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1

Oszczędność czasu, optymalizacja rozwiązań projektowych na przykładzie realizacji obiektów kolejowych z prefabrykatów żelbetowych

Czerwonka Bartłomiej, Matczak Kamil, Nicewicz Karolina, Stryszyk-Wieloszewska Bogumiła

Mosty

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2019

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nr 2

62--67

PL

Artykuł omawia różnorodność rozwiązań z zastosowaniem prefabrykatów wielkogabarytowych do budowy mostów na przykładzie realizacji kolejowych. Szczegółowo została opisana analiza rozwiązań projektowych wraz z pokazaniem zmian w pierwotnych rozwiązaniach.

EN

The article presents the variety of precast concrete elements optemARCH and optemFRAME. It describes how good cooperation between the participants of an investment process can provide the best construction solution and fine economic results. The paper also presents the advantages and disadvantages of using a reinforced concrete connection between two precast concrete elements based on static calculations.

2

Strategic development of cargo transit services: a case study analysis

Shpak N., Dvulit Z., Luchnikova T., Sroka W.

Engineering Management in Production and Services

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2018

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Vol. 10, no. 4

76--84

EN

Purpose. Recently, foreign economic activity in Ukraine has gradually shifted towards the European Union (EU). The EU’s special interest in the potential of Ukraine’s transit transport lies in the geographical position of the country, which is located on the main routes of international freight traffic. The article aims to study the status and development opportunities in the field of transit freight transport of the Ukrainian railway joint-stock company (JSC Ukrzaliznytsya) within the framework of European integration. Methodology. The article presents the analysis of the activity of the JSC Ukrzaliznytsya in the field of transit freight transport for the period of 2005-2017 and outlines the strategic prospects for its development as a significant transit route considering the conditions of European integration. The methodology included theoretical and practical research using statistical methods; methods of comparative analysis; ABC analysis method; and taxonomic method. Results. The JSC Ukrzaliznytsya was analysed to determine the status of its activity in the field of transit freight transportation for 2005-2017. A structural-dynamic analysis was made to estimate cargo volumes transported by railway enterprises and related revenues. 18 types of cargo were identified using the ABC analysis method based on two indicators, namely, “volumes of transportation” and “revenues from cargo transit”. Also, taxonomic indicators of the level of system development were considered and revenues from cargo transit for the analysed period were estimated. Finally, recommendations were proposed regarding the development of a joint-stock company as a strategic cargo transporter under the conditions of European integration with Ukraine. Practical implications (if applicable). The results of the conducted research and performed calculations confirmed the need to refocus the management activity of the JSC Ukrzaliznytsya in the field of cargo transit towards strategically important cargoes, which have the largest share in the structure of financial results. This will enable the company to achieve its leading role as a strategic transit carrier of the European Union in the near future.

3

Some aspects of heuristic algorithms and their application in decision support tools for freight railway traffic organization

Jacyna M., Gołębiowski P., Krześniak M.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2017

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z. 96

59--69

EN

Rail traffic organization is a multifactorial decision-making problem. To achieve the best results and reduce the risk of error when deciding on its implementation, appropriate algorithms should be identified and implemented in the form of computer tools, allowing for the optimal solution to be obtained. This paper discusses the process of organizing freight traffic on the rail network. The algorithm of relocating loaded cars in a compact and dispersed system is discussed. In turn, it is been indicated that the movement of empty and loaded cars must follow a strictly defined timetable. A heuristic algorithm supporting decision-making in the area of rail freight traffic management is presented, divided between the concept development stage, the timetable design stage for the developed concept, and its implementation in the form of specialized tools. An example of how the application works is also presented.

4

Linear positioning of railway objects

Irlik M.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2017

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z. 96

49--57

EN

The article provides an explanation of the issue related to the linear positioning of railway objects in the context of preparing site data for automatic train protection systems, such as the European Rail Traffic Management System/European Train Control System (ERTMS/ETCS). This paper identifies and compares current approaches for an object’s position based on a line chainage for orientation and documentation purposes, as well as the object’s position based on a track axis for the calculation of real world distances, along with providing examples of measurement systems and presenting conclusions from test runs for ERTMS/ETCS Level 2 purposes.

5

Simulation modelling of Vitória-Minas closed-loop rail network

Faria C. H. F. de, Cruz M. M. da Costa

Transport Problems

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2015

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T. 10, z. spec.

125--139

EN

This paper presents a closed loop simulation model that represents the mining logistics chain of the Vitória Minas Railway (VMR), Brazil. The simulator includes the loading process, circulation of loaded trains, unloading of ores for external and internal markets and the distribution of empty trains for new loads. General cargo and passengers trains are also included in the model, which, along with the queues formed in the circulation and the preventive and corrective maintenance of rolling stock, tracks and equipment, interfere with the transportation of iron ore. The primary objective of the iron ore transport is to meet the daily loading and unloading schedules and minimize queues by maximizing the operations at the loading and unloading points. The VMR simulator developed uses macro-mesoscopic approach with Monte Carlo simulation. To validate the simulator, we used actual data of the railway and compared with reality. We obtained a very good adhesion to the value of 2.9% for the validation scenario (Scenario 1) and 3.4% for the scenario with reducing the number of lots of wagons (Scenario 2). We concluded with this simulation that it is possible to reduce the number of GDE wagons without reducing the current level of productivity of the rail system.

PT

Este artigo apresenta o modelo de simulação do circuito fechado da rede logística de minério de ferro da ferrovia Vitória Á Minas (VMR), Brasil. O simulador inclui o processo de carregamento, circulação dos trens carregados, descarregamento para os mercados externos e internos e a distribuição dos trens vazios para novos carregamentos. Os trens de carga geral e de passageiros também foram incluídos no modelo, bem como suas filas de formação e as manutenções preventivas e corretivas do material rodante, que interferem no transporte do minério de ferro. O principal objetivo do transporte de minério de ferro é atender as programações de carregamento e descarregamento e minimizar as filas maximizando as operações nos pontos de carregamento e descarregamento. O simulador VMR desenvolvido utiliza uma abordagem macro-mesoscópica de simulação de Monte Carlo. Para validar o simulador, foi utilizado dados da ferrovia e comparado com a realidade. Obtivemos uma aderência muito de 2,9% para o cenário de validação (cenário 1) e 3,4% para o cenário com a redução do número de lotes de vagão (cenário 2). Concluímos que com esta simulação é possível reduz o número de lotes de vagões GDE sem reduzir a produtividade da ferrovia.

6

Soil and plants contamination with selected heavy metals in the area of a railway junction

Staszewski T., Malawska M., Studnik-Wójcikowska B., Galera H., Wiłkomirski B.

Archives of Environmental Protection

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2015

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Vol. 41, no. 1

35--42

EN

Heavy metal (As, Mn, Ni, Sn, Ti) concentrations were determined in soil and plant samples collected in different areas of the railway junction Iława Główna, Poland. Soil and plant samples were collected in four functional parts of the junction, i.e. the loading ramp, main track within the platform area, rolling stock cleaning bay and the railway siding. Four plant species occurring in relatively higher abundance were selected for heavy metals analysis, although in the loading ramp and platform areas only one species could be collected in the amount which makes chemical analysis possible. The selected species included three perennials (Daucus carota, Pastinaca sativa and Taraxacum offi cinale) and one annual plant (Sonchus oleraceus). The entire area of the railway junction showed elevated concentrations of heavy metals when compared to the control level. It was most pronounced for the platform area and railway siding. The concentration of arsenic, manganese and nickel in plants growing in these parts of the junction exceeded the toxic level. The highest contamination of soil and plants found in the platform area suggested advanced emission process of the analyzed metals from wheel and track abrasion. Literature review showed that the concentration of the investigated metals in soil was generally higher than that found in centers of cities and along traffi c roads proving that the railway is an important linear source of soil contamination.

PL

W pracy przedstawiono wyniki badań dotyczące zawartości wybranych metali ciężkich (As, Mn, Ni, Sn, Ti) w glebie i roślinach na obszarze węzła kolejowego Iława Główna. Próby gleby i roślin pobierano w czterech częściach węzła, a mianowicie na rampie załadowczej, torowisku głównym, myjni i bocznicy kolejowej. Na całym obszarze węzła kolejowego stwierdzono podwyższone stężenia metali ciężkich w porównaniu z terenem kontrolnym. Najwyższe stężenia stwierdzano na torowisku głównym i bocznicy kolejowej. Stężenie arsenu, manganu i niklu w roślinach występujących na tym obszarze przekracza poziom toksyczny. Najwyższe zanieczyszczenie gleby i roślin stwierdzane na torowisku wskazuje na występowanie procesów emisji metali spowodowanych ścieraniem kół i szyn. Porównanie z danymi literaturowymi wskazuje, że stężenie badanych metali w glebie jest większe niż w glebach centów miast i wzdłuż drogowych szlaków komunikacyjnych, co dowodzi, że linie kolejowe stanowią istotne liniowe źródło zanieczyszczenia gleby.

7

Area claims of the passengers at mass public transport hubs

Havlena O., Jacura M., Javorik T., Svetlik M.

Transport Problems

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2013

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T. 8, z. 2

83--88

EN

The article presents the results of the first period of a research carried out at The Czech Technical University in Prague, Faculty of Transportation Sciences, which is aimed to set the optimal dimensions of waiting areas in the premises of public mass transport change nodes. It is aimed especially at a structure of passengers using public transport expressing the percentage of each of the groups for which different areal demands are characteristic. Such survey has not been carried out in the Czech Republic so far. Application of the research, of which the first outputs are presented in this article, allows us to upgrade an outdated methodology for setting an appropriate dimensions of public parts of railway station buildings, which is still used in the Czech Republic.

PL

Artykuł przedstawia rezultaty pierwszego okresu badań przeprowadzonych w Czeskim Uniwersytecie Technicznym w Pradze (Wydział Nauk Transportowych), którego celem było określenie optymalnych wymiarów przestrzeni oczekiwania w lokalach publicznych masowych transportowych węzłów wymiany. Ma to na celu, zwłaszcza w strukturze pasażerów używających transportu publicznego, procentowe wyrażenie każdej grupy, dla której charakterystyczne są różne wymagania przestrzenne. Takie badanie nie zostało jeszcze wykonane w Republice Czeskiej. Zastosowanie badania, którego pierwsze wyniki zostały zaprezentowane w tym artykule, pozwala nam na uaktualnienie przestarzałej metodologii w celu opracowania odpowiednich wymiarów dla publicznej części budynków stacji kolejowych, które są w Czechach nadal używane.

8

Mechanism of wheel-flat failures and evaluation of high strength steels for prevention of the failures

Kigawa T., Kimoto E.

International Journal of Applied Mechanics and Engineering

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2002

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Vol. 7, Spec. is

357-363

EN

By using high strength steels wheel-flat tests and flat-induced shelling tests are performed. Test results are evaluated from the viewpoint of the occurrence of surface damages such as thermal cracks, fatigue cracks and wear. An austenitic steel with nearly the same hardness as that of the present wheel steel is estimated to be a better steel material from the viewpoint of the occurrence of these failures.