces and slip between wheels and rails are prone to corrugation growth, especially in curves. In this study, a simulation of the multi-body dynamic interaction between the vehicle and the curve track is performed and the rutting corrugation that occurs in the low rails in sharp curve is considered for the study. The effect of applying friction modifier in curves without irregularities and with irregularities of corrugation is also investigated. A long-edge freight wagon with an 18-100 bogie is simulated in Universal Mechanism's multi-body software. Then, the effects of curve radius and coefficient of friction as variables were investigated for tracks without irregularities and with corrugation irregularities. The periodic forces in the contact area are one of the corrugation irregularities results. The corrugation irregularities increase by each time that train crosses the track. According to the results obtained from simulations, it was found that when passing through the curve, strong contact effects occur in the contact area of the leading wheels and rails. It was also observed that the leading wheels have a higher wear index compared to other bogie wheels. The reason for this can be related to the large creepages created in the contact area of the leading wheels, which leads to the growth and intensification of corrugation. In addition, it can be seen that the larger the radius of the curve, the lower the intensity of the forces in the contact area and the better the passage through the curve. Finally, it was found that the application of friction modifier on the rail, reduces the effects created in the contact area and reduces the fluctuations caused by passing through the irregularities of corrugation.
