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  • 1. Almqvist, Andreas
    et al.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Larsson, Roland
    Marklund, Pär
    Sahlin, Fredrik
    Dasht, Johan
    Persson, Lars-Erik
    Wall, Peter
    Homogenization of Reynolds equation2005Report (Other academic)
  • 2. Almqvist, Andreas
    et al.
    Sahlin, Fredrik
    Larsson, Roland
    Glavatskikh, Sergei
    Luleå University of Technology, Division of Machine Elements.
    On the dry elasto-plastic contact of nominally flat surfaces2007In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 40, no 4, p. 574-579Article in journal (Refereed)
    Abstract [en]

    A model to be used for numerical simulation of the contact of linear elastic perfectly plastic rough surfaces was developed. Energy dissipation due to plastic deformation is taken into account. Spectral theory and an FFT-techique are used to facilitate the numerical solution process. Results of simulations using four two-dimensional profiles with different topographies in contact with a rigid plane for a number loads are reported. From the results it is clear that the real area of contact (Ar) changes almost linearly with load and is only slightly affected by the difference in topography. A plasticity index is defined as the ratio of plastically deformed area (Ap) and Ar. Plastic deformation occurs even at low loads and there is a significant difference in plasticity index between the surface profiles considered. An investigation on how the spectral content of the surface profile influences the results presented is also performed. This is to ensure that the metrological limitations of the optical profilerused to measure the surfaces do not have a significant influence. It is concluded that the highest frequencies of the measured profile have a negligible influence on the real area of contact.

  • 3. Antzutkin, O. N.
    et al.
    Shah, F. U.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Ionic-liquid-based lubricants and lubrication additives comprising ions2011Patent (Other (popular science, discussion, etc.))
  • 4. Cervantes, Michel
    et al.
    Aidanpää, Jan-Olov
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Karlsson, Thommy
    Group dynamics [hydro power equipment]2005In: International Water Power and Dam Construction, ISSN 0306-400X, Vol. 57, no 12, p. 40-45Article in journal (Other academic)
    Abstract [en]

    An interdisciplinary research group was created at the Lulea University of Technology in Sweden to help develop world leading competencies and knowledge for cutting-edge technologies in hydro power generation. Based on the studies of this Swedish research group, this paper provides a description of the power system from a dynamic point of view to obtain an overall picture, and is completed with a detailed description of the bearings and turbines. The state-of-the-art in each field is presented, together with suggestions for further development

  • 5. Cervantes, Michel
    et al.
    Aidanpää, Jan-Olov
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Karlsson, Thommy
    Interdisciplinary research in full-scale hydropower machines at Porjus, Jokkmokk, Sweden2005In: International Water Power and Dam Construction, ISSN 0306-400X, Vol. 57, no 12, p. 40-44Article in journal (Other academic)
  • 6. Cervantes, Michel
    et al.
    Jansson, Ida
    Jourak, Amir
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Aidanpää, Jan-Olov
    Porjus U9A full-scale hydropower research facility2008In: Hydro technology and the evironment for the new century: 24th IAHR Symposium on Hydraulic Machinery and Systems, 2008Conference paper (Refereed)
    Abstract [en]

    Hydropower still faces complex scientific and technical challenges in order to secure the availability and reliability of the power plants despite more than a century of development. The main challenge is due to new market constrains such as electrical market deregulation and introduction of renewable sources of energy. The major problem is related to the dynamic of the rotor involving several fields: hydraulics, power engineering and mechanics. On the other side, the large and growing hydropower world market represents an opportunity for technically advanced companies offering better efficiency. The difficulty to scale rigorously any technical advance makes full-scale experiment a necessity. World unique facilities are available at Porjus, Sweden, for this purpose. The Porjus Hydropower Centre is composed of a Francis (U8) and a Kaplan (U9) turbine of 10 MW, each exclusively dedicated to education, research and development. In order to further investigate specific issues related to availability and reliability, a project was initiated in 2006. The main objective is to make U9 a full-scale hydropower laboratory able firstly to furnish the necessary data for the development of rotor-dynamic models but also turbines and bearings. To this purposes more than 200 sensors have been installed to measure displacements, forces, pressure, film thickness, strains... The work presents an overview of the newly upgrade facility as well as some of the problems faced during the instrumentation of the machine.

  • 7.
    Cha, Matthew
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Journal vibration: Influence of compliant bearing design2012In: Proceedings Of The ASME 11th Biennial Conference On Engineering Systems Design And Analysis, Vol 4, 2012, p. 657-664Conference paper (Refereed)
    Abstract [en]

    In this paper, the nonlinear dynamic behaviour of vertical and horizontal rotors in compliant tilting pad journal bearings has been investigated. White metal and compliant bearings with line pivot pads are compared. The dynamic response of four pad bearings with different preload factors is studied. The effect of viscoelasticity is also considered in comparison with purely elastic compliant and white metal liners. The influence of radial clearance and pad offset is analysed. It is shown how pad design parameters such as preload factor, pivot offset, viscoelasticity of the liner, and radial clearance can be selected to control the size of the journal orbit in compliant bearings.

  • 8.
    Cha, Matthew
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.). Waukesha Bearings, United Kingdom .
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.). Ghent University, Belgium .
    Misalignment effects in journal bearings with compliant liner tilting padsManuscript (preprint) (Other academic)
  • 9.
    Cha, Matthew
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.). Waukesha Bearings, United Kingdom .
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.). Ghent University, Belgium .
    Nonlinear dynamic behaviour of vertical and horizontal rotors in compliant liner tilting pad journal bearings: Some design considerations2015In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 82, p. 142-152Article in journal (Refereed)
    Abstract [en]

    Dynamic behaviour of vertical and horizontal rotors in journal bearings with line pivot pads is investigated. Two bearing designs are compared: one with white metal pads and another with compliant liner pads. The influence of elasticity of the liner on the journal orbits is investigated. Some practical aspects of the compliant liner pad design are discussed. Compliant bearing design parameters such as preload factor, pivot offset, radial clearance, viscoelasticity, and pad inclination to control the size of the journal orbit are considered.

  • 10.
    Cha, Matthew
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Nonlinear Dynamic Response of Compliant Journal Bearings2012In: CSNDD 2012 – International Conference on Structural Nonlinear Dynamics and Diagnosis, EDP Sciences, 2012, p. 10005-Conference paper (Refereed)
    Abstract [en]

    This paper investigates the dynamic response of the compliant tilting pad journal bearings subjected to synchronous excitation. Bearing compliance is affected by the properties of pad liner and pad support geometry. Different unbalance eccentricities are considered. It is shown that bearing dynamic response is non-linear. Journal orbit complexity increases with pad compliance though the orbit amplitudes are marginally affected at low loads. At high loads, the journal is forced to operate outside the bearing clearance. The polymer liner reduces the maximum oil film pressure by a factor of 2 when compared to the white metal liner. The nonlinear dynamic response of compliant tilting pad journal bearings is thoroughly discussed.

  • 11.
    Cha, Matthew
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Isaksson, Patrik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Influence of pad compliance on nonlinear dynamic characteristics of tilting pad journal bearings2013In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 57, p. 46-53Article in journal (Refereed)
    Abstract [en]

    The effect of pad compliance on the dynamic response of tilting pad journal bearings is investigated. Pad compliance is varied by changing pivot geometry and Young's modulus of pad backing and pad liner. Two pad support configurations are considered: one that allows only circumferential tilt and another one that allows both circumferential and axial tilts. Journal orbits, oil film pressure and oil film thickness are compared and discussed. It is shown that higher pad backing compliance significantly increases the journal orbit size and results in an increase in oil film pressure while oil film thickness is decreased. With a compliant liner, oil film pressure is decreased while oil film thickness is increased. Tapers at the pad edges are essential to increase the global minimum oil film thickness in compliant liner bearings.

  • 12.
    Cha, Matthew
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Kuznetsov, Evgeny
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    A comparative linear and nonlinear dynamic analysis of compliant cylindrical journal bearings2013In: Mechanism and machine theory, ISSN 0094-114X, E-ISSN 1873-3999, Vol. 64, p. 80-92Article in journal (Refereed)
    Abstract [en]

    Dynamic behaviour of compliant cylindrical journal bearings is investigated using linear and nonlinear numerical approaches. Journal motion orbits based on linearized dynamic coefficients are compared to the journal trajectories obtained by the nonlinear transient analysis. Obtained results are presented in terms of orbit amplitude, shape and location. The influence of compliant liner thickness, viscoelastic properties and deformation model is also investigated. A linear model is found to deliver acceptable results at a relatively small shaft unbalance under low to average loads. However, with a journal amplitude motion greater than 37% of the bearing diametral clearance, the linear model should not be used to analyse journal transient motion. Plane strain hypothesis is found to be a proper substitute for a full deformation model when a compliant liner is thinner than 2 mm (for the bearing geometry used in this study). It was also shown that the liner viscoelasticity should be taken into account whenever a compliant liner is relatively thick (in our case, 2 mm). Viscoelasticity of the liner decreases journal amplitude compared to a pure elastic liner.

  • 13.
    Cha, Matthew
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.). Waukesha Bearings, United Kingdom .
    Santos, Ilmar
    Technical University of Denmark, Denmark.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.). Ghent University, Belgium .
    Dynamic characteristics of polymers related to compliant bearing desigManuscript (preprint) (Other academic)
  • 14. Cupillard, S.
    et al.
    Cervantes, M. J.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Thermohydrodynamic analysis of a journal bearing with a microgroove on the shaft2014In: Computational Thermal Sciences, ISSN 1940-2503, E-ISSN 1940-2554, Vol. 6, no 1, p. 47-57Article in journal (Refereed)
    Abstract [en]

    In this study, thermohydrodynamic performance of a journal bearing with a microgroove created on the shaft is analyzed. A plain journal bearing is modeled using a computational fluid dynamics (CFD) software package. Navier-Stokes and energy equations are solved. The rotor-stator interaction is treated by using a computational grid deformation technique. The goal is to examine the pressure/temperature distribution in the bearing film. Results are presented in terms of typical bearing parameters as well as flow patterns. Results are also compared to the bearing with a smooth shaft. The effect induced by a microgroove on pressure distribution is explained for different bearing configurations, eccentricities, and microgroove depths. It is shown that the microgroove produces a local drop in pressure which, averaged over one revolution, decreases the load carrying capacity. The load carrying capacity is further decreased by using deeper microgrooves. With thermal effects considered, the microgroove carries more cold lubricant into the warmest regions of the bearing. This effect, more pronounced with deeper microgrooves, is due to a global flow recirculation inside the microgroove, which improves mixing.

  • 15. Cupillard, Samuel
    et al.
    Cervantes, Michel
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    A CFD study of a finite textured journal bearing2008In: Hydro technology and the evironment for the new century: 24th IAHR Symposium on Hydraulic Machinery and Systems, 2008Conference paper (Refereed)
    Abstract [en]

    An analysis of a lubricated journal bearing is performed with special attention to the influence of textured surfaces which may improve hydrodynamic performance. The bearing is subjected to an external applied load and the force balance is fulfilled with the force of the flow acting on the bearing. The position of the shaft is fixed whereas the bearing, centred at the starting time, moves under the forces until equilibrium is reached. A mesh deformation technique is used with CFD (Computational Fluid Dynamics) in order to perform the simulations. The flow is laminar, isothermal, three-dimensional (3D) and unsteady. Cavitation is taken into account. Results are analysed with smooth and textured surfaces on the bearing. Friction force and eccentricity ratio are compared for different configurations. It is found that shallow grooves under light loading (ε < 0.15) enhance the minimum film thickness while reducing the friction force. Under high loading (ε > 0.5), deep grooves are able to reduce the friction forcedespite a reduced minimum film thickness. For the second case, the predicted performance is superior to those of a smooth journal bearing with thinner lubricant.

  • 16. Cupillard, Samuel
    et al.
    Cervantes, Michel
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Pressure buildup mechanism in a textured inlet of a hydrodynamic contact2008In: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 130, no 2, p. 1-10Article in journal (Refereed)
    Abstract [en]

    A flow analysis is carried out for an inclined slider bearing with the aim of showing the governing mechanism at conditions where an optimum in load carrying capacity is achieved. The effects of surface texture on pressure buildup and load carrying capacity are explained for a textured slider bearing geometry. Numerical simulations are performed for laminar, steady, and isothermal flows. The energy transferred to the fluid from the moving wall is converted into pressure in the initial part of the converging contact and into losses in the second part. The convergence ratio can be increased, in order to get the greatest pressure gradient, until the limiting value where flow recirculation begins to occur. The texture appears to achieve its maximum efficiency when its depth is such that the velocity profile is stretched at its maximum extent without incurring incoming recirculating flow. The wall profile shape controlling the velocity profile can be optimized for many hydrodynamic contacts.

  • 17. Cupillard, Samuel
    et al.
    Cervantes, Michel
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Pressure build-up mechanism in a textured inlet of a slider bearing2007In: Svenska Mekanikdagar 2007: Program och abstracts / [ed] Niklas Davidsson, Elianne Wassvik, 2007, Vol. 33, p. 33-Conference paper (Refereed)
    Abstract [en]

    A computational fluid dynamics (CFD) analysisis performed on a lubricated textured contactin order to study performance of texturedsurfaces. The work encompasses simulations of aslider bearing with dimples. The bearing is modelledwith a two-dimensional geometry. The fullNavier-Stokes equations are solved under steadystate conditions for a laminar and isothermalflow. The results are presented and the surfacetexture effects are analysed.

  • 18. Cupillard, Samuel
    et al.
    Cervantes, Michel
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Thermohydrodynamic analysis of a journal bearing with a microgroove on the shaft2011Conference paper (Refereed)
    Abstract [en]

    In this study, thermohydrodynamic performance of a journal bearing with a microgroove created on the shaft is analysed. A plain journal bearing is modelled using a computational fluid dynamics (CFD) software package. Navier-Stokes and energy equations are solved. The rotor-stator interaction is treated by using a computational grid deformation technique. Results are presented in terms of typical bearing parameters as well as flow patterns. Results are also compared to the bearing with a smooth shaft. The effect induced by a microgroove on pressure distribution is explained for different bearing configurations, eccentricities and microgroove depths. It is shown that the microgroove produces a local drop in pressure which, averaged over one revolution, decreases the load carrying capacity. The load carrying capacity is further decreased by using deeper microgrooves. With thermal effects considered, the microgroove carries more cold lubricant into the warmest regions of the bearing. This effect, more pronounced with deeper microgrooves, is due to a global flow recirculation inside the microgroove, which improve mixing.

  • 19. Cupillard, Samuel
    et al.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Cervantes, Michel
    3D thermodynamic analysis of a textured slider2008In: Proceedings of NORDTRIB 2008: 13th Nordic Symposium on Tribology / [ed] Jaakko Kleemola, Arto Lehtovaara, 2008Conference paper (Refereed)
    Abstract [en]

    Analysis of a 3D inlet textured slider bearing with a temperature dependent fluid is performed. Numerical simulations are carried out for a laminar and steady flow. Hot and cold lubricant mixing in the groove is modelled and examined for different operating conditions. Thermohydrodynamic performance of the bearing is analysed for different texture lengths. Results show that texture has a stronger and positive influence on load carrying capacity when thermal effects are considered. This beneficial effect is at a maximum for the longest dimples with a length shorter than the pad length. Texture is also beneficial for the load carrying capacity when the sliding speed and inlet flow rate are varied: with an appropriate supply mass flow, load carrying capacity can be increased by 6-7% at low sliding speeds.

  • 20. Cupillard, Samuel
    et al.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Cervantes, Michel
    3D thermohydrodynamic analysis of a textured slider2009In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 42, no 10, p. 1487-1495Article in journal (Refereed)
    Abstract [en]

    Analysis of a 3D inlet textured slider bearing with a temperature dependent fluid is performed. Numerical simulations are carried out for a laminar and steady flow. Hot and cold lubricant mixing in the groove is modelled and examined for different operating conditions. Thermohydrodynamic performance of the bearing is analysed for different texture lengths. Results show that texture has a stronger and positive influence on load carrying capacity when thermal effects are considered. This beneficial effect is at a maximum for the longest dimples with a length shorter than the pad length. Texture is also beneficial for the load carrying capacity when the sliding speed and inlet flow rate are varied. The load carrying capacity of the slider can be increased by up to 16% in severe operating conditions (high sliding speed).

  • 21. Cupillard, Samuel
    et al.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Cervantes, Michel
    Computational fluid dynamics analysis of a journal bearing with surface texturing2008In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 222, no 2, p. 97-107Article in journal (Refereed)
    Abstract [en]

    An analysis of a lubricated conformal contact is carried out to study the effect of surface texture on bearing friction and load carrying capacity using computational fluid dynamics. The work focuses on a journal bearing with several dimples. Two- and three-dimensional bearing geometries are considered. The full Navier-Stokes equations are solved under steady-state conditions with a multi-phase flow cavitation model. The coefficient of friction can be reduced if a texture of suitable geometry is introduced. This can be achieved either in the region of maximum hydrodynamic pressure for a bearing with high eccentricity ratio or just downstream of the maximum film for a bearing with low eccentricity ratio. An additional pressure build-up produced as a result of the surface texture has been shown at low eccentricity ratios.

  • 22. Cupillard, Samuel
    et al.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Cervantes, Michel
    Effect of surface texturing on journal bearing performance2006In: ASIATRIB 2006: Proceedings of the third Asia International Conference on Tribology, 2006Conference paper (Refereed)
  • 23. Cupillard, Samuel
    et al.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Cervantes, Michel
    Inertia effects in textured hydrodynamic contacts2010In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 224, no 8, p. 751-756Article in journal (Refereed)
    Abstract [en]

    A flow analysis is carried out for a parallel textured slider to investigate the role of fluid inertia. Numerical simulations are performed for a laminar, two-dimensional, steady and isothermal flow. Stokes solutions are compared with Navier-Stokes solutions at the same Reynolds number. A range of texture depths is analysed. It is shown that there is an optimum value of texture depth that provides maximum load-carrying capacity. It is also shown that there is a critical depth value. Inertia has a negative effect on the load-carrying capacity for depths higher than the critical value, whereas it has a positive effect for lower depths. For a given texture depth, these effects are amplified as the Reynolds number increases. The global effect of inertia is positive when a realistic configuration of a parallel textured slider with a fore-region is considered.

  • 24. Cupillard, Samuel
    et al.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Cervantes, Michel
    Thermal analysis of lubricant flow in a textured inlet contact2008In: Proceedings of the 19th International Symposium on Transport Phenomena (ISTP-19), 2008Conference paper (Refereed)
    Abstract [en]

    Performance of an inlet textured contact is analysed for a temperature dependent lubricant flow. Thermal effects are analysed for different shear rates. Shearing of lubricant and subsequent heating reduce load carrying capacity and frictional losses compared with isothermal conditions. Load carrying capacity of a parallel surface contact can be improved by using texturing at the inlet when thermal effects are considered. It is also shown that for the different convergence ratios considered, the texture enables the sustaining of a load until a certain critical shear rate is reached. This critical shear rate depends on a number of factors such as the convergence ratio and lubricant parameters including the viscosity-temperature coefficient and the dynamic viscosity at reference temperature.

  • 25. Delgad, Y. P.
    et al.
    Staia, M.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). Ghent University, Belgium.
    Bonny, K.
    Malek, O.
    Lauwers, B.
    Vleugels, J.
    De Baets, P.
    Friction and wear characteristics of advanced ceramic materials2014In: 5th World Tribology Congress, WTC 2013, 2014, p. 2171-2174Conference paper (Refereed)
  • 26. Delgado, Y. P.
    et al.
    Staia, M.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Bonny, K.
    Malek, O.
    Lauwers, B.
    Vleugels, J.
    De Baets, P.
    High temperature friction response of PECS TiB2-B4C composite2014In: 5th World Tribology Congress, WTC 2013, 2014, p. 2189-2192Conference paper (Refereed)
  • 27. Filippov, A.
    et al.
    Gnezdilov, O. I.
    Hjalmarsson, Nicklas
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
    Antzutkin, O. N.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM). Ghent University, Belgium.
    Furó, Istvan
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Rutland, Mark W.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. RISE Technical Research Institute of Sweden.
    Acceleration of diffusion in ethylammonium nitrate ionic liquid confined between parallel glass plates2017In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 38, p. 25853-25858Article in journal (Refereed)
    Abstract [en]

    Diffusion of EAN confined between polar glass plates separated by a few micrometers is higher by a factor of ca. 2 as compared to bulk values. Formation of a new phase, different to the bulk, was suggested.

  • 28. Filippov, A.
    et al.
    Shah, F. U.
    Taher, M.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
    Antzutkin, O. N.
    NMR self-diffusion study of a phosphonium bis(mandelato)borate ionic liquid2013In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 15, no 23, p. 9281-9287Article in journal (Refereed)
    Abstract [en]

    Newly synthesised halogen-free boron based ionic liquids (hf-BILs) composed of chelated orthoborate anions and phosphonium cations have hydrolytic stability, low melting point and outstanding wear and friction reducing properties. We report here the peculiarities of self-diffusion in one representative from this class, trihexyltetradecylphosphonium bis(mandelato)borate, [P6,6,6,14][BMB], in the temperature range of its practical interest, 20-100 °C. NMR techniques demonstrated complicated diffusional behaviour-the ionic liquid can exist in one or two liquid "phases". In the low-temperature range (20-50 °C), two phases coexist where the cations, [P6,6,6,14], are contained mainly in the phase with slower diffusion coefficients while the anions, [BMB], are in the phase with faster diffusion coefficients. Cations have lower diffusion coefficients with a factor of 20 as compared with the anions, an effect which is caused by aggregation of cations into domains due to so-called "hydrophobic interaction" of their hydrocarbon chains. As the temperature rises above 60 °C, the two phases merge into one where both ions have equal diffusion coefficients. This is caused by thermal motion making the cation domains smaller in size and more easily interacting with anions. As a result, anions and cations diffuse in this high-temperature range as a pair.

  • 29. Filippov, Andrei
    et al.
    Azancheev, Nail
    Shah, Faiz Ullah
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM).
    Antzutkin, Oleg N.
    Self-diffusion of phosphonium Bis(Salicylato)Borate ionic liquid in pores of Vycor porous glass2016In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 230, p. 128-134Article in journal (Refereed)
    Abstract [en]

    H-1 NMR pulsed field gradient was used to study self-diffusion of a phosphonium bis(salicylato)borate ionic liquid ([P6,6,6,14][BScB]) in the pores of Vycor porous glass at 296 K. Confinement in pores increases diffusion coefficients of the ions by a factor of 35. However, some [P6,6,634][BScB] ions demonstrated apparent diffusion coefficients much lower than their mean values, which may be due to partially restricted diffusion of the ions. We suggest that this fraction corresponds to areas where ions are confined by pore 'necks' (micropores) and empty voids. Heating of the ionic liquid/Vycor system at 330 K led to a change in the diffusivity of the ions, because of their redistribution in the pores. The size of the bounded regions is on the order of 1 mu m, as estimated from the dependence of the ion diffusivity on the diffusion time.

  • 30. Filippov, Andrei
    et al.
    Azancheev, Nail
    Taher, Mamoun
    Shah, Faiz Ullah
    Rabet, Pauline
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM). Univ Ghent, Dept Mech Construct & Prod.
    Antzutkin, Oleg N.
    Self-diffusion and interactions in mixtures of imidazolium bis(mandelato)borate ionic liquids with polyethylene glycol: H-1 NMR study2015In: Magnetic Resonance in Chemistry, ISSN 0749-1581, E-ISSN 1097-458X, Vol. 53, no 7, p. 493-497Article in journal (Refereed)
    Abstract [en]

    We used H-1 nuclear magnetic resonance pulsed-field gradient to study the self-diffusion of polyethylene glycol (PEG) and ions in a mixture of PEG and imidazolium bis(mandelato)borate ionic liquids (ILs) at IL concentrations from 0 to 10 wt% and temperatures from 295 to 370 K. PEG behaves as a solvent for these ILs, allowing observation of separate lines in H-1 NMR spectra assigned to the cation and anion as well as to PEG. The diffusion coefficients of PEG, as well as the imidazolium cation and bis(mandelato) borate (BMB) anion, differ under all experimental conditions tested. This demonstrates that the IL in the mixture is present in at least a partially dissociated state, while the lifetimes of the associated states of the ions and ions with PEG are less than similar to 30ms. Generally, increasing the concentration of the IL leads to a decrease in the diffusion coefficients of PEG and both ions. The diffusion coefficient of the anion is less than that of the cation; the molecular mass dependence of diffusion of ions can be described by the Stokes-Einstein model. NMR chemical shift alteration analysis showed that the presence of PEG changes mainly the chemical shifts of protons belonging to imidazole ring of the cation, while chemical shifts of protons of anions and PEG remain unchanged. This demonstrated that the imidazolium cation interacts mainly with PEG, which most probably occurs through the oxygen of PEG and the imidazole ring. The BMB anion does not strongly interact with PEG, but it may be indirectly affected by PEG through interaction with the cation, which directly interacts with PEG. Copyright (C) 2015 John Wiley & Sons, Ltd.

  • 31. Filippov, Andrei
    et al.
    Gnezdilov, Oleg I.
    Hjalmarsson, Nicklas
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
    Antzutkin, Oleg N.
    Glavatskih, Sergei
    Furo, Istvan
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Rutland, Mark W.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
    Acceleration of diffusion in ethylammonium nitrate ionic liquid confined between parallel glass plates2017In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 38, p. 25853-25858Article in journal (Refereed)
  • 32. Filippov, Andrei
    et al.
    Taher, Mamoun
    Shah, Faiz Ullah
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). Ghent University, Belgium .
    Antzutkin, Oleg N.
    The effect of the cation alkyl chain length on density and diffusion in dialkylpyrrolidinium bis(mandelato)borate ionic liquids2014In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 16, no 48, p. 26798-26805Article in journal (Refereed)
    Abstract [en]

    The physicochemical properties of ionic liquids are strongly affected by the selective combination of the cations and anions comprising the ionic liquid. In particular, the length of the alkyl chains of ions has a clear influence on the ionic liquid's performance. In this paper, we study the self-diffusion of ions in a series of halogen-free boron-based ionic liquids (hf-BILs) containing bis(mandelato)borate anions and dialkylpyrrolidinium cations with long alkyl chains CnH2n+1 with n from 4 to 14 within a temperature range of 293-373 K. It was found that the hf-BILs with n = 4-7 have very similar diffusion coefficients, while hf-BILs with n = 10-14 exhibit two liquid sub-phases in almost the entire temperature range studied (293-353 K). Both liquid sub-phases differ in their diffusion coefficients, while values of the slower diffusion coefficients are close to those of hf-BILs with shorter alkyl chains. To explain the particular dependence of diffusion on the alkyl chain length, we examined the densities of the hf-BILs studied here. It was shown that the dependence of the density on the number of CH2 groups in long alkyl chains of cations can be accurately described using a "mosaic type'' model, where regions of long alkyl chains of cations (named 'aliphatic' regions) and the residual chemical moieties in both cations and anions (named 'ionic' regions) give additive contributions. Changes in density due to an increase in temperature and the number of CH2 groups in the long alkyl chains of cations are determined predominantly by changes in the free volume of the 'ionic' regions, while 'aliphatic' regions are already highly compressed by van der Waals forces, which results in only infinitesimal changes in their free volumes with temperature.

  • 33. Fillon, M.
    et al.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    PTFE-faced centre pivot thrust pad bearings factors affecting TEHD performance2008In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 41, no 12, p. 1219-1225Article in journal (Refereed)
    Abstract [en]

    The paper presents a thermoelastohydrodynamic (TEHD) analysis of thrust bearings with polytetrafluoroethylene (PTFE) faced pads. The influence of pad active surface geometry on main characteristics such as temperature profile, film thickness and pressure field are investigated. Due to the high compliance of the PTFE layer, deformations of the active surface due to pressure are quite large and have to be taken into account. The initial geometry of the pad is also of great importance; a parametric study on the pad geometry permits clarification of both geometry and deformation effects. The geometry of the pad, particularly for centrally pivoted pads, has to be considered in order to accurately predict performance of PTFE-faced tilting-pad thrust bearings.

  • 34.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    A method of temperature monitoring in fluid film bearings2004In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 37, no 2, p. 143-148Article in journal (Refereed)
    Abstract [en]

    In the present paper a method to improve temperature monitoring of fluid film bearings is described. The method is tested in an industrial tilting pad thrust bearing. Test results for steady state and transient operating conditions are reported. Temperatures monitored by a thermocouple through the utilisation of the proposed method are compared to those measured by thermocouples in the pad backing and in the collar. The method is also tested on a PTFE-faced bearing. Test results show that the proposed method improves sensitivity to thermal transients in conventional babbitted bearings and provides adequate means of temperature monitoring in the PTFE-faced bearings.

  • 35.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Field performance of heavily loaded thrust bearings with PTFE faced pads2008In: Conference proceedings, STLE annual meeting & exhibition: May 18 - 22, 2008, Cleveland, OH, 2008Conference paper (Refereed)
    Abstract [en]

    This paper reports results from the field tests of PTFE (polytetrafluoroethylene) faced thrust bearings operating at heavy loads. The PTFE composite bearing technology allows significant improvements in sliding bearing performance. Traditional white metal coating is substituted by a layer of PTFE composite. There are several advantages of using PTFE composites as a pad facing material, especially for hydroelectric equipment subjected to severe operating conditions. PTFE has a thermal conductivity about 170 times lower than that of white metal. Introduction of a thermal barrier, a layer of PTFE, between the oil film and pad backing reduces pad thermal deflection and, consequently, increases bearing load carrying capacity. Elasticity of the PTFE layer helps in adjusting the oil film shape in such a way that the bearings can carry higher loads. This paper also presents some temperature and oil film data for a bearing operating at a specific load of 11 MPa. The bearing was in operation 20 years. No significant signs of damage were observed when the bearing was dismantled in 2006.

  • 36.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Hydrodynamic bearings with improved performance and reliability, Part III: Influence of lubricant type2004Report (Other academic)
    Abstract [en]

    This report is a continuation of the work reported earlier that was aimed to assess the feasibility of replacing the mineral oil in hydro power plants with a more environmentally acceptable fluid. Those studies examined the differences between mineral and synthetic oils in terms of maximum operating temperature, minimum oil film thickness and power loss in a tilting-pad thrust bearing with an outer diameter of 228.6 mm operating in a fully flooded mode. Test data and theoretical results showed that the ester base oil performed better than the traditionally used VG68 mineral oil. In the present paper further performance comparisons between this environmentally adapted ester base oil and VG68 mineral oil, this time in a full scale thrust bearing of a hydro power plant, are reported. Again, a complete set of bearing performance parameters is recorded. Recorded data that include temperature, oil-film thickness and power loss are presented and analysed. It is shown that the environmentally adapted ester base oil significantly improves bearing operating characteristics.

  • 37.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM).
    Novel materials in fluid film bearing design2015In: M2D2015: Proceedings of the 6th international conference on mechanics and materials in design, INEGI-FEUP , 2015, p. 2275-2276Conference paper (Refereed)
    Abstract [en]

    This work shows how the use of novel materials, such as polymer composites and synthetic lubricants, in bearing design significantly improves bearing performance characteristics. Different bearing designs are considered. Improvements in main bearing performance characteristics, such as temperature, lubricant film thickness, load carrying capacity and power loss are presented. The effect of such design modifications on the bearing dynamic characteristics is considered. It is also shown that this approach allows a 50 % reduction in bearing power loss without sacrificing bearing safety.

  • 38.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Performance of environmentally adapted oils in hydropower applications2006In: 13th international conference Hydro 2006: Proceedings, 2006Conference paper (Refereed)
  • 39.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Some design modifications enhancing thrust pad bearing operation2004In: Extended abstracts, proceedings: 10th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, 2004Conference paper (Refereed)
  • 40.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Surface structure effects on hydrodynamic bearing lubrication2004In: Improvement of bearing performance under severe operating conditions: 3rd EDF/LMS Poitiers Workshop FUTUROSCOPE, 2004Conference paper (Refereed)
    Abstract [en]

    In bearings a hydrodynamic oil film separates stationary and moving surfaces reducing friction and eliminating wear. This separation is achieved due to the pressure generation in the converging wedge formed by the surfaces. Thickness of the oil film between the surfaces is an important parameter that affects bearing load carrying capacity and its margin of safety. There are indications that texturing of the load carrying surfaces can provide an additional pressure generation in the oil film and better oil circulation in the loaded zone. Introduction of micro indentations or grooves on the bearing surface can thus contribute to higher load carrying capacity and lower coefficient of friction. Latest experimental data and theoretical findings as well as those available in the scientific literature will be discussed in this paper.

  • 41.
    Glavatskih, Sergei
    Luleå University of Technology, Division of Machine Elements.
    Techniques and means for monitoring tribological conditions in mining machinery: state of the art review2004Report (Other academic)
    Abstract [en]

    The objective of this project is to gather and summarize available information on how tribological conditions in mining machinery can be monitored and controlled. In this report, information on techniques and means for the in-line, on-line and off-line monitoring of oil condition are presented and discussed. Important tribological parameters and definitions are given first in order to facilitate the discussion of the measuring methods presented in the following chapter. The monitoring techniques presented are grouped according to the parameter measured such as viscosity or temperature. For each method or technique described, the intention is to discuss the principle of sensor/method operation, location of the sensor (or method application) and interpretation of the obtained data. There is a great variety of monitoring techniques available on the market that are used for all the range of industrial machinery. For some machines, e.g. aircraft, the techniques are much more developed and advanced compared to others, e.g. ships. While collecting the information available in the published literature, the focus was to select the techniques that have a potential of being applied to the machinery in the mining industry. That is why the reader may also find information on monitoring techniques for machines that are not currently in use in the mining industry. Since these machines contain a number of common machine elements/components such as gears, bearings and hydraulic cylinders it is thought that this information is relevant. In the last two chapters typical machinery used in mining industry is described and some recommendations of which methods should be used for monitoring conditions in these machines are given.

  • 42.
    Glavatskih, Sergei
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.
    Tribotronics: monitoring based active friction control2012In: Encyclopedia of Tribology, Springer-Verlag New York, 2012Chapter in book (Refereed)
  • 43.
    Glavatskih, Sergei
    et al.
    Luleå University of Technology, Division of Machine Elements.
    Decamillo, S.
    Influence of oil viscosity grade on thrust pad bearing operation2004In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 218, no 5, p. 401-412Article in journal (Refereed)
    Abstract [en]

    The effect of oil viscosity grade on the performance of tilting pad thrust bearings is examined in a wide range of shaft speeds and specific bearing loads. Data being discussed were obtained in tests carried out with 228 mm outer diameter (o.d.) and 267 mm o.d. bearings lubricated with ISO VG32 and ISO VG68 mineral oils in a fully flooded mode. In a low-speed range (below 40 m/s), the performance of the 228 mm bearing is analysed in terms of pad and collar temperatures, power loss and oil film thickness. Pad temperature and power loss are employed in the analyses of the 267 mm o. d. bearing operated at high sliding speeds of up to 115 m/s. The results show that there is a significant effect of oil viscosity grade on bearing main operating parameters. The substitution of ISO VG32 oil for ISO VG68 oil results in considerably reduced pad temperatures, lower power loss and thinner oil film thickness. However, no measurable difference in power loss was observed after the onset of turbulence. The influence of oil viscosity grade on pad temperature pattern is analysed. The thermal effect of oil viscosity grade on pad temperature pattern and power loss is also compared with the effect of offset pivot.

  • 44.
    Glavatskih, Sergei
    et al.
    Luleå University of Technology, Division of Machine Elements.
    Fillon, Michel
    TEHD analysis of thrust bearings with PTFE-faced pads2004In: Proceedings of the ASME/STLE International Joint Tribology Conference, IJTC 2004, 2004, Vol. Paper no 64178:Part A, p. 603-613Conference paper (Refereed)
    Abstract [en]

    Results of a combined theoretical and experimental investigation into the operation of thrust bearings with PTFE-faced pads are reported. Bearing performance is analysed in terms of temperature, power loss, oil film thickness and pressure. These parameters are first calculated using a THD model. The effect of PTFE facing on bearing thermal performance is then presented and discussed. A TEHD model is subsequently employed. Obtained TEHD results show that oil film thickness and temperature are strongly affected by the PTFE layer. Theoretical results are compared with measured temperature, oil film thickness and pressure.

  • 45.
    Glavatskih, Sergei
    et al.
    Luleå University of Technology, Division of Machine Elements.
    Fillon, Michel
    TEHD Analysis of Thrust Bearings With PTFE-Faced Pads2006In: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 128, no 1, p. 49-58Article in journal (Refereed)
    Abstract [en]

    Results of a combined theoretical and experimental investigation into the operation of thrust bearings with polytetrafluoroethylene (PTFE)-faced pads are reported. Bearing performance is analyzed in terms of temperature, power loss, oil film thickness and pressure. These parameters are first calculated using a THD model. The effect of PTFE facing on bearing thermal performance is then presented and discussed. A TEHD model is subsequently employed. Obtained TEHD results show that oil film thickness and temperature art strongly, affected by the PTFE layer. Theoretical results are compared with measured temperature, oil film thickness, and pressure.

  • 46.
    Glavatskih, Sergei
    et al.
    Luleå University of Technology, Division of Machine Elements.
    Hanahashi, Minoru
    Kawaike, Kazuhiko
    Byheden, Åke
    Norrby, Thomas
    Influence of oil type on tilting pad journal bearing thermal characteristics2009In: Proceedings of the World Tribology Congress 2009: Sunday 6th to Friday 11th, September, 2009, Kyoto, Japan, 2009, Vol. 6183-6186, p. 6183-6186Conference paper (Refereed)
    Abstract [en]

    The effect of ester-based turbine oil on the performance characteristics of a tilting pad journal bearing was studied. Mineral oils with viscosity grade of 32 and 46 and synthetic oil with viscosity similar to that of the mineral oil VG32 were used. Both mineral and synthetic oils provided similar temperatures. Pad temperature was strongly affected by rotational speed. A slower increase in temperature at higher speeds was caused by the shift in the maximum temperature zone due to the pad thermal crowning. Synthetic oil ran slightly hotter than VG32 mineral oil at lower speeds. At higher speed these oils had almost the same temperatures. This is an abstract of a paper presented at the World Tribology Congress

  • 47.
    Glavatskih, Sergei
    et al.
    Luleå University of Technology, Division of Machine Elements.
    Höglund, Erik
    Tribotronics, towards active tribology2006In: Nordtrib 2006, 12th Nordic Tribology Symposium, Denmark: [LO-skolen, Helsingør, Denmark, June 7 - 9 2006], 2006Conference paper (Refereed)
  • 48.
    Glavatskih, Sergei
    et al.
    Luleå University of Technology, Division of Machine Elements.
    Höglund, Erik
    Tribotronics: towards active tribology2008In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 41, no 9-10, p. 934-939Article in journal (Refereed)
    Abstract [en]

    A constant trend towards more compact mechanical systems with higher power densities and increased thermo-mechanical loads emphasises the importance of the development of new design approaches and novel tribological systems. Ignoring this may cause a significant slow down in technological and industrial development. Tribotronics or active tribology based on adaptive performance is thought of as being critical in the implementation of smart machine concepts. Recognition of the importance of tribotronics, or active control of system loss outputs, such as those through friction and wear will have significant beneficial economic consequences as a result of the associated accelerated rate of technological progress. These smart tribotronic systems can be embedded in a great variety of machines and mechanisms. If this integration is made at the design stage, products that are more flexible, efficient and reliable can be produced. The concept of tribotronics is presented and discussed in this paper. Some illustrativeexamples that show the feasibility of an “active” approach are given. In addition, various possibilities already reported in literature are discussed.

  • 49.
    Glavatskih, Sergei
    et al.
    Luleå University of Technology, Division of Machine Elements.
    Kumar, Uday
    Tribotronics facilitates e-maintenance implementation2011In: Proceedings of the 24th International Congress on Condition Monitoring and Diagnosis Engineering Management: COMADEM 2011 / [ed] Maneesh Singh, Raj B.K.N. Rao, J.P. Liyanage, COMADEM International, 2011, p. 501-506Conference paper (Refereed)
    Abstract [en]

    Our modern society depends to a great extent on the functionality and efficiency of all the mechanical machinery that we see around us and use every day. All these machines involve numerous tribological contacts. A contact between two surfaces that are in motion relative to each other will result in friction and wear.A constant trend towards more compact mechanical systems with higher power densities requires them to operate in increasingly severe conditions, which heavily influence tribological contacts. They, in turn, affect machine efficiency and impose a limit on machine reliability and service life. Present tribological systems are passive, i.e. their performance cannot be tuned on-line. The purpose of tribotronics is to control so-called loss outputs in a tribo-mechanical system: friction, wear, vibration, etc. Such a system includes sensors, a control unit and actuators. A tribotronic system is thus autonomous and self-adjusting. This allows for on-line tuning of the tribological components for the best performance. This paper illustrates how tribotronic systems can facilitate e-maintenance and thus provide foundation for the best maintenance decisions.

  • 50.
    Glavatskih, Sergei
    et al.
    Luleå University of Technology, Division of Machine Elements.
    Larsson, Roland
    SPECIAL ISSUE ON NORDTRIB: THE NORDIC SYMPOSIUM ON TRIBOLOGY 20102011In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 225, no J7, p. 563-564Article in journal (Other academic)
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