Wyniki wyszukiwania - BazTech

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Hybrid locomotives overview of construction solutions

Konarzewski M., Niezgoda T., Stankiewicz M., Szurgott P.

Journal of KONES

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2013

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Vol. 20, No. 1

127--134

EN

Nowadays, transportation becomes a significant source, apart from factories and power plants, of air pollution. Therefore, due to legal restrictions on the emission of noxious gases, other power sources for vehicles are necessary. Some of these power sources allow replacement of the internal combustion engine completely, whereas the other ones only support the engine operation. Hence, a hybrid powertrain – alternative to the drivetrain equipped with an internal combustion engine only – is increasingly being used. The hybrid powertrain was mostly applied in cars and buses but recently it has been also used in railway vehicles such as locomotives and multiple units. The paper presents a shortened and brief overview of construction solutions of selected hybrid locomotives. A list of the applied hybrid drive systems as well as the basic data and properties are provided. The most important variants of vehicles are compared. The presented material allows identification of the development trends in the considered area. The hybrid locomotive usually uses an onboard rechargeable energy storage system, placed between the power source and the traction transmission system connected to the wheelsets. Modification of a classic diesel-electric locomotives is a relatively simple procedure since they have all the components of a series hybrid transmission except the storage battery. Therefore, the existing and operated diesel-electric locomotives can be modified to increase their efficiency and reduce operating costs and emissions.

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A new method of the assessment of rail vehicles guiding behaviour in small-radius curves

Zelenka J., Michalek T.

International Journal of Applied Mechanics and Engineering

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2010

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Vol. 15, no 2

511-519

EN

This paper deals with the assessment of rail vehicles guiding behaviour during passing through small-radius curves. This assessment according to the European standard EN 14363 or the UIC Code 518 is a part of the authorization process in the case of new, reconstructed or modernized railway vehicles. The new version of UIC Code 518:2009 modifies among others the existing definition of the limit value of the quasistatic guiding force. At present, the majority of new vehicles has a problem to keep this limit value of the force acting on the outer wheel of the guiding wheelset in small and very small-radius curves. For purposes of the assessment of the interaction between vehicles and track, this Code defines a new quantity - so-called quasistatic loading force, as well. The assessment of the guiding behaviour of the new four-axled diesel-electric locomotive Class 744.0 CZ LOKO by simulations performed at the Detached Branch of the Jan Perner Transport Faculty in Česká Třebová is demonstrated in this paper.

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Application of supercapacitors to recuperate energy in diesel-electric locomotives

Kozłowski M.

Archives of Electrical Engineering

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2005

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Vol. 54, nr 2

205-224

EN

Efficiency of energy recuperation in a hybrid diesel-electric locomotive equipped with a supercapacitor used for energy-storage has been analysed and the analysis results have been presented. Pulse mode of the capacitor charge/discharge has been considered. It has been proved that the process efficiency is closely related to voltage levels of the motor and the supercapacitor (initial and final voltage of charge discharge) as well as to parameters of the devices: rated power of the set and capacity of the supercapacitor Example simulation tests for a supercapacitor applied to modernize a diesel locomotive SP42 have been presented. The determined supercapacitor capacities make possible to recuperate braking energy in most of the running conditions predicted for that locomotive. The accepted voltage levels of charge/discharge make possible to obtain 70 energy efficiency in the processes of energy storage or recovery and savings of ca 20 kg of diesel fuel per one duty cycle.

PL

Przedstawiono wyniki analizy sprawności rekuperacji energii w lokomotywie hybrydowej spalinowo--elektrycznej z superkondensatorem wykorzystywanym jako zasobnik energii. Uwzględniono impulsowy sposób podładowania, rozładowania kondensatora. Wykazano, że sprawności procesu są ściśle związane z poziomami napięć silnika i superkondensatora (początkowym i końcowym napięciem pod/- i roz -/ładowania) a także z parametrami urządzeń: mocą znamionową zespołu i pojemnością superkondensatora. Przedstawiono przykłady badań symulacyjnych dla przypadku zastosowania superkondensatora do modernizacji lokomotywy spalinowej SP42. Wyznaczone pojemności superkondensatora umożliwiają rekuperację energii hamowania w większości przewidywanych dla tej lokomotywy warunków ruchu. Przyjęte poziomy napięć pod/- roz -/ładowania umożliwiają osiągnięcie 70% sprawności energetycznej procesów magazynowania lub zwrotu energii i oszczędności ok. 20 kg oleju napędowego na cykl pracy.