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Belgrade, Serbia

Zivanovic M.M.,EDePro Company | Lazarevic M.P.,University of Belgrade
FME Transactions | Year: 2015

The model of a rigid body and heavy foot joined by the revolute joint in the constant gravitational field is described. The rigid body moves in the vertical plane, whereas the heavy foot lies on the flat, very rough horizontal support. Conditions for the dynamic balance of this system are mathematically expressed by using the ZMP method. It is shown that they determine an area in the phase space in which the state of the system should be in order that its dynamic balance is kept. It is also shown by appropriate simulations of motion of the system in the dynamic balance that these conditions are not sufficient for the system to keep its upright posture, but are in connection with its controllability. It is briefly discussed what are the necessary conditions for this system in dynamic balance to keep its upright posture. © Faculty of Mechanical Engineering, Belgrade.

Davidovic N.,EDePro Company | Milos P.,EDePro Company | Jojic B.,University of Belgrade | Milos M.,University of Belgrade
Tehnicki Vjesnik | Year: 2015

Physical model of spoiler and dome deflector thrust vector control (TVC) system was established considering previous and current research observations. According to logic of physical model an engineering mathematical model is derived. Model algorithm and results were analysed and explained. Finally, model data were confirmed with real motor tests. © 2015, Strojarski Facultet. All rights reserved.

Milos P.,EDePro Company | Davidovic N.,EDePro Company | Jojic B.,University of Belgrade | Milos M.,University of Belgrade | Todic I.,University of Belgrade
Tehnicki Vjesnik | Year: 2015

This study proposes an innovative test stand design to accurately measure rocket motor thrust vector during its operation. Test stand design is clearly presented as well as procedure and mathematical model for its calibration. A method of processing data obtained from the experiments and the results of the jet tab system for thrust vector control are presented in detail. Experiments have shown that the test stand is highly functional and the results obtained have excellent repeatability and matching with the results of the other authors who have used different construction test stands for measurement of the same or a similar mechanism for thrust vector control. © 2015, Strojarski Facultet. All rights reserved.

Davidovic N.,EDePro Company | Milos P.,EDePro Company | Elmahmodi A.,University of Tripoli | Milos M.,University of Belgrade | And 2 more authors.
FME Transactions | Year: 2014

Synthetic gas is nowadays the co-product of procceses such as waste gasification and processing biomass, coal and other potentional fuels. Although its composition depends on previous process, synthetic gas is generally mixture of hydrogen, carbon-monoxide and methane in different ratios. The idea to use gases from waste as a fuel for gas-turbine generator producing electric energy is very attractive but also challenging. In this paper is presented modification of an existing turbo-shaft engine in order to be capable to operate with synthetic gas. Together with problems such as low heating value of the gas, different stochiometric ratio of gas and air compared to kerosene/air combination and high hydrogen contents, the engineering task was to do it with minimum number of changes. Problem is solved by adjusting existing airblast atomizers and experimentally verified. © Faculty of Mechanical Engineering, Belgrade.

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