Wyniki wyszukiwania - BazTech

1

Selected issues of air pollution emissions in intermodal transport

Pryciński Piotr, Jachimowski Roland, Wawryszczuk Róża, Gołębiowski Piotr

Prace Naukowe Politechniki Warszawskiej. Transport

|

2024

|

z. 138

47--61

EN

The authors analyzed air pollution emissions during intermodal and road transport. The research question was an attempt to determine which type of transport is characterized by lower emissions, assuming that intermodal transport is carried out by rail, using two locomotives: diesel and electric. The research method used the results of actual tests determining the emissions of diesel locomotives, the emission index method determining the approximate value of air pollutant emissions generated by road vehicles, and data showing the volume of air pollutant emissions resulting from the consumption of electricity, which was used by electric locomotives, based on statistical data from The National Centre for Emissions Management (KOBiZE).

2

Assumptions for the mathematical model investigating the effect of railway line route parameters on the average speed of railway vehicles

Krzykawski Martin, Burdzik Rafał, Gołębiowski Piotr

Prace Naukowe Politechniki Warszawskiej. Transport

|

2024

|

z. 139

5--18

EN

Rail transport is the most efficient alternative to road transport. The popularity of this branch is constantly growing. As a consequence, it is noticed that key terminals, railway routes and HUB stations are constantly being overloaded, resulting in a reduction in the available capacity. This necessitates the passage of higher priority trains (mainly passenger trains), which requires the introduction of additional stops for freight trains and consequently reduces commercial speeds. A railway line is characterized, m.in, by parameters such as: electrification, maximum speed, railway line class, track width, etc. Each of these parameters can have an impact on the average speed of rail vehicles in rail transport. An additional factor determining speed is the capacity of railway lines. Due to the lower capacity and the consequent low average commercial speed, alternative routes for trains are being sought. The aim of the article is to analyze the assumptions for the mathematical model of the influence of technical parameters of routes and capacity of railway lines on the average speed of rail vehicles. In order to achieve this goal, the article is divided into five sections. The first section is an introduction to the article. The second section describes theoretical issues related to modelling in transport. The third section describes the issues of mathematical modeling using graph theory. The practical application of graph theory on the selected example is described in the fourth section. A summary of the article and preliminary research is presented in the last section.

PL

Transport kolejowy stanowi najefektywniejszą alternatywę dla transportu samochodowego. Popularność tej gałęzi ciągle rośnie. W konsekwencji zauważa się, że kluczowe terminale, szlaki kolejowe i stacje HUBowe są ciągle dociążane, w efekcie czego zmniejsza się dostępna na nich przepustowość. Wymusza to konieczność przepuszczania pociągów o wyższym priorytecie (głównie pociągów pasażerskich), co wymaga wprowadzenia dodatkowych postojów dla pociągów towarowych i w konsekwencji powoduje zmniejszanie prędkości handlowej. Linia kolejowa charakteryzowana jest m.in. przez takie parametry jak: elektryfikacja, prędkość maksymalna, klasa linii kolejowej, szerokość toru itd. Każdy z tych parametrów może mieć wpływ na średnią prędkość pojazdów szynowych w transporcie kolejowym. Dodatkowym czynnikiem determinującym prędkość jest przepustowość linii kolejowych. W związku z mniejszą przepustowością oraz w konsekwencji niską średnią prędkością handlową poszukuje się alternatywnych tras dla pociągów. Celem badań przedstawionych w niniejszym artykule jest analiza założeń do modelu matematycznego definiującego wpływ parametrów trasy linii kolejowej na średnią prędkość pojazdów szynowych w transporcie kolejowym. Aby zrealizować tak postawiony cel artykuł podzielono na pięć sekcji. Sekcja pierwsza stanowi wprowadzenie do artykułu. W sekcji drugiej opisano zagadnienia teoretyczne w odniesieniu do problematyki modelowania w transporcie. Sekcja trzecia opisuje zagadnienia modelowania matematycznego z wykorzystaniem teorii grafów. Praktyczne zastosowanie teorii grafów na wybranym przykładzie opisano w sekcji czwartej. Podsumowanie artykułu i wstępnych badań przedstawiono w ostatniej sekcji.

3

Evaluation of the technological process of wagon processing at shunting stations using the simulation model

Szczepański Emilian, Gołębiowski Piotr, Kondracka Barbara

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2023

|

z. 120

249--267

EN

Shunting stations play an essential role in ensuring the proper functioning of the railway transport system. The proper organisation of their work allows trains to be dispatched on time and compensates for delays in other areas of the railway network. This paper presents a method for evaluating the technological process of wagon processing at shunting stations based on the author's formulation of evaluation measures and using a simulation model developed in Flexsim. A variant computational example was developed to verify it and demonstrate its capabilities. The method has many applications in assisting decision-makers in organising shunting station operations, adapting the shunting station layout to the tasks or identifying bottlenecks.

4

Risk assessment in railway rolling stock planning

Gołębiowski Piotr, Góra Ignacy, Bolzhelarskyi Yaroslav

Archives of Transport

|

2023

|

Vol. 65, iss. 1

137--154

EN

Rolling stock planning is one of the steps in the traffic planning process considered from the railway undertaking's point of view. It is directly related to the efficiency of rolling stock utilisation, which should be ensured at the highest possible level in the case of rail transport. The planning work stage is subject to certain risks (threats and opportunities), which, if they materialise, will impact it. It, therefore, makes sense to carry out analyses that can anticipate specific events in good time and introduce appropriate countermeasures in advance. This article aims to conduct a risk assessment process concerning rolling stock planning. It was assumed that the considerations were carried out based on the M_o_R (Management of Risk) methodology. Based on this methodology, risk identification and risk analysis (estimation of risk impact) were carried out. Risk assessment was carried out using the Monte Carlo simulation method. The work identified sixteen risks that represent threats. The principle of risk description was used to identify risks. It requires indicating for each risk the reason for its occurrence and the effect it may have. As a part of risk estimation, variables were selected to assess each risk's impact on the objectives of the stage. Publicly available statistical data were used to define the variables. The variables were expressed in monetary units. The work identified five variables describing impact, which were assigned to the individual risks. As a triangular probability distribution was used for the variability of impact description, the variable's minimum, most likely, and maximum value was identified. A risk assessment was carried out for only two impact description variables (for those variables used to describe the impact of the most significant number of risks). For each variable, statistical parameters were indicated and analysed. The resulting value of the variable describing the impact was then read out for each percentile, and the expected value of the risk was calculated. A detailed risk assessment was made for the lower, middle and upper quartiles. A histogram of the incidence of each variable value was presented, and an assessment was made.

5

Risk assessment in railway traffic planning - assumptions for the method

Gołębiowski Piotr

Prace Naukowe Politechniki Warszawskiej. Transport

|

2022

|

z. 134

109--123

EN

Every activity, including within the railway system, is subject to risk, i.e., the possibility of uncertain phenomena that may affect it (both positively and negatively). One of the operational subsystems of the Union Railway System is railway traffic. It consists of four processes - the second is traffic planning. This process is also subject to risk. As it directly relates to traffic safety, conducting research and analyzing the risks involved makes sense. This article aims to develop the assumptions for a risk assessment method in railway traffic planning. This method, once created, will be used to carry out a risk assessment of the indicated process from two points of view: the railway undertaking and the infrastructure manager. As a result of the considerations, it was assumed that risk identification would be performed using the risk description principle from the M_o_R methodology. The risk estimation will be adapted to use a probabilistic risk assessment model. This assessment will be performed using the Monte Carlo simulation method, which is strongly recommended for use by the Office of Railway Transport (the national railway safety body).

PL

Każda działalność, także w obrębie systemu kolejowego, obarczona jest ryzykiem, czyli możliwością wystąpienia niepewnych zjawisk, które mogą mieć na nią wpływ (zarówno pozytywny jak i negatywny). Jednym z podsystemów eksploatacyjnych systemu kolei Unii jest ruch kolejowy. Składa się on z czterech procesów – drugi to planowanie ruchu. Proces ten także jest obarczony ryzykiem. Ze względu na to, że ma on bezpośredni związek z bezpieczeństwem ruchu, to zasadnym jest prowadzenie badań i analiz nad ryzykiem z nim związanym. Celem artykułu jest opracowanie założeń do metody oceny ryzyka w planowaniu ruchu kolejowego. Metoda ta, po jej opracowaniu, zostanie wykorzystana do przeprowadzenia oceny ryzyka wskazanego procesu z dwóch punktów widzenia: przewoźnika kolejowego oraz zarządcy infrastruktury. W wyniku przeprowadzonych rozważań przyjęto, że identyfikacja ryzyka zostanie dokonana z wykorzystaniem zasady opisu ryzyka z metodyki M_o_R. Szacowanie ryzyka zostanie dostosowane do wykorzystania probabilistycznego modelu oceny ryzyka. Ocena ta zostanie wykonana przy pomocy metody symulacyjnej Monte Carlo, która jest jedną ze zdecydowanie zalecanych do wykorzystania przez Urząd Transportu Kolejowego (krajowy organ bezpieczeństwa ruchu kolejowego).

6

Study of the two-rotor electric motor of a drive of vehicle drive wheels

Sergienko Nikolay, Kuznetsov Valeriy, Liubarskyi Borys, Pastushchina Mariia, Gołębiowski Piotr, Tkaczyk Sławomir

Archives of Transport

|

2021

|

Vol. 60, iss. 4

245--257

EN

In recent years, electric and hybrid vehicles have taken more and more attention due to their apparent advantages in saving fuel resources and reducing harmful emissions into the environment. Even though electric vehicles can solve the ecological problem, their operation is faced with a number of inconveniences associated with a limited driving distance from a single charge due to limited storage of energy from an independent power source and a lack of the required service and repair infrastructure. In hybrid and electric vehicles one of the main parameters is the curb weight, which affects energy consumption, vehicle speed, stability, controllability and maneuverability. In this regard, leading car manufacturers use parts with a low specific weight (non-metallic, aluminum alloys, etc.) in the design and also exclude some units from the design. Due to these technical solutions, the vehicle's operating is improved. One of the groups of parameters to be defined when designing a new electric vehicle is the parameters relating to the electric motor. The purpose of the article is determination of the mechanical characteristics of a two-rotor electric motor during magnetic flux control and assessment of the possibility of organizing the drive of the drive wheels of the vehicle. The electric motor has two mechanically independent outputs. For the study, an electrical equivalent diagram has been developed for the given two-rotor electric motor. A simulation model of the equivalent diagram has been built. Simulating the interaction processes of the rotors with the stator made it possible to obtain data for building the mechanical characteristics for each output of the electric motor. Analysis and processing of the mechanical characteristics data of the electric motors showed the conformity and the range of changes in the torque on each of the rotors when changing their slip and revolution, which are required when building algorithms for the operation of electric motor control systems as part of drives for various purposes. Analysis of the simulation results made it possible to assess the possibility of using the considered two-rotor electric motor for the drive of drive wheels in an electric and hybrid wheeled vehicle.

7

Decision problems in designing database architecture for the assessment of logistics services

Izdebski Mariusz, Jacyna-Gołda Ilona, Gołębiowski Piotr, Gołda Paweł, Pyza Dariusz, Żak Jolanta

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2020

|

z. 108

53--71

EN

This paper presents decision problems which occur in designing database architecture for the assessment of logistics services. In the work, it was emphasized that the key stages in database design is to define a database model comprising a set of rules that characterize the structure of data in the database and a list of operations that can be performed on the data entered into the database. Research presented in the article is conducted as part of the project on the European Portal of Logistics Services (EPLOS) implemented on the basis of an agreement with the National Center for Research and Development under the EUREKA program. As part of the research carried out as part of the project, the principles of functioning of distributed architecture were developed and evaluated for the services offered by carriers or logistics operators operating on the international market. These include operators providing air services, international road, intermodal, sea transports, etc. The article indicates that the purpose of the database responsible for processing information in cargo intermodal connections is not only to collect input data on aviation and road infrastructure, but also to save the results generated by computational modules. At work, the modular database structure for assessing logistics services consisting of among others from dynamic data module, archive module, data entry module, optimization algorithm calibration module was proposed. Catalog structure and rules for supplying the database with data on the example of a railway operator were presented in detail.

8

Preliminary study of shaping the railway track geometry in terms of their maintenance costs and capacity

Gołębiowski Piotr, Kukulski Jacek

Archives of Transport

|

2020

|

Vol. 53, iss. 1

115--128

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.

9

Selected aspects of the selection of data sent to the vehicle in automatic rail vehicle driving systems

Kukulski Jacek, Gołębiowski Piotr, Pyza Dariusz, Jachimowski Roland, Wychowański Wawrzyniec

Zeszyty Naukowe. Transport / Politechnika Śląska

|

2019

|

z. 103

43--52

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.

10

Struktura baz danych sytemu EPLOS o infrastrukturze transportu drogowego oraz kolejowego

Wasiak Mariusz, Szczepański Emilian, Jachimowski Roland, Gołębiowski Piotr, Leleń Paweł

Prace Naukowe Politechniki Warszawskiej. Transport

|

2019

|

z. 125

191--204

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.

11

The Use of the Queueing Theory for the Analysis of Transport Processes

Jacyna Marianna, Żak Jolanta, Gołębiowski Piotr

Logistics and Transport

|

2019

|

Vol. 41, No. 1

101--111

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).

12

Selected Aspects of the Train Timetable Construction of Passenger Trains with the Consideration of Platform Edges and Stabling Tracks Allocation Problem

Gołębiowski Piotr

Logistics and Transport

|

2019

|

Vol. 41, No. 1

91--100

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.

13

Wybrane aspekty modelowania rozwoju systemu transportowego z uwzględnieniem aspektu środowiskowego

Żak Jolanta, Gołębiowski Piotr, Jachimowski Roland

Gospodarka Materiałowa i Logistyka

|

2019

|

nr 5

2--7

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.

14

Wybrane aspekty modelowania procesów magazynowych

Żak Justyna, Gołębiowski Piotr, Kłodawski Michał

Gospodarka Materiałowa i Logistyka

|

2019

|

nr 5

745--754, CD

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.

15

The EMITRANSYS model and the possibilities of its application for the analysis of the development of sustainable transport systems

Jacyna Marianna, Żak Jolanta, Gołębiowski Piotr

Combustion Engines

|

2019

|

R. 58, nr 4

243--248

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.