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Skocz do pozycji: 1.

Tytuł:: A study on the adhesion at a micro- and nano-lubrication
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/245327.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: adhesion forces
micro- and nano-lubrication
micro-bearings
Opis:: In this paper describes the study on the adhesion forces at a nano-contact and micro- and at a nano-lubrication. Here are elaborated the dependences between oil dynamic viscosity in super thin boundary layer and adhesion forces as well influences of adhesion forces in micro- and nano-level on the friction forces in micro- and nano-scale arising between two cooperating surfaces in micro-bearings. Up to now the influence of adhesion on oil viscosity changes and on the oil flow in micro-bearing gap was not considered in analytical way. Present paper elaborates the preliminary assumptions of hydrodynamic theory of lubrication for micro-bearing in the case if during the lubrication the adhesion forces are taking into account. In this paper are derived theformulas of pressure distributions, friction forces and friction coefficients where the adhesion forces are considered. The changes of adhesion forces in micro-contact of two bodies dependon the load direction. Load carrying capacity increases implied by the oil dynamic viscosity increases caused by the adhesion and cohesion forces attain about from 20% to 30% in comparison to the viscosity and capacity values in classical form.
Źródło:: Journal of KONES; 2009, 16, 4; 499-506
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Intelligent microbearings project with memory of stress-strain history
Autorzy:: Wierzcholski, K.
Miszczak, A.
Kosowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/241991.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: Curvilinear grooved journals
micro bearing in computer disks
capacity memory simulations
Opis:: Taking into account the increasing need of intelligent micro-bearing with memory, this paper presents the optimization, simulation and practical application of operating parameters(load carrying capacity, friction forces, friction coefficient, wear), simulation for hydrodynamic HDD micro-bearing with curvilinear nano-grooved journal profile. One of the reason of such journal profile is that this journal profile contributes to the variation (an increase or decrease) the memory capacity of HDD drive operating on hydrodynamic micro-bearings. Such properties are very important and required in HDD micro-bearings. A general theory of materials with memory is the theory developed by Noll and Koleman. The simple solid body and liquid theory presented in this paper is based on the assumption that stress is defined by a whole deformation history. The changes of micro-bearing superficial surfaces presented in this paper are described by the process of changes of mass of a body system defined by non-classical intelligent oil and bearing material properties. Scientific problems considered in the paper are focused on comparisons and practical applications of tribological processes, which occur during fluid flow around cells lubrication on the nano-surfaces in bio-bearings as well as surfaces of micro-bearings used in micro-mechanisms. Up to now, the dynamic behaviour of HDD spindle system with fluid micro-bearings was considered by Jang at al. [7]. They simulated an increase in the memory capacity by increase in the bearing width and by application herringbone or spiral grooves on the sleeve and journal surfaces of HDD micro-bearings. After proposal contained in this project it is additionally possible to make capacity memory simulations by the various shapes of micro-bearing journal application.
Źródło:: Journal of KONES; 2008, 15, 4; 583-589
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Adhesion and capilarity in micro-bearing lubrication
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/245795.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: adsorption
adhesion
capillary forces
micro-bearing lubrication
Opis:: Present paper shows the some main phenomena which have important influence on the micro-bearing operating parameters. To above mentioned phenomena belong: adhesion forces, adsorption forces, capillary forces, elastic and hyperelastic deformations of cooperating micro-bearing surfaces, Van-der Waals electrostatic forces on the micro-bearing surfaces. Because the height of super thin micro-bearing gap is very small often smaller than l micrometer, hence the adhesion forces and capillary forces arising in micro-bearing gap, provoke the oil dynamic viscosity changes. This fact leads to the hydrodynamic pressure and bearing carrying capacity changes. The performed research play off the main role of mechanical micro-deformations of cooperating micro-bearing surfaces on non-Newtonian oil dynamic viscosity and here are indicated the influence of capillary force on adhesion forces in micro-scale. The micro-deformations of the micro-bearing gap height are effecting the changes of oil flow velocity in the gap, this fact leads to the share rate changes and therefore we obtain changes of apparent viscosity of the non-Newtonian oil.
Źródło:: Journal of KONES; 2009, 16, 3; 489-495
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Friction forces on the lubricated surfaces in micro and nano scale
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/241987.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: AFM
experimental data
dynamic friction forces
Opis:: The present paper determines static and dynamic friction forces and friction coefficients using atomic force microscope during the hydrodynamic viscoelastic liquid flow in the thin boundary layer around the cells of two cooperating bodies. Atomic force microscope is necessary in performed experimental investigations and measurements of friction forces. Therefore, proper parameters of microscope are described and illustrated in specific enlargement. The use of microscope of atomic forces AFM for complex technical investigations to a large extent has facilitated carrying-out the measurements of tissue surface features and control of its growing process in human joint and deforming process in micro-bearing alloy. During conventional nano-scale measurements of surface topography, the AFM microscope makes it possible to simultaneously map local lateral forces and oscillatory phases of translations, which may be interpreted as a representation of local friction forces and local adhesive forces as well as values of elasticity modules. One of the important advantages of the AFM microscope application in the area of investigations with the use of bio-reactors is the possibility of carrying out measurements directly in liquid, namely that surrounds the cells or micro-bearing gaps
Źródło:: Journal of KONES; 2008, 15, 4; 597-602
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Control contribution for wear bearing recurrence process
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/202072.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: recurrence equations
wear bearing control process
równanie rekurencyjne
procesy kontroli
Opis:: This paper presents the methods of control problem solutions using recurrence equations implementation and UOS transformation for the bearing wear estimation during the finite and infinite time units of an operation process. If we have two wear value increase processes then very important is information which process is divergent more slowly. On the other hand, in comparison with two convergent processes we must decide which process is convergent more quickly. The wear process is determined mostly by the summation factor method. Such a method is applied for the solutions of recurrence equations with variable coefficients.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 691-700
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Measurement of non used microbearing grooved surfaces for computer ventilator Xilence Case Fan
Autorzy:: Wierzcholski, K.
Miszczak, A.
Khudoley, A.
Powiązania:: https://bibliotekanauki.pl/articles/245823.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: computer ventilator Xilence Case Fan
microbearing
grooves
profiles of work surfaces
Opis:: In this paper is presented the measurement analysis of two a new non-damaged cooperating microbearing surfaces occurring in computer ventilator Xilence Case Fan 92mm. Elaborated measurements concern Scanning Electron Microscope (SEM) images of journal and sleeve work surfaces, AFM roughness tests with 3D images of journal and sleeve work surfaces and profiles of their cross sections, Vickers micro-hardness value studies for journal and sleeve surface. Furthermore in researches of the sleeve surface are included measurements for macro-profile surfaces with herringbone grooves micro-profiles of small grooves utilizing and Atomic Force Microscope) AFM - NT-206 Belarus. The measurements are performed for a new non damaged journal and sleeve surface using the AFM and SEM & Micro-X-Ray analysis. Such analysis concerns results referring to the bearing material composition with standard deviation of measured values. The view of cylindrical microbearing journal surfaces with nano-ridges and grooves and measured non used and non damaged surfaces with longitudinal nano-ridges and grooves in cylindrical slide microbearing journal and sleeve; SEM image of work surface of the microbearing journal and microbearing sleeve of computer ventilator Xilence Case Fan, 3D AFM image of work surface of microbearing journal, profile of work surface of the journal, 3D AFM image of work surface of microbearing sleeve of computer ventilator, profile of work surface of the sleeve are presented in the paper.
Źródło:: Journal of KONES; 2011, 18, 2; 471-476
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Measurement of non used microbearing occurring in computer HDD seagate barracuda
Autorzy:: Wierzcholski, K.
Miszczak, A.
Khudoley, A.
Powiązania:: https://bibliotekanauki.pl/articles/242039.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: computer ventilator Xilence Case Fan
microbearing
grooves
profiles of work surfaces
Opis:: In this paper is presented the measurement analysis of two a new non-damaged cooperating microbearing surfaces occurring in computer ventilator Xilence Case Fan 92mm. Elaborated measurements concern Scanning Electron Microscope (SEM) images of journal and sleeve work surfaces, AFM roughness tests with 3D images of journal and sleeve work surfaces and profiles of their cross sections, Vickers micro-hardness value studies for journal and sleeve surface. Furthermore in researches of the sleeve surface are included measurements for macro-profile surfaces with herringbone grooves micro-profiles of small grooves utilizing and Atomic Force Microscope) AFM -NT-206 Belarus. The measurements are performed for a new non damaged journal and sleeve surface using the AFM and SEM & Micro-X-Ray analysis. Such analysis concerns results referring to the bearing material composition with standard deviation of measured values. The view of cylindrical microbearing journal surfaces with nano-ridges and grooves and measured non used and non damaged surfaces with longitudinal nano-ridges and grooves in cylindrical slide microbearing journal and sleeve; SEM image of work surface of the microbearing journal and microbearing sleeve of computer ventilator Xilence Case Fan, 3D AFM image of work surface of microbearing journal, profile of work surface of the journal, 3D AFM image of work surface of microbearing sleeve of computer ventilator, profile of work surface of the sleeve are presented in the paper.
Źródło:: Journal of KONES; 2011, 18, 2; 471-482
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Samooczyszczające się hydrofobowe systemy tribologiczne
Self-cleaning hydrophobic friction systems
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/188012.pdf
Data publikacji:: 2010
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: powierzchnie hydrofobowe
adhezja
samooczyszczanie
hydrophobic surface
anti-adhesion
self-cleaning
Opis:: Procesy adhezyjne lub mechanizmy tribologiczne są interesujące z wielu powodów. Biologiczne mechanizmy kontaktowe pomagają w zrozumieniu zasad funkcjonowania wielu technicznych adhezyjnych urządzeń. Zbadanie biologicznych stykowych powierzchni stało się źródłem rozwoju idei twórczych w zakresie przemysłowych zastosowań powierzchni samo-oczyszczających się. Na przykład powierzchnie samooczyszczające są bardzo pożądane w zbiornikach do magazynowania olejów, smarów, farb. Ponadto powierzchnie lemieszy pługa powinny też posiadać własność samooczyszczania się od pozostałości gleby po orce. Zdolność samooczyszczania powierzchni jest procesem tribologicznym. Powierzchnie hydrofobowe charakteryzują się specyficzną rzeźbą w postaci mikroi nanorowków. W pracy wyjaśniono mechanizm zanieczyszczenia powierzchni tworzony adhezyjnym wiązania nanoobiektów z rozpatrywanymi powierzchniami na skutek sił Van der Waalsa.
Adhesive or sticking tribological mechanisms are interesting in several respects. Biological sticking mechanisms may aid in understandding the principles of the functioning of other technical frictional and adhesive mechanisms. Biological sticking surfaces provide a rich source of ideas for the development of industrial applications, such as self cleaning surfaces. For example, the self-cleaning surfaces are very desirable for the internal surfaces of tanks for lubricants in contact with the oil. The shared surfaces of the plough ought to have self-cleaning properties too. Self cleaning-abilities of the surface are known as the hydrophobic properties. Hydrophobic surfaces have specific sculptured shapes with the nano-ridges and nano-grooves. Particle contaminating surface structures consists, in most cases, of material that is more readily wetted than hydrophobic wax components. Contaminants usually rest on the tips of the surface structures, so that the real contact area between the particles and sculptured surface is minimised. Thus, these particles can be easily removed by water droplets rolling over the surface. In this case, the adhesion between particles and water droplets is greater than between particles and the sculptured surface due to the reduced contact between the particles and surface. Therefore, we have the selfcleaning process of the surface.
Źródło:: Tribologia; 2010, 3; 241-250
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Tribological systems of surfaces with frictional resistance reduction
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/247630.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: nano-ridges
groove geometry
reduced friction
micro-bearing
shark skin
Opis:: In this paper are assumed micro-ridges and micro-grooves on the Journal and bearing sleeve surfaces. Friction on the boundary layer of the body moving in the oil at high Reynolds numbers may be decreased due to such asculpturing of the surface. The grooved scale of the shark skin is an example of such tribological systems. There size ranges of the grooves are from 200 jum to 400/jm. The surface of the each scale contains parallel groove between so-called ribbed directed almost parallel to the longitudinal body axis. An explanation of the shark skin effect has been proposed recently for the micro-bearing surfaces shapes execution. In the boundary layer, not only longitudinal micro-turbulence but also cross-directed micro-turbulence occurs. The longitudinal grooves of the shark and bearing surface prevent the appearance of the cross-directed micro-turbulences. Forces of the streaming oil in bearing or micro-bearing gap act on the bearing surface in two different ways. On one side, the oil generates the pressure directed normally to the surface of the Journal surface and is responsible for inertiaforces. On the other side, friction or shearing force acts tangentially to the bearing surface. The resulting force depends on the geometry of the body, its relative dimensions to the oilflow and on such characteristics of the oil as its density, viscosity and velocity.
Źródło:: Journal of KONES; 2010, 17, 3; 491-496
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Impulsive and periodic class of solutions for hydrodynamic theory of lubrication
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/242922.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: injury solutions
periodic solutions
theory of lubrication
partial differential equations
Opis:: In this paper, two different classes of lubricant flow conditions are basically indicated, i.e. for periodic solutions when pressure values and other flow parameters change periodically and for non-periodic solutions in the case of lubricating in the conditions of impulses and strokes. The Authors formulate the primary problem in the form of a system of 9 nonlinear non-homogeneous partial differential equations with variable and random coefficients in a curvilinear orthogonal system of coordinates which is supplemented with suitable constitutive dependences and conjugated with magnetic field equations with the Ohm equation. These equations include the following: three conservation equations of the lubricating liquid momentum, the stream continuity equation, the energy conservation equation, three equilibrium equations of the thin elastic superficial layer that are reduced to the differential equation in displacements, the heat transfer equation of the superficial layer that is flown around by the lubricating liquid. The following include those equations that describe constitutive dependences the Rivlin-Ericksen equation of physical dependences for viscoelastic ferrofluid, the equation of the physical dependences of the superficial layer of the surfaces lubricated, the equation of the physical dependences of the magnetic field. The unknown values of the material coefficients shall be determined experimentally. The following 9 unknowns are determined from the system of partial differential equations: three velocity components of the lubricating liquid, the hydrodynamic pressure, the temperature in the lubricating liquid, the three components of the superficial layer displacement and the temperature in the superficial layer. The mathematical solution of the problem presented requires a number of boundary conditions to be imposed. The Authors foresee quasi-analytical solutions of the system described of partial differential equations.
Źródło:: Journal of KONES; 2012, 19, 4; 651-658
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Scientific achievements obtained in the project MTKD-CT-2004-517226 in years 2005-2008
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/243524.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: hydrodynamic pressure
hyperelastic human joints
deformable gap
Opis:: The synovial joint has two main components: solid one represented by the cartilage, and bio-fluid by the synovial fluid. The cartilage is a soft anisotropic solid containing pores filled with a fluid. In this paper is determined the pressure distributions in a thin layer of non-Newtonian, lubricant inside the deformable gap of spherical human hip joint. The load carrying capacities in human joints with cartilage deformations are much smaller than that obtained for not deformable cartilage surface. The changes of the joint gap height during the lubrication process are caused by the deformation of two cooperating spherical joint surfaces covered by the soft cartilage superficial layer. Hypo-elastic deformations of cartilage are taken into account. In the general case the cartilage can be subjected to large deformations. The main results described in this paper are as follows: 1.Numerical calculated values of pressure distributions for the elbow cylindrical human joints performed in this paper by virtue of analytical models taking into account the effects of congenial and growth influences on the lubrication process are compared with initial measured hydrodynamic pressure values performed by means of AFM. Measured pressure values obtained by the S. Chizhik et al. 2006 in experimental way, are different about 7 percent from the numerical values obtained in presented paper using the analytical solutions. 2.In presented paper is derived the modified Reynolds equation containing the terms describing the influences of congenial and genetic properties of the lubricant and micro-bearing materials on the pressure and load carrying capacity of bio-joints and micro-bearing. The comparisons presented in this project between human bio-joints and micro-bearings are indicated that the biobearing theory of lubrication is very helpful in MEMS and NEMS devices. The research presented in the project provides an important impact for developing the new scientific domain such as cyto-tribology, histo-tribology or tribology of cells, and tissue and of micro-surfaces occurring in mechanical micro-bearings. According to the participants knowledge such scientific domains are completely new and have been not so far initiated by any scientific centre and in any area of tribology and tissue engineering.
Źródło:: Journal of KONES; 2008, 15, 3; 543-549
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: The project of memory and genetic code simulations for joint lubrication
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/241989.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: Curvilinear bone heads
capacity memory simulations
genetic code of biological liquids
Opis:: This paper presents the optimization, simulation and practical application of operating parameters(load carrying capacity, friction forces, friction coefficient, wear) for hydrodynamic intelligent articular and artificial bio-bearing joints with curvilinear nano-shaped surfaces. One of the reason of such bone head and endoprosthese profile is that this profile contributes to the variation (an increase or decrease) the memory joint capacity. Such properties are very important and required in human joints. A general theory of materials with memory is the theory developed by Noll and Koleman. The simple solid body and liquid theory presented in this paper is based on the assumption that stress is defined by a whole deformation history. The changes of bio-bearing superficial surfaces presented in this paper are described by the process of changes of mass of a body system defined by non-Newtonian synovial liquid properties and its genetic (congenital) factors, which depends on epigenetic (environmental) factors (temperature, mechanical stress and strain, internal and external physical fields, etc.). Scientific problems considered in the paper are mainly focused on comparisons and practical applications of tribological processes, which occur during fluid flow around cells lubrication on the nano-surfaces in nano-bearings, as well as surfaces of bio-bearings.
Źródło:: Journal of KONES; 2008, 15, 4; 591-596
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Friction forces in conical intelligent micro-bearings
Siły tarcia w stożkowych inteligentnych mikrołożyskach
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/190324.pdf
Data publikacji:: 2009
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: mikrołożyska
roboty
pamięć
micro-bearings
robots
memory
Opis:: In this paper is presented the method of friction force calculations in slide conical micro-bearings occurring in HDD computer discs. The authors compare they’re own results with the results that were obtained by the G.H. Jang research team. The considered micro-bearings have intelligent memory features. G.H. Jang attain memory properties through the nano- grooves on the cylindrical micro-bearing surfaces, which implies the whirling motion and whirling flows of the lubricant in the bearing gap. In presented paper, the memory effects are obtained by the conical shapes of the journal and sleeve and additionally by the grooves with which depths of about 25 nm. Such shapes increase and regulates the proper friction force values and whirling motion and therefore increase the bearing memory properties.
Przedmiotem pracy jest wyznaczanie sił tarcia w inteligentnych stożkowych mikrołożyskach HDD z pamięcią, które występują w dyskach komputerowych. Praca niniejsza jest kontynuacją prac autora i jego współpracowników publikowanych w 2007 roku. Autor porównuje wyniki własne z wynikami uzyskanymi w ostatnich dwóch latach przez G.H. Janga, który wraz ze swoim zespołem badawczym uzyskał efekty pamięci występujące w hydrodynamicznych mikrołożyskach ślizgowych wyłącznie poprzez nacięcia rowków o głębokości kilkudziesięciu nanometrów na powierzchniach czopów i panewek o kształtach walcowych, przez co uzyskiwane były odpowiednie przepływy wirowe cieczy smarującej wewnątrz super cienkiej warstewki oleju w szczelinie łożyskowej. Autor zauważył, że niezależnie od nanorowków zwiększone efekty pamięci można uzyskać poprzez odpowiednie modelowanie kształtów powierzchni stożkowej czopa i panewki. Opracowana przez autora teoria smarowania stożkowych kształtów powierzchni nośnych hydrodynamicznych mikrołożysk ślizgowych potwierdza wyniki G.H. Janga. Ponadto w pracy wykazano, że efekty inteligentnych mikrołożysk, polegające na zapamiętywaniu określonych obciążeń w warunkach eksploatacji oraz na odreagowaniu tych obciążeń poprzez wzbudzanie odpowiednich przepływów wirowych, powodowanych kształtem czopa i panewki, dodatkowo zwiększają efekty pamięci prezentowane przez dotychczasowych badaczy, a nawet są, zdaniem autora, bardziej skuteczne aniżeli w przypadkach badań G.H. Janga.
Źródło:: Tribologia; 2009, 4; 259-266
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Differential and recurrence unified reynolds equations and mega algorithm for their numerical solutions
Autorzy:: Wierzcholski, K.
Miszczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/242919.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: partial differential form
partial recurrence form
unified Reynolds equation
mega algorithm
Opis:: The objective of the research under the paper topic is an analytical, unified formulation of a new standardized view of general solution of hydrodynamic problem using algorithm to determine changes of the components of the velocity vector, the distributions of hydrodynamic pressure, load carrying capacity, of slide bearings with cooperating curvilinear, orthogonal surfaces that are lubricated with a various non-Newtonian lubricants. In this paper for non- Newtonian lubricants are questioning the hitherto prevailing assumptions using in hydrodynamic theory of lubrication such as constant value of lubricant viscosity and pressure in the thickness of lubricating gap i.e. in gap height direction. Finally, the non-homogeneous partial differential equation generated with variable coefficients that is the result of the various boundary conditions being imposed that are different for each problem solved is an equation that determines the distributions of hydrodynamic pressure values. This equation is to be written in the form of a unified non-homogenous partial recurrence equation with variable coefficients. The Authors foresee that a mega-algorithm will be developed for the solution of this equation in a numerical form. This equation in particular cases is an equivalent of modified Reynolds equations in the research that has been conducted so far concerning the hydrodynamic theory of lubrication.
Źródło:: Journal of KONES; 2012, 19, 4; 643-650
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: A method of the wear prognosis of sliding bearings
Metoda prognozowania zużycia łożyska ślizgowego z wykorzystaniem komputera
Autorzy:: Miszczak, A.
Wierzcholski, K.
Powiązania:: https://bibliotekanauki.pl/articles/140225.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: slide bearings surfaces
wear prognosis
recurrence equations
computational analysis
powierzchnie łożysk ślizgowych
prognoza zużycia
równanie rekurencyjne
analiza komputerowa
Opis:: The considerations presented in this paper include a computer analysis of slide bearing wear prognosis using the solutions of recurrence equations complemented with the experimental data values. On the ground of the results obtained from analytical and computational numerical calculations, and taking into account the experimental parameters of bearing material and operation boundary conditions, the control problems of slide bearing wear surfaces have been presented. The obtained results allow us to see a connection between roughness, material properties, the amplitude of vibrations, the kind of the friction forces, the hardness of materials, the sliding speed in one side and the wear increments in succeeding time units of the exploitation process in other side.
Rozważania przedstawione w niniejszej pracy obejmują komputerową analizę prognozy zużycia łożyska ślizgowego z wykorzystaniem rozwiązań równań rekurencyjnych oraz danych eksperymentalnych. Problem optymalizacji zużycia powierzchni ślizgowych łożyska został rozwiązany przy wykorzystaniu obliczeń analitycznych i numerycznych a także przy uwzględnieniu materiału łożyskowego, parametrów doświadczalnych oraz warunków brzegowych. Uzyskane wyniki pozwalają nam dostrzec związek między chropowatością, właściwościami materiału, amplitudą drgań, rodzajem sił tarcia, twardością materiałów, prędkością ślizgania z jednej strony, a przyrostem zużycia w kolejnych jednostkach czasowych procesu eksploatacji z drugiej strony.
Źródło:: Archive of Mechanical Engineering; 2014, LXI, 4; 553-570
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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