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[popis] => Heat treatment of steel is tied to many problems. One of the important problems is the growth of the oxide scale layers and their removal in order to obtain high quality of steel surface. The problem of the oxide scales growth and descaling requires a complex analysis. Complexity of analysis also includes the study of mechanical properties of the oxide scale layers. To study the mechanical properties the small punch method was used. The typical result of the small punch tests is force-displacement curve. Small punch test can be considered analogous to a conventional tensile test. Therefore it is necessary to convert measured force-displacement curve to stress-strain curve. The conversion of the measured curves can be carried out by several methods such as analytical or numerical methods. In this paper the numerical method in ANSYS program was used to convert the measured force-displacement curves. Two material models were applied and results for all examined specimens are compared and presented.
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title="How to build a robot with no money, merkur, lego and old stepper motor.",
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[popis_en] => Robot localization and path planning belong to the actual problem in robotics. Markov localization seems to be currently the most promissing localization method in known environment. The method is based on calculation and update of the probability distribution of "beig at certain location". In this paper we describe our simple real robots which were used for theoretical principles verification.
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[citace_text] => MARADA, T., BŘEZINA, T., SINGULE, V. The Q-learned controller for small asynchronous electromotor. In Mechatronika 2005. Trenčianske Teplice, Slovakia: Fakulta Mechatroniky TnU AD v spolupráci s firmou GC TECH Ing. Peter Gerši, 2005. 5 p. ISBN: 80-8075-058-0.
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considers the suitability of their use. A tree is used to represent and describe the state space. The tree is generated using
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[popis] => Surface topography significantly influences the behavior of lubricated contacts between highly loaded machine elements. Most oil- or grease- lubricated machine elements such as gears, rolling bearings, cams and traction drives operate in mixed lubrication conditions and the lubricant film thickness is directly related to the main practical performance parameters such as friction, wear, contact fatigue and scuffing. For determination wear and especially contact fatigue, the values and distribution of the pressure in rolling contact are required. The theoretical studies usually involve the numerical solution of pressure and film thickness in the contact, using some physical mathematical model built around the Reynolds equation to describe the flow and the theory of elastic deformation of semi-infinite bodies. Such calculations can be extremely time consuming, especially when lubricant films are very thin and/or contact load very high. This study is aimed at obtaining pressure distribution within lubricated contact from measured film thickness. Lubricant film thickness distribution within the whole concentrated contact is evaluated from chromatic interferograms by thin film colorimetric interferometry. Consequently, an elastic deformation is separated from the film thickness, geometry and mutual approach of the surfaces. Calculation of the pressure distribution is based on inverse elasticity theory. EHD lubricated contact with smooth surfaces of solids was first investigated. Calculated pressure distributions were compared with data obtained from full numerical solution to check the accuracy. The approach was also applied to surfaces with dents and their influence on distribution of pressure in lubricant film.
[popis_orig] => Surface topography significantly influences the behavior of lubricated contacts between highly loaded machine elements. Most oil- or grease- lubricated machine elements such as gears, rolling bearings, cams and traction drives operate in mixed lubrication conditions and the lubricant film thickness is directly related to the main practical performance parameters such as friction, wear, contact fatigue and scuffing. For determination wear and especially contact fatigue, the values and distribution of the pressure in rolling contact are required. The theoretical studies usually involve the numerical solution of pressure and film thickness in the contact, using some physical mathematical model built around the Reynolds equation to describe the flow and the theory of elastic deformation of semi-infinite bodies. Such calculations can be extremely time consuming, especially when lubricant films are very thin and/or contact load very high. This study is aimed at obtaining pressure distribution within lubricated contact from measured film thickness. Lubricant film thickness distribution within the whole concentrated contact is evaluated from chromatic interferograms by thin film colorimetric interferometry. Consequently, an elastic deformation is separated from the film thickness, geometry and mutual approach of the surfaces. Calculation of the pressure distribution is based on inverse elasticity theory. EHD lubricated contact with smooth surfaces of solids was first investigated. Calculated pressure distributions were compared with data obtained from full numerical solution to check the accuracy. The approach was also applied to surfaces with dents and their influence on distribution of pressure in lubricant film.
[klicova_slova] => Tribology; interferometry; colorimetry; thin films; pressure mapping
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[citace_text] => POLIŠČUK, R.; VAVERKA, M.; VRBKA, M.; KŘUPKA, I.; HARTL, M. Pressure Distribution Within EHD Point Contacts Based on Measured Film Thickness. In Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition IMECE2006. Chicago, Illinois USA: Pinehurst Technologies, Inc., 2006. 7 p. ISBN: 0-7918-3790-4.
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[nazev_en] => Pressure Distribution Within EHD Point Contacts Based on Measured Film Thickness
[popis_en] => Surface topography significantly influences the behavior of lubricated contacts between highly loaded machine elements. Most oil- or grease- lubricated machine elements such as gears, rolling bearings, cams and traction drives operate in mixed lubrication conditions and the lubricant film thickness is directly related to the main practical performance parameters such as friction, wear, contact fatigue and scuffing. For determination wear and especially contact fatigue, the values and distribution of the pressure in rolling contact are required. The theoretical studies usually involve the numerical solution of pressure and film thickness in the contact, using some physical mathematical model built around the Reynolds equation to describe the flow and the theory of elastic deformation of semi-infinite bodies. Such calculations can be extremely time consuming, especially when lubricant films are very thin and/or contact load very high. This study is aimed at obtaining pressure distribution within lubricated contact from measured film thickness. Lubricant film thickness distribution within the whole concentrated contact is evaluated from chromatic interferograms by thin film colorimetric interferometry. Consequently, an elastic deformation is separated from the film thickness, geometry and mutual approach of the surfaces. Calculation of the pressure distribution is based on inverse elasticity theory. EHD lubricated contact with smooth surfaces of solids was first investigated. Calculated pressure distributions were compared with data obtained from full numerical solution to check the accuracy. The approach was also applied to surfaces with dents and their influence on distribution of pressure in lubricant film.
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[citace_text] => VĚCHET, S.; KREJSA, J.; ONDROUŠEK, V. DETERMINATION OF PROBABILISTIC MODEL OF ROBOT MOTION. In Engineering Mechanics 2007. 2007. Praha: Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague, 2007. p. 311-312. ISBN: 978-80-87012-06-2.
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[citace_text] => ONDROUŠEK, V.; BŘEZINA, T.; KREJSA, J. Simulation Testing Of Algorithms Generating Robot's Walking Gaits. In Production Machines Automation 2007. Praha: České Vysoké Učení Technické v Praze, Fakulta Strojní, 2007. p. 122-127. ISBN: 80-01-03660-X.
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[quotations] => MARADA, T., BŘEZINA, T., SINGULE, V.
[title] => The Q-learned controller for small asynchronous electromotor
[typ] => PV
[year] => 2005
[id_vav] => 16176
)
[4] => Array
(
[quotations] => MARADA, T., BŘEZINA, T.,
[title] => The effect of selected variables on Q-learning during the control of asynchronous electric motor
[typ] => PV
[year] => 2005
[id_vav] => 16177
)
[5] => Array
(
[quotations] => S. Věchet, J. Krejsa
[title] => Fast solution of the mobile localization problem.
[typ] => PV
[year] => 2006
[id_vav] => 20000
)
[6] => Array
(
[quotations] => ONDROUŠEK, V.; BŘEZINA, T.; KREJSA, J.
[title] => The Walking Policies Automatic Generation Using Beam Search
[typ] => PV
[year] => 2006
[id_vav] => 20035
)
[7] => Array
(
[quotations] => POLIŠČUK, R.; VAVERKA, M.; VRBKA, M.; KŘUPKA, I.; HARTL, M.
[title] => Pressure Distribution Within EHD Point Contacts Based on Measured Film Thickness
[typ] => PV
[year] => 2006
[id_vav] => 20087
)
[8] => Array
(
[quotations] => VĚCHET, S.; KREJSA, J.; ONDROUŠEK, V.
[title] => DETERMINATION OF PROBABILISTIC MODEL OF ROBOT MOTION
[typ] => PV
[year] => 2007
[id_vav] => 23994
)
[9] => Array
(
[quotations] => ONDROUŠEK, V.; BŘEZINA, T.; KREJSA, J.
[title] => Simulation Testing Of Algorithms Generating Robot's Walking Gaits
[typ] => PV
[year] => 2007
[id_vav] => 24492
)
[10] => Array
(
[quotations] => BŘEZINA, T.; BŘEZINA, L.
[title] => THE DEVICE FOR IMPLANTS TESTING:THE DESIGN OF CONTROL
[typ] => PV
[year] => 2008
[id_vav] => 27528
)
[11] => Array
(
[quotations] => HOUŠKA, P.; ONDROUŠEK, V.; HOUFEK, M.; VĚCHET, S.
[title] => Possibilities of control experimental testing devices for biomechanics
[typ] => PV
[year] => 2007
[id_vav] => 28028
)
[12] => Array
(
[quotations] => ONDROUŠEK, V.; KREJSA, J.; VĚCHET, S.; HOUŠKA, P.
[title] => Verification of the walking gait generation algorithms using branch and bound methods
[typ] => PV
[year] => 2007
[id_vav] => 30269
)
[13] => Array
(
[quotations] => BŘEZINA, T.; FLORIAN, Z.; CABALLERO, A.
[title] => The Design of the Device for Cord Implants Tuning
[typ] => PV
[year] => 2007
[id_vav] => 30271
)
)
)