Wszystkie pola: hydrodynamic bearing - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Nonlinear analysis of the stability of hydrodynamic bearings
Autorzy:: Amamou, A.
Chouchane, M.
Naimi, S.
Powiązania:: https://bibliotekanauki.pl/articles/327246.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: łożysko hydrodynamiczne
analiza nieliniowa
bifurkacja Hopfa
hydrodynamic bearing
stability analysis
nonlinear analysis
Hopf bifurcation
limit cycles
Opis:: The linear analysis of the stability of a hydrodynamic bearing is used to determine the stability boundaries and to predict if the steady state is stable or not. A nonlinear or weakly nonlinear model is used to determine the behaviour of the system near the critical stability boundaries. By applying the Hopf bifurcation theory, the existence of stable or unstable limit cycles in the neighbourhood of the stability boundaries can be predicted depending on the characteristics of the bearing.A numerical integration of the nonlinear equations of motion is then carried out in order to verify the results obtained analytically.
Źródło:: Diagnostyka; 2009, 4(52); 3-10
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Application of the Teager-Kaiser energy operator to detect instability of a plain bearing
Zastosowanie operatora energetycznego Teager-Kaisera do detekcji niestabilności łożyska ślizgowego
Autorzy:: Blaut, J.
Korbiel, T.
Batko, W.
Powiązania:: https://bibliotekanauki.pl/articles/328634.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: Kaiser
Teager
TKEO
energy operator
hydrodynamic lubrication
fluid bearings
dynamic stability
nonlinear analysis
operator energetyczny
smarowanie hydrodynamiczne
łożysko ślizgowe
stabilność
analiza nieliniowa
Opis:: The paper presents application of a non-linear method (energy operator) to monitor the operation of a plain bearing. The possibility of using the energy operator to evaluate the energy of a simulated mechanical system was analysed. Then, an experiment was conducted in the laboratory environment which involved observation of oil vortexes. This allowed to show the possibility of using the energy operator as a descriptor of operating state of a hydrodynamic bearing.
W artykule zaprezentowano użycie metody analizy nieliniowej jaką jest operator energetyczny w celu monitorowania pracy łożyska ślizgowego. Przeanalizowano możliwość użycia operatora energetycznego w celu oceny energii symulowanego układu mechanicznego. Potwierdziło to zależność pomiędzy energią w ujęciu newtonowski a wartością operatora energetycznego. Następnie przeprowadzono eksperyment na stanowisku laboratoryjnym polegający na obserwowaniu powstawania drgań olejowych. Pozwoliło to wskazać na możliwość stosowania operatora energetycznego jako deskryptora stanu pracy łożyska hydrodynamicznego.
Źródło:: Diagnostyka; 2016, 17, 4; 99-105
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Elastohydrodynamic analysis of a journal bearing with different grade oils considering thermal and cavitation effects using CFD-FSI
Autorzy:: Kadhim, Zainab H.
Hammed, Lekaa
Rahima, Fatima A.
Ridha, Ali Mohammed
Powiązania:: https://bibliotekanauki.pl/articles/2203641.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: journal bearing
hydrodynamic lubrication
thermal effect
elastic deformation
cavitation effect
CFD
smarowanie hydrodynamiczne
efekt cieplny
odkształcenie sprężyste
łożysko
Opis:: This paper investigates a three-dimensional CFD analysis of hydrodynamic journal bearing performance for two different available types of lubricants, SEA 10W50 and SEA 15W40, considering thermal, elastic deformation, and cavitation effects. A 3-dimensional CFD model founded on continuity, momentum, energy, in addition elasticity equations has been implemented. The analysis is performed for a bearing with different journal speeds (1000-3000rpm) and eccentricity ratios (0.1-0.9). The cavitation effect was considered using the model of Zwart-Gerber-Balamri multiphase flow model. The bearing material elastic deformation was considered by implementing the two-way FSI technique through ANSYS-FLUENT 2019 R2. A comparative study of the oil film temperature, thermal pressure, also the load capacity by the bearing has been performed. By comparing the current work's oil film temperature results with those obtained by Ferron et al (1983), with a maximum deviation between the results not exceeding 3 percent, the mathematical model was validated. The findings demonstrate that, once the cavitation consequence is taken into account, the lubricant film pressure decreases. Furthermore, at what time the bearing rotates at greater eccentricity ratios and rotational speeds, more deformation material of the bearing is seen. The current research may help in predicting the bearing performance parameters in real-world situations.
Źródło:: Diagnostyka; 2023, 24, 2; art. no. 2023213
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effect of micro protrusions on the performance of elliptical journal bearings operating with couple stress lubricant
Autorzy:: Abass, Basim Ajeel
Mahdi, Mushrek A.
Powiązania:: https://bibliotekanauki.pl/articles/1840900.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: elliptical journal bearing
hydrodynamic lubrication
micro-protrusions
couple-stress lubricant
non-Newtonian fluids
smarowanie hydrodynamiczne
płyny nienewtonowskie
Opis:: Elliptical bearing is characterized by low induced temperature and high stability at higher speed in comparison with the cylindrical journal bearing. The performance of such bearings can be affected by the type of oil used and its surface properties. The main goal of this work is to study the surface micro protrusion effect on the steady state operation of elliptical journal bearing lubricated with couple stress lubricant. The modified Reynolds’ equation to take into account the effects of couple stress lubricant and micro protrusions of the bearing surfaces is solved using finite difference method. The governing equations were solved using a prepared FORTRAN computer program. Pressure distribution, load carrying capacity and coefficient of friction have been studied for a bearing in laminar flow regime. The mathematical model was validated by comparing pressure results for the elliptical bearing of the present work with that obtained by Hussain et al.(1996). The obtained results demonstrate that the lubricant pressure and the load carried by the bearing decrease for the bearing with higher ellipticity factor while the load carried by the bearing increases for the bearing with higher protrusions or when using a couple stress fluid with higher couple stress variable.
Źródło:: Diagnostyka; 2021, 22, 2; 97-104
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: CFD analysis of nano-lubricated journal bearing considering variable viscosity and elastic deformation effects
Autorzy:: Kadhim, Zainab H.
Ahmed, Saba Y.
Abass, Basim A.
Powiązania:: https://bibliotekanauki.pl/articles/2096173.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: hydrodynamic journal bearings
computational fluid dynamics
thermohydrodynamic lubrication
nano-lubricant
elastic deformation
hydrodynamika
łożyska ślizgowe
numeryczna mechanika płynów
smarowanie hydrodynamiczne
odkształcenie sprężyste
Opis:: The main objective of the present work is to study the behavior of Nano-lubricated journal bearing considering elasticity and variable viscosity effects. A mathematical model for a journal bearing is employed using three-dimensional computational fluid dynamics. The study is implemented for a journal bearing with laminar flow and smooth surfaces lubricated with pure oil as well as lubricants containing different concentrations of Al2O3 Nano-particles. The dependence of the oil viscosity on the temperature is considered by using the modified Krieger Dougherty model. Pressure, temperature and elastic deformation in addition to the bearing load-carrying capacity of the bearing working under different eccentricity ratios (0.1-0.6) have been studied. The mathematical model is confirmed by comparing the results of the pressure and temperature distributions obtained in the current work with those obtained by Ferron et al.(1983) for a bearing lubricated with pure oil. Also, the pressure obtained for the Nano-lubricated bearing of the present work is validated with that obtained by Solighar (2015). The results are found in good agreement with a maximum deviation not exceeding 5%. The obtained results show that the oil film pressure increases by about 17.9% with a slight decrease in oil film temperature and friction coefficient.
Źródło:: Diagnostyka; 2022, 23, 1; 1--8
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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