Autor: Czaban, A - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Friction forces and friction coefficient in slide parabolic micro-bearing with consideration of the adhesion force
Autorzy:: Miszczyk, Miszczak, A.
Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/244068.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: adsorption
adhesion
capillary forces
micro-bearing lubrication
Opis:: Micro-bearings have many applications in computer devices, such as CPU fans or hard disc drives. So far, rolling bearings and slide bearings have been used,for example micro-bearing with smooth Journal and sleeve surface, which is known as FDB - Fluid Dynamic Bearing. Actually, latter versions of micro-bearings are being launched to the market: Ex-FDB - Extra Fluid Dynamic Bearing. This type of bearings was fabricated by putting some micro-grooves filled with oil on its interna! surfaces. Ex-FDB's are characterized by reduced level of generated noise and guarantee long failure-free fan life, reaching 120 000 hours. In this paper we present our numerical calculations of the friction force and the friction coefficient in the parabolic micro-bearing. Micro-bearing gap height is very low, often less then l micrometer, therefore capillarity and adhesion forces cause an increase of oil viscosity near the Journal and sleeve surfaces. Due to this fact a value of hydrodynamic pressure in micro-bearing gap also increases, what results in observed changes of capacity, friction forces and friction coefficient values. The influence of adhesion and capillarity on friction force and friction coefficient of oil in micro-bearing hasn't been considered from analytical point of view so far. This paper presents numerical results of computed values of friction forces and friction coefficient for parabolic micro-bearing in comparison to values for classical parabolic bearing.
Źródło:: Journal of KONES; 2010, 17, 3; 293-299
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Nano-hardness of the material of thin layers of the injector tip depending on the depth under the precisly finished co-operating surfaces
Autorzy:: Miszczak, A.
Kuznetsova, T.
Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/243108.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: nanohardness
Young's modulus
nano-identer
injector tip nozzle
injector spray pattern
injector tip needle
Opis:: In this paper, the authors present the results of experimental studies of the nano-hardness and Young's modulus of the injector spray pattern body and needle (the tip of the injector). The nano-hardness of a thin-layer of precisely finished co-operating surfaces was tested according to the depth below the surface of the sample (deep into the material). The quality of precisely finished surfaces of a fuel infector has a very large impact on the proper operation of a diesel engine. Both, the needle and the body of the injector spray pattern, are individually adjusted and lapped to maintain the proper gap between them. The gap between the needle and the injector tip body affects the proper dosage and quality of the sprayed fuel. Impurities in the fuel are of the same order of magnitude or even greater than this gap. Hard particles that penetrate between the side surfaces of the needle and body of the injector tip could result in scratching, which generate leaks and drops of injection pressure, increased fuel consumption, poor spraying of fuel, leaking of fuel to the lubricating oil and reduction of its operating properties. The hardness of the precisely finished surfaces of the injector is essential in the process of wear of these surfaces. The aim of the study was to determine the hardness and Young's modulus of thin layers of precisely finished co-operating surfaces of injector tip and estimation of the thickness of these layers. The nano-hardness measurements were made with the Hysitron TI 950 TriboIdenter, where the test is conducted using a nano-indenter with a mechanical method. The device allows selecting from several to several dozen of measurement points and performs automatic measurement of nano-hardness and Young's modulus in the indicated locations. The study concerns the tip (body and needle) of the non-used Bosch DLLA 160 S 1305 injector. The presented results can be used to develop some new methods of coating the co-operating surfaces with the hard thin layers, e.g. the use of titanium in order to decrease wear and increase scratching resistance.
Źródło:: Journal of KONES; 2015, 22, 3; 155-160
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Surface topography of operated slide journal micro - bearings used in computer fans
Autorzy:: Miszczak, A.
Czaban, A.
Labuda, W.
Powiązania:: https://bibliotekanauki.pl/articles/242980.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: atomic force microscope
surface topography
microgrooves
herringbone grooves
micro-bearing
Opis:: In this paper authors present results of measurements of slide journal bearings surface topography measured with a profilometer and an atomic force microscope (AFM). Surface topography of investigated bearings (i.e. journals and sleeves) was measured using the Hommeltester T8000- R60 profilometer. The results of these measurements give information about micro-grooves dimensions and location. Measurements of surface topography were made for journals and sleeves of slide journal micro-bearings from personal computers fans, with the Atomic Force Microscope NT-206 produced in MTM in Minsk, Republic of Belarus. The results of measurements of surface topography were presented in the form of surface topography maps, threedimensional graphs and some examples of selected cross-sections of investigated surfaces in the form of profile graphs. The values of profile roughness parameters Ra and Rq and the distance between maximum peak height and maximum valley depth are presented as well. The application SurfaceXplorer registered trademark was used for processing and visualization of the data obtained from AFM NT-206, which besides from generating 2D, 3D and profile diagrams, was used to calculate and draw graphs of height distribution. In this research authors used two identical sets of micro-bearings. The investigated bearings are: a) Kama Flow SP0825FDB12H fan with grooved surface of bearing sleeve, b) Xilence Case fan which sleeve surface was without grooves. First set of that micro-bearings functioned for a year at rated RPM continuously (i.e. 24 hours a day). Second set of the same micro-bearings also functioned for a year at rated RPM, but in intermittent mode (i.e. 15 minutes on, 15 minutes off). On the surfaces of studied micro-bearings some microgrooves can be found in form of herringbone, with depth about 1-2..m and width 100-150..m. Received information about microgrooves geometry will help to develop proper theory of hydrodynamic lubrication for micro-bearings with microgrooves and allows determining how the mode of operating affects on the wear of co-operating surfaces.
Źródło:: Journal of KONES; 2012, 19, 4; 457-463
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Surface topography of slide journal bearings
Autorzy:: Miszczak, A.
Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/246105.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: atomic force microscope
surface topography
journal bearing
Opis:: In this article the measurements results of surface topography of different types of slide bearings sleeves have been presented. The research has been conducted with the use of atomic force microscope (AFM). The results of measurements of surface topography were presented in the form of surface topography maps, three-dimensional graphs and some examples of selected cross-sections of investigated surface in the form of profile graphs. Measurements of surface topography were made for thin-walled sleeves of slide journal bearings covered with PTFE, POM, bronze and white metal layers. Operated and new sleeves have been considered with the use of Atomic Force Microscope NT-206produced in MTM in Minsk, Republic of Belarus [2]. Atomic Force Microscope NT-206 provides information for samples with maximum roughness value plus or minus 1 mi m. Max. field in one scanning process is up to 32)um x 32mi m. Measurements were preceded with resolution 256x256points. Presented in the work results of surface topography measurements also include the calculated values of average deviation profile Ra and Rq and the value of fixed distance between the lowest and highest inequality. The application SurfaceXplorer was used for processing and visualization of the data obtained from AFM NT-206, which besides from generating 2D, 3D and profile diagrams, was used to calculate and draw graph of height distribution. The comparison of received data will allow verifying type and amount of surface wear of discussed journal micro-bearings parts in micro and nanoscale and will help to design surface layers with improved tribological properties.
Źródło:: Journal of KONES; 2011, 18, 3; 279-285
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Formalnoprawne aspekty funkcjonowania związków międzygminnych
Formal and legal aspects of municipal associations
Autorzy:: Milewska, A.
Czaban, T.
Powiązania:: https://bibliotekanauki.pl/articles/842390.pdf
Data publikacji:: 2014
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:: The subject of this article was to show the organization and financing of municipal tasks. Author describes the motives and the legal and formal aspects about creation of communal association. Municipal waste management is one of the many tasks of the municipality, which is associated with the protection of the environment, also remaining in the duties of the municipality. This is an area very broad, requiring both expensive infrastructure and adequate organization of the municipality. High capital investment and significant expenditure on the maintenance and the fact that such a task often beyond the financial and organizational individual municipalities, encourages governments to cooperate in this field.
Źródło:: Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego. Ekonomika i Organizacja Gospodarki Żywnościowej; 2014, 106
2081-6979
Pojawia się w:: Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego. Ekonomika i Organizacja Gospodarki Żywnościowej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Models of viscosity characteristics η=η(b) of ferro-oil with different concentration of magnetic particles in the presence of external magnetic field
Autorzy:: Frycz, M.
Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/244776.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ferro-oil
dynamic viscosity
magnetic particles concentration
external magnetic field
Opis:: The purpose of this article is to determine, identify and describe the viscosity characteristics of the ferro-oil with different concentrations of magnetic particles in the presence of an external magnetic field interaction. These characteristics are defined in the context of magnetic induction changes. These rheological tests were performed on a Physica MCR 301 rheometer. It was used a measuring system ‘plate to plate’ type which was armed with magneto-rheological research system MRD 180/1T. The tests were performed for the selected temperature of the medium i.e. 90°C, the shear rate θ changes were carried from 0 to 1000 1/s. Changes of the magnetic field intensity value were ranged from 0 to 500 mT. The selected concentrations of magnetic particles in a ferro-oil were 1%, 2%, 4%, 6% and 8% and the tested ferro-oil was product of FerroTec of Unterensingen (Germany), which is a mixture of colloidal mineral motor oil Penzzoil’s LongLife Gold's SAE 15W-40 with Fe3O4 magnetic particles and the surfactant. Analyses of the results, identify and matching characteristic were calculated using STATISTICA software. It has been proposed three categories of functions mapping the waveforms of the results obtained experimentally: the exponential function, logarithmic with basis of the normal and the polynomial function.
Źródło:: Journal of KONES; 2014, 21, 4; 119-126
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Eksploatacja litowo-jonowych magazynów energii
Lithum-Ion energy storage exploatation
Autorzy:: Figura, R.
Szafraniec, A.
Czaban, A.
Lewoniuk, W.
Powiązania:: https://bibliotekanauki.pl/articles/314754.pdf
Data publikacji:: 2017
Wydawca:: Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:: litowo-jonowy magazyn energii
falownik fotowoltaiczny
magazynowanie energii elektrycznej
lithium-ion energy storage
photovoltaic inverter
electricity storage systems
Opis:: W artykule omówiono zagadnienia związane z eksploatacją litowo-jonowych magazynów energii elektrycznej na przykładzie badań wykonanych w Laboratorium fotowoltaiki Uniwersytetu Technologiczno-Humanistycznego im. Kazimierza Pułaskiego w Radomiu. Przedstawiono wyniki badań związanych z ładowaniem oraz rozładowaniem litowo-jonowego magazynu energii współpracującego z hybrydowym falownikiem fotowoltaicznym. Przeanalizowano wpływ zmniejszenia mocy odbiornika na charakterystykę rozładowania litowych magazynów energii elektrycznej.
This article discusses the issues related to the exploitation of lithium-ion electricity storage facilities on the example of research carried out in the Photovoltaic Laboratory of the Kazimierz Pulaski University of Technology and Humanities in Radom. The results of studies related to the charging and discharging of lithium-ion energy storage device cooperating with hybrid photovoltaic inverter are presented. The discharge power reduction influence on the lithium energy storage characteristic was analyzed
Źródło:: Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 865-868, CD
1509-5878
2450-7725
Pojawia się w:: Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Statystyczna ocena wpływu składowiska odpadów przemysłowych na wody powierzchniowe
Statistical impact of industrial tailings pond on surface water
Autorzy:: Czaban, S.
Dabrowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/62002.pdf
Data publikacji:: 2008
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: odpady przemyslowe
skladowiska odpadow
oddzialywanie na srodowisko
wody powierzchniowe
zanieczyszczenia wod
chlorki
siarczany
stezenie zanieczyszczen
szeregi czasowe
Opis:: W składowisku odpadów przemysłowych o powierzchni ok. 1400 ha systemem hydrotransportu przesyłanych jest ok. 28 mln Mg odpadów flotacji. Mineralne odpady nie stanowią większych uciążliwości dla środowiska (z wyjątkiem pylenia). Istotnym problemem środowiskowym jest wpływ składowiska na wody powierzchniowe i podziemne ze względu na duże stężenia chlorków, siarczanów, sodu i magnezu w akwenie. Na podstawie 10-letnich badań monitoringowych określono dynamikę stężeń i ładunków chlorków i siarczanów w wodach powierzchniowych wokół składowiska. Oceniono także charakterystyczne stężenia wód powierzchniowych w funkcji zmienności jakości wody w akwenie składowiska.
In a tailings pond of approx. 1400 ha, a hydrotransport system conveys approx. 28 mln mg of flotation waste. Mineral waste is not really harmful to the environment (except for dust emission). What does pose a problem is the environment’s impact on surface and ground water, which is due to high concentration of chlorides, sulfates, sodium and magnesium in the water body. Based on a 10 year monitoring research program, the dynamics of chlorides and sulfates’ concentrations and charges in surface water around the tailings pond will be presented. Characteristic concentrations of surface water as a function of water quality in the tailings pond will also be evaluated.
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2008, 07
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Colonization of wheat grain by Fusaria in two crop management systems varying in intensity of production technology.
Autorzy:: Czaban, J.
Wróblewska, B.
Sułek, A.
Podolska, G.
Powiązania:: https://bibliotekanauki.pl/articles/2199604.pdf
Data publikacji:: 2011-12-20
Wydawca:: Instytut Hodowli i Aklimatyzacji Roślin
Tematy:: wheat
grain infection level
fusarium species
crop management system
rainfall level
Opis:: The purpose of this study was to investigate the effects of two cropping systems (intensive and integrated) on infection level of winter and spring wheat kernels by Fusarium species. Field experiments were conducted with winter wheat ‘Tonacja’ and spring wheat ‘Bombona’ during two consecutive growing seasons (2007/2008 and 2008/2009 - winter wheat, and 2008 and 2009 - spring wheat). A rainfall level in 2009 from the last decade of May to the first decade of July was 2.5-times higher than that in 2008. After the harvest, kernels were surface disinfected with 1.5% NaOCl solution for 2 min and then analysed for the infection level by different species of Fusarium. Fusaria were isolated on CZID medium and identified on the basis of macro - and micro-morphology on three media (PDA, SNA and a medium containing tannin). Our results demonstrate that the wheat grain infection by Fusarium depended mainly on a rainfall level. The intensive cropping system was more conducive to the grain infection by fusaria in comparison to the integrated one. The most frequent species were F. avenaceum in 2008, and F. graminearum, F. avenaceum and F. poae in 2009.
Źródło:: Plant Breeding and Seed Science; 2011, 64; 3-14
1429-3862
2083-599X
Pojawia się w:: Plant Breeding and Seed Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: CFD analysis of effect of misalignment plane position on hydrodynamic lubrication of slide conical bearing
Autorzy:: Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/246851.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: slide bearing
hydrodynamic lubrication
conical bearing
misalignment
CFD
pressure distribution
Opis:: The numerical calculations of the hydrodynamic lubrication of slide bearings can be carried out by modelling the oil flow for a given value of height of bearing lubrication gap. On the basis of the assumed height of the lubrication gap, the values of hydrodynamic pressures, load carrying capacities, friction forces, temperatures, can be determined. The bearing lubrication gap height can be influenced by many effects, e.g. misalignment between the shaft axis and the axis of the sleeve, vibrations, varying load, change in the viscosity value of lubricating oil caused by changes in temperature, pressure, shear rate or by oil ageing, wear of journal and sleeve surfaces. This article presents the results of numerical simulations concerning the influence of the misalignment between the axis of shaft and the axis of sleeve of the sliding conical bearing on its hydrodynamic lubrication, by taking into account the position of the plane in which the misalignment occurs. In this study, there was defined an angle between the plane in which the misalignment occurs and the plane in which lies the line of centres of corresponding bearing without misalignment. In this research, to investigate the impact of the position of the plane in which the misalignment occurs, the CFD software, designed to solve general flow phenomena, was used. It was assumed, that the bearings operate in a steady state conditions, the flow in the bearing lubrication gap is laminar and non-isothermal. A lubricating oil has shear properties as the Ostwald-de Waele fluid.
Źródło:: Journal of KONES; 2017, 24, 2; 65-72
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: CFD analysis of hydrodynamic lubrication of slide conical bearing with consideration of the bearing shaft and sleeve surface roughness
Autorzy:: Czaban, A
Powiązania:: https://bibliotekanauki.pl/articles/246600.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: conical bearing
surface roughness
hydrodynamic lubrication
CFD simulation
non-Newtonian oil
pressure distribution
sand-grain roughness
Opis:: In this work is shown the result of CFD simulation of hydrodynamic conical bearing lubrication with consideration of the effect of the bearing shaft and sleeve surface roughness. The oil flow in a bearing lubrication gap largely depend on the condition of the cooperating surfaces of a bearing. Surface irregularities are formed already at the manufacturing process and furthermore the quality of the surface may change during operation of a bearing. In this work, as a parameter describing surface condition, the Ks roughness height parameter was taken (i.e. sand-grain roughness height). The hydrodynamic pressure distribution in lubrication gaps of investigated bearings were calculated by using the commercial CFD software ANSYS Academic Research for fluid flow phenomenon (Fluent). Calculations were conducted for bearings without misalignment. The Ostwald-de Waele model for non-Newtonian fluids was adopted in this simulation. The coefficients of Ostwald-de Waele relationship were determined by application of the least squares approximation method and fitting curves described by this model to the experimental data, obtained for some motor oils, presented in previous work. The calculated hydrodynamic pressure distributions were compared with the data obtained for corresponding bearings, but assuming that bearings have smooth surfaces and there is no slip on surfaces. This paper presents results for bearings with different rotational speeds and of different bearing gap heights.
Źródło:: Journal of KONES; 2014, 21, 3; 35-40
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: CFD analysis of influence of axial position of shaft on hydrodynamic lubrication of slide conical bearing
Autorzy:: Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/241575.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: hydrodynamic lubrication
conical bearing
slide bearing
radial clearance
CFD
Opis:: During the operation of a slide bearing, the position of its shaft or sleeve varies due to many factors, such as vibrations, load changes, changes in the lubricating viscosity. The vibrations or varying load can cause, that the position of the bearing shaft, measured along its axis of rotation, changes. This is particularly important for sliding bearing with conical geometry. Due to the geometry of this kind of bearing, i.e. where the radius of this bearing (of the shaft and sleeve) has not a constant value, as in the case of a journal bearing, it is more difficult to obtain proper values and describe its hydrodynamic lubrication. This article shows the results of hydrodynamic lubrication of the slide conical bearing, for which the changes in the position of the bearing shaft in the longitudinal direction, i.e. along its axis of rotation, were taken into account. The commercial CFD software, designed for solving general for flow phenomena problems, was used in the simulations. This article shows the results of simulations, assuming that the lubricating oil behaves as a generalized Newtonian fluid. The hydrodynamic pressure distributions, load carrying capacities and friction torques were calculated for the concerned bearing. The aim of this work is to show how the operating parameters of the slide conical bearing can be influenced, by only changes of the position of the shaft along the axis of its rotation.
Źródło:: Journal of KONES; 2017, 24, 3; 37-44
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: CFD analysis of non-Newtonian and non-isothermal lubrication of hydrodynamic conical bearing
Autorzy:: Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/243876.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: conical bearing
hydrodynamic lubrication
CFD simulation
non-Newtonian oil
non-isothermal flow
pressure distribution
Opis:: In this work is shown the result of CFD simulation of hydrodynamic conical bearing lubrication with consideration of non-isothermal oil flow in a bearing lubrication gap and also with assumption, that oil has non- Newtonian properties. The determination of hydrodynamic pressure distribution in bearing gap was carried out by using the commercial CFD software ANSYS Academic Research for fluid flow phenomenon (Fluent). Calculations were performed for bearings without misalignment, i.e. where the cone generating line of bearing shaft is parallel to the cone generating line of bearing sleeve. The Ostwald-de Waele model for non-Newtonian fluids was adopted in this simulation. The coefficients of Ostwald-de Waele relationship were determined by application of the least squares approximation method and fitting curves described by this model to the experimental data, obtained for some motor oils, presented in previous work. The calculated hydrodynamic pressure distributions were compared with the data obtained for corresponding bearings, but assuming that the flow in the bearing lubrication gap is isothermal. Some other simplifying assumptions are: a steady-state operating conditions of a bearing, incompressible flow of lubricating oil, no slip on bearing surfaces, pressure on the side surfaces of bearing gap is equal to atmospheric pressure. This paper presents results for bearings with different rotational speeds and of different bearing gap heights.
Źródło:: Journal of KONES; 2014, 21, 4; 49-56
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: CFD analysis of pressure distribution in slide conical bearing lubricated with non-Newtonian oil
Autorzy:: Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/241851.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: slide conical bearing
CFD
non-Newtonian oil
pressure distribution
Źródło:: Journal of KONES; 2013, 20, 3; 117-124
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: CFD analysis of the hydrodynamic lubrication of a misaligned, slide conical bearing
Analiza CFD hydrodynamicznego smarowania stożkowego łożyska ślizgowego o nierównoległych osiach czopa i panewki
Autorzy:: Czaban, A.
Powiązania:: https://bibliotekanauki.pl/articles/188596.pdf
Data publikacji:: 2016
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: hydrodynamic lubrication
sliding bearing
conical
misaligned
CFD
non-Newtonian oil
hydrodynamiczne smarowanie
łożysko stożkowe
ślizgowe
nierównoległość osi
nienewtonowski olej
Opis:: The lateral loads carried by hydrodynamic bearings, and also their uneven distribution, introduce an additional axial misalignment between the shaft and sleeve. The machining and mounting errors also result in improper initial alignment of bearing shaft or sleeve. Furthermore, due to vibrations, misalignment of shaft fluctuates during the operation of the bearing. This has an impact on the operating parameters of the bearing, and, in extreme cases, where the maximum allowable value of the misalignment is exceeded, the bearing can be damaged. The aim of this work is to investigate the effect of misalignment on the hydrodynamic pressure distribution in the conical sliding bearing lubrication gap and on the bearing load carrying capacity and friction force values. This paper shows the result of a CFD simulation of hydrodynamic conical bearings lubrication with the assumption that the bearings are misaligned, i.e. where the rotation axis of bearing shaft is not parallel to the axis of the cone of the bearing sleeve. The commercial CFD software ANSYS Fluent was used in this research. It was assumed that the flow of lubricating oil is laminar, without slipping on bearing surfaces, and that the oil has non-Newtonian properties.
Nierównomierny rozkład sił obciążających łożysko ślizgowe, a co za tym idzie – deformacja wału powodują powstawanie nierównoległości pomiędzy osią czopa a osią panewki łożyska. Dodatkowo błędy procesu obróbki lub pomiędzy osią czopa i osią panewki. Położenie osi czopa nie jest stałe podczas pracy łożyska i zmienia się np. w związku z jego drganiami. Celem tej pracy jest zbadanie wpływu nierównoległości osi obrotu czopa w stosunku do osi panewki na rozkład ciśnienia hydrodynamicznego, wartości sił nośnych i na wartość momentu tarcia w stożkowym łożysku ślizgowym. W niniejszej pracy zaprezentowano wyniki symulacji CFD dla stożkowego łożyska ślizgowego przy założeniu, że przepływ oleju w szczelinie smarnej jest laminarny. Założono, że olej jest płynem o właściwościach nienewtonowskich, a zależność naprężeń od szybkości ścinania jest opisana relacją Ostwalda de Waele. Symulacje przeprowadzono dzięki wykorzystaniu komercyjnego oprogramowania CFD Ansys Fluent.
Źródło:: Tribologia; 2016, 268, 4; 41-53
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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