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  • 51.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Hanahashi, Minoru
    Daido Metal Co., Inuyama.
    Kawaike, Kazuhiko
    Daido Metal Co., Inuyama.
    Byheden, Åke
    Statoil Lubricants, Nynäshamn.
    Norrby, Thomas
    Influence of oil type on tilting pad journal bearing thermal characteristics2009Inngår i: Proceedings of the World Tribology Congress 2009: Sunday 6th to Friday 11th, September, 2009, Kyoto, Japan, Tokyo: Japan Society of Tribologists , 2009, s. 6183-6186Konferansepaper (Annet vitenskapelig)
    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 (Kyoto, Japan 9/6-11/2009).

  • 52. Glavatskih, Sergei
    et al.
    Höglund, Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Tribotronics, towards active tribology2006Inngår i: Nordtrib 2006, 12th Nordic Tribology Symposium, Denmark: [LO-skolen, Helsingør, Denmark, June 7 - 9 2006], Kongens Lyngby: Technical University of Denmark , 2006Konferansepaper (Fagfellevurdert)
  • 53. Glavatskih, Sergei
    et al.
    Höglund, Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Tribotronics: towards active tribology2008Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 41, nr 9-10, s. 934-939Artikkel i tidsskrift (Fagfellevurdert)
    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 illustrative examples that show the feasibility of an “active” approach are given. In addition, various possibilities already reported in literature are discussed.

  • 54. Glavatskih, Sergei
    et al.
    Höglund, Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Larsson, Roland
    Hydrodynamic thrust bearing experimental apparatus for testing environmentally adapted oils1998Inngår i: Tribologia : Finnish Journal of Tribology, ISSN 0780-2285, Vol. 17, nr 2, s. 27-30Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There are indications that some environmentally friendly oils provide performance advantages in hydrodynamic bearings compared to mineral oils. To verify and to quantify the advantages of the synthetic oils in hydrodynamic lubrication in terms of operating film thickness, bearing power loss and operating temperature, a test rig for laboratory experiments has been designed and manufactured. At the first stage of the project temperature and pressure distributions, power loss and oil film thickness for ISO VG46 and VG68 mineral and synthetic oils will be measured at different loads and rotational speeds. At the next stage several other lubricants will be tested. Among them rape seed oil and pine tree oil can be mentioned.

  • 55. Glavatskih, Sergei
    et al.
    Höglund, Erik
    Larsson, Roland
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Hydrodynamic thrust bearing experimental apparatus for testing environmentally adapted oils1998Inngår i: COST 516 Tribology Symposium, Espoo, Finland, 14 - 15 May 1998: Organised by Technical Research Centre of Finland, Manufacturing Technology / [ed] Helena Ronkainen, Espoo: Technical Research Centre of Finland (VTT) , 1998Konferansepaper (Fagfellevurdert)
  • 56.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Höglund, Erik
    Larsson, Roland
    Influence of oil type on hydrodynamic thrust bearings performance2000Inngår i: Tribology at work, Elsevier, 2000Konferansepaper (Fagfellevurdert)
  • 57. Glavatskih, Sergei
    et al.
    Höglund, Erik
    Larsson, Roland
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    On power measurement in hydrodynamic thrust bearings1999Inngår i: COST 516 Tribology Symposium: Antwerpen, Belgium, 20 - 21 May 1999 / [ed] Karen Vercammen; Jan Meneve, Mol: Flemish Institute for Technological Research , 1999Konferansepaper (Fagfellevurdert)
  • 58.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Höglund, Erik
    Larsson, Roland
    Testing environmentally adapted oils for hydrodynamic lubrication2000Inngår i: Proceedings of the 3rd COST 516 Tribology symposium: Eibar, Spain, 18 and 19 May 2000 / [ed] Amaya Igartua; Alberto Alberdi, Elbar: Tekniker , 2000Konferansepaper (Fagfellevurdert)
  • 59.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Kumar, Uday
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Drift, underhåll och akustik.
    Tribotronics facilitates e-maintenance implementation2011Inngår i: 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, s. 501-506Konferansepaper (Fagfellevurdert)
    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.

  • 60.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Larsson, Roland
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Improved efficiency with the use of environmentally adapted lubricants2000Rapport (Annet vitenskapelig)
  • 61. Glavatskih, Sergei
    et al.
    Larsson, Roland
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Oil film thickness measurement by means of an optic lever technique1998Inngår i: Proceedings of the 8th International Conference on Tribology: Hotel Ebeltoft Strand, Ebeltoft, Denmark, June 7 - 10, 1998 / [ed] Svend S. Eskildsen, Aarhus: DTI Tribology Centre , 1998Konferansepaper (Fagfellevurdert)
  • 62.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Larsson, Roland
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Special issue: 14th Nordic Symposium on Tribology, NORDTRIB 2010: Editorial2012Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 48, nr AprilArtikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Nordic Symposium on Tribology, NORDTRIB, is arranged every second year in one of the Nordic countries: Denmark, Finland, Norway or Sweden. In June 2010 the 14th NORDTRIB, organized by Luleå University of Technology, was held in a picturesque location at Storforsen, Sweden.One hundred and seventy eight tribologists from thirty countries participated in the symposium. It is the highest number of participants recorded during NORDTRIB history.The fact that interest in tribology continues to grow internationally was also reflected during a workshop held before the symposium. The theme of the workshop was “Why tribology is more important than ever”. The discussions focused on what tribology can do for sustainable growth and to limit climate change. Prominent scientists from Australia, Austria, China, Finland, Japan, Slovenia, and UK described current and future trends in tribology research as well as how such research is motivated in their home countries.One hundred and thirty four papers were presented at the symposium. The keynote lectures covered tribological challenges in wind turbine gearboxes, advancements of tribology in nano-manufacturing, atomic level studies, smart tribological coatings, and numerical methods for solving tribological problems.There was also a special poster session for young tribologists. This time the session was organized by the Swedish Research School in Tribology (www.ltu.se/tribology-school), which is a collaborative project between four Swedish Universities; Halmstad University, Luleå University of Technology, KTH Royal Institute of Technology and Uppsala University. Doctoral students presented their research projects and latest findings. The session was an inspiring and rewarding forum for the next generation of tribologists.Many excellent papers were presented at the symposium covering a wide range of research activities and recent developments in tribology. A selection of 7 papers, representing both experimental and theoretical studies, is included in this Special issue.We hope that those of you who were unable to attend the symposium will catch up on the latest research findings you missed and enjoy reading this issue.The next Nordic Symposium on Tribology will be held in Norway in June 2012.We are grateful to Tribology International for excellent cooperation and possibility to publish the selected contributions in this Special issue.

  • 63.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Larsson, Roland
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Special issue on NORDTRIB: The Nordic Symposium on Tribology 2010: Guest editorial2011Inngår i: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 225, nr 7, s. 563-564Artikkel i tidsskrift (Annet vitenskapelig)
  • 64.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    McCarthy, Donald
    Hydrodynamic bearings with improved performance and reliability : Part I: Influence of pad surface material2003Rapport (Annet vitenskapelig)
    Abstract [en]

    Study of the influence on performance characteristics of employing a compliant facing material (PTFE) on hydrodynamic fluid film thrust bearings. Comparison is made between plain babbitt and PTFE facing materials

  • 65.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    McCarthy, Donald
    Hydrodynamic bearings with improved performance and reliability : Part II: Influence of pad surface texturing2003Rapport (Annet vitenskapelig)
    Abstract [en]

    Study of the influence on performance characteristics, including oil film thickness, of employing an etched pattern on the babbitt facing of hydrodynamic fluid film thrust bearings. Comparison is made between plain babbitt and etched babbitt facing material.

  • 66.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Mccarthy, Donald
    Sherrington, I.
    Jost Institute for Tribotechnology, Department of Technology, University of Central Lancashire, Preston.
    Hydrodynamic performance of a thrust bearing with micropatterned pads2005Inngår i: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 48, nr 4, s. 492-498Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The primary objective of this study was to investigate the influence of surface texturing on hydrodynamic lubrication of tilting-pad thrust bearings in terms of bearing power loss, operating temperature, and oil-film thickness. For this purpose, the working faces of six thrust pads from a 228.6-mm-outer-diameter bearing were textured. The textured surface consisted of a system of crossing channels of less than 10 μm in depth. Tests were conducted with a VG68 mineral turbine oil supplied to the bearings at a constant temperature of 50°C and flow rate of 15 L/min. The following parameters were measured: frictional torque, pad and collar temperatures, oil-film thickness, and pressure profiles along two circumferential lines. No significant change in collar and pad temperature could be observed when the patterned bearing was used. However, the textured bearing showed a tendency to exhibit lower power loss especially when an optimum oil flow supply rate was used. At the same time, inlet and outlet film thicknesses for the patterned bearing showed larger values than those obtained during tests on the plain babbitt pads.

  • 67.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Mccarthy, Donald
    Sherrington, Ian
    Department of Engineering and Product Design, University of Central Lancashire, Preston.
    Further transient test results for a pivoted-pad thrust bearing2004Inngår i: Transient processes in tribology: proceedings of the 30th Leeds-Lyon Symposium on Tribology held at INSA de Lyon Villeurbanne, France, 2nd-5th September 2003 / [ed] Gérard Dalmaz, Amsterdam: Elsevier, 2004, s. 301-312Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Evolution of friction torque in a pivoted-pad thrust pad bearing, as well as collar and shaft temperatures and pressure profiles in transient conditions, have been investigated in [1]. The present paper reports further transient test results for the same thrust bearing with an outer diameter of 228.6mm and 60% offset pivoted pads, operated in fully flooded mode. In this study, a complete set of bearing main performance parameters, including bearing pad and collar temperatures, oil film thickness and friction torque are obtained by means of a high-speed data acquisition system. Evolution of these parameters as a result of sudden variations in rotational speed and load are presented and analysed. Results are generalised in terms of Fourier number and compared with published numerical data

  • 68. Glavatskih, Sergei
    et al.
    Norrby, Thomas
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Torbacke, Marika
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Byheden, Åke
    Long term experience with environmentally adapted oils in hydrodynamic bearings of hydroelectric power plants2006Inngår i: 23rd IAHR Symposium on Hydraulic Machinery and Systems: Yokohama, Japan, October 17 - 21, 2006 ; [conference proceedings], 2006Konferansepaper (Fagfellevurdert)
  • 69.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Sherrington, I.
    Jost Institute for Tribotechnology, Department of Technology, University of Central Lancashire, Preston.
    Tribotronics: an active approach to the condition monitoring of tribological components in wind turbines2010Inngår i: Proceedings of the 23rd International Congress on Condition Monitoring and Diagnostic Engineering Management: COMADEM 2010, Nara, 28 June 2010 through 2 July 2010 / [ed] Susumu Okumura, Hikone: Sunrise Publishing , 2010, s. 711-714Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we describe an active approach to the control of tribological components called "tribotronics". The structure and operation of a tribotronic system is described. The main advantage of these systems is that they contain actuators that allow changes/adjustments in component performance to be made in response to feedback (condition monitoring) signals in near real time. This approach can potentially address a developing problem at an early stage while providing a significant efficiency and cost savings through the reduction of on-site maintenance. Suggestions about how these systems could be usefully implemented in wind turbines are made

  • 70.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Uusitalo, Östen
    Luleå tekniska universitet.
    Spohn, Daniel J.
    Kaman Instrumentation Corporation, Colorado Springs.
    Simultaneous monitoring of oil film thickness and temperature in fluid film bearings2000Inngår i: 9th Nordic Symposium on Tribology: NORDTRIB 2000 : Porvoo, Finland, 11-14 June 2000 / [ed] Peter Andersson; Helena Ronkainen; Kenneth Holmberg, Espoo: Technical Research Centre of Finland (VTT) , 2000, Vol. 3, s. 756-765Konferansepaper (Fagfellevurdert)
  • 71.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Uusitalo, Östen
    Luleå tekniska universitet.
    Spohn, D.J.
    Simultaneous monitoring of oil film thickness and temperature in fluid film bearings2002Inngår i: Lubricants, materials and lubrication engineering: 13th International Colloquium Tribology, January 15 - 17, 2002. Technische Akademie Esslingen / [ed] Wilfried J. Bartz, Ostfildern: Techn. Akad. Esslingen , 2002Konferansepaper (Fagfellevurdert)
  • 72.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Wasilczuk, M.
    Fillon, M.
    Performance peculiarities of PTFE-faced tilting-pad thrust bearings2004Inngår i: Improvement of bearing performance under severe operating conditions: 3rd EDF/LMS Poitiers Workshop FUTUROSCOPE, 2004Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Application of PTFE composites as pad facing allows for a significant improvement in tilt pad thrust bearing performance under severe operating conditions. Many applications of PTFE lined thrust bearings are known, primarily in water turbines in Russia and China, but recently a lot of interest in this kind of pad facing is observed in other countries, as well. This paper is a short overview of the peculiarities in bearing performance caused by some specific properties of PTFE composites. Known techniques for bonding PTFE composites to steel backing are first discussed. The PTFE bonding method utilized in Russia results in an intentionally increased resilience of the bearing surface. The effect of compliant nature of the PTFE on oil film geometry is considered. Another important aspect of using PTFE facing is the thermal insulation of the pad, minimizing its thermal distortions. The effect of minimized thermal distortions, being an advantage for large thrust bearing of water turbines, but, interestingly, not in all applications, is examined. Tribological (friction and wear) aspects of using PTFE layer are also discussed. Additional advantages of using PTFE as a substitute for babbitt are addressed as well. Finally, techniques for monitoring conditions in the PTFE bearings are described.

  • 73.
    Glavatskih, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Zherdev, A.A.
    Lubenets, V.V:
    Glukhov, S.D.
    Gas Stove-refrigerator2000Inngår i: Proceedings of the sixth international symposium on cold region development, IACORDS , 2000Konferansepaper (Fagfellevurdert)
  • 74. Glavatskikh, Sergei
    Activity: ASME/STLE International Joint Tribology Conference2010Konferansepaper (Annet (populærvitenskap, debatt, mm))
  • 75. Glavatskikh, Sergei
    Activity: STLE Annual Meeting2010Konferansepaper (Annet (populærvitenskap, debatt, mm))
  • 76.
    Glavatskikh, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    On the hydrodynamic lubrication in tilting pad thrust bearings2000Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The primarily objective of this work was to investigate the performance of environmentally adapted synthetic oils in the hydrodynamic lubrication regime. A special test facility has been designed and manufactured for this purpose. The facility contains two equalising tilting pad thrust bearings typical of design in general use. One of the bearings is instrumented with thermocouples, pressure and oil film thickness sensors. Three thermistors and two pressure sensors are installed in one of the shaft collars. Power losses are measured by monitoring bearing friction torque and by the calorimetric technique. All sensors are connected to a PC based high-speed data acquisition system. The facility allows a complete set of bearing operating parameters to be obtained. Bearing characteristics in steady state and transient operating conditions were investigated at different load-speed combinations as well as at various supplied oil temperatures and flow rates. Steady state results were compared with the outputs of THD and TEHD theoretical models. The agreement was found to be good. Tests were run to find a possible replacement of ISO VG68 mineral oil currently used in thrust bearing units of hydroelectric power stations. Oils tested included mineral base ISO VG68 and ISO VG46 oils, PAO and ester base ISO VG46 oils. Tests showed that a change from VG68 oil to the lower viscosity grade oil reduces bearing peak temperatures. It is also shown that the energy savings associated with the use of VG46 oil in place of VG68 are significant. However, such a change may only be justified for the ester base oil since it gives as thick oil films as mineral oil ISO VG68 does. Alternatively, if the ester base oil is used instead of a mineral oil of the same viscosity grade bearing reliability is increased due to the increased oil film.

  • 77.
    Glavatskikh, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Fillon, Michel
    Laboratory of Solid Mechanics, University of Poitiers.
    TEHD analysis of thrust bearings with PTFE-faced pads2006Inngår i: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 128, nr 1, s. 49-58Artikkel i tidsskrift (Fagfellevurdert)
    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 are strongly affected by the PTFE layer. Theoretical results are compared with measured temperature, oil film thickness, and pressure.

  • 78. Glavatskikh, Sergei
    et al.
    Fillon, Michel
    Laboratory of Solid Mechanics, University of Poitiers.
    Larsson, Roland
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    The significance of oil thermal properties on the performance of a tilting-pad thrust bearing2002Inngår i: Journal of tribology, ISSN 0742-4787, E-ISSN 1528-8897, Vol. 124, nr 2, s. 377-385Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper is a report into an experimental and theoretical investigation of the effect of oil thermal properties on the performance of a tilting-pad thrust bearing. Three oils, namely poly-α-olefin, ester and mineral base, were chosen for this study. These oils all have same viscosity grade (ISO VG46) but differ in their rates of viscosity variation with temperature and in their heat capacity and thermal conductivity values. Mineral base oil of a higher viscosity grade (ISO VG68) was also analyzed for comparison. Experimental data were obtained from an equalizing tilting-pad thrust bearing with an outer diameter of 228.6 mm operating in a flooded lubrication mode. Simultaneous measurements of pad and collar temperatures, friction torque, pressures and oil film thickness were taken. In the tests, oil supply temperature and flow rate were held constant for all load-speed combinations. The theoretical analysis of oil performance was based on a three-dimensional TEHD model. In the analysis, thermal effects were locally taken into account and heat transfer into the pads was considered. The displacements of the active surface of the pads, due to pressure and temperature fields, were determined. The effect of initial pad crowning on the oil film thickness is discussed. Experimental and theoretical results are compared and analyzed in terms of the inlet and outlet oil film thickness, bearing operating temperature and power loss.

  • 79.
    Glavatskikh, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Larsson, Roland
    Oil film thickness measurement by means of an optic lever technique2000Inngår i: Lubrication Science, ISSN 0954-0075, E-ISSN 1557-6833, Vol. 13, nr 1, s. 23-35Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Oil film thickness in hydrodynamic bearings is a fundamental parameter influencing overall hydrodynamic bearing performance. Knowledge of this thickness allows bearing performance to be optimized. For the small hydrodynamic bearings that are usually used in laboratory test facilities, a very small sensor (e.g., <2 mm) is required because of space limitations. Commercially available eddy-current and capacitance sensors are too large to be mounted in the pad of such a bearing. An alternative approach is to use sensors based on optical methods, such as the optic lever technique. The main idea in this technique is to detect the intensity of a light beam reflected from a target surface. This intensity is a function of the distance between the sensor and the target. This paper reports the specific features of the optic lever technique as used for measurements of oil film thickness. The design, calibration procedure, and main characteristics of an optical sensor are discussed. A test rig for the calibration of oil film thickness sensors is also presented. The sensor response curve has two parts, linear and non-linear; using the linear part results in high sensitivity in the micrometre range. The influence of different types of oil on the output signal of the sensor has also been investigated. Experiments with different target velocities have shown that this sensor can be used for accurate and reliable measurement of oil film thickness in hydrodynamic bearings

  • 80.
    Glavatskikh, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Larsson, Roland
    Performance of synthetic oils in the hydrodynamic regime: I. Experimental2003Inngår i: Journal of Synthetic Lubrication, ISSN 0265-6582, Vol. 20, nr 1, s. 15-24Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An investigation of the performance of environmentally adapted synthetic oils in the hydrodynamic lubrication regime has been carried out. Four oils have been tested: polyalphaolefin and ester based ISO VG46 oils as well as mineral ISO VG68 and VG46 oils. Tests were conducted in a facility containing two identical tilting-pad thrust bearings typical of the design in general use. The differences between the mineral and synthetic oils in terms of maximum operating temperature, minimum oil film thickness, and bearing power loss have been examined. Substitution of the mineral ISO VG68 oil with an ISO VG46 oil slightly reduces the bearing operating temperature. This is due to a decrease in the basic viscosity. It is concluded that the ester base ISO VG46 oil can be used as an environmentally adapted replacement for the mineral ISO VG68 oil without sacrificing bearing safety. Such a change also offers noticeable energy savings. If the ester based oil is used instead of a mineral oil of the same viscosity grade, bearing reliability is improved by the increased oil film thickness.

  • 81.
    Glavatskikh, Sergei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Larsson, Roland
    Performance of synthetic oils in the hydrodynamic regime: II. Generalisation2003Inngår i: Journal of Synthetic Lubrication, ISSN 0265-6582, Vol. 20, nr 2, s. 139-150Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In Part I the results of an extensive experimental investigation of the performance of environmentally adapted oils in the hydrodynamic regime were reported. Four oils were tested in a tilting-pad thrust bearing for different combinations of load, shaft speed, and supply oil temperature. In this second part, details of a generalisation procedure are described. A number of parameters representing the physical properties of an oil, such as viscosity and viscosity-temperature coefficient, are adopted. The influence of each of these parameters on minimum oil film thickness, maximum temperature rise, and bearing power loss is then analysed. It is shown that viscosity measured at the supply oil temperature is the most important parameter. The effects of the viscosity-temperature coefficient and oil thermal conductivity are less pronounced and yet significant. It is also shown that it is not possible to select an optimum oil that yields maximised oil film thickness, minimised temperature rise, and minimised power loss at the same time.

  • 82. Golchin, Arash
    et al.
    Simmons, Gregory F
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Break-away friction of PTFE materials in lubricated conditions2010Inngår i: 14th Nordic Symposium on Tribology: NORDTRIB 2010 : Storforsen, Sweden, June 8-11, 2010, Luleå: Luleå tekniska universitet, 2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This study investigates the tribological characteristics at the initiation of sliding (break-away friction) of several polytetrafluoroethylene (PTFE) based materials including virgin PTFE (PP), PTFE filled with 25% black glass (PG), PTFE filled with 40% Bronze (PB), PTFE filled with 25% Carbon (PC), and PTFE filled with 20% glass fibre and 5% Molybdenum disulphide (PM), as well as standard white-metal Babbitt (BA) in lubricated sliding contact with a steel counter-face. Experiments were carried out using a reciprocating tribo-meter in the block on plate configuration with the specific goal of determining the friction characteristics at break-away under varying conditions. Apparent contact pressures of 1 to 8 MPa were applied with oil temperature levels of 25° to 85°C. Bronze- and carbon-filled PTFE and virgin PTFE were found to provide generally lower break-away friction and less variation in break-away friction over the course of testing than the other tested materials. Break-away friction tests after an extended stop under loading found bronze- and carbon-filled PTFE and virgin PTFE to be minimally affected by the extended stop whereas Babbitt produced a significant increase in break-away friction in the first cycle after stopping. Break-away friction for the four tested materials after an extended stop returned to pre-stop values after 1 stroke.

  • 83.
    Golchin, Arash
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Simmons, Gregory F
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Break-away friction of PTFE materials in lubricated conditions2012Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 48, nr April, s. 54-62Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study investigates the tribological characteristics at initiation of sliding (break-away friction) of several polytetrafluoroethylene based materials. Four PTFE composites, pure PTFE, and white-metal were tested in a reciprocating tribo-meter with the block on plate configuration against a steel counter surface. Apparent contact pressure and oil temperature were varied from 1-8 MPa and 25-85\degc respectively. SEM investigations revealed wear patterns of the PTFE materials and the abrasive nature of hard fillers.Bronze-filled, carbon-filled, and pure PTFE were found to provide lower break-away friction and less variation over the course of testing and generally superior properties.

  • 84. Jourak, Amir
    et al.
    Cervantes, Michel
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Cupillard, Samuel
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    CFD analysis of a journal bearing with a microgroove on the shaft2008Inngår i: Proceedings of the 19th International Symposium on Transport Phenomena (ISTP-19): Reykjavik, Iceland, August 17-21, 2008 / [ed] Sigurdur Brynjolfsson; Olafur Petur Palsson; Jong H. Kim, University of Iceland, Faculty of Industrial Engineering, Mechanical Engineering and Computer Science , 2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Journal bearings are used in many applications. An increase of their load carrying capacity and/or decrease of their losses may allow for savings of an enormous amount of energy. One way to enhance the characteristics of journal bearings is to modify the surface texture of the stator. The purpose of the present study is to investigate the influence of a textured rotor on journal bearing characteristics. Computational Fluid Dynamics is used to model the flow between the rotor and the journal. The full Navier-Stokes equations are solved under unsteady conditions with the commercial software ANSYS CFX 11. A two-dimensional geometry is used to model the bearing. In order to make a simulation, a separate rotor and stator are made and are attached to each other using a rotor-stator interface. Firstly, a single mesh for the smooth journal bearing is used to evaluate possible numerical artefacts created by the interface. The results illustrate a difference of 2.8 % in the load carrying capacity. Simulation with a dimpled rotor followed. Comparison between a dimpled rotor and smooth rotor shows no significant increase in load carrying capacity of the journal bearing when thermal effects are not taken into account.

  • 85. Kuznetsov, Evgeny
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Dynamic characteristics of a 2 axial groove journal bearing with a PTFE lining2008Inngår i: Lubricants, materials and lubrication engineering: 16th International Colloquium Tribology ; January 15 - 17, 2008 in Stuttgart/Ostfildern, Germany / [ed] Wilfried J. Bartz, Ostfildern: Techn. Akad. Esslingen , 2008Konferansepaper (Fagfellevurdert)
  • 86. Kuznetsov, Evgeny
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Stability analysis of a compliant lemon bore journal bearing2008Inngår i: Proceedings of the 9th Biennial ASME Conference on Engineering Systems Design and Analysis, ESDA 2008: July 7-9, 2008, Haifa, Israel, New York, NY: American Society of Mechanical Engineers , 2008, Vol. 3, s. 561-568Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Dynamic coefficients for a lemon bore journal bearing with a compliant PTFE surface are computed. An efficient method for the calculation of bearing dynamic coefficients proposed by Lund [4] has been extended to compliant bearings. Comparison with a rigid babbitted lemon bore journal bearing in terms of dynamic coefficients and stability is given and discussed. It is shown that it is important to consider perturbations of both the oil film and the compliant lining to obtain realistic results. It is also shown that stability of compliant bearings is improved at some eccentricities compared with conventional babbitted bearings.

  • 87. Kuznetsov, Evgeny
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Fillon, Michel
    University of Poitiers.
    THD analysis of a compliant journal bearing considering liner deformation2009Inngår i: Proceedings of the World Tribology Congress 2009: Sunday 6th to Friday 11th, September, 2009, Kyoto, Japan, Tokyo: Japan Society of Tribologists , 2009, s. 216-Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The effect of compliant PTFE lining on hydrodynamics was studied. Results for the white metal and PTFE lined bearings were compared in terms of the maximum temperature, oil film thickness, and power loss. The oil film thickness in the PTFE bearing was shown. A favorable oil pocket was formed in the loaded zone. Temperature in the PTFE bearing was slightly higher. This is an abstract of a paper presented at the World Tribology Congress (Kyoto, Japan 9/6-11/2009).

  • 88.
    Kuznetsov, Evgeny
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Fillon, Michel
    Institut Prime, CNRS - Université de Poitiers - ENSMA.
    THD analysis of compliant journal bearings considering liner deformation2011Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 44, nr 12, s. 1629-1641Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A numerical THD model is developed to investigate the effect of lining compliance on the bearing characteristics. The analysis shows increased load carrying capacity, significantly reduced peak pressures and thicker oil film in the loaded zone compared to a white metal bearing. Slightly thinner oil films are predicted at the bearing edges. Temperature and power loss are found to be similar for some load-speed combinations but higher for other operating conditions. It is also shown that load carrying capacity is more sensitive to thermal expansion while pressure and oil film thickness profiles are more sensitive to elastic deformation

  • 89.
    Markin, D.
    et al.
    Luleå tekniska universitet.
    McCarthy, D.M.C.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    A FEM approach to simulation of tilting pad thrust bearing assembles2002Inngår i: 10th Nordic Symposium on Tribology: NORDTRIB 2000 : Hotel Foresta and KTH, Stockholm, Sweden, June 9-12, 2002, Stockholm: Kungl. Tekniska Högskolan , 2002Konferansepaper (Annet vitenskapelig)
  • 90.
    Markin, D.
    et al.
    Luleå tekniska universitet.
    McCarthy, Donald
    Glavatskikh, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    A FEM approach to simulation of tilting-pad thrust bearing assemblies2003Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 36, nr 11, s. 807-814Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Finite-element method (FEM) modelling is applied to analysis of the performance of hydrodynamic tilting-pad thrust bearing assemblies. A 3D model of the bearing assembly that includes the bearing pad and shaft is used to assess the influence of operating conditions on bearing parameters such as temperature and oil film distributions across the pads. The model is first applied to the investigation of a spherically pivoted-pad. Through comparison with results from experiments carried out on just such a bearing, good correlation between the model and experimental results is found for maximum oil film temperature, pressure distribution and thickness. The model is then applied to the examination of a bearing having spring-supported babbitt pads. The effect of different oil types on a spring-supported thrust bearing is analysed. Further application of the model to investigate the same spring-supported pad, this time with a resilient surface coating, is discussed.

  • 91. McCarthy, Donald
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Assessment of polymer composites for hydrodynamic journal bearing applications2008Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Polymer composites are employed as facing materials in hydrodynamic bearings for their low friction and "compliant" properties which play an important role during machinery operation. In journal bearings, this low friction property can be of significant importance during start and stop cycles when insufficient oil is available to fully separate the surfaces in relative motion. Current work is aimed at determining a suitable material for use in hydrodynamic journal bearings. This study investigates friction and wear encountered during the transition from the stationary state to operational speed (acceleration) during initial start-up. This is examined for virgin PTFE together with a series of commercially available PTFE-based composites and a babbitt material in boundary / mixed lubrication conditions. Tests are performed using a standard laboratory block-on-ring test apparatus with a VG32 mineral oil.

  • 92. McCarthy, Donald
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Assessment of polymer composites for hydrodynamic journal-bearing applications2009Inngår i: Lubrication Science, ISSN 0954-0075, E-ISSN 1557-6833, Vol. 21, nr 8, s. 331-341Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Polymer composites are used as facing materials in hydrodynamic bearings for their low friction and compliant properties, which play an important role during machinery operation. In journal bearings, this low friction property can be of significant importance during start and stop cycles when insufficient oil is available to fully separate the surfaces in relative motion. Current work is aimed at determining a suitable material for use in hydrodynamic journal bearings for applications in hydroelectric power plants. This study investigates friction and wear encountered during the transition from the stationary state to operational speed (acceleration) during initial start-up. This is examined for virgin poly-tetra-fluoro-ethylene (PTFE) together with a series of commercially available PTFE-based composites and a babbitt material in boundary/mixed lubrication conditions. Tests are performed using standard laboratory block-on-ring test apparatus with a VG32 mineral oil.

  • 93. McCarthy, Donald
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    "Break-away" friction for PTFE-based composites2008Inngår i: Lubricants, materials and lubrication engineering: 16th International Colloquium Tribology; January 15 - 17, 2008 in Stuttgart/Ostfildern, Germany / [ed] Wilfried J. Bartz, Ostfildern: Techn. Akad. Esslingen , 2008Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The use of polymer composites as facing materials in hydrodynamic thrust bearings gives performance benefits in terms of temperature distribution and friction losses. A study was carried out to investigate the break-away friction encountered during the transition phase (acceleration) under initial start-up from stationary state to full operational speed. This was examined for a series of commercially available PTFE-based composites. The lubricant used was a mineral oil. Best performance in terms of relative friction and wear was found for a carbon filled PTFE composite material. This is an abstract of a paper presented at the 16th International Colloquium Tribology Lubricants Materials and Lubrication Engineering (Stuttgart/Ostfildern, Germany 1/15-17/2008).

  • 94. McCarthy, Donald
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Byheden, A.
    Statoil Lubricants R&D.
    Hydrodynamic journal bearing performance using rapeseed base fluid lubricant2008Inngår i: Lubricants, materials and lubrication engineering: 16th International Colloquium Tribology; January 15 - 17, 2008 in Stuttgart/Ostfildern, Germany / [ed] Wilfried J. Bartz, Ostfildern: Techn. Akad. Esslingen , 2008Konferansepaper (Annet vitenskapelig)
  • 95. McCarthy, Donald
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Byheden, Åke
    Statoil Lubricants, Nynäshamn.
    Influence of oil type on the performance characteristics of a two axial groove journal bearing2008Inngår i: Proceedings of NORDTRIB 2008, 13th Nordic Symposium on Tribology: Scandic Rosendahl Hotel, Tampere, Finland, June 10 - 13, 2008 / [ed] Jaakko Kleemola; Arto Lehtovaara, Tampere: Tampere University of Technology, 2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The use of Environmentally Adapted Lubricants (EALs) is a subject of growing interest to industry as legislation increasingly demands the replacement of mineral oil lubricants. Vegetable based fluids are widely seen as providing lubricants from a renewable source as well as meeting demands for improved biodegradability. However, at present, utilisation of such fluids is limited due to their rapid oxidation. EALs produced from other base stocks (i.e. synthetic esters) have been shown to provide performance benefits in hydrodynamic thrust bearings. In the present study, a hydrodynamic journal bearing test rig has been employed to compare the performance of three EALs (a VG32 saturated ester, rapeseed base fluid and a Propylene Glycol Dioleate) relative to three mineral turbine oils (ISOVG32, ISOVG46 and ISOVG68) in the hydrodynamic regime. Results are given in terms of temperature, power loss and minimum film thickness. The impact of oil VI is also discussed.

  • 96. McCarthy, Donald
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Byheden, Åke
    Statoil.
    Influence of oil type on the performance characteristics of a two-axial groove journal bearing2009Inngår i: Lubrication Science, ISSN 0954-0075, E-ISSN 1557-6833, Vol. 21, nr 9, s. 366-377Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The use of environmentally adapted lubricants (EALs) is a subject of growing interest to industry as legislation increasingly demands the replacement of mineral oil lubricants. Vegetable-based fluids are widely seen as providing lubricants from a renewable source, as well as meeting demands for improved biodegradability. However, at present, utilization of such fluids is limited due to their rapid oxidation. EALs produced from other base stocks (i.e. synthetic esters) have been shown to provide performance benefi ts in hydrodynamic thrust bearings. In the present study, a hydrodynamic journal bearing test rig has been employed to compare the performance of three EALs (a VG32 saturated ester, rapeseed base fluid and a propylene glycoldioleate) relative to three mineral turbine oils (ISOVG32, ISOVG46 and ISOVG68) in the hydrodynamic regime. Results are given in terms of temperature, power loss and minimum fi lm thickness. The impact of oil viscosity index is also discussed.

  • 97. Mccarthy, Donald
    et al.
    Glavatskih, Sergei
    Kassfeldt, Elisabet
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Pach, Mayte
    Statoil Lubricants R&D, Nynäshamn.
    Byheden, Åke
    Statoil Lubricants R&D, Nynäshamn.
    Norrby, Thomas
    Aged environmentally adapted lubricants: Part II: Performance evaluation in boundary lubricated contacts2006Inngår i: Automotive and industrial lubrication: 15th International Colloquium Tribology, January 17 - 19, 2006 ; [book of synopses 2006] / [ed] Wilfried J. Bartz, Ostfildern: Techn. Akad. Esslingen , 2006, s. 140-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Experiments are conducted to compare the performance of fresh and aged samples of three oils in a boundary lubricated contact. These oils are Oil A (a commercially available unsaturated synthetic ester based hydraulic fluid (ISOVG32)), Oil B (a mineral based turbine oil (ISOVG68), and Oil C (a saturated synthetic ester based lubricating fluid (ISOVG46)). Tests are performed using a tin-bronze on steel contact in a pin-on-disc apparatus. Results from these tests provide data relating to friction and wear and their coupling to the aging of the fluids. No evidence of any significant deterioration of lubricant performance is observed for any of the fluids tested. This is an abstract of a paper presented at the 15th International Colloquium Tribology - Automotive and Industrial Lubrication (Ostfildern, Germany 1/17-19/2006).

  • 98. McCarthy, Donald
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Pach, M.
    Statoil Lubricants R&D.
    Dmitriev, A.
    Department of Applied Physics, Chalmers University of Technology.
    Performance evaluation for aged environmentally adapted lubricants in bronze-steel sliding contacts2008Inngår i: Journal of Synthetic Lubrication, ISSN 0265-6582, Vol. 25, nr 3, s. 115-129Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Environmentally adapted lubricants (EALs) are becoming of increasing interest to the industry as legislation demands the replacement of mineral oil lubricants. However, little or nothing is known about the infl uence of ageing on the performance of these fluids in mixed and boundary lubricated tribological contacts. In this study, samples of three fully formulated lubricating oils, both in their 'unaged' form and 'aged' by means of an oxidation process in the laboratory, were utilized in a detailed study whereby variations in relative lubrication performance were examined. Standard laboratory pin-on-disc equipment was utilized in order to allow comparisons to be made and the definition of conclusions for a sliding tin bronze on steel contact. This simulated the interaction between an oil-lubricated bronze bushing and steel shaft as found in the vane adjustment mechanism of a Kaplan turbine. X-ray photoelectron spectroscopy analysis was employed to assess the effect on surface layer structural chemistry. Results showed, for the specific application being investigated, that EALs continue to function well in terms of their friction and wear performance even at high acid numbers

  • 99. Mccarthy, Donald
    et al.
    Glavatskih, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Sherrington, Ian
    Oil film thickness and temperature measurements in PTFE and Babbitt faced tilting-pad thrust bearings2006Inngår i: Proceedings of the 11th Nordic symposium on tribology: NORDTRIB 2004 : Tromsø, Harstad, Hurtigruten, [Bodø], Norway, June [1 - 5], 2004, 2006, s. 167-176Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The influence of pad facing material on hydrodynamic lubrication in tilting-pad thrust bearings is investigated in terms of pad and oil-film temperatures and thicknesses. Two tilting-pad thrust bearings are examined: one with babbitt pad facing, the other with a layer of PTFE-based composite material. Frictional torque, pad, collar, and oil-film temperatures and thicknesses are all monitored by means of a comprehensive array of sensors mounted in the bearing and shaft. A considerably smaller range of temperature is seen in the steel backing immediately below the surface material for the PTFE faced pads. Oil-film temperatures measured at the mid-point on the pad trailing edge show no significant difference between the two bearings. Oil-film thicknesses in the two bearings are seen to differ. At the leading edge, oil-film thickness is thinner for the PTFE pad than for babbitt. However, at the trailing edge the PTFE pad has the thicker film.

  • 100. Mccarthy, Donald
    et al.
    Glavatskikh, Sergei
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Sherrington, I.
    University of Central Lancashire, Jost Institute for Tribotechnology, Department of Technology.
    Oil-film thickness and temperature measurements in PTFE and babbitt faced tilting-pad thrust bearings2005Inngår i: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 219, nr 3, s. 179-185Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of pad facing material on hydrodynamic lubrication in tilting-pad thrust bearings is investigated in terms of pad and oil-film temperatures and thicknesses. Two tilting-pad thrust bearings are examined: one with babbitt pad facing, the other with a layer of PTFE-based composite material. Frictional torque, pad, collar, and oil-film temperatures and thicknesses are all monitored by means of a comprehensive array of sensors mounted in the bearing and shaft. A considerably smaller range of temperature is seen in the steel backing immediately below the surface material for the PTFE faced pads. Oil-film temperatures measured at the mid-point on the pad trailing edge show no significant difference between the two bearings. Oil-film thicknesses in the two bearings are seen to differ. At the leading edge, oil-film thickness is thinner for the PTFE pad than for babbitt. However, at the trailing edge the PTFE pad has the thicker film.

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