Ing. Milan Omasta, Ph.D.
E-mail:   omasta@fme.vutbr.cz  Dept.:   Institute of Machine and Industrial Design Dept. of Tribology Position:   Assistant Professor Room:   A3/508

Supervised courses:

• Selected chapters from machine design – mechanical drives (0KU)

Publications:

• WANG, J.; LUBRECHT, AA.; ŠPERKA, P.; OMASTA, M.; KANETA, M.:
  Effect of high slide-roll ratio on thermal elastohydrodynamic lubrication in line contacts with surface waviness, Sage
  journal article in Web of Science
• OMASTA, M.; MACHATKA, M; SMEJKAL, D.; KŘUPKA, I.; HARTL, M.:
  Influence of sanding parameters on adhesion recovery in contaminated wheel–rail contact, Elsevier
  journal article in Web of Science
• PALOUŠEK, D.; OMASTA, M.; KOUTNÝ, D.; BEDNÁŘ, J.; DOKOUPIL, F.; KOUTECKÝ, T.:
  Effect of matte coating on 3D optical measurement accuracy, Elsevier
  journal article in Web of Science
• JANALIK, P.; FICHTER, T.; ŠPERKA, P.; OMASTA, M.; RAUSER, P.:
  Three-dimensional optical assessment of experimental iatrogenic mechanical damage to canine dental enamel caused by a sonic scaler, CZECH ACADEMY AGRICULTURAL SCIENCES
  journal article in Web of Science
• Galas Radovan, Smejkal David, Omasta Milan, Hartl Martin:
  Twin-disc Experimental Device for Study of Adhesion in Wheel-rail Contact
• GALAS, R.; OMASTA, M.:
  The Effect of Friction Modifier on the Wheel-Rail Contact,
  55th International Conference of Machine Design Departments, pp.123-128, ISBN 978-80-01-05542-7, (2014)
  conference paper
  akce: 55th International Conference of Machine Design Departments, Beroun, 09.09.2014-12.09.2014
• FRÝZA, J.; OMASTA, M.:
  The Experimental Determination of the Grease Amount to Effective Wear Reduction in the Wheel-Rail Contact,
  Book of Proceedings of the 55th International Conference of Machine Design Departments, pp.117-122, ISBN 978-80-01-05542-7, (2014)
  conference paper
  akce: 55th International Conference of Machine Design Departments, Beroun, 09.09.2014-12.09.2014
• GALAS, R.; SMEJKAL, D.; OMASTA, M.; HARTL, M.:
  Twin-Disc Experimental Device for Study of Adhesion in Wheel-Rail Contact,
  Engineering Mechanics, Vol.21, (2014), No.5, pp.329-334, ISSN 1805-4633, Association for Engineering Mechanics
  journal article - other
• HARTL, M.; KŘUPKA, I.; OMASTA, M.; ŠPERKA, P.:
  Recent Advances and Problems in Lubricated Hertzian Contacts,
  Engineering Mechanics 2014, pp.34-38, ISBN 978-80-214-4871-1, (2014), Brno University of Technology
  conference paper
  akce: Engineering Mechanics 2014, Svratka, 12.05.2014-15.05.2014
• OMASTA, M.; FRÝZA, J.; HARTL, M.; KŘUPKA, I.:
  Study of Effects of Wheel Flange/Rail Gauge Contact Lubrication,
  Proceedings of World Tribology Congres 2013, pp.3007-3009, ISBN 9781634393522, (2013), Politecnico di Torino (DIMEAS)
  conference paper
  akce: 5th World Tribology Congress, Turín, 08.09.2013-13.09.2013
• STAHL, K.; MICHAELIS, K.; MAYER, J.; WEIGL, A.; LOHNER, T.; OMASTA, M.; HARTL, M.; KŘUPKA, I.:
  Theoretical and Experimental Investigations on EHL Point Contacts with Different Entrainment Velocity Directions,
  TRIBOLOGY TRANSACTIONS, Vol.56, (2013), No.5, pp.728-738, ISSN 1040-2004, Taylor & Francis
  journal article - other
• OMASTA, M.; FRÝZA, J.; HARTL, M.; KŘUPKA, I.:
  An experimental approach to the study of rail wheel/flange lubrication,
  Society of Tribologists & Lubrication Engineers Annual Meeting & Exhibition 2013 / Proceedings of a meeting held 5-9 May 2013, Detroit, Michigan, USA., pp.1-3, ISBN 978-1-62993-289-7, (2013), Society of Tribologists and Lubrication Engineers
  conference paper
  akce: STLE 2012 Annual Meeting & Exhibition, Renaissance Grand & America's Center St. Louis, Missouri (USA) , 06.05.2012-10.05.2012
• OMASTA, M.; KŘUPKA, I.; HARTL, M.:
  Effect of Surface Velocity Directions on Elastohydrodynamic Film Shape, Taylor & Francis
  journal article in Web of Science
• OMASTA, M.; KŘUPKA, I.; HARTL, M.:
  THE CONTRIBUTION OF A SLIDING VELOCITY TO EHL FILM THICKNESS DISTRIBUTION,
  ASME/STLE 2012 International Joint Tribology Conference, pp.1-3, ISBN 978-0-7918-4508-0, (2012), ASME/STLE
  conference paper
  akce: ASME/STLE 2012 International Joint Tribology Conference, Denver, 2012, Denver, Colorado, USA, 08.10.2012-10.10.2012
• OMASTA, M.:
  Tribology of Wheel-Rail Contact: a Review of Laboratory Experimental Research,
  Conference Proceedings - 53 rd International Conference of Machine Design Departments, September 12-14, 2012 Mikulov, Czech Republic, pp.219-222, ISBN 978-80-214-4533-8, (2012)
  conference paper
  akce: 53rd International Conference of Machine Design Departments, Mikulov, 12.09.2012-14.09.2012
• OMASTA, M.; HARTL, M.; KŘUPKA, I.:
  EFFECT OF SURFACE VELOCITY DIRECTIONS ON EHD FILM SHAPE,
  STLE 2012 Annual Meeting & Exhibition, pp.1-3, ISBN 978-0-7918-4508-0, (2012), Society of Tribologists and Lubrication Engineers
  conference paper
  akce: STLE 2012 Annual Meeting & Exhibition, Renaissance Grand & America's Center St. Louis, Missouri (USA) , 06.05.2012-10.05.2012
• OMASTA, M.; PALOUŠEK, D.; NÁVRAT, T.; ROSICKÝ, J.:
  Finite element analysis for the evaluation of the structural behaviour, of a prosthesis for trans-tibial amputees, ELSEVIER SCI LTD
  journal article in Web of Science
• OMASTA, M.; KŘUPKA, I.; HARTL, M.:
  Study of elastohydrodynamic film shape under different directions of velocity vectors,
  ASME/STLE 2011 International Joint Tribology Conference, pp.1-3, ISBN 978-0-7918-5474-7, (2011), ASME/STLE
  conference paper
  akce: ASME/STLE 2011 International Joint Tribology Conference, Los Angeles, 2011, Los Angeles, CA, 24.10.2011-26.10.2011
• OMASTA, M.; KŘUPKA, I.; HARTL, M.:
  Effect of surface velocity directions on elastohydrodynamic film shape,
  ECOTRIB 2011, pp.531-532, ISBN 978-3-901657-38-2, (2011), The Austrian Tribology Society
  conference paper
  akce: 3rd European Conference on Tribology, Vídeň, 07.06.2011-09.06.2011
• OMASTA, M.:
  Simulace mazaného kontaktu mezi boky zubů hypoidních převodů,
  Zborník referátov, 51. Medzinárodná vedecká konferencia katedier časti a mechanizmov strojov, pp.225-228, ISBN 978-80-970-294-1-8, (2010), C-PRESS - Vydavatelstvo a tlačiareň, Košice
  conference paper
  akce: 51. Medzinárodná vedecká konferencia katedier častí a mechanizmov strojov, Čingov, 08.09.2010-10.09.2010
• PALOUŠEK, D.; NÁVRAT, T.; OMASTA, M.; ŠESTÁK, J.:
  Loading character of transtibial prosthesis,
  Modeling and optimization of physical systems, pp.79-84, ISBN 978-83-60102-50-3, (2008), Wydawnictvo Katedry Mechaniki Stosowanej
  conference paper
  akce: 12th International Seminar of Applied Mechanics, Wisla, 13.06.2008-15.06.2008

List of publications at Portal BUT

Abstracts of most important papers:

• OMASTA, M.; MACHATKA, M; SMEJKAL, D.; KŘUPKA, I.; HARTL, M.:
  Influence of sanding parameters on adhesion recovery in contaminated wheel–rail contact, Elsevier
  journal article in Web of Science
  In this work a new twin-disc machine in scale 1:3 was developed and addressed to the study of wheel/rail adhesion under different contact conditions. An influence of sanding parameters such as sand quantity, wheel slip and rolling speed was investigated using a real sanding system in the contact contaminated with water, leaves and wheel flange grease. It has been shown that under wet, leaf or grease contamination, quantity of the sand applied during fixed time period has significant effect on adhesion recovery only for low wheel slip and low rolling speed. In the contaminated contact the effect of sanding on adhesion recovery increases with wheel slip and rolling speed.
• STAHL, K.; MICHAELIS, K.; MAYER, J.; WEIGL, A.; LOHNER, T.; OMASTA, M.; HARTL, M.; KŘUPKA, I.:
  Theoretical and Experimental Investigations on EHL Point Contacts with Different Entrainment Velocity Directions,
  TRIBOLOGY TRANSACTIONS, Vol.56, (2013), No.5, pp.728-738, ISSN 1040-2004, Taylor & Francis
  journal article - other
  This study investigates the effect of different lubricant entrainment velocity angles on film thickness distribution. For this purpose, a steady-state isothermal EHL model is used under a wide range of parameter sets including varying sum velocity, contact pressure, and sum velocity angle. The results are compared with experimental measurements by means of an optical ball-on-disc tribometer and a twin-disc machine using capacitance method.
• OMASTA, M.; KŘUPKA, I.; HARTL, M.:
  Effect of Surface Velocity Directions on Elastohydrodynamic Film Shape, Taylor & Francis
  journal article in Web of Science
  This article is focused on the effects of the angle between lubricant entrainment velocity and sliding velocity on elastohydrodynamic film thickness distribution. Thin-film colorimetric interferometry was used to evaluate the film thickness distribution in smooth glass–steel contacts to provide basic data on the effects of the slide–roll ratio and the direction of sliding with respect to entrainment velocity.
• OMASTA, M.; PALOUŠEK, D.; NÁVRAT, T.; ROSICKÝ, J.:
  Finite element analysis for the evaluation of the structural behaviour, of a prosthesis for trans-tibial amputees, ELSEVIER SCI LTD
  journal article in Web of Science
  This paper focuses on the finite element analysis for the evaluation of structural behaviour of the Sure-flex prosthetic foot and other load-bearing components.