Numerical simulation an‎d measurement study of track-train interaction in a curve to investigate ride comfort

2/3/2025 12:00:00 AM

Today, we are witnessing increasing competition in the railway transportation services market. As a result, passengersʹ expectations regarding travel conditions are growing. Ride comfort is becoming one of the main mechanisms for attracting passengers to railway transportation services an‎d influencing their choice between various means of transportation. Ride comfort is one of the most important indicators of a railway vehicle. Therefore, the dynamic performance of a railway vehicle, which includes two parts: comfort an‎d safety, is eva‎luated with the indicators of ride quality, wagon stability, an‎d curve passing ability. As in the research conducted in this field, the movement of a railway vehicle in a curve due to the presence of centrifugal force in circular motion causes negative effects such as reduced passenger comfort, increased vibrations, increased lateral load, etc. on the railway line an‎d the vehicle. When the radius of the curve in the railway line is small, the track width is increased to facilitate the movement of vehicles an‎d reduce wheel an‎d rail wear. The increase in speed on railway lines an‎d the development of science an‎d technology in this field make the geometric parameters of railway lines an‎d their related approaches more sensitive. By reviewing the technical literature on the subject, it is clear that curves are among the parameters that affect the accelerations created on the line an‎d the fleet an‎d play an effective role in the level of travel comfort. Therefore, given the technical an‎d research gap in the field of the simultaneous effect of curves, speed, roughness, an‎d damping ratios of suspension systems on the railway line on travel comfort, this study has been investigated. In this study, by performing numerical modeling an‎d using Universal Mechanism software, the changes in the arc radius, speed, roughness, an‎d vertical an‎d lateral damping ratios on the Ride Comfort Index have been investigated. The modeling results have been verified with the field experiment of the reference thesis. In general, from the findings of this study, it can be seen that the effect of speed an‎d radius on the Ride Comfort Index, along with the role of the damping ratio of suspension systems in various uneven conditions, has been analyzed. The results show that the Ride Comfort Index increases with increasing speed an‎d decreasing the arc radius. Also, the effect of undesirable irregularity an‎d adjusting the damping ratios on the suspension performance has been carefully investigated. Therefore, there are very large differences between the damping ratios of the suspension systems required to minimize the Ride Comfort Index at the center of the body an‎d the damping ratios of the suspension systems to minimize the Ride Comfort Index above the bogies. Also, a very low damping ratio of the suspension system is necessary to minimize the Ride Comfort Index at the center of the body, which worsens the Ride Comfort at the points above the bogies. Therefore; examining the effect of the arc radius of the track on the Ride Comfort Index in the range of 5000 to 9000 meters shows that the Ride Comfort Index improves with increasing the arc radius of the track.

راه‌آهن پرسرعت , سامانه تعليق , ارتعاش قطار پرسرعت، ناهمواري عمودي , شاخص راحتي سفر , الگوسازي عددي

High-speed railway , suspension system , high-speed train vibration , vertical irregularity , ride comfort index , modeling

Sadegh salami nia

Saeed Reza massah