4 results on '"Lazović, Tatjana"'
Search Results
2. From Innovation to Standardization—A Century of Rolling Bearing Life Formula.
- Author
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Lazović, Tatjana, Marinković, Aleksandar, Atanasovska, Ivana, Sedak, Miloš, and Stojanović, Blaža
- Subjects
SERVICE life ,ROLLER bearings ,DYNAMIC loads ,PROBABILITY theory ,CRITICAL analysis - Abstract
This review paper is an homage to Arvid Palmgren's pioneering paper on rolling bearing service life to highlight its relevance a century later. It follows the evolution of bearing service life theory from Palmgren's fundamental research to the contemporary international standard ISO 281. Palmgren's theory, based on the previously published papers of Stribeck and Hertz, laid the basis for the later development of bearing service life assessment methodology. Based on the Weibull theory of probability of damage, Lundberg and Palmgren introduced stochastic elements to explain the effect of reliability on bearing service life prediction. Harris and Ioannides, who made a significant contribution to the revision of the international standard on rolling bearing load rating and rating life are mentioned as well. Zaretsky's critical analysis also was not neglected in this review, due to a different approach respecting the original influence of material properties and bearing performances. Despite standardization, ongoing research by leading advanced bearing industries and academic institutions continues to refine methodologies for service life assessment. Through a comprehensive review and analysis, this paper offers insight into the current state of bearing service life theory, highlighting the collaborative efforts bringing progress in this field. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Analysis of Lubrication Regimes for Porous Sliding Bearing.
- Author
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Marinković, Aleksandar, Stojanović, Blaža, Gachot, Carsten, and Lazović, Tatjana
- Subjects
POROUS metals ,BOUNDARY lubrication ,HYDRODYNAMIC lubrication ,SERVICE life ,FRICTION ,LUBRICATION & lubricants ,ELASTOHYDRODYNAMIC lubrication - Abstract
The purpose of this paper is to analyze the lubrication quality of porous sliding bearings, starting from the bearing model and in combination with experimental results aimed at analyzing the lubrication regimes of different working conditions. The separation between the surfaces by the lubricant layer is what determines the regime. The quality and type of lubrication regime are determined by parameters in the mathematical model including typically speed, load, motion, materials, environment, etc., which have an impact on friction. Besides those elements, important parameters such as coefficient of friction (COF) and working temperature are to be measured due to experimental investigations to detect an equilibrium working state. The self-lubrication mechanism in porous metal bearings improves their service life and lubrication processes; however, the COF still varies within a wide interval. This variability can be understood, considering that during bearing operation it operates within a broad range of lubrication regimes. Those findings are explained in the paper by using a combination of calculated parameters according to the bearing model and in combination with our own results of experimental investigations. With the obtained results for particular working conditions, the authors are trying to explain, in the form of a diagram with the limit line as an important outcome of the work, that the lubrication regime for porous metal bearings could arise from boundary lubrication (BL) close to hydrodynamic lubrication (HDL). [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Утицај концентрације експлоатационих честица нечистоћа на радне карактеристике котрљајних лежаја
- Author
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Mišković, Žarko Z., Mitrović, Radivoje, Ristivojević, Mileta, Lazović, Tatjana, Stamenić, Zoran, and Kuzmanović, Siniša
- Subjects
Conveyor idlers ,rolling bearings ,абразивно хабање ,радијални зазор ,statistical correlations ,методологија испитивања ,vibrations ,Транспортни ваљци ,testing methodology ,temperatures ,процедуре испитивања ,радни век ,котрљајни лежаји ,температуре ,статистичке корелације ,testing procedure ,internal radial clearance ,вибрације ,abrasive wear ,service life - Abstract
Информације из стручне литературе, као и искуствени подаци, показују да велики проценат енергетских губитака термоелектрана потиче од система тракастих транспортера и њихових кључних компоненти – транспортних (носећих) ваљака. Зато су управо ови склопови, чија је функција да пренесу оптерећење услед масе транспортне траке и транспортованог терета на носећи рам, изабрани за објекат истраживања дисертације. Са циљем повећања поузданости, и смањења финансијских и енергетских губитака узрокованих непланираним отказима, развијене су нове и унапређене постојеће експерименталне процедуре за испитивање кључних карактеристика транспортних ваљака – обједињене у комплексну експерименталну методологију испитивања. Међу развијеним процедурама, по значају се посебно истиче процедура за испитивање радних карактеристика котрљајних лежаја (критичних компоненти транспортних ваљака) – под дејством контаминирајућих честица са површинских копова угља. Научне хипотезе представљене дисертације се односе управо на ову процедуру, односно, напредним статистичким методама (применом софтверских пакета најновије генерације) је позитивно одговорено на питање да ли постоје статистички значајне зависности између посматраних радних карактеристика вештачки контаминираних котрљајних лежаја – вибрација, температура и времена рада. Утврђене статистичке корелације су потом имплементиране у постојећу једначину за прорачун радијалног зазора котрљајних лежаја. Према развијеној експерименталној методологији је испитан велики број узорака транспортних ваљака, различитог типа, произведених од различитих произвођача. Након анализе и дискусије добијених резултата, поређењем са искуственим подацима из праксе и резултатима до сада реализованих истраживања у предметној области, развијена методологија је успешно верификована, па се може даље примењивати за процену квалитета транспортних ваљака и њихових котрљајних лежаја. Relevant literature, as well as practical experience, has shown that large percentage of thermal power plant energy losses is caused by overland conveyor systems and their key components – conveyor idlers (rollers). That’s the main reason why this assemblies, with function to transfer the load from the conveyor belt and transported material to the supporting frame, are chosen as an object of research presented in this dissertation. In order to improve reliability and decrease financial and energy losses due to unplanned maintenance, a new conveyor idlers testing procedures were developed (some of existing were improved) – and joined in complex experimental testing methodology. Among developed testing procedures, experimental procedure for conveyor idler’s rolling bearings testing is the most important – because it provides the information about the influence of exploitation contamination particles (from the open pit coal mines) on rolling bearing’s operational characteristics. Scientific hypothesis presented in this dissertation are related primarily to this experimental procedure. It was confirmed that statistically significant correlations between artificially contaminated rolling bearing’s vibrations, temperatures and time in operation could be established. One of generated correlation was afterward implemented in existing equation for rolling.
- Published
- 2017
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