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Wyświetlanie 1-12 z 12
Tytuł:
Assessment of railway lines: an efficiency rating analysis for baltic countries
Autorzy:
Vaičiūnas, G.
Powiązania:
https://bibliotekanauki.pl/articles/375497.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
rail Baltica
railway line
train
container train
geometric mean
Rail Baltica
linia kolejowa
pociąg
pociąg kontenerowy
średnia geometryczna
Opis:
The article investigates a possibility of using the traditional multi-criteria assessment methods to evaluate how significance of a railway line is distributed for the countries it crosses. The article analyses two examples of railway lines: the railway line Rail Baltica (Poland, Lithuania, Latvia and Estonia) and the container train Viking route (Lithuania, Belarus and Ukraine). When investigating for which countries the Rail Baltica project will have bigger significance, and for which smaller, indicators of the countries are analysed by the length of Rail Baltica in the country, length falling per million residents in the country, length falling per thousand km of the existing railway, length per area of the county and length falling per country’s gross domestic product (GDP). To generalize them, multi-criteria optimization methods, such the geometric mean method, were used. To answer the question whether the methodology used is adequate, it was tested using the example of the already operating container train Viking. The results of calculations for the previously mentioned criteria are combined with the actual distribution of the freight turnover. A positive conclusion is made about the adequacy of the methodology to assessment of the importance of the railway line for the country.
Źródło:
Transport Problems; 2018, 13, 1; 49-58
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A framework for categorizing risks in High Speed Train (HST) projects: the example of the first HST in Brazil
Uma estrutura para categorização de riscos em projetos de trens de alta velocidade (TAV): o exemplo do primeiro TAV do Brasil
Autorzy:
Grubisic, V.
Zagheni, E.
Asaff, Y.
Dias, A.
Powiązania:
https://bibliotekanauki.pl/articles/374715.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
framework
risk
high speed train
Brazil
struktura
ryzyko
pociąg ekspresowy
Brazylia
Opis:
High Speed Train projects are exposed to risks of different natures, such as: low participation of private companies in the new railways construction, lack of skilled labor, high technology not available in the internal market, high costs with land acquisition, among others. Such risks if not managed properly can become real problems and compromise the achievement of the project objectives. The risk identification is the process of collection and description of events that can have negative effects on the project. This process should consider the project uncertainty elements in order to generate specific results. In the case of HST projects, examples of uncertainty elements are: politics, economy, environment, human resources and technology. Therefore, this study aims to present a framework for categorizing risks to be used in HST projects. Also, for each category proposed some risk examples are suggested. An overview of the first Brazil HST project is showed and the risk framework is proposed. A discussion on the risks in the first Brazil HST project are presented followed by final conclusions.
Projetos de trens de Alta Velocidade estão expostos a riscos de diversas naturezas como: baixa participação de empresas privadas na construção de novas ferrovias, falta de mão de obra especializada, tecnologia de ponta não disponível no mercado interno, altos custos com aquisição de terrenos, alto impacto ambiental, entre outros. Tais riscos senão forem gerenciados corretamente podem se tornar problemas e comprometer os objetivos do projeto. A identificação de riscos é o processo de coleta e descrição de eventos que podem ter efeitos negativos sobre o projeto. Este processo deve considerar os elementos de incerteza do projeto, a fim de gerar resultados específicos. No caso de projetos de TAV, são exemplos de elementos de incerteza: política, economia, meio ambiente, recursos humanos e tecnologia. Portanto, este estudo tem como objetivo apresentar uma estrutura para classificar os riscos a ser usada em projetos de TAV. Para cada categoria de risco, exemplos de riscos são apresentados. Uma visão geral do primeiro projeto de TAV do Brasil e seus principais riscos são mostrados. Finalmente, tem-se uma discussão sobre os principais resultados do artigo e as conclusões finais.
Źródło:
Transport Problems; 2015, T. 10, z. spec.; 37-46
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A standardised language code for rail freight operations
Standaryzowany język kodów dla obsługi pociągów towarowych
Autorzy:
Marinov, M.
Zunder, T.
Arnoldus, R.
van der Moolen, C.
Powiązania:
https://bibliotekanauki.pl/articles/375246.pdf
Data publikacji:
2012
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
przewozy kolejowe
pociąg towarowy
kod językowy
rail freight
freight train
language code
Opis:
In this paper a standardised language code for rail freight operations is developed that aims to facilitate communication between dispatchers, train drivers and traffic managers when running freight trains abroad. In developing the language code the existing situation in the bi-lingual Belgian railways has been taken as a starting point. Communication codes from public services like police, fire brigade, ambulance and military services have been studied. It is believed that, if implemented, the code will improve significantly integrated rail freight services in Europe.
W niniejszej pracy zaprezentowano rozwój standaryzowanego kodu językowego dla obsługi pociągów towarowych, którego celem jest ułatwienie komunikacji pomiędzy dyspozytorami, motorniczymi oraz zarządzającymi ruchem podczas wysyłania pociągów towarowych za granicę. W rozwoju kodu językowego, w obecnej sytuacji, na początek zwrócono uwagę na dwujęzyczne koleje belgijskie. Kody komunikacyjne dla służb publicznych takich jak policja, straż pożarna, karetki pogotowia oraz wojsko zostały przeanalizowane. Wierzy się, że wraz z wprowadzeniem kodów zintegrowany transport kolejami towarowymi w Europie zdecydowanie się polepszy.
Źródło:
Transport Problems; 2012, 7, 2; 141-148
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generating and modeling of braking curve and the assessment of the quality of automatic stopping of the train
Autorzy:
Anuszczyk, J.
Gocek, A.
Pacholski, K.
Dominikowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/374056.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
train
braking
docking
quality factor
controller
simulation
pociąg
hamowanie
dokowanie
wskaźnik jakości
kontroler
symulacja
Opis:
This paper presents the theory about generating the braking curve and the analysis of the influence of the braking controller parameters on the generation of the braking curve of the train. In this paper, computed examples of braking quality developed using generic quality factor are shown, and on the basis of the calculations, weight components of the factor and an additional criterion for assessing the quality of braking were proposed. It has been demonstrated that the developed algorithms can be used to verify the effectiveness of the braking controller and the adjustment of the terms, and the change of these algorithms affects the shape of the generated braking curve of the train. It has been shown that the analysis of a failure of the propulsion car revealed the existence of a safe braking area. The performed statistical analysis confirmed the normal distribution of the scatter of braking results, for which the regression model fitted.
Źródło:
Transport Problems; 2018, 13, 2; 13-25
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of artificial neural networks for shortterm prediction of container train flows in direction of China – Europe via Kazakhstan
Autorzy:
Abdirassilov, Z.
Sładkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/375202.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
container train
international transport corridor
artificial neural networks
pociąg kontenerowy
międzynarodowy korytarz transportowy
sztuczna sieć neuronowa
Opis:
International container transport plays an important role in the exchange of goods between China and Europe, and accordingly, the efficiency of the transportation increases with the organization of special container lines (land and sea). Owing to its geographical location, the territory of Kazakhstan has become one of the main international landlines for passage of container cargo in recent years. Priority is given to solution of such problems as reduction of cargo delivery time, simplification of customs operations, setting attractive and competitive tariffs, ensuring a high degree of cargo safety, development of transport infrastructure, assessment of the transit potential of railway network of the country, and predicting future cargo flows. This article shows the use of artificial neural networks (ANN) for predicting container train flows in the direction of China – Europe. For this purpose, a three-layer perceptron with a learning algorithm, based on the back-propagation of the error signal, was used. A concreto example shows how the ANN training process is conducted and how the adjustable parameters are selected.
Źródło:
Transport Problems; 2018, 13, 4; 103-113
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approach method for flexible reallocation of reserved seats on long - distance trains
Autorzy:
Grunewald, Erik
Rudolph, Florian
Tremer, Daria
Powiązania:
https://bibliotekanauki.pl/articles/2098080.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
passenger change
pedestrian simulation
seat reservation
long distance train
zmiana pasażera
symulacja ruchu pieszego
rezerwacja miejsc
pociąg dalekobieżny
Opis:
Finding a reserved seat on long-distance train travel is supported by aids on platforms and within the train in order to keep the passenger’s journey as short as possible and to minimise unnecessary walking within the train. The allocation of a seat to a carriage number on the reservation and the consideration of the carriage position indicator devices on the platform provide the opportunity to wait for the arrival of the train on a section of the platform that is close to the reserved seat. Nevertheless, there are various situations in reality in which this can only be achieved to a limited extent. Varying carriage order, the provision of a replacement train or tight transfer connection can lead to the train being entered at an unfavourable position. This is followed by the passenger trying to find a seat on the train which can amount to considerable traffic. Equipped with a flexible seat reservation procedure, this kind of traffic could be drastically reduced. The solution provides the opportunity to reallocate reserved seats in order to minimize the way a passenger has to walk inside the train to his seat. By means of microscopic simulations, various boarding scenarios demonstrate the effectiveness of this approach. Less passenger movement on the train results in an increase in passenger comfort and reduces the space that is required for such movement, which could instead be used for other purposes. On the platform, this procedure means that passengers no longer need to wait for the arrival of the train at a location that is closest to the allocated seat. Instead, passengers can choose a place on the platform convenient to them, without this having a disruptive effect on system performance.
Źródło:
Transport Problems; 2021, 16, 1; 87--100
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of transverse stability parameters of hybrid buses with active trailers
Autorzy:
Sakhno, V.
Poliakov, V.
Murovanyi, I.
Selezniov, V.
Vovk, Y.
Powiązania:
https://bibliotekanauki.pl/articles/196391.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
bus
hybrid auto-train
transverse stability
stiffness
suspension
roll
autobus
auto-pociąg hybrydowy
stabilność poprzeczna
sztywność
zawieszenie
rolka
Opis:
The objective of the article is to determine the transverse stability indexes of hinge-connected buses (HCBs) by applying the computation-analytical method. The transverse stability parameters of hybrid buses with active trailers are analysed. Based on these parameters (the angles of the roll and redistribution of loads on the sides), the analytical dependences are developed. The dependences describe the movement of the parts of HCBs in the vertical plane. Considering the action of longitudinal and transverse forces, the roll angles of the bus and the trailer were determined. The limiting angle of the side roll of the bus rollover was found to be γамах = 27.560γмах, and the trailer rollover to be γамах = 30.210. The obtained transverse stability indexes of HCBs with a hybrid power plant testify to the compliance with the standard DSTU UN/ECE R 111-00.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 101; 185-201
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
To the comparative evaluation of three-unit lorry convoys of the different component systems by maneuverability
Autorzy:
Sakhno, Volodymyr
Poliakov, Viktor
Lyashuk, Oleg
Murovanyi, Igor
Stelmashchuk, Valeriy
Onyschuk, Vasyl
Tson, Oleg
Rozhko, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/27314539.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
car train
maneurability
folding angle
traffic band
control drive
trajectory
pociąg drogowy
zwrotność
kąt składania
pas ruchu
sterowanie napędem
trajektoria
Opis:
The article deals with the maneuverability of three-link road trains with various layout schemes. If a train has more than three links, difficulties arise in that the study of the movement of such a multi-link vehicle is significantly complicated due to the need to take into account the influence of a significant number of factors on the nature of the movement of all links. The interaction of neighboring units in the movement of a train is eventually distributed to the entire vehicle and causes certain deviations of the components of the train (modules) from the direction of movement specified by the driving link (tractor). Considering that a road train as a motor vehicle is a means of increased danger, when solving problems about the possibility of operating three- and multi-link road trains, it is one of the first to take steps towards theoretical studies of their maneuverability, the results of which will be the basis for answering many technical, organizational, and legal questions. Analysis of the calculation results showed that in the established circular path with the selected gear ratios of the control drives, none of the road trains met the requirements of DIRECTIVE 2002/7 / EC. From this, it follows that for three-link road trains, a fundamentally different control drive is needed, which can be a double control drive.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 121; 189--201
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probabilistic approach for the determination of cuts permissible braking modes on the gravity humps
Вероятностный подход к определению допустимых режимов торможения отцепов на сортировочных горках
Autorzy:
Bobrovskyi, V.
Kozachenko, D.
Dorosh, A.
Demchenko, E.
Bolanovska, T.
Kolesnik, A.
Powiązania:
https://bibliotekanauki.pl/articles/374423.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
marshalling yard
freight train
gravity hump
braking mode
brake position
stacja rozrządowa
pociąg towarowy
próg grawitacji
tryb hamowania
pozycja hamowania
Opis:
The paper presents the research results of cuts braking modes on the gravity humps. The objective of this paper is developing the methods for assessment of braking modes of cuts under conditions of fuzziness of their rolling properties, as well as selecting the permissible starting speed range of cuts from retardant positions. As a criterion for assessing the modes of target control of cut rolling speed, it was proposed to use an average gap size on a classification track at the established norms of probable exceeding of permissible speed of cars collision and their stop in retarders. As a criterion for evaluating the modes of interval control of cuts rolling speed, using the risk of their nonseparation on the switches was proposed. Using the simulation modeling and mathematical statistics, the configuration of the range of permissible speed of cuts coming out from retardant positions has been set. The conducted researches allow simplifying the choice of cut braking modes in systems of automatic control of cut rolling speed.
В статье представлены результаты исследований режимов торможе-ния отцепов на сортировочных горках. Целью статьи является разработка методов оценки режимов торможения отцепов в условиях неопределенности их ходовых характеристик, а также поиск области допустимых скоростей выхода отцепов из тормозных позиций. В качестве критерия для оценки режимов прицельного регу-лирования скорости скатывания отцепов предложено использовать среднюю вели-чину окна на сортировочном пути при установленных нормах вероятности превы-шения допустимых скоростей соударения вагонов и остановки их в замедлителях. В качестве критерия для оценки режимов интервального регулирования скорости скатывания отцепов предложено использовать риск их неразделения на стрелках. Спомощью методов имитационного моделирования и математической статистики установлена конфигурация области допустимых споростей выхода отцепов из тор-мозных позиций. Выполненные исследования позволяют упростить решение задачи выбора режимов торможения отцепов в системах автоматического управления скоростью их скатывания.
Źródło:
Transport Problems; 2016, 11, 1; 147-155
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of ahp method for examining the transport plan of passenger trains in bulgarian railway network
Autorzy:
Stoilova, S.
Nikolova, R.
Powiązania:
https://bibliotekanauki.pl/articles/374677.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
analytic hierarchy process
AHP method
intercity train
railway passenger transport
Analityczny Proces Hierarchiczny (AHP)
metoda AHP
pociąg intercity
pasażerski transport kolejowy
Opis:
In this study, a methodology was developed for transport plan selection of intercity trains in railway network using the method of Analytic Hierarchy Process (AHP). For studying the transport plan, the following indicators have been chosen: the transport satisfaction, average number of train stops, average distance travelled, average speed, reliability, availability of service with direct transport and transport capacity. The methodology includes determination of variant schemes of transportation; determination of the number of trains by criterion of minimum direct operating costs for transportation of each variant scheme using linear optimization model; application of AHP method to define the weights of criteria and ranking the variants schemes; and selection of an optimal transport plan according to the criterion of a minimum ratio of normalized direct operating costs to the AHP score. The methodology was experimented in Bulgarian railway network.
Źródło:
Transport Problems; 2018, 13, 1; 37-48
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the running of long-distance trains on non-electrified lines in Poland
Autorzy:
Kamiński, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/27314071.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
railway transport
railway line
diesel locomotive
long distance train
train cancellation
transport kolejowy
linia kolejowa
lokomotywa spalinowa
pociąg dalekobieżny
odwołanie pociągu
Opis:
In recent years, the number of long-distance trains running on non-electrified lines has been increasing in Poland. Unfortunately, trains running on non-electrified lines, unlike those running on the hook of electric locomotives, are very often canceled, especially in the winter. In this research, the analysis of which lines had the most frequent cancellations of trains in 2021 and the reasons for these cancellations were analyzed. The results show that the most common cause of train cancellations was the lack of an efficient locomotive at the starting station. Most often, accessibility problems concern Czech series 754 diesel locomotives. The numbers of canceled trains in February 2021 and 2022 were also compared. The comparison showed that although the situation is far from ideal, it has improved significantly.
Źródło:
Transport Problems; 2023, 18, 1; 19--32
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction and validation for the aerodynamic noise of high-speed train power car
Autorzy:
Jiang, S.
Yang, S.
Wu, D.
Wen, B-Ch.
Powiązania:
https://bibliotekanauki.pl/articles/375504.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
aerodynamic noise
high-speed train
Lighthill-Curle theory
simulation model
online test
hałas aerodynamiczny
pociąg ekspresowy
teoria Lighthilla-Curle
model symulacyjny
test online
Opis:
The aerodynamic noise of high-speed train power car was investigated in this article. The full-scale power car was first modeled, and the external steady flow field was computed by a realizable k-ε turbulence model. The aerodynamic noise sources of the power car surface and the external transient flow field were then calculated by broadband noise source model and large eddy simulation (LES) model, respectively. The static pressures on the train surface were obtained from the results of the transient model. Considering the transient flow field, the far-field aerodynamic noise generated by the power car was finally derived from Lighthill-Curle theory. It was validated by means of on-line tests that have been performed along a real high-speed railway line. Through comparisons between simulations and measurements, it is shown that the simulation model gives reliable aerodynamic noise predictions. We foresee numerous applications for modeling and control of the aerodynamic noise in high-speed train.
Źródło:
Transport Problems; 2018, 13, 2; 91-102
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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