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1
Content available Energy balance comparison of small unmanned vehicle equipped with electric and hybrid propulsion system
100%
Polak F.
Combustion Engines
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2020
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tom R. 59, nr 3
23--27
EN
Article presents comparison of the energetic balance of vehicle powertrain - pure electric vehicle and vehicle equipped with electric hybrid power transmission. Society is more and more often persuaded to buy electric cars as an environmentally friendly solution because they have opinion of ecological vehicles. Electrification in military applications is also widely considered, especially in case of small to medium UGV’s such as wide range of robotic systems introduced to the milatary operations. The article presents the problems of comparing the efficiency and others parameters such as the range of a two presented powertrains. The research was carried out on an small unmanned land platform equipped with a hybrid propulsion system supplied as standard with Diesel power generator and electrically only powered. Energy used for charging of the battery, from tank-to-wheel, was calculated. This also enables to calculate total efficiency of electric and hybrid power transmission. By calculating different capacity of battery and power of generator, it is possible to determine the vehicle range.
2
Przegląd metod lokalizacji źródeł wyładowań niezupełnych w transformatorach energetycznych
63%
Polak F. , Sikorski W.
Przegląd Naukowo-Metodyczny „Edukacja dla Bezpieczeństwa”
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2014
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tom 7
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nr 3(24)
604-619
XX
Defekty wysokonapięciowego układu izolacyjnego, stanowiące źródło wyładowań niezupełnych (wnz), są jedną z głównych przyczyn awarii dużych transformatorów energetycznych. Awarie takie wiążą się z przerwą w pracy systemu elektroenergetycznego, co bezpośrednio przekłada się na przerwę w dostawie energii elektrycznej. Pociąga to za sobą duże straty ekonomiczne, takie jak np. wypłata odszkodowań, kary umowne itp.W pracy poruszono temat lokalizacji wnz występujących w układzie izolacyjnym transformatorów dużych mocy. W głównej części artykułu przedstawiono szeroko stosowane metody lokalizacji wnz, wraz z przedstawieniem ich zalet oraz wad. Głównym celem pracy jest porównanie przedstawionych metod. W części poświęconej dalszym planom badawczym zaprezentowano innowacyjną koncepcję lokalizacji źródeł wnz.
3
Content available Energy balance of a vehicle equipped with hybrid propulsion system fuelled with alternative fuels
51%
Karczewski M. , Szczęch L. , Polak F.
Journal of KONES
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2019
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tom Vol. 26, No. 4
91--96
EN
Article presents the energetic balance of small-unmanned vehicle hybrid power transmission. The vehicle equipped with serial hybrid transmission consisted of electric engines connected to the battery pack and small Diesel power generator. In mentioned construction, battery is used as energy buffer and combustion engine is used more as emergency power supply, and is turned on when battery is depleted. In other condition, power generator can be turned off, without reducing power of transmission parameters, except its range. Vehicles with hybrid drive are very common chosen vehicles by users. More and more often, we also talk about searching for replacement fuels for internal combustion engines, so also for those with hybrid drive. The research was carried out on an unmanned land platform equipped with a hybrid propulsion system supplied as standard with Diesel oil. The article presents the problems of comparing the efficiency of a hybrid vehicle fuelled with Diesel oil, but also with alternative fuels based on kerosene and other components. For test, three types of fuels were used, standard Diesel oil, F-34 and with experimental mixture of Jet A-1 fuel with 10% of 2-ethylhexanol. Energy used for charging of the battery, from tank-to-wheel, was calculated. This also enables to calculate total efficiency of such hybrid power transmission, powered with different fuels.
4
Content available Analysis of electric vehicles efficiency and their influence on environmental pollution
51%
Karczewski M. , Szczęch L. , Polak F. , Brodowski S.
Journal of KONES
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2019
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tom Vol. 26, No. 4
97--104
EN
Electric vehicles are increasingly present on the roads of the whole world. They have the opinion of ecological vehicles, not polluting the environment. Society is more and more often persuaded to buy electric cars as an environmentally friendly solution but is this for sure? Electric cars need quite a lot of electricity accumulated in batteries to drive on a long range. During the charging process, this energy is obtained from the electricity network, to where it is supplied by power plant. Electricity production from renewable sources is a privilege for the rare. However, electric cars are charged from the electricity grid, which in large part energy comes from non-renewable fuels. The efficiency of energy production in power plants and the energy transmission and conversion chain causes that only part of the energy produced in this way goes to the vehicle’s wheels. Although the power plants are equipped with more and more efficient exhaust gas cleaning systems, they do not clean them up to 100%. Sulphur, nitrogen, mercury and heavy metals remain in the exhaust. The article is an attempt to answer the question whether the total emission of toxic components associated with the use of an electric vehicle is not bigger than in a traditional internal combustion engine.
5
Content available Are we ready for electric cars?
51%
Karczewski M. , Szczęch L. , Polak F.
Journal of KONES
|
2019
|
tom Vol. 26, No. 3
69--74
EN
Are we ready for electric cars?
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