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1
Content available A study of control scheme of debris flows and geological disasters in the Shiwei river basin
Wu Hanhui
Archives of Civil Engineering
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2024
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Vol. 70, nr 1
509--526
EN
The basic characteristics of debris flows in the Shiwei river basin are summarized through the field investigation on debris flows in the Shiwei river basin and analysis on formation conditions of debris flows from three aspects, i.e. geological environment, geological structure and neotectonic movement, as well as seismic action. Based on this, the stability of landslide in the Shiwei river basin is analyzed and calculated, and the stability coefficient of landslide is obtained. The debris flows in the Shiwei river basin will directly damage and threaten the county town, while other geological disasters such as landslide, collapse, slope sliding & collapse and potentially unstable slopes will indirectly damage and threaten the county town. The landslide form is clear, and the landslide stability calculation shows that the landslide body is generally stable – basically stable, but partially unstable – less stable. The “blocking + discharging” comprehensive control scheme is proposed according to the formation conditions and development characteristics of debris flows in the Shiwei river basin, and the study findings can be used as a reference for similar projects.
2
Content available A study of landslide body control of black bovine cave copper ore mining and beneficiation project
Wu Hanhui
Archives of Civil Engineering
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2023
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Vol. 69, nr 2
291--309
EN
Landslide is a common geological disaster which causes huge losses to people’s properties and national economic development. How to prevent and control landslides has become an important issue. This article introduces the geological and geographical environment of the landslide body, analyzes the basic characteristics of the landslide, calculates the landslide stability based on the ultimate equilibrium theory-based transfer coefficient method, discusses the development trend of the landslide and comes up with corresponding control schemes by taking the landslide body of Black Bovine Cave Copper Ore Mining & Beneficiation Project as example. It is found that the control scheme - “anti-slide pile + retraining wall + baffle + anchor cable” can be used to effectively prevent and control the geological disaster according to calculation. The study results can provide a reference for landslide body control.
3
Content available Zastosowanie czujników w układach elektropneumatycznych
Krzysztoszek K., Podsiadły D.
Autobusy : technika, eksploatacja, systemy transportowe
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2018
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R. 19, nr 6
528--531, CD
PL
W układach sterowania pneumatycznego i elektropneumatycznego skuteczne działanie uzależnione jest od możliwości użycia czujników i ich poprawnego działania. Powszechnie znalazły zastosowanie czujniki działające bezdotykowo. Artykuł przedstawia opis stanowiska laboratoryjnego firmy FESTO DIDACTIC, składającego się ze stołu montażowego, zestawu elementów wykonawczych (siłowników), zaworów elektropneumatycznych, komponentów zbliżeniowych oraz oprogramowania FluidSim-P.
EN
The article presents a description of the FESTO DIDACTIC laboratory stand, consisting of assembly table, a set of actuators, electro-pneumatic valves, proximity components and FluidSim-P software. In pneumatic and electro-pneumatic control systems, effective operation depends on the possibility of using sensors and their correct operation. Sensors that work without contact have been widely used.
4
Content available remote Design and Control of Multi-terminal VSC-HVDC for Large Offshore Wind Farms
Shi G., Cai X., Chen Z.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 12a
264-268
EN
In this paper, the parameters design of VSC-HVDC terminal is proposed. A four-terminal VSC-HVDC system is configured as the simplified study system. The control schemes of coordinated control and master-slave control for MTDC system power delivery are investigated and their shortages are introduced. The control effect and power system stability is evaluated by three dynamic simulation cases based on PSCAD/EMTDC, which correspond to wind power fluctuation.
PL
W artykule przedstawiono dobór parametrów układu VSC-HVDC. Badania oparto na układzie cztero-stronnym, z wykorzystaniem algorytmu sterowania mocą wyjściową systemu wielostronnego. Wykonano symulacje w PSCAD/EMTDC stanów dynamicznych, odzwierciedlające zmienność wiatru.
5
Content available remote Graph methods in kinematical analysis of multi-speed epicyclic gears
Drewniak J., Zawiślak S.
International Journal of Applied Mechanics and Engineering
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2012
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Vol. 17, no. 3
791-798
EN
Multi-speed epicyclic gears are used automatic gear boxes when they are equipped with a control system. The methods of analysis of these gears are discussed in the paper. Graph based methods can be used for modelling and kinematic analysis of gears. The methods are roughly described. They were applied for modelling and analysis of an exemplary gear box. Their advantages consist in simplicity, algorithmic approach and usefulness. A comparison of results obtained by means of the graph and Willis approaches is presented. The equivalence of results confirms, the correctness of theoretical modelling.
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