Wyniki wyszukiwania - BazTech

1

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.

2

Pomiarowa identyfikacja emisji pola elektromagnetycznego przez samochód elektryczny

Gumiela Jacek, Sitnik Lech, Sztafrowski Dariusz

Przegląd Elektrotechniczny

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2019

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R. 95, nr 12

128--131

PL

Coraz bardziej dynamicznie rozwijający się rynek pojazdów elektrycznych powoduje konieczność dostosowania systemów certyfikacji oraz kontroli w zakresie oddziaływania na środowisko zewnętrzne jak również na kierowcę i/lub pasażerów takich pojazdów. Zabudowane akumulatory, przekształtniki energoelektroniczne oraz maszyny elektryczne wraz z systemem wzajemnych połączeń mogą być źródłami silnych pól elektromagnetycznych w szerokim zakresie częstotliwości. Konieczne zatem staje się sprawdzenie czy natężenie generowanego pola elektromagnetycznego spełnia obowiązujące normy oraz zbadanie możliwości ich ograniczenia lub odpowiedniego kształtowania w celu zmniejszenia narażenia człowieka.

EN

The dynamically expansion of electric vehicles solutions technology makes it necessary to adapt certification and control systems in terms of impact on the natural environment as well as on the driver and / or passengers of such vehicles. Built-in batteries, power converters and electric machines together with the interconnection system can be sources of strong electromagnetic fields in a wide frequency range. Therefore, it becomes necessary to check whether the intensity of the generated electromagnetic field meets applicable standards and to tests the possibilities of their limitation or appropriate shaping to reduce exposure for human.

3

The analysis of vibrations of gasoline and diesel vehicles as a function of their engine sizes

Łoza Łukasz, Wróbel Radosław, Sitnik Lech

Combustion Engines

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2019

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R. 58, nr 3

20--23

EN

This paper presents a study of vibrations appearing in a vehicle in the process of its operation. The authors describe the primary source of the vibrations and their propagation in the entire structure. The observations were performed on the passenger cars with various gasoline and diesel engines. The aim was to examine the level of damping factor in the different locations in the car, precisely specified for the purpose of this studies. The secondary goal was to develop an effective method of obtaining and analyzing signals generated during the engine operation. The chosen instrument was Laser Doppler Vibrometer (LDV), which is used as the non-intrusive measurement utensil to detect velocity variations in designated places. The signals are gathered and collected as group of sinusoidal characteristics in the time domain. In order to achieve specific information about every component of the original signal, the authors apply Fast Fourier Transform (FFT) as the analyzing method. It allows to distinct the basic sinusoidal characteristics in the frequency domain through the spectral analysis. Based on the results, the authors are able to distinguish the dominant modes from the complex signal and indicate their impact on the car.