Ing. Radek Poliščuk, Ph.D.
E-mail:   Radek.Poliscuk@vut.cz  WWW:   http://uai.fme.vutbr.cz/main.php?page=OSOBA&id=RP Dept.:   Institute of Machine and Industrial Design Dept. of Tribology Position:   Research Worker Room:   A1/0628 Dept.:   Institute of Automation and Computer Science Dept. of Applied Computer Science Position:   Assistant Professor Room:   A1/0628

Supervised courses:

• Programmable Controller Systems (PLC) (VPL-K)
• Programmable Controller Systems (PLC) (VPL)

Publications:

• KŘUPKA, I.; POLIŠČUK, R.; HARTL, M.:
  Projekt BigBertha, Koyo Bearings Česká republika s.r.o.
  summary research report - contract. research
• ZATOČILOVÁ, A.; POLIŠČUK, R.; PALOUŠEK, D.; BRANDEJS, J.:
  Photogrammetry based system for the measurement of cylindrical forgings axis straightness,
  Optical Measurement Systems for Industrial Inspection VIII, pp.87881L-1-88781L-10, ISBN 9780819496041, (2013), Proc. SPIE
  conference paper
  akce: SPIE Optical Metrology 2013, Mnichov, 13.05.2013-16.05.2013
• POLIŠČUK, R.:
  Image Processing Methods Applied in Mapping of Lubrication Parameters,
  Advances in Visual Computing, pp.1011-1020, ISBN 978-3-642-10519-7, (2009), Springer-Verlag
  conference paper
  akce: 5th International Symposium on Visual Computing, Las Vegas, Nevada, 30.11.2009-02.12.2009
• POLIŠČUK, R.:
  Measurement of Lubrication Parameters Based on Image Processing of Chromatic Interferograms,
  Proceedings of 6th International Symposium on Image and Signal Processing and Analysis, ISPA 2009, pp.277-282, ISBN 978-953-184-135-1, (2009), University of Salzburg
  conference paper
  akce: Image and Signal Processing and Analysis 2009, Salzburg, 16.09.2009-18.09.2009
• KŘUPKA, I.; HARTL, M.; VRBKA, M.; VAVERKA, M.; POLIŠČUK, R.:
  Effect of surface dents on contact pressure in elastohydrodynamic contacts,
  PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, Vol.223, (2009), No.4, pp.683-693, ISSN 1350-6501, Professional Engineering Publishing
  journal article - other
• KŘUPKA, I.; HARTL, M.; POLIŠČUK, R.:
  Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces,
  Tribology International, Vol.42, (2008), No.X, pp.1-7, ISSN 0301-679X, Elsevier
  journal article - other
• VAVERKA, M.; VRBKA, M.; POLIŠČUK, R.; KŘUPKA, I.; HARTL, M.:
  Numerical evaluation of pressure from experimentally measured film thickness in EHL point contact,
  Lubrication Science, Vol.20, (2008), No.1, pp.47-59, ISSN 0954-0075, John Wiley & Sons, Ltd.
  journal article - other
• POLIŠČUK, R.; VAVERKA, M.; VRBKA, M.; KŘUPKA, I.; HARTL, M.:
  Optimized Mapping of Pressure in Lubricated Point Contacts Based on Measured Film Thickness,
  Proceedings of the 2007 International Mechanical Engineering Congress & Exposition, pp.DVD-5, ISBN 0-7918-3812-9, (2007), ASME
  conference paper
  akce: 2007 International Mechanical Engineering Congress & Exposition, Seattle, 11.11.2007-15.11.2007
• VRBKA, M.; VAVERKA, M.; POLIŠČUK, R.; KŘUPKA, I.; HARTL, M.:
  Pressure Calculation from Experimentally Evaluated Lubricant Thickness within EHL Contacts,
  Proceedings of the ASME/STLE International Joint Tribology Conference 2007, pp.1-3, ISBN 978-0-7918-4810-4, (2007), ASME/STLE
  conference paper
  akce: ASME/STLE International Joint Tribology Conference 2007, San Diego Marriott Mission Valley 8757 Rio San Diego Drive San Diego, California 92108 USA, 22.10.2007-24.10.2007
• KŘUPKA, I.; HARTL, M.; POLIŠČUK, R.:
  The Effect of Boundary Films on Dented Surfaces Operated under Thin EHD Lubrication,
  Ecotrib 2007, pp.745-754, ISBN 978-961-90254-8-2, (2007), Slovenian society for tribology
  conference paper
  akce: Ecotrib 2007, Ljubljana, 12.06.2007-15.06.2007
• POLIŠČUK, R.; VAVERKA, M.; VRBKA, M.; KŘUPKA, I.; HARTL, M.:
  Pressure Distribution Within EHD Point Contacts Based on Measured Film Thickness,
  Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition IMECE2006, pp.DVD-6, ISBN 0-7918-3790-4, (2006), Pinehurst Technologies, Inc.
  conference paper
  akce: 2006 ASME International Mechanical Engineering Congress and Exposition, Chicago, 05.11.2006-10.11.2006
• VRBKA, M.; VAVERKA, M.; POLIŠČUK, R.; KŘUPKA, I.; HARTL, M.; URBANEC, L.:
  Evaluation of pressure from film thickness within EHL contact with dented surfaces,
  AITC-AIT 2006 5th International Conference of Tribology, pp.1-11, ISBN 88-902333-0-3, (2006)
  conference paper
  akce: 5th International Conference of Tribology 2006, Parma, Itálie, 20.09.2006-22.09.2006
• VRBKA, M.; VAVERKA, M.; POLIŠČUK, R.; KŘUPKA, I.; HARTL, M.:
  Vliv mazivostních přísad na tloušťku mazacího filmu v EHD kontaktu,
  Mazání v moderním průmyslovém podniku, pp.90-95, ISBN 80-02-01808-7, (2006), Česká strojnická společnost
  conference paper
  akce: Mazání v moderním průmyslovém podniku, Nové Město na Moravě, 19.04.2006-20.04.2006
• POLIŠČUK, R.:
  Barevné vidění při měření tloušťky mazacího filmu,
  Jemná mechanika a optika, Vol.49, (2004), No.9, pp.238-241, ISSN 0447-6441, Nakladatelství Fyzikálního ústavu Akademie věd České republiky
  journal article - other
• HARTL, M., LIŠKA, M., POLIŠČUK, R., KŘUPKA, I.:
  Dimple phenomena study by dichromatic colorimetric interferometry,
  International Tribology Conference ITC Nagasaki 2000, pp.982.543945, (2000), Japanese Society of Tribologists
  conference paper
• KŘUPKA, I., LIŠKA, M., HARTL, M., POLIŠČUK, R.:
  Experimental Evaluation of EHD Film Shape and Its Comparison With Numerical Solution,
  ASME Transaction, Journal of Tribology, Vol.122, (2000), No.4, pp.689-696, ISSN 0742-4787
  journal article - other
• KŘUPKA, I., LIŠKA, M., HARTL, M., POLIŠČUK, R.:
  Experimental Study of Central and Minimum Elastohydrodynamic Film Thickness by Colorimetric Interferometry,
  Tribology Transactions, Vol.43, (2000), No.4, pp.611-618, ISSN 0569-8197
  journal article - other
• HARTL, M., LIŠKA, M., POLIŠČUK, R., KŘUPKA, I.:
  Thin Film Lubrication Study by Colorimetric Interferometry,
  26th Leeds-Lyon Symposium on Tribology, pp.695-704, ISBN 0-444-50531-8, (2000), Elsevier
  conference paper
• KŘUPKA, I., LIŠKA, M., POLIŠČUK, R., HARTL, M.:
  An Experimental Study of Elastohydrodynamic Central and Minimum Film Thickness for Various Material Parameters,
  Lubrication Science, Vol.12, (2000), No.5, pp.239-251, ISSN 0954-0075
  journal article - other
• HARTL, M., LIŠKA, M., POLIŠČUK, R., KŘUPKA, I.:
  Experimental study of elastohydrodynamic central and minimum film thickness for various material parameters,
  NORDTRIB98: Proceedings of the 8th International Conference, pp.329-335, ISBN 87-7756-49, (1998), SPIE
  book chapter

List of publications at Portal BUT

Abstracts of most important papers:

• KŘUPKA, I.; HARTL, M.; POLIŠČUK, R.; ŠAMÁNEK, O.; VRBKA, M.; VAVERKA, M.:
  Effect of surface texturing on lubrication film formation within non-conformal contacts,
  5th China International Symposium on Tribology/1st International Tribology Symposium of IFToMM, pp.84-85, ISBN 978-7-302-20422-0, (2009), TSINGHUA UNIVERSITY PRESS, TSINGHUA UNIVERSITY HAIDIANQU, BEIJING 100084, PEOPLES R CHINA
  conference paper
  akce: 5th China International Symposium on Tribology/1st International Tribology Symposium of IFToMM , Beijing, 24.09.2008-27.09.2008
  The paper is focused on the influence of surface texturing in non-conformal contacts on lubricant film thickness, contact pressure and rolling contact fatigue (RCF). Both the possible negative and positive effects of surface texturing are considered. The lubricant film thickness was measured using experimental apparatus based on thin film colorimetric interferometry, where the contact is realized between steel ball and glass disc. The RCF test rig consists of two discs loaded and running against roller specimen. The test results show that shallow micro-dents could be considered as beneficial to improve RCF of machine parts under mixed lubrication.
• KŘUPKA, I.; HARTL, M.; VRBKA, M.; VAVERKA, M.; POLIŠČUK, R.:
  Effect of surface dents on contact pressure in elastohydrodynamic contacts,
  PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, Vol.223, (2009), No.4, pp.683-693, ISSN 1350-6501, Professional Engineering Publishing
  journal article - other
  Nowadays film thickness measurement techniques can provide precise data for the detailed studies of the behaviour of lubricated contacts including transient operational conditions. Contact pressure is in relation with deformation of rubbing surfaces, which can be derived from experimentally evaluated film thickness. Even though the pressure distribution evaluated from measured film thickness is very sensitive to its accuracy, this approach represents a powerful tool for elastohydrodynamic pressure determination thanks to the relative wide availability of film thickness measurement techniques. Chromatic interferograms can be captured within a few microseconds so that this approach seems to be promising in obtaining relevant pressure data even within non-smooth lubricated contacts. This paper presents the results of the effort to extend the applicability of the pressure-film thickness evaluation approach to the non-smooth surfaces. It was found that the main problem is to obtain the film thickness distribution within the whole contact including the inside portion of the deep surface features (e.g. dents). That is why the combination of film thickness data and undeformed dent topography was suggested to overcome these limitations. This approach was validated through the comparison with numerical solution using dented surface and was tested on selected dented contacts operated under thin film and very thin film lubrication conditions.
• KŘUPKA, I.; HARTL, M.; POLIŠČUK, R.:
  Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces,
  Tribology International, Vol.42, (2008), No.X, pp.1-7, ISSN 0301-679X, Elsevier
  journal article - other
  Thin film colorimetric interferometry was used to map changes in film thickness in the vicinity of micro-dents of various depths produced on rubbing surfaces. It has been shown in recent studies that shallow micro-features within concentrated contact can increase mean film thickness by supplying more lubricant to the contact; however, this beneficial effect can also be accompanied by a local film thickness reduction. Nevertheless, these observations were done with mineral base oils that exhibited no boundary films formation. In this study the behavior of micro-textured surfaces are observed using formulated lubricant containing polyalcylmethacrylate (PAMA), viscosity index improver with boundary film forming properties. Obtained results show that an enlarged film thickness due to the presence of viscous boundary films is formed within the whole contact and these boundary films minimize the local film thickness reduction caused by micro-dents and further increase the efficiency of surface texturing within non-conformal contacts. It can be suggested from the obtained results that joint action of both boundary film formation and surface texturing combines both contributions that can help to increase tribological performances in different stages of machine parts operation by increasing lubrication film thickness.
• VAVERKA, M.; VRBKA, M.; POLIŠČUK, R.; KŘUPKA, I.; HARTL, M.:
  Numerical evaluation of pressure from experimentally measured film thickness in EHL point contact,
  Lubrication Science, Vol.20, (2008), No.1, pp.47-59, ISSN 0954-0075, John Wiley & Sons, Ltd.
  journal article - other
  This paper is concerned with elastohydrodynamic lubrication, especially the determination of lubricant film thickness and contact pressure within a point contact of friction surfaces of machine parts. A new solution technique for numerical determination of contact pressure is introduced. The direct measurement of contact pressure is very difficult. Hence, input data of lubricant film thickness obtained from the experiment based on colorimetric interferometry are used for the calculation of pressure using the inverse elasticity theory. The algorithm is enhanced by convolution in order to increase calculation speed. The approach described in this contribution gives reliable results on smooth contact and in the future, it will be extended to enable the study of contact of friction surfaces with asperities.
• KŘUPKA, I., LIŠKA, M., POLIŠČUK, R., HARTL, M.:
  An Experimental Study of Elastohydrodynamic Central and Minimum Film Thickness for Various Material Parameters,
  Lubrication Science, Vol.12, (2000), No.5, pp.239-251, ISSN 0954-0075
  journal article - other
  A newly developed experimental technique, based on colorimetric interferometry, has allowed accurate measurement of central and minimum elastohydrodynamic (EHD)film thickness for a wide range of operating conditions. This study was aimed at determinimg the influence of various material parameters on central and minimum EHD film thicknesses. Obtained experimental data were compared with Hamrock and Dowson film thickness equations and a numerical solution presented by Venner. The results obtained confirmed that the ratio between central and minimum film thicknesses changes significantly with both load and material parameters.