Wyniki wyszukiwania - BazTech

1

Driving protocols: the possibility of using routing protocols in autonomous transport

Wróbel Radosław, Sroka Zbigniew, Sierzputowski Gustaw, Dimitrov Radostin, Mihaylov Veselin, Ivanov Daniel

Combustion Engines

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2024

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R. 63, nr 1

3--9

EN

Removing the human factor from transport (in the direct sense) is still a plan, reaching into the future. However, this plan does not require so much imagination - autonomous vehicles can already be found on the roads. Currently, they are not only autonomous but also independent, i.e. decisions about traffic parameters are made in the vehicle. In the future, with more autonomous vehicles, there will be a need to connect them with a communication network, which will eliminate a number of telematic problems. It remains an open question how to make this network? Is it based on the modern Internet network? What and which data will be necessary to achieve the “right relations” between autonomous vehicles (hosts of network)? The article presents one aspect of the mentioned problem; the amount of data generated by an autonomous vehicle is presented in light of the processing capabilities of modern ICT systems.

2

Impact of water content in fuel for smoke opacity

Haller Piotr, Haller Agata, Kaźmierczak Andrzej, Matla Jędrzej, Sroka Zbigniew, Wróbel Radosław

Combustion Engines

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2023

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R. 62, nr 4

123--127

EN

The development of internal combustion engines is focused at solving problems like: fulfilment with increasingly stringent requirements regarding exhaust emissions and elimination of threats to the natural environment. The subject of this thesis is to assess the impact of supplying a compression-ignition engine with hydrocarbon mixtures and to examine the impact of water on external parameters of the engine, such as smoke opacity. The main tests were carried out on a 4-cylinder VW 1.9 TDI internal combustion engine at a constant engine crankshaft speed of 3000 rpm and a variable load of 0, 30, 60, 90, 120, 150 and 180 Nm. The tests were carried out using an innovative mixture of hydrated fusel oils, ethyl alcohol and ionic and/or non-ionic emulsifiers, from which was made of microemulsions with a water content in diesel oil of 5, 10, 15, 20 and 25%. The tests carried out showed a beneficial effect of the water content in the diesel oil on the reduction of the average value of smoke opacity, which systematically decreases with the increase in the percentage of water in the diesel oil.

3

Fuel with a higher content of bio components in greenhouse effect aspects

Andrych-Zalewska Monika, Sitnik Lech, Sroka Zbigniew, Mihaylov Veselin

Combustion Engines

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2023

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R. 62, nr 1

36--42

EN

Transport is an energy-intensive sector of the economy and it is important where energy comes from and how it is used - now and in the future. The presented research results seem to encourage further work, despite the fact that the work had the character of basic research. The results were achieved in idealized conditions by the fact that the internal combustion engine was tested in static conditions on the test bench and the fuels contained components with strictly defined parameters. These conditions are different from everyday life. However, the obtained results seem to be valuable as they lead to conclusions regarding biofuels, and these conclusions are not directly formulated and published in the literature on the subject. The general conclusion from the research carried out is that the introduction of the so-called biofuels can contribute not to the reduction of CO2 emissions, but to its faster balancing in the environment. This balancing can be achieved but at the cost of increased fuel consumption. This increase in fuel consumption would probably not occur if the "bio" components in the fuel were synthetic hydrocarbons obtained from biomass. However, proving it requires wider studies, including LCA. Data for this LCA, especially about a fuel consumption, may be coming from long term operation of vehicles.

4

Application of seepage time curve in the assessment of flood embankment tightness

Sroka Zbigniew

Journal of Water and Land Development

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2022

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no. 54

154--159

EN

Flood embankments have played an important role in flood protection systems for centuries. Tightness evaluation of water structures should result in determining whether floods may cause seepage incidents, consequently leading to their damage or even destruction. It is assumed that the time of water passage from the river to the protected area under steady-state conditions can be a good indicator of the embankment resistance to long-term water rise. The curve of water passage times shows the values obtained at different ordinates of the dammed water and can be regarded as a characteristic parameter of flood embankment tightness. Determination of the water passage time (Tp) additionally requires finding the trajectory along which this time is the shortest possible. However, there is no need to analyse the unsteady filtration, which requires the determination of an initial condition and the course of time-dependent boundary conditions. Engineers in practice, often use the time Tpp which elapses from the beginning of flooding to the occurrence of seepage in the protected area. The relationship between the passage time (Tp) and the seepage onset time (Tpp) was analysed on a model example. Practical use of the curve of passage times is showed on the example of the reconstruction of the left-bank Warta embankment in the area of Konin.

5

Design of the turbocharger bearing arrangement to increase the overall efficiency of the combustion engine

Sroka Zbigniew, Prakash Srinath, Włostowski Radoslaw

Combustion Engines

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2022

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R. 61, nr 1

83--89

EN

The main objective of this study was to design a journal bearing, such that it can withstand the forces that arise in context to increasing the length of the shaft in an automotive turbocharger. The work will also provide information on how the design changes affect the overall performance of the bearing. The design changes include the thickness of the oil film, the number of grooves, the dimension of the grooves, the number of inlets and outlets, the dimension of the babbitt and mainly the length of the journal bearing. The simulation models were created using CATIA V5 and the analysis is done using ANSYS 19.2. The flow is considered to be laminar and is calculated using Reynold’s Equation. The new concept gave insight on how the design considerations affect the pressure distribution and the pressure developed. From the results, it was interpreted that the new design can withstand the four times the pressure while distributing the pressure over twice the original design.