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1
Content available Study on the predictability of the vertical impact of rail vehicles running gear on rails considering weather conditions and wagon suspension load
Steišūnas Stasys, Vaičiūnas Gediminas, Bureika Gintautas, Sánchez Celestino
Transport Problems
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2022
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T. 17, z. 4
67--78
EN
The faulty running gear of rail vehicles can be identified by the results of measurements of vertical forces caused by wheel running surface damages or other wrongness of bogie suspension. Several different automatic diagnostic systems are used in European railways (operating while the trains are in service) to detect damage to rail-wheel running surfaces. The principles of this trackside equipment operation and the reliability of their measurements may differ noticeably. This is especially true in different seasons of the year (winter/summer). Data collection and aggregation results should be checked in equivalency (comparability). The authors compared the efficiency of different automatic systems in detecting wheel failures according to wheel-rail loads in different seasons of the year and presented their results. The authors also compared the similarity of results of the different measurement systems.
2
Content available Adaptation of rail passenger car suspension parameters to independently rotating wheels
Vaičiūnas Gediminas, Steišūnas Stasys, Bureika Gintautas
Transport Problems
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2022
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T. 17, z. 1
215--226
EN
This study aimed to adjust the rail passenger car running gear parameters by adapting them to independently rotating wheels. The most important aspect was the safety of the passenger car running in terms of derailment; thus, the values of the Nadal criterion were calculated first. Another aspect to consider is passenger comfort based on the values of Sperling’s comfort index according to the rail passenger car speed. The modes of suspension behaviour during operation were considered in two typical conditions: on a straight track section and on a curve with a 200-m radius. Calculations were performed using Universal Mechanism software. The results are interpreted in the paper, and the final conclusions of this study are given.
3
Content available Sperling’s comfort index study in a passenger car with independently rotating wheels
Vaičiūnas Gediminas, Steišūnas Stasys
Transport Problems
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2021
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T. 16, z. 2
121--130
EN
In this article, we compare the dynamic characteristics of cars with integral wheelsets and wheelsets with independently rotating wheels. We use Sperling’s comfort index to assess the riding comfort. We compare the riding comfort of passenger cars with integral wheelsets and wheelsets with independently rotating wheels based on Sperling’s comfort index.
4
Content available Specification of estimation of a passenger car ride smoothness under various exploitation conditions
Vaičiūnas Gediminas, Steišūnas Stasys, Bureika Gintautas
Eksploatacja i Niezawodność
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2021
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Vol. 23, no. 4
719--725
EN
The stability and smoothness of rolling stock running could be defined accurately by universal Sperling's comfort index. The divergences of variation of Sperling's comfort index of a passenger car under specific operating conditions of running gear are examining in this paper. Numerical simulations of a passenger car running with independently rotating wheels under various conditions have been performing. Gained results showed that divergences of the Sperling's comfort index variation are particularly significant due to running gear component oscillations in the horizontal plane (lateral direction). A field experiment of a passenger car with a solid (traditional) wheelset with a flat running surface proved this hypothesis. The obtained results of this experiment confirmed this assumption. Therefore, the study of the regularities of lateral oscillations of a passenger car is the logical direction of further research.
5
Content available Rail vehicle axle-box bearing damage detection considering the intensity of heating alteration
Vaičiūnas Gediminas, Bureika Gintautas, Steišūnas Stasys
Eksploatacja i Niezawodność
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2020
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Vol. 22, no. 4
724--729
EN
The article observes problems of detection of rolling bearing damages in rail vehicles. Two methods of bearing damage detection are examined – according to heating of axleboxes and by vibro-diagnostic manner. The disadvantage of vibro-diagnostic method is that a contact vibration sensor is used for vibration diagnostics, intervention into rail vehicle structure is required. The method according to heating of axle-boxes also has drawbacks. The same temperature value of axle-box in various conditions may characterize different bearing technical state. The Authors studied a possibility to use temperature change intensity parameters as the diagnostics criteria. Based on the examples of axle-box temperature measurement data, Authors developed and proposed a methodology for detecting axle-box bearings defects. The Authors suggest the use the method according to heating of axle-boxes. The given example proofs that the fact of the presence of their damages can be unambiguously identified by the intensity of temperature change of the axle-boxes.
6
Content available Effects of rail-wheel parameters on vertical vibrations of vehicles using a vehicle–track-coupled model
Steišūnas Stasys, Bureika Gintautas, Gorbunov Mykola
Transport Problems
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2019
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T. 14, z. 3
27--39
EN
This paper presents an insight into mathematical analysis of dynamic models of the vehicle–track system. After identification of its advantages and disadvantages, an improved three-dimensional "vehicle–track" system of a mathematical model is presented. It not only assesses the influence of realistic track irregularities but also on all elements of the railway structure: rail, rail pads, sleepers, ballasts, and subballast parameters on the wagon’s movement smoothness. Based on the expanded mathematical model of the “vehicle–track” dynamic system, the dynamic process of the wagon was theoretically studied, and the effect of track with irregularities on the vibrations of the wagon elements was studied. The final conclusions and recommendations are presented.
7
Content available Estimation of sand electrification influence on locomotive wheel/ rail adhesion processes
Gorbunov Mykola, Kravchenko Kateryna, Bureika Gintautas, Gerlici Juraj, Nozhenko Olena, Vaičiūnas Gediminas, Bučinskas Vytautas, Steišūnas Stasys
Eksploatacja i Niezawodność
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2019
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Vol. 21, no. 3
460--467
EN
The article describes a method of increasing the adhesion of the wheel to the rail based on the preliminary electrification of the abrasive-air mixture before its feed into a contact. A simulation model of the movement of sand in the system “injecting nozzle of a sandbox - a rail” is presented. The effectiveness of the proposed method to improve adhesion is confirmed experimentally. The results of experiments carried out on a friction machine, which characterize the change in friction ratio depending on the temperature with different methods of sand supply, are presented. The reduction in the consumption of sand caused by its electrification and the supply of a rational amount of abrasive substance into the contact of the wheel with the rail is estimated.
PL
W artykule opisano metodę zwiększania przyczepności koła pociągu do szyny polegającą na wstępnej elektryzacji mieszaniny powietrza i substancji ściernej przed jej podaniem pod koła w punkcie styku koła z szyną. Przedstawiono symulacyjny model ruchu piasku w układzie "dysza wtryskowa piasecznicy-szyna". Skuteczność proponowanej metody poprawy przyczepności badano doświadczalnie. Przedstawiono wyniki eksperymentów przeprowadzonych na maszynie ściernej, które pokazują zmiany współczynnika tarcia w zależności od temperatury przy różnych metodach podawania piasku. Oszacowano jaki wpływ na stopień zmniejszenia zużycia piasku wywiera jego wcześniejsza elektryzacja oraz racjonalne dozowanie.
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