Ing. David Košťál, Ph.D.
E-mail:   kostal@fme.vutbr.cz 
Dept.:   Institute of Machine and Industrial Design
Dept. of Tribology
Position:   Assistant Professor
Room:   A3/609

Supervised courses:

Publications:

  • DONG, J.; SVOBODA, P.; VRBKA, M.; KOŠŤÁL, D.; URBAN, F.; ČÍŽEK, J.; ROUPCOVÁ, P.; DONG, H.; KŘUPKA, I.; HARTL, M.:
    Towards near-permanent CoCrMo prosthesis surface by combining micro-texturing and low temperature plasma carburising, Elsevier B.V.
    journal article in Web of Science
  • KOŠŤÁL, D.; ŠPERKA, P.; SVOBODA, P.; KŘUPKA, I.; HARTL, M.:
    Experimental observation of elastohydrodynamically lubricated contacts replenishment
    journal article in Scopus
  • KOŠŤÁL, D.; NEČAS, D.; ŠPERKA, P.; SVOBODA, P.; KŘUPKA, I.; HARTL, M.:
    Lubricant Rupture Ratio at Elastohydrodynamically Lubricated Contact Outlet, Springer
    journal article in Web of Science
  • SVOBODA, P.; KOŠŤÁL, D.; KŘUPKA, I.; HARTL, M.:
    Experimental study of starved EHL contacts based on thickness of oil layer in the contact inlet,
    Tribology International, Vol.67, (2013), No.1, pp.140-145, ISSN 0301-679X, ELSEVIER
    journal article - other
  • KOŠŤÁL, D.; ŠPERKA, P.; KŘUPKA, I.; HARTL, M.:
    Surface Roughness Effects in Starved EHL Contacts,
    Proceedings of World Tribology Congres 2013, pp.951-954, ISBN 9781634393522, (2013), Italian Tribology Association
    conference paper
    akce: 5th World Tribology Congress, Turín, 08.09.2013-13.09.2013
  • SVOBODA, P.; KOŠŤÁL, D.; POPELKA, M.; KŘUPKA, I.:
    The experimental study of transition between fully flooded and starved regime in EHL contact,
    Engineering Mechanics, Vol.20, (2013), No.1, pp.13-25, ISSN 1802-1484, Association for Engineering Mechanics
    journal article - other
  • SVOBODA, P.; KOŠŤÁL, D.; KŘUPKA, I.; HARTL, M.:
    EXPERIMENTAL STUDY OF LUBRICATION FILM FORMATION IN MULTIPLE CONTACTS DEVICE UNDER STARVED CONDITIONS,
    Proceedings of the ASME/STLE 2012 International Joint Tribology Conference, pp.233-235, ISBN 978-0-7918-4508-0, (2012), American Society of Mechanical Engineers, Tribology Division, TRIB
    conference paper
    akce: ASME/STLE 2012 International Joint Tribology Conference, Denver, 2012, Denver, Colorado, USA, 08.10.2012-10.10.2012

List of publications at Portal BUT

Abstracts of most important papers:

  • SVOBODA, P.; KOŠŤÁL, D.; KŘUPKA, I.; HARTL, M.:
    Experimental study of starved EHL contacts based on thickness of oil layer in the contact inlet,
    Tribology International, Vol.67, (2013), No.1, pp.140-145, ISSN 0301-679X, ELSEVIER
    journal article - other
    This paper describes the experimental approach based on the thickness of the oil layer entering the starved contact. Through the comparison with the theoretical prediction it was found that acceptable input conditions for the study of starved contacts can be achieved with such test rig configuration.
  • SVOBODA, P.; KOŠŤÁL, D.; POPELKA, M.; KŘUPKA, I.:
    The experimental study of transition between fully flooded and starved regime in EHL contact,
    Engineering Mechanics, Vol.20, (2013), No.1, pp.13-25, ISSN 1802-1484, Association for Engineering Mechanics
    journal article - other
    This paper deals with an experimental study of lubricant film in an experimental device (tribometer). Lubricating film is formed between a glass disc and steel ball on which modification for friction surfaces have been made. The experiment is aimed at both fully flooded EHL lubrication regime as well as the starved. This document also deals with a comparison of micro dents passage through a contact at different degrees of slip.
  • SVOBODA, P.; KOŠŤÁL, D.; KŘUPKA, I.; HARTL, M.:
    EXPERIMENTAL STUDY OF LUBRICATION FILM FORMATION IN MULTIPLE CONTACTS DEVICE UNDER STARVED CONDITIONS,
    Proceedings of the ASME/STLE 2012 International Joint Tribology Conference, pp.233-235, ISBN 978-0-7918-4508-0, (2012), American Society of Mechanical Engineers, Tribology Division, TRIB
    conference paper
    akce: ASME/STLE 2012 International Joint Tribology Conference, Denver, 2012, Denver, Colorado, USA, 08.10.2012-10.10.2012
    To achieve optimum bearing performance and component life, it is obviously desirable to be able to predict when starvation will occur. Today the film thickness and pressure in EHL can be predicted using numerical models also in the case of starvation. Although it is very essential to solve the starved EHL problems very little work aimed at comparing experiment and theory has been done. Especially in the case where the starved lubrication model requires as input the inlet layer thickness. This is crucial if the validity of numerical models is to be properly established. This understanding gives useful insight into the task for effective operation in regimes where starvation occurs.