Wyniki wyszukiwania - BazTech

1

Integrated research of multi-purpose stanchion baskets for transporting timber and containers

Bizoń Krzysztof, Chmielewska Aleksandra, Chudzikiewicz Andrzej, Sładkowski Aleksander, Stelmach Anna

Transport Problems

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2023

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T. 18, z. 4

73--86

EN

Analyses of cargo transport in 2021 show that despite the increased volume of cargo transported by all types of transport compared to 2020, road transport is still dominant compared to rail transport. Therefore, all actions aimed at improving these unfavorable relations (rail transport vs. road transport) in transport, particularly cargo transport, should be considered purposeful and justified. One such activity is the ongoing work on the design and construction of freight wagons for specialized transport. Unlike universal wagons, specialized wagons are characterized by a limited ability to transport a wide range of material groups. An example is the transport of timber. However, the development of new transport technologies, and above all, technical and organizational progress, force the organizers of these transport modes to look for new logistic and rolling stock solutions. The aforementioned transport of timber is an example of this. The transport of wood does not constitute a large volume of transport, but taking into account its transport issues (transport with large truck tractors, high axle loads, and high risks for other road users), it is a classic example of the fact that it should not be carried out by road over long distances. Therefore, all actions aimed at reducing these issues and improving efficiency by using rail transport are desirable and even necessary. The article presents an innovative design solution in the form of a stanchion basket installed on flat wagons, allowing the use of standard wagons of this type to transport both containers and timber as well as loads such as beams and pipes. Such a solution will allow the use of empty runs of these wagons after unloading wood at the destination station for further transport of containers and vice versa. The considerations described in the article show the research process at the construction stage and testing the prototype of the built basket and the wagon with the stanchion basket structure placed on it.

2

Asymmetric threats in terms of safety of railway systems

Chudzikiewicz Andrzej, Krzyszkowski Andrzej, Stelmach Anna

Transport Problems

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2021

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T. 16, z. 3

131--140

EN

This article deals with the problem of new threats that appear in areas that have not been affected by them so far. The considerations concern asymmetric threats and the railway system. The analysis of this issue was carried out on the basis of general information on the problem of asymmetric threats and the knowledge of the railway system, its operation and identified threats that can be attributed to the characteristics of asymmetric threats. The aim of the article is to draw attention to new phenomena that are beginning to affect transport on a global basis, including rail transport.

3

Modeling and simulation of a control system of wheels of wheelset

Chudzikiewicz Andrzej, Gerlici Juraj, Sowińska Magdalena, Stelmach Anna, Wawrzyński Wojciech

Archives of Transport

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2020

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Vol. 55, iss. 3

73--83

EN

Modern light rail vehicles, such as a tram or rail bus, due to the need to provide mobility for the elderly or disabled people and the requirements of operators operating passenger rail transport or transport in urban areas must have a 100% low floor. Structurally, this is associated with the use of wheelset with independently rotating wheels (IRW) in such vehicles. It is also possible to use a bogie structure without the use of a wheelset axle by mounting the wheels directly in the side parts of the bogie frame. This construction is more complex and will not be discussed in this article. Bearing in mind the dynamic behavior of such vehicles during operation (lateral stability, profile wear) in various driving conditions (curve traffic, crossovers) and taking into account operating costs, it becomes necessary to install wheel rotation control systems to maintain center movement mass of the wheelset around the centerline of the track. The subject of the article will be considerations on modeling and simulation of rail vehicle bogie motion with IRW sets including the wheel control system. Nominal and mathematical models of the analyzed vehicle will be presented, as well as a controlled strategy based on the comparison of the angular velocities of the wheels of the wheelset A review of works on solutions of such systems will be presented, and a control concept will be proposed. The summary contains conclusions regarding the possibility of practical use of the proposed method of steering wheels of a wheelset in the case of independently rotating wheels.

4

Powłoki samosmarowne kół zestawów kołowych w aspekcie właściwości dynamicznych pojazdu szynowego

Chudzikiewicz Andrzej, Melnik Rafał, Góra Ignacy

Prace Naukowe Politechniki Warszawskiej. Transport

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2019

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z. 124

19--30

PL

Eksploatacja pojazdów szynowych, zwłaszcza w prowadzeniu przewozów towarowych, na liniach z łukami o małym promieniu skutkuje przyspieszonym procesem zużycia profili kół oraz szyn na łukach. Powoduje to zwiększone koszty eksploatacji oraz może być przyczyną wykolejeń na takich liniach. Jednym ze sposobów zmniejszenia tych negatywnych skutków oraz poprawy współpracy koła z szyną na łukach o małych promieniach jest pokrywanie powierzchni obrzeży kół zestawów kołowych, pojazdów eksploatowanych w takich warunkach, powłokami z materiałów posiadających właściwości samosmarowe. Pokrycie powierzchni koła w części obrzeża odpowiednią powłoką powoduje zmniejszenie współczynnika tarcia w przypadku współpracy koła z szyną na łuku, kiedy to ta współpraca odbywa się pomiędzy obrzeżem koła i krawędzią główki szyny. Pojawia się jednak pytanie odnośnie wpływu powłoki samosmarownej na bezpieczeństwo biegu pojazdu. W artykule przedstawiono rezultaty symulacyjnych analiz zachowania dynamicznego dwuosiowego wagonu towarowego typu węglarka z zamodelowaną powłoką samosmarowną oraz jej wpływ na zużycie kół.

EN

Exploitation of railway vehicles, especially in the case of goods transport, on lines with small-radius curves, results in accelerated wear of wheel profiles and rails in curves. This results in increased operating costs and can lead to derailments on such the lines. One of the ways to reduce these negative effects and to improve the wheel-rail interaction in sharp curves is to cover the surface of the wheel flange with coatings of materials with self-lubricating properties. Covering the wheel flange surface with a suitable coating reduces friction coefficient in case of flange-rail head interaction. However, there is a question about the effect of the self-lubricating layer on the safety of the vehicle. The paper presents the results of simulation analysis of dynamic behavior of a two-axial coal wagon with a modeled self-lubricating coating and its effect on wheel wear.

5

Innovative solutions in the scope of railway rolling stock in research projects

Chudzikiewicz Andrzej, Stelmach Anna, Wawrzyński Wojciech

Pojazdy Szynowe

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2019

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Nr 4

1--10

EN

In Poland, the basic document introducing, in a formal way, the concept of innovation into the economic cycle was the Operational Program Innovative Economy 2007-2013 (OP IE) - a government document adopted by the Council of Ministers on 19 December 2006. This document described the state of the Polish economy and the state of Polish science in terms of innovation and competitiveness. As usual in such cases, the administrative structures were initially developed by introducing the concepts such as: Managing Institution, Intermediate Institutions and Implementing Institutions, and a large-scale information campaign was started as if the projects in Poland had not been implemented so far, which had not been completed with implementation in practice of a new or significantly improved product, service or process. The paper will present some projects carried out at the Faculty of Transport of the Warsaw University of Technology before 2007., that is before the OP IE, which projects can be included in the innovative projects according to the adopted definition.

PL

W Polsce podstawowym dokumentem wprowadzającym, w sposób formalny, pojęcie innowacyjności do obiegu gospodarczego był Program Operacyjny Innowacyjna Gospodarka 2007-2013 (PO IG) – rządowy dokument przyjęty przez Radę Ministrów 19 grudnia 2006 roku. Dokument ten opisywał stan polskiej gospodarki oraz stan polskiej nauki pod kątem innowacyjności i konkurencyjności. Jak zwykle w takich przypadkach, na początek rozwinięto struktury administracyjne wprowadzając takie pojęcia jak: Instytucja Zarządzająca, Instytucje pośredniczące i Instytucje Wdrażające oraz rozpoczęto szeroko zakrojoną kampanię informacyjną tak, jak gdyby do tej pory w Polsce nie realizowano projektów, które nie zostały zakończone wdrożeniem w praktyce gospodarczej nowego lub znacząco udoskonalonego produktu, usługi lub procesu. W referacie zostaną przedstawione niektóre projekty zrealizowane na Wydziale Transportu Politechniki Warszawskiej przed 2007 rokiem, czyli przed uruchomieniem PO IG, które to projekty zgodnie z przyjętą definicją zaliczyć można do projektów innowacyjnych.

6

Selection of signal registration points in the monitoring process and diagnosing the condition of the rail vehicle

Chudzikiewicz Andrzej, Stelmach Anna, Wawrzyński Wojciech

Journal of civil engineering and transport

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2019

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Vol. 1

7--13

EN

The article discusses the process of selecting points on a rail vehicle in which sensors recording signals will be located, with a view to their later use in the process of monitoring the condition of the vehicle and in particular elements of the first and second degree suspension system. The number of such points and their location is significant considering the complexity of the monitoring system and thus the costs of its construction and subsequent operation, as well as the possibility of using registered signals in the process of diagnosing the technical condition of the vehicle, bearing in mind the functioning of such a system in online mode.

PL

W artykule omówiony został proces wyboru punktów na pojeździe szynowym, w których ulokowane będą czujniki rejestrujące sygnały, mając na uwadze późniejsze ich wykorzystanie w procesie monitorowanie stanu pojazdu a w szczególności elementów układu podatnego I i II stopnia usprężynowania. Liczba takich punktów oraz ich rozmieszczenie ma istotne znaczenie biorąc pod uwagę złożoność systemu monitorowania a tym samym koszty jego budowy i późniejszej eksploatacji a także możliwość wykorzystania zarejestrowanych sygnałów w procesie diagnozowania stanu technicznego pojazdu mając na uwadze funkcjonowanie takiego systemu w trybie on-line.