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Abstrakt

In the paper, a new model of friction coupling in rolling friction is presented. Apart from slips related to elastic and plastic deformation in the area of actual contact of two bodies, the mechanism includes also inertia forces related to tangential deformations. Research concerning a model of coupling mechanism of variable ratio friction wheels is described. The main objective or the investigation was to prove that the force acting along the contact line of friction wheels is significantly affected by the shape of the contact area which had not been taken into account in the relations applied so far. A new model of the coupling mechanism was suggested and verified experimentally.
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Autorzy i Afiliacje

Czesław Koziarski

Abstrakt

Celem pracy była weryfikacja prognoz temperatury i mineralizacji wód dolnej jury i dolnej kredy na Niżu Polskim, na podstawie nowej informacji geologicznej. W pierwszym z serii artykułów, pt. Weryfikacja uwarunkowań geotermalnych na Niżu Polskim na podstawie danych z nowych wierceń zrealizowanych w latach 2000–2022, przedstawiono analizę warunków geotermalnych, natomiast w niniejszej pracy zwrócono uwagę na parametry mające wpływ na warunki hydrogeochemiczne, tj. temperaturę w stropie utworów oraz mineralizację wód. W tym celu wykorzystano dane z C entralnej Bazy Danych Geologicznych (CBDG), Centralnego Banku Danych Hydrogeologicznych – Bank HYDRO oraz z dotychczas opublikowanych prac naukowo-badawczych. W latach 2000–2023 wykonano i udokumentowano na obszarze Niżu Polskiego 24 otwory poszukiwawcze o głębokości przekraczającej 1000 m p.p.t dostarczające informacji o temperaturze i mineralizacji wód ujmowanych z utworów dolnej jury lub dolnej kredy. Ocenę zmian przestrzennych, tak jak w przypadku pierwszej części pracy, wykonano z wykorzystaniem oprogramowania QGIS Desktop 3.24.1, oprogramowania geoinformacyjnego (GIS ) umożliwiającego przeglądanie, edytowanie i analizowanie danych przestrzennych oraz tworzenie map. Zaprezentowane analizy pozwoliły na dokonanie punktowej, lokalnej korekty prognozowanego przebiegu izolinii w odniesieniu do publikowanych wcześniej map w Atlasie zasobów geotermalnych na Niżu Polskim. Formacje mezozoiku opracowanym w 2006 r., pod redakcja naukową Wojciecha Góreckiego.
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Autorzy i Afiliacje

Wiesław Bujakowski
1
ORCID: ORCID
Piotr Zacharski
2
Barbara Tomaszewska
3
ORCID: ORCID
Magdalena Tyszer
1
ORCID: ORCID
Karol Pierzchała
1
Bogusław Bielec
1
ORCID: ORCID
Leszek Pająk
4
ORCID: ORCID
Beata Kępińska
1
ORCID: ORCID
Krystian Szczepański
2

  1. Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Kraków, Poland
  2. Institute of Environmental Protection – National Research Institute, Warszawa, Poland
  3. Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Kraków, Poland; AGH University of Science and Technology, Kraków, Poland
  4. Mineral and Energy Economy Research Institute, Polish Academy of Sciences, Kraków, Poland; AGH Universityof Science and Technology, Kraków, Poland
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Abstrakt

The two-variable refined plate theory is used in this paper for the analysis of thick plates resting on elastic foundation. This theory contains only two unknown parameters and predicts parabolic variation of transverse shear stresses. It satisfies the zero traction on the plate surfaces without using shear correction factor. Using the principle of minimum potential energy, the governing equations for simply supported rectangular plates resting on Winkler elastic foundation are obtained. The Navier method is adopted for solution of obtained coupled governing equations, and several benchmark problems under various loading conditions are solved by present theory. The comparison of obtained results with other common theories shows the excellent efficiency of this theory in modeling thick plates resting on elastic foundation. Also, the effect of foundation modulus, plate thickness and type of loading are studied and the results show that the deflections are decreased by increasing the foundation modulus and plate thickness.

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Bibliografia

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Autorzy i Afiliacje

Jafar Rouzegar
Reza Abdoli Sharifpoor

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