Methodology for studying impulse disturbance from rail joints to the railway vehicle and assessment of the efficiency of the new spring suspension

Viktor Nekhaev,Viktor Nikolaev,Evgenii Cheltygmashev,A.D Abramov,V Murgul

doi:10.1051/matecconf/201823901032

Viktor Nekhaev, Viktor Nikolaev + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/201823901032

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Abstract

The methodology for studying the impulse disturbance of the railway track joints on the indicators of the dynamic qualities of the railway vehicle has been developed. The dependence of the impulse repetition factor on the energy dissipation level in the system and the speed of the vehicle is obtained. A comparative assessment of the dynamic qualities of a freight car with a typical scheme of spring suspension and a car with suspension based on the principle of compensation of external disturbances is performed. It has been established that the spring suspension of a freight car based on the principle of compensation of external disturbances delivers to it significantly better indicators of dynamic qualities in comparison with car equipped with a new three-piece truck with a typical scheme of springs. Vertical acceleration of the car’s body with a new scheme of vibration protection and dynamic forces in spring suspension is several times less than for a car with a typical three-piece truck structure.

Highlights

IntroductionThe strategy for the development of railway transport involves the expansion of the range of high-speed passenger trains, the creation and organization of high-speed container traffic, as well as the heavy traffic of trains with increased axial and linear loads
When the trains move along the continuous welded rail track, the joints of the rails, especially in winter, exert an even higher shock impact on the truck units [2], causing fatigue cracks and fractures, which threaten the safety of train traffic
The annual number of rails withdrawal on the railway network exceeds 102,000 [1]. It is shown in work [3] that in the case when the wheel set hits the junction with the depression of ballast of 10 mm at a speed of 51 km/h, the impact force can reach 468 kN. The consequence of such high impact loads due to increased stiffness of the track during the winter operation period, large gaps and cracking of metal particles at the ends of rails, and imperfections in casting technology on Russian railways is the large number of cracks in the truck units, leading to their breaks

Summary

Introduction

The strategy for the development of railway transport involves the expansion of the range of high-speed passenger trains, the creation and organization of high-speed container traffic, as well as the heavy traffic of trains with increased axial and linear loads. The annual number of rails withdrawal on the railway network exceeds 102,000 [1] It is shown in work [3] that in the case when the wheel set hits the junction with the depression of ballast of 10 mm at a speed of 51 km/h, the impact force can reach 468 kN. The consequence of such high impact loads due to increased stiffness of the track during the winter operation period, large gaps and cracking of metal particles at the ends of rails, and imperfections in casting technology on Russian railways is the large number of cracks in the truck units, leading to their breaks. If we take into account that the share of the continuous welded rail track on the operating domain of the Russian railways remains significant, the problem arises to develop a methodology for studying impulse disturbance from rail joints to rolling stock, which is necessary for assessing the efficiency of the newly designed spring suspension of the freight car

Research methodology

Conclusions