Temat: hydraulic modelling - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical analysis for an optimization of a powered roof support operating in hazard conditions of minig tremors
Autorzy:: Szurgacz, D.
Powiązania:: https://bibliotekanauki.pl/articles/89179.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:: hydraulic leg
performance
hydraulic system
numerical analysis
modelling
Opis:: The article presents an optimization of Ø0.21/0.16 hydraulic leg system operating in a powered roof support Glinik 13/25 Pp type, working at longwall 6, seam 501, KWK Bobrek – Centrum - in hazard conditions of mining tremors. The process included numerical modelling and computer software, ANSYS CFX. The optimization allows to achieve an adequate capacity and performance of the hydraulic system which increases workplace safety in the mines. The article provides basic requirements that must be provided in order to conduct an analysis in ANSYS CFX. The software was used to carry out 10 simulations, which allowed to determine an optimal flow for the subject leg.
Źródło:: Mining Science; 2015, 22, Special Issue 2; 171-179
2300-9586
2353-5423
Pojawia się w:: Mining Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of liquid-nitrogen freezing of gas-bearing shale rocks on their compressive strength
Autorzy:: Borek, Kinga
Powiązania:: https://bibliotekanauki.pl/articles/127596.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mineralogiczne
Tematy:: hydraulic fracturing
black shales
freezing
compressive strength
modelling
Opis:: Any definable relation between falling temperature and the compressive strength of shale rocks should provide a useful predictive tool aiding optimization of the results of hydraulic fracturing. In this research, an automeasuring hydraulic press, a thermo-camera and the Fluent ANSYS software were used. The results of laboratory simulations, and the effects of experiments conducted on shale rocks to determine permanent changes in compressive strength, are presented. As both frozen rocks and rocks returned to room temperature show diminished compressive strength. It is suggested that prior freezing of rocks can increase the efficiency of fracturing.
Źródło:: Mineralogia; 2018, 49, 1/4; 7-16
1899-8291
1899-8526
Pojawia się w:: Mineralogia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modeling and analysis of a twin-tube hydraulic shock absorber
Modelowanie i analiza dwururowego tłumika hydraulicznego
Autorzy:: Ferdek, U.
Łuczko, J.
Powiązania:: https://bibliotekanauki.pl/articles/280494.pdf
Data publikacji:: 2012
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: hydraulic damper
shock absorber
damping force
modelling
vehicle suspension
Opis:: In this paper, a physical and mathematical model was created for a twin-tube hydraulic shock absorber, using oil as the working medium. To analyze the model, methods of numerical integration were incorporated. The effect of the amplitude and frequency of the excitation, as well as the parameters describing the flow rate of oil through the valves, were examined. The basic characteristics of the damping force were obtained.
W pracy wprowadzono model fizyczny i matematyczny dwururowego amortyzatora hydraulicznego, w którym czynnikiem roboczym jest olej amortyzatorowy. Do jego analizy wykorzystano metody numerycznego całkowania. Zbadano wpływ amplitudy i częstości wymuszenia oraz parametrów opisujących przepływ oleju przez zawory. Wyznaczono podstawowe charakterystyki siły tłumienia.
Źródło:: Journal of Theoretical and Applied Mechanics; 2012, 50, 2; 627-638
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Recent tectonic stress field investigations in Poland : a state of the art
Autorzy:: Jarosiński, M.
Powiązania:: https://bibliotekanauki.pl/articles/2059238.pdf
Data publikacji:: 2006
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Polska
recent geodynamics
tectonic stress
borehole breakouts
hydraulic fracturing
modelling
Opis:: The paper summarizes up-to-date knowledge of the contemporary tectonic stress field in Poland and compares the results of geophysical measurements with mathematical models. The extensive set of data provided by borehole breakout analyses is supplemented by hydraulic fracturing tests, earthquake focal mechanism solutions and preliminary resolution of regional intraplate motions from GPS measurements. Frequent breakout presence shows that tectonically driven anisotropy of horizontal stress is a common feature in the study area. Roughly N-S direction of maximum horizontal stress (SHmaxx) in Eastern Poland differs significantly from Western European stress domain. This difference is produced by tectonic push of Alcapa, which is successively compensated within the Teisseyre-Tornquist Zone (TTZ) and in the Upper Silesian segment of the Outer Carpathians. In the western part of Poland stress directions are ambiguous due to interplay of several additional tectonic factors. Most of hydraulic fracturing data and earthquake focal mechanism solutions indicate strike-slip stress regime in Eastern Poland where stresses are in equilibrium with preferentially oriented faults of Iow friction (0.16). Limited data from Western Poland suggest normal fault stress regime. Good conformity between directions of 5Hm", and intraplate motions occurs from comparison of breakout and GPS data. Finite element modelling shows that the most important factor shaping the stress field in Eastern and Central Poland is the Adria push transmitted through the Pannonian region. Secondary, but still notable factors are differentiation of loads along the Mediterranean collision zone and changes in magnitude of the ridge push force along the NW Continental passive margin of Europe. Results of rheological modelling indicate that the crust is entirely decoupled from the mantle in the Fore-Sudetic Platform, partial uncoupling in the base or the upper crust is possible in the TTZ while in the East European Craton (EEC) the whole lithosphere is coupled. The comparison of different set of data and models presented here provides a comprehensive geodynamic scenario for Poland, however, a number of unresolved questions still remains to be addressed.
Źródło:: Geological Quarterly; 2006, 50, 3; 303-321
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The application of Boolean algebra in modelling of leakage condition of a car hydraulic braking system
Autorzy:: Idzikowski, A.
Salamon, S.
Powiązania:: https://bibliotekanauki.pl/articles/265849.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: układ hamulcowy
układ hydrauliczny
wyciek
algebra Boole'a
modelowanie
braking system
hydraulic circuit
leakage
Boolean algebra
modelling
Opis:: A general characteristics of a car hydraulic braking system (CHBS) is presented in this publication. A graphical model of properties-component objects is developed for the above-mentioned system. Moreover, four mathematical models in terms of logic, the set theory and the Boolean algebra of Boolean functions are developed. The examination is ended with a general model of the CHBS for n - Boolean variables and the construction and mathematical-technical interpretation of this model is presented.
Źródło:: International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 353-363
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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