Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 8

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
EN
In Poland, due to the increase in investments made by railways in recent years, and thus the increase in the replacement value of transport infrastructure, the need for expenditure on infrastructure maintenance will increase in the next 30 years, or the development of the developed transport network will degrade. As part of the overall discipline of resource management, subdiscipline has emerged - infrastructure asset management. As part of the management of railway transport infrastructure, the demand for cheaper maintenance costs will grow. The cost reduction of infrastructure maintenance is possible through meticulous assessment of its condition, rational selection of locations and scope of repairs at the assumed risk level, as well as at the stage of preparation of new construction or modernization projects taking into account aspects of later maintenance. For some time, we have been observing the accumulation of knowledge (methods, programs, procedures) in the country and abroad enabling optimization of infrastructure condition assessment and programming of its maintenance. The implementation of these solutions may result in a more rational use of funds for infrastructure maintenance and not disturb its smooth functioning in operation. The article discusses aspects that should be considered in the design process of railway infrastructure. Particular attention was paid to the durability of steel components of the railway superstructure, maintenance costs as well as aspects related to the capacity of the track node. An example of dependence of selected values of radial arcs depending on their durability and maintenance costs was presented. It was proposed to change the track layout at the Warszawa Srodmiescie passenger stop planned for reconstruction. Calculations of kinematic parameters for various configurations of railway turnouts were performed. Also, calculations of the capacity for the existing track system solution as well as the proposed track system after reconstruction of the analysed Warszawa Srodmiescie railway station were also carried out.
EN
Intensive pursuit in the introduction of automatic train driving systems, both with and without the driver in the cabin, can be observed around the world. Implementation of such a system allows for an increase in both the safety level of traffic and capacity of railway lines and consequently, an increase in the running frequency of these trains, which is extremely important in large urban agglomerations. One type of automatic train system is the CBTC class, in which a wireless network is used for data transmission. An important issue in the systems of this class is the problem of transferring information from the track to the train about the possibility and method of driving. This article describes the possible ways of sending information from the track to the train. The system of information transmission from track to trains (SPITP) was defined and discussed. The general characteristics of the CBTC class systems were presented. In Poland, a scientific project which aimed at developing the CBTC class system was recently undertaken. It is called rmCBTC and is being prepared as part of a project carried out by the Rail-Mil Computers Sp. z o. o. from Warsaw and the Faculty of Transport of the Warsaw University of Technology, co-financed by the National Center for Research and Development from the European Union Funds. This article presents the assumptions of the designed system and discusses the scope of data that is necessary in the subsystem of information transfer from the track to the train with the rmCBTC system.
PL
W artykule opisano wyniki badań w zakresie identyfikacji struktury baz danych o infrastrukturze drogowej oraz infrastrukturze kolejowej przygotowanej dla systemu EPLOS (Europejski Portal Usług Logistycznych). EPLOS jest narzędziem wspomagającym planowanie procesów logistycznych oraz ich realizację poprzez udostępnianie w jednym miejscu aktualnych i zweryfikowanych danych potrzebnych uczestnikom rynku TSL. System ten jest tworzony w ramach inicjatywy EUREKA. W kolejnych częściach artykułu opisano: rolę baz danych w funkcjonowaniu aplikacji dedykowanych logistyce oraz wyniki badań w zakresie identyfikacji potrzeb uczestników rynku TSL odnośnie baz danych systemu EPLOS o infrastrukturze liniowej transportu, jak i zakres danych o sieci drogowej oraz zakres danych o sieci kolejowej dla systemu EPLOS.
EN
The article describes the results of research in the field of identifying the structure of databases on road infrastructure and railway infrastructure prepared for the EPLOS system (European Portal of Logistics Services). EPLOS is a tool that supports the planning of logistics processes and their implementation by providing in one place the current and verified data necessary for TSL market participants. This system is created as part of the EUREKA initiative. The following parts of the article describe: the role of databases in the application of logistics-dedicated applications and research results on identifying the needs of TSL market participants regarding EPLOS system databases with linear transport infrastructure, as well as the scope of road network data, the scope of railway network data and the integrated concept databases for the EPLOS system.
EN
This article focuses on the application of the queueing theory for the analysis of transport processes with regard to rail traffic. Selected aspects of queueing theory application for the analysis and rail traffic flow assessment are presented. A literature review regarding process modelling in rail transport using mass service theory models was performed. In order to study rail traffic flow, the application Java Modelling Tools- JSIM graph was used. The train movement process was analysed with regard to the traffic flow. The study was conducted on the basis of selected stretches of railway lines, numbers 2 (central long-distance in Warsaw) and 448 (central suburban in Warsaw).
EN
The aim of the article is to present a method concerning the problem of the construction of timetable from the point of view of the assignment of platform edges and stabling tracks. Taking into account these two issues in the method is extremely important from the point of view of the fluency of railway traffic, as well as minimizing railway undertaking costs related to access to the infrastructure offered by the manager in terms of occupying the platform edge above the set time. The paper describes the issues of allocating platform edges and stabling tracks in operating offices, with particular consideration of the costs related to this. The formulation of the problem of the train timetable construction was presented, including the allocation of edges and stabling tracks in a mathematical manner. In the model those parts were specified that are relevant to the research problem considered in the article. In addition, the algorithm of the construction method with the use of a block diagram was discussed.
PL
Dynamiczny rozwój transportu jest istotnym czynnikiem rozwoju gospodarczego i znaczącym źródłem uciążliwości do- tyczących głównie negatywnego wpływu na środowisko. Jedną z metod pozwalających na poprawę sytuacji w tym obszarze jest racjonalne planowanie rozwoju systemu transportowego. W artykule omówiono problematykę modelowania rozwoju systemu transportowego. Scharakteryzowano problemy środowiskowe, które są brane pod uwagę przy modelowaniu rozwoju systemu transportowego. Ponadto omówiono koncepcję modelu rozwoju proekologicznego systemu transportowego, będącego rozwinięciem modelu proekologicznego systemu stanowiącego efekt prac nad projektem EMITRANSYS. Wskazano jego elementy oraz zastosowanie.
EN
Dynamic development of transport is important factor of economic development and significant source of nuisance regarding mainly negative impact on environment. One of methods to improve situation is rational planning of transport system development. Article discusses problem of transport system development modelling. Environmental problems, which are taken into account were characterized. Concept of model for pro-ecological transport system development, which is an extension of model constituting effect of work on EMITRANSYS project, was discussed. Its elements and application were indicated.
7
Content available remote Wybrane aspekty modelowania procesów magazynowych
PL
Modelowanie obiektów magazynowych, tj. badanie ich właściwości za pomocą uproszczonego odpowiednika – modelu, jest jednym z możliwych sposobów dążenia do poprawy jakości i ceny oferowanych usług. W artykule przedstawiono cele modelowania obiektów magazynowych oraz wymagania stawiane modelom matematycznym je odwzorowującym. Kolejny punkt poświęcono modelowaniu procesów magazynowych. Zaprezentowano procedurę modelowania procesów magazynowych. Przedstawiono także koncepcję modelu optymalizacji procesów magazynowych. Proponowany model matematyczny odzwierciedla strukturę fizyczną, funkcjonalną i potencjał obsługowy magazynu dowolnego typu oraz umożliwia odwzorowanie różnych procesów magazynowych i strategii ich realizacji.
EN
Modelling of storage facilities is one of possible ways to improve the quality and price of offered services. The article presents goals of modelling warehouse objects and the requirements for mathematical models that map them. A procedure for modelling warehouse processes is presented. The concept of storage optimization model was also presented. The proposed mathematical model reflects the physical, functional and service potential of any type of warehouse, and enables mapping of various warehouse processes and strategies for their implementation.
EN
The transport system has a direct impact on the economic and socio-economic situation of each country. Planning its development is an important element of policy. Bearing in mind the importance and complexity of this issue, it should be considered using both quantitative methods and mathematical models, as well as advanced simulation tools for modelling transport. The article presents a proposal for an approach to simulation tests of the different transport system in the aspect of the emission of harmful exhaust gas compounds from road transport. The tool for analysing and assessing the functioning of existing or designed systems is a model in which the properties of the real system, which are important from the point of view of the research objective, should be mapped. The Model of Proecological Transport System (MEST) was presented formally as an ordered four. Also elements of optimization taks shaping of proecological transport system in form of datas, decision variables, conditions and goal function were presented. An example of tests on simulation model was shown.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.