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Novi Beograd, Serbia

Popovic Z.,University of Belgrade | Radovic V.,University of Montenegro | Lazarevic L.,University of Belgrade | Vukadinovic V.,Serbian Railways | Tepic G.,University of Novi Sad
Metalurgija | Year: 2013

Rail defects due to rolling contact fatigue (RCF) threaten the traffic safety around the world. That hazard is more distinct on railways without adequate maintenance strategy. Realization of interoperability of European railway network demands from every infrastructure manager to have a maintenance plan for the infrastructure subsystem. Besides that, this plan includes rail inspection and strategy against RCF defects. This paper emphasizes the importance of rail inspection and early detection of RCF because the most of RCF crack should be removed in rail grinding campaigns (preventive, cyclical and corrective activities) during the whole rail service life.


Tepic G.,University of Novi Sad | Pejakov T.,University of Novi Sad | Lalic B.,University of Novi Sad | Vukadinovic V.,Serbian Railways | Milisavljevic S.,University of Novi Sad
Metalurgija | Year: 2013

Environmental protection is a serious problem facing the modern world. Precisely for this reason, in this work, the authors explore its different aspects. From the perspective of conservation of natural resources and energy savings, the replacement of primary materials through recycling is explored as a potential solution in the elementary processes related to the parasol production. Such parasols would be used in designing "urban forest" solutions, which significantly contribute to the protection of the planet from global warming, as well as the preservation of life and survival.


Tanackov I.,University of Novi Sad | Tepic J.,University of Novi Sad | Kostelac M.,University of Zagreb | Stojic G.,University of Novi Sad | Masal Z.,Serbian Railways
WIT Transactions on the Built Environment | Year: 2012

The paper presents a new approach to the research into the aerodynamic characteristics of vehicles and their interpretation. The approach is based on the theory of collision. The virtual mass is related to the unit coefficient of restitution of a central collision and to the absorption of kinetic energy. The basic system is chosen to be a train, and the system involving the virtual mass effect is air. A series of successive collisions of these two systems provides a model of air resistance. The expression derived for the unit virtual mass states that it is equal to a half of the coefficient of the square polynomial term of the air drag function. Thus, a physical interpretation of the virtual mass has been obtained and the metric system of the air resistance has been determined. A relation between the virtual mass and the most important aerodynamic characteristic, i.e. the coefficient of aerodynamic profile, has been established. © 2012 WIT Press.


Ranitovic P.,University of Belgrade | Tepic G.,University of Novi Sad | Matic B.,University of Novi Sad | Sremac S.,University of Novi Sad | Vukadinovic V.,Serbian Railways
Metalurgija | Year: 2013

MySAP ERP - Enterprise Resource Planning (system - solution which provides a whole set of functions for the business analytics, finance, human resources management, logistics and corporate services) has developed from SAP R/3. It is one of the main products of the SAP AG German multinational company and as such, it is a very important element of the international industrial and technological security system. By defining the functional dependency between the security systems (logistics security systems) and the IT (My SAP ERP) systems in metallurgy, a concept for designing MY SAP ERP system in metallurgic industry is defined, based on the security aspects.


Milenkovic D.,Serbian Railways | Adamovic Z.,Technical Faculty | Krstic M.,Serbian Railways | Milutnovic D.,Serbian Railways
Journal of the Balkan Tribological Association | Year: 2013

The paper shows the functioning of rail fastening system on a railway track. The function of rail fastening system is to maintain the required tightening force as long as possible, as well as the required pull-out force of coach screws, which results in strong connections between other elements of rail fasteners and sleepers. Based on the tests conducted in laboratories and in field on pull-out force with a built-in plastic dowel and binder (Sikadur-31), on concrete as well as wooden sleepers, the following can be concluded: the results show that with the increase in friction, the pull-out force goes up significantly when the injected binder has the addition of quartz sand, as well as the increase in reliability of a joint between rails and sleepers with other fastening elements. Unreliable rail and sleeper joint leads to increased wear of other elements in the connection and thus reduces the flexibility and reliability of rail fastening system.

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