doc. Ing. Ivan Mazůrek, CSc.
E-mail:   mazurek@fme.vutbr.cz  Dept.:   Institute of Machine and Industrial Design Dept. of Condition Monitoring Position:   Associate Professor Room:   B1/112

Supervised courses:

• Machine Design - Mechanisms, 3D Print and Solidworks (6KM)
• Machine Design - Mechanisms, 3D Print and Solidworks (6KM)
• Measurement and Experiment (ZEM)

Publications:

• MAZŮREK, I.; ROUPEC, J.; KLAPKA, M.; STRECKER, Z.:
  Load and rheometric unit for the test of magnetorheological fluid,
  MECCANICA, Vol.48, (2013), No.3, pp.631-641, ISSN 0025-6455, Springer Netherlands
  journal article - other
• ROUPEC, J.; MAZŮREK, I.; STRECKER, Z.; KLAPKA, M.:
  The Behavior of the MR Fluid During Durability Test,
  Journal of Physics: Conference Series, Vol.412, (2012), No.1, pp.1-8, ISSN 1742-6588, IOP Publishing
  journal article - other
  akce: 13th International Conference on Electrorheological Fluids and Magnetorheological Suspensions, Ankara, 02.07.2012-06.07.2012
• KLAPKA, M.; MAZŮREK, I.:
  Assessment of the stub-shaft sleeve bearing chaotic behavior in automotive differential,
  Mechatronics: Recent technological and scientific advances., pp.303-308, ISBN 978-3-642-23243-5, (2011), Springer-Verlag Berlin Heidelberg
  conference paper
  akce: 9th International Conference Mechatronics 2011, Varšava, 21.09.2011-24.09.2011
• ROUPEC, J.; MAZŮREK, I.:
  Stability of magnetorheological effect during long term operation,
  Mechatronics, pp.561-567, ISBN 978-3-642-23243-5, (2011), Springer-Verlag
  conference paper
  akce: 9th International Conference Mechatronics 2011, Varšava, 21.09.2011-24.09.2011
• KLAPKA, M.; MAZŮREK, I.; ROUPEC, J.:
  Radial flexible bearings suitable stiffness estimation, Springer Netherlands
  journal article in Web of Science

List of publications at Portal BUT

Abstracts of most important papers:

• MAZŮREK, I.; ROUPEC, J.; KLAPKA, M.; STRECKER, Z.:
  Load and rheometric unit for the test of magnetorheological fluid,
  MECCANICA, Vol.48, (2013), No.3, pp.631-641, ISSN 0025-6455, Springer Netherlands
  journal article - other
  The article describes the original design of a slit flow rheometer. The behavioural problems of MR fluids and the main deviation from the commonly introduced Bingham model, which describes the MR fluid, are explained at the beginning of this article. Furthermore, the usual operating parameters of the MR fluids and devices are defined, such as: shear rate, viscosity in the off-state, yield stress, their dependence on temperature and the expected life of the filling. In the absence of a suitable rheometer a new design of rheometer was proposed, which allows long-term testing of MR fluids under real loading conditions. This article describes the important details of the construction. Particular attention is devoted to temperature measurement, calibration of the rheometer and data analysis, including mathematical tools and statistical evaluation of a set of measured points.
• STRECKER, Z.; MAZŮREK, I.:
  Semiactive Damper in an Experimental Trolley Suspension,
  Proceedings of the 53rd International Conference of Machine Design Departments, pp.281-286, ISBN 978-80-214-4533-8, (2012), Brno University of Technology
  conference paper
  akce: 53rd International Conference of Machine Design Departments, Mikulov, 12.09.2012-14.09.2012
  The experimental trolley is a reduced version of a 1/4 car suspension. With the road simulator, it is possible to simulate behaviour of car suspension with different settings of the damper and sprung and unsprung masses. Because of reduction of the weights, it is necessary to set parameters of the trolley and the damper in such way that the modal features of the suspension should be similar to usual passenger car. The procedure of designing of the ideal damper for this trolley is shown in this article. Because of easy change of the damping characteristics without the need of damper changing, it is advantageous to use some semiactive damper. The semiactive damper based on a magnetorheological effect manufactured by Delphi company with some modifications is used here. For easy calculation of the parameters of the experimental trolley different configurations, model in Mathcad was created.
• KLAPKA, M.; MAZŮREK, I.:
  Assessment of the stub-shaft sleeve bearing chaotic behavior in automotive differential,
  Mechatronics: Recent technological and scientific advances., pp.303-308, ISBN 978-3-642-23243-5, (2011), Springer-Verlag Berlin Heidelberg
  conference paper
  akce: 9th International Conference Mechatronics 2011, Varšava, 21.09.2011-24.09.2011
  This article is concerned with capabilities of analysis of a chaotic behavior of the stub-shaft sleeve bearing inside the automotive differential. Analytical methods based on phase-trajectory diagrams and fractal dimensions are used. Effect of the chaotic behavior on automotive differential noise is examined as well. The purpose of the article is to give an overview of practical use of the above mentioned methods. The potential advantages, disadvantages are discussed as well as expected contributions of application of the bifurcation analysis to solving the automotive differential journal bearing noise problem.
• ROUPEC, J.; MAZŮREK, I.:
  Stability of magnetorheological effect during long term operation,
  Mechatronics, pp.561-567, ISBN 978-3-642-23243-5, (2011), Springer-Verlag
  conference paper
  akce: 9th International Conference Mechatronics 2011, Varšava, 21.09.2011-24.09.2011
  The article describes a determination of stability of magnetorheological (MR) effect during long term operation. The operation carried out in a cus-tom design rheometer, which is built in a mechanical pulsator. The rheom-eter design allows measurement of the rheological properties of MR fluid and its exposure to a long-term loading simultaneously, without any ma-nipulation of the measured sample. The operation ran under conditions which correspond to real conditions in the automotive MR damper. The results of long term operation show that during the durability test an yield stress increased up to five times in off-state due to in-use-thickening (IUT). The same increase was identified in on-state. These results disprove a hy-pothesis that a measurable decreasing of MR effect due to the degradation of magnetic properties arises during the long term operation.
• KLAPKA, M.; MAZŮREK, I.; ROUPEC, J.:
  Radial flexible bearings suitable stiffness estimation, Springer Netherlands
  journal article in Web of Science
  This article describes a technique for the differential bearings noise reduction. Noise results from the mechanical looseness of the differential gear and connected elements and it is activated by the vibrations of the engine. A test rig for simulation of the phenomenon outside vehicle has been designed and behavior of the differential bearing has been analyzed. Analytical software that is capable to classify the types of the noise has been created. The mathematical model enables estimation of suitable range of differential bearings radial stiffness. Finally, the selected solution is tested on the test rig, thus the technique is verified.