Increasing the Efficiency of the Railway Operation in the Specialization of Directions for Freight and Passenger Transportation

Kurhan, M. B.; Kurhan, Dmytro; Hmelevska, Nelya

doi:10.12700/aph.19.3.2022.3.18

Cited by 14 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Under the conditions of stability, strength and reliability in operation of the track and travel comfort, the structure of the train flow and distribution in it, the categories of trains should be appointed depending on the classification of directions of trains movement [21,22]. Table 2 shows characteristics for the direction of high-speed trains traffic.…”

Section: Determination Of the Transition Curves Length In The Directi...mentioning

confidence: 99%

Determination of the type and the length for the transition curves on the directions of high-speed train operation

Kurhan

Hmelevska

2022

Acta Tech. Jaurinensis

Self Cite

View full text Add to dashboard Cite

In many countries around the world, a cubic parabola is used as transition curves in a simplified form. Today, the properties of many mathematical curves are well studied, which can be used as transition curves. The object of research is the process of restructuring transition curves when organizing high-speed trains operation. The use of modern means of mathematical modelling allows to add a number of dynamic characteristics for evaluation parameters of motion in the curved sections of the tracks. Thus, with an increase in speed for transition curves, both the values of unbalanced acceleration and its change in time, and also the velocity attenuation of oscillations of rolling stock when moving from a transition curve to a circular curve or to a direct section. On the basis of the conducted research, it has been found that when increasing the speed of the vehicle movement in the range from 120 to 200 km/h, the length of the stabilization section increases at the output of the curvature by an average of 20 m for every 40 km/h. The analysis showed that with correctly set parameters of transition curves, which correspond to the maximum speed of movement and radius of a circular curve, the strength and reliability of the bearing elements in the structure of the permanent way and the travel comfort are fully ensured.

show abstract

Section: Determination Of the Transition Curves Length In The Directi...mentioning

confidence: 99%

Determination of the type and the length for the transition curves on the directions of high-speed train operation

Kurhan

Hmelevska

2022

Acta Tech. Jaurinensis

Self Cite

View full text Add to dashboard Cite

show abstract

“…There is a large body of research on the subject, so a wide range of literature is available. There are also an extensive number of peer-reviewed journals on the study of abrasion and fragmentation; however, in the area of transport engineering [6,7], research is being carried out in almost all fields, from mining, rock physics, geology [8][9][10], mechanical and vehicle engineering [11], to architecture and civil engineering [12][13][14] and [15,16], as well as logistics [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Testing the fragmentation of railway ballast material by laboratory methods using Proctor compactor

Huschek-Juhász,

Németh,

Sysyn

et al. 2024

Nauk. visn. nat. hirn. univ.

View full text Add to dashboard Cite

The physical classification of crushed stone and gravel used in railway construction is based on their strength and endurance and is performed by a laboratory test method using a rotating drum or a mortar method. The values of fracture resistance calculated using the Los Angeles method and abrasion calculated using the Micro-Deval method show a corresponding correlation and require further investigation. Purpose. The development of a new method for measuring rock material fracture that is consistent with widely used standards while also being more comparable to real-world railway operating conditions. Certainly, both standard tests are essential for ensuring product homogeneity during production, so the new recommended method is only a supplement. Methodology. The Proctor device was used to induce so-called shock loads from above, similar to railway loading conditions. Unlike the standard method, the andesite material was placed in a standard cylinder in these tests. The samples were pre-screened and sorted; the specified weight was approximately 1,300 g, and the specified sizes of the individual particles were 6.3, 8.0 and 11.2 mm. Only prewashed and dried materials of NZ (fine crushed stone) or KZ (special crushed stone) from four different quarries (Tállya, Szob, Nógrádkövesd, Recsk) with different rock physics characteristics were considered. The Proctor compactor machine was used because of its calculable labor (19.86 J/impact) and the crushing effect of the calculable impacts (64, 128, 256 and 1,028 blows). Even after loading different numbers of impacts, homogeneous samples from different quarries were sieved to measure the masses of fragments per fraction. Findings. The set of measurements made it possible to establish a series of fragmentation and degradation curves for each of the three repeated measurements based on the composition of the material and the number of blows, which showed the degradation of samples with different physical and mechanical properties of the rock material and particle sizes. With an increasing number of impacts, the amount of crushed material in the sample increased, but the distribution of crushed material did not decrease evenly and proportionally as the number of impacts increased. Parameters and indices were also computed to identify various correlations (i. e., FV, d < 22.4, d < 0.5, d < 0.063 mm, CU, M ratio,  ratio). Some of them (e. g., FV) needed to be changed, but they were predefined due to the nature of the tests. Originality. While many standard and alternative railway track ballast fragmentation test methods and measurement tools are available, this paper proposes a new laboratory method and demonstrates the specific measurement and application effectiveness. Practical value. In addition to standard tests that are already widely used, the new method for measuring the fractional composition of railway ballast can help simulate real-world operating conditions of a railroad track in the laboratory. This method will improve the safety of railway operations.

show abstract

“…The other side is also a key factor: the railway infrastructure (permanent way, overhead wires, signaling, etc.). Of course, there is always a strong connection between all the parts [9][10][11][12][13][14][15]. It means that the worse the railway track geometry, the higher the needed traction energy demand of the vehicles, and so on.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Track Gauge and Alignment Parameters of Ballasted Railway Tracks Based on Real Measurements Using Signal Processing Techniques

et al. 2023

View full text Add to dashboard Cite

This paper deals with the time-frequency characteristic analysis for track geometry irregularities using field data recorded by a comprehensive track inspection train. The parameters of the track gauge and the left and right rail alignment are considered to identify their characteristic wavelengths and the locations of their waveforms. In addition to the conventional time and frequency domain analysis, auto-adaptive signal decomposition techniques are used on four pre-selected track sections. During the time series analysis of the track gauge, the cumulative difference from the mean value is calculated, which makes it possible to distinguish the track section constructed with non-standard initial track gauges. The sensitive wavelengths of the track irregularities are obtained from the proper allocation of wavelength ranges in the Fourier Amplitude Spectrum of the original signal and the Fourier transform of the components detected by the Variational Mode Decomposition. This analysis can elucidate the wavelengths and positions of track irregularities that affect vehicle responses.

show abstract

Increasing the Efficiency of the Railway Operation in the Specialization of Directions for Freight and Passenger Transportation

Cited by 14 publications

References 0 publications

Determination of the type and the length for the transition curves on the directions of high-speed train operation

Determination of the type and the length for the transition curves on the directions of high-speed train operation

Testing the fragmentation of railway ballast material by laboratory methods using Proctor compactor

Investigation of Track Gauge and Alignment Parameters of Ballasted Railway Tracks Based on Real Measurements Using Signal Processing Techniques

Contact Info

Product

Resources

About