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Minic D.M.,Military Technical Institute Belgrade | Maricic A.,University of Kragujevac
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2010

The influence of heating on the electrical and magnetic properties of Fe75Ni2B13Si8C2 amorphous alloy is studied under non-isothermal as well as under isothermal conditions. According to thermal analysis the amorphous alloy was stable up to a temperature of about 500 °C when the process of multi-step structural transformations begins. According to the X-ray diffraction analysis, the primary crystallization starts by forming iron-silicon (Fe3Si, 70 wt%) as main phase and two minor phases, iron-boron (Fe2B, 10 wt%) and iron-boron-silicon (Fe15B2Si3, 20 wt%). With the increase of the temperature, the change of weight composition, as well as the ratio of present phases occurs, and at 650 °C it was confirmed the presence of only two stable phases, Fe3Si (74 wt%) and Fe2B (26 wt%). It was shown that the observed change of structure had significant influence on both the electric and magnetic properties of alloy. The electric resistivity in crystallized alloy is higher than the amorphous one, but the crystallized alloy possesses better magnetic susceptibility and retains the ferromagnetic properties in the whole investigated temperature range. © 2010 Elsevier B.V. Source


Zivanovic Z.,Vinca Institute of Nuclear Sciences | Milic M.,Military Technical Institute Belgrade
Strojniski Vestnik/Journal of Mechanical Engineering | Year: 2012

The paper presents the results of thermal load investigations of multidisc friction assemblies used as service brakes of a high speed tracked vehicle. By simulating the corresponding braking regimes and measuring the characteristic quantities on an inertial test stand, the relevant parameters of the braking process have been determined. The obtained results have been analyzed and compared to the permitted values of thermal load of the material of the tested friction discs. After a certain number of braking cycles by visual inspection of the brakes the state of the friction elements have been determined. The speed limits for braking the vehicle at higher transmission gear ratios, which may result in a permanent damage of the brakes, have been determined. © 2011 Journal of Mechanical Engineering. All rights reserved. Source


Pasagic S.,Ministry of Defense | Antonovic D.,University of Belgrade | Brzic S.,Military Technical Institute Belgrade
Central European Journal of Energetic Materials | Year: 2015

The specific purpose of a pyrotechnic mixture for a Gas Generator (GG) of Base Bleed (BB) projectile requires a carefully balanced combustion velocity for obtaining the maximum projectile range and avoiding a reactive propelling force. The development of the pyrotechnic element is done under laboratory conditions which often differ from the real usage conditions. To be able to fairly predict the combustion process characteristics in the real GGs of BB projectiles, some influential technological factors and their influence on the combustion velocity have been investigated. Factors which were observed to have the most significant influence on the combustion velocity of pyrotechnic compositions are charge density, oxygen balance, combustion chamber wall thickness and material type. Individual and combined influence of these factors on the combustion velocity will also be presented in this paper. Source


Zivkovic S.,Military Technical Institute Belgrade
FME Transactions | Year: 2016

Replacing or upgrading software packages requires a detailed analysis and testing.This is especially important for software modules that are part of the production process. Machining of free-form surfaces always requires using of a five-axis milling machine. Tool path post-processing for these machines allways attracts special attention. The most important part of the postprocessor is implemented IKS (Inverse Kinematic Solver). Implemented IKS in the postprocessor must accurately describe the kinematics of milling machine in the production plant. Military Technical Institute performed parallel testing of two postprocessing modules of CAD/CAM system Siemens PLM NX: and old GPM (Graphics Postprocessor Module and a new module MOM (Manufacturing Output Manager). Complete analysis was sent to the NX support center and application engineers confirmed that the old and new postprocessors do not behave identically. The paper describes in detail the analysis and explains the solution of the presented problem. © Faculty of Mechanical Engineering, Belgrade. Source


Song T.L.,Hanyang University | Musicki D.,Hanyang University | Kim D.S.,LIG Nexl Co. | Radosavljevic Z.,Military Technical Institute Belgrade
IET Radar, Sonar and Navigation | Year: 2012

Multi-target tracking in clutter, assuming linear target trajectory propagation and linear target measurement equation, naturally leads to a Gaussian mixture (GM) target tracking solution. This study examines and compares two prominent methods that use the GMs: the probability hypothesis density and the integrated track splitting. Both are recursive Bayes methods and both incorporate the false track discrimination capabilities. They are represented in the form of GM target density filters. The modelling assumptions are translated in the algorithmic requirements. The authors compare the algorithms on the basis of these requirements with the future work indicated to reconcile algorithms and requirements. © 2012 The Institution of Engineering and Technology. Source

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