Autor: Urbanek, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Mineral matter transformation in oxy-fuel coal combustion
Autorzy:: Nowak-Woźny, D.
Moroń, W.
Urbanek, B.
Rybak, W.
Powiązania:: https://bibliotekanauki.pl/articles/185717.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: coal combustion
ash
slagging
sintering
spalanie węgla
popiół
żużlowanie
spiekanie
Opis:: The paper presents the results of the mechanical, electrical, CCSEM and XRD measurements of hard coal, conducted in simulated conditions of sintering in atmospheres of O2/CO2,. The changes of the coal ash resistivity are correlated with the content of the oxides and with the sintering temperature determined by the mechanical test and Leitz method. The SEM-EDS analysis was conducted for deposits on the probe. The changes of the measured ash samples, observed during sintering process in O2/CO2 atmosphere, were discussed in the ash microstructure point of view.
Źródło:: Chemical and Process Engineering; 2013, 34, 3; 393-401
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of amplitude-based and phase-based method for speed tracking in application to wind turbines
Autorzy:: Urbanek, J.
Barszcz, T.
Sawalhi, N.
Randall, R. B.
Powiązania:: https://bibliotekanauki.pl/articles/220435.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: speed tracking
speed estimation
instantaneous frequency
wind turbines
Opis:: Focus of the vibration expert community shifts more and more towards diagnosing machines subjected to varying rotational speeds and loads. Such machines require order analysis for proper fault detection and identification. In many cases phase markers (tachometers, encoders, etc) are used to help performing the resampling of the vibration signals to remove the speed fluctuations and smearing from the spectrum (order tracking). However, not all machines have the facility to install speed tracking sensors, due to design or cost reasons, and the signal itself has to then be used to extract this information. This paper is focused on the problem of speed tracking in wind turbines, which represent typical situations for speed and load variation. The basic design of a wind turbine is presented. Two main types of speed control i.e. stall and pitch control are presented. The authors have investigated two methods of speed tracking, using information from the signal (without relying on a speed signal). One method is based on extracting a reference signal to use as a tachometer, while the other is phase-based (phase demodulation).Both methods are presented and applied to the vibration data from real wind turbines. The results are compared with each other and with the actual speed data.
Źródło:: Metrology and Measurement Systems; 2011, 18, 2; 295-303
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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