TY  - CONF
AU  - Kolarević, Nenad
AU  - Micković, D.
AU  - Crnojević, Stevan
AU  - Stanković, Miloš
AU  - Ognjanović, Milosav
AU  - Miloš, Marko
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2979
AB  - The dynamic behavior of machines which rotate at extreme high speeds is crucial for stable and long operation. In design process some dynamics calculation must be taken into account to avoid potential operation near resonance areas. This paper considers dynamic analysis of the high speed reducer, designed together with the turbo-shaft engine. Resonances can occur when frequency of rotation and teeth mesh frequency are close to gear pair in mesh natural frequency, to the shafts natural frequencies and to the other parts natural frequencies. Problems can be avoided by translating resonant areas to higher or lower level of frequency by changing some design parameters, mass, stiffness and by variation of the stiffness of bearing supports. The paper presents the approaches to natural frequencies identification for the example of high speed reducer design. Some examples of design solutions, especially for elastic bearing supports and their experimental testing are also presented.
PB  - Institute of Physics Publishing
C3  - IOP Conference Series: Materials Science and Engineering
T1  - Dynamic stability of high speed turboshaft engine with reducer
IS  - 1
VL  - 393
DO  - 10.1088/1757-899X/393/1/012070
ER  - 

@conference{
author = "Kolarević, Nenad and Micković, D. and Crnojević, Stevan and Stanković, Miloš and Ognjanović, Milosav and Miloš, Marko",
year = "2018",
abstract = "The dynamic behavior of machines which rotate at extreme high speeds is crucial for stable and long operation. In design process some dynamics calculation must be taken into account to avoid potential operation near resonance areas. This paper considers dynamic analysis of the high speed reducer, designed together with the turbo-shaft engine. Resonances can occur when frequency of rotation and teeth mesh frequency are close to gear pair in mesh natural frequency, to the shafts natural frequencies and to the other parts natural frequencies. Problems can be avoided by translating resonant areas to higher or lower level of frequency by changing some design parameters, mass, stiffness and by variation of the stiffness of bearing supports. The paper presents the approaches to natural frequencies identification for the example of high speed reducer design. Some examples of design solutions, especially for elastic bearing supports and their experimental testing are also presented.",
publisher = "Institute of Physics Publishing",
journal = "IOP Conference Series: Materials Science and Engineering",
title = "Dynamic stability of high speed turboshaft engine with reducer",
number = "1",
volume = "393",
doi = "10.1088/1757-899X/393/1/012070"
}

Kolarević, N., Micković, D., Crnojević, S., Stanković, M., Ognjanović, M.,& Miloš, M.. (2018). Dynamic stability of high speed turboshaft engine with reducer. in IOP Conference Series: Materials Science and Engineering
Institute of Physics Publishing., 393(1).
https://doi.org/10.1088/1757-899X/393/1/012070

Kolarević N, Micković D, Crnojević S, Stanković M, Ognjanović M, Miloš M. Dynamic stability of high speed turboshaft engine with reducer. in IOP Conference Series: Materials Science and Engineering. 2018;393(1).
doi:10.1088/1757-899X/393/1/012070 .

Kolarević, Nenad, Micković, D., Crnojević, Stevan, Stanković, Miloš, Ognjanović, Milosav, Miloš, Marko, "Dynamic stability of high speed turboshaft engine with reducer" in IOP Conference Series: Materials Science and Engineering, 393, no. 1 (2018),
https://doi.org/10.1088/1757-899X/393/1/012070 . .

TY  - CONF
AU  - Kolarević, Nenad
AU  - Stanković, Miloš
AU  - Crnojević, Stevan
AU  - Micković, D.
AU  - Miloš, Marko
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2953
PB  - DANUBIA Adria Symposium on Advances in Experimental Mechanics
C3  - 35th Danubia Adria Symposium on Advances in Experimental Mechanics
T1  - Measuring the axial force on turbo-jet engine rotor
EP  - 42
SP  - 41
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2953
ER  - 

@conference{
author = "Kolarević, Nenad and Stanković, Miloš and Crnojević, Stevan and Micković, D. and Miloš, Marko",
year = "2018",
publisher = "DANUBIA Adria Symposium on Advances in Experimental Mechanics",
journal = "35th Danubia Adria Symposium on Advances in Experimental Mechanics",
title = "Measuring the axial force on turbo-jet engine rotor",
pages = "42-41",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2953"
}

Kolarević, N., Stanković, M., Crnojević, S., Micković, D.,& Miloš, M.. (2018). Measuring the axial force on turbo-jet engine rotor. in 35th Danubia Adria Symposium on Advances in Experimental Mechanics
DANUBIA Adria Symposium on Advances in Experimental Mechanics., 41-42.
https://hdl.handle.net/21.15107/rcub_machinery_2953

Kolarević N, Stanković M, Crnojević S, Micković D, Miloš M. Measuring the axial force on turbo-jet engine rotor. in 35th Danubia Adria Symposium on Advances in Experimental Mechanics. 2018;:41-42.
https://hdl.handle.net/21.15107/rcub_machinery_2953 .

Kolarević, Nenad, Stanković, Miloš, Crnojević, Stevan, Micković, D., Miloš, Marko, "Measuring the axial force on turbo-jet engine rotor" in 35th Danubia Adria Symposium on Advances in Experimental Mechanics (2018):41-42,
https://hdl.handle.net/21.15107/rcub_machinery_2953 .

TY  - JOUR
AU  - Bjelovuk, I.
AU  - Jaramaz, Slobodan
AU  - Elek, Predrag
AU  - Micković, D.
AU  - Kricak, Lazar
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2199
AB  - The paper presents empirical and numerical models of characteristics of a crater emerged from a surface explosion of a small TNT charge on the soil. The proposed models can be useful for estimation of the explosive mass based on the crater characteristics. The models show satisfactory fitting with the experimental results and confirm the hypothesis that the crater characteristics depend on the explosive mass and contact area between the charge and the soil surface. Two equations for estimation of the explosive mass based on the crater volume are proposed.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Combustion Explosion and Shock Waves
T1  - Modelling of Characteristics of a Crater Emerged from a Surface Explosion on the Soil
EP  - 400
IS  - 3
SP  - 395
VL  - 51
DO  - 10.1134/S001050821503017X
ER  - 

@article{
author = "Bjelovuk, I. and Jaramaz, Slobodan and Elek, Predrag and Micković, D. and Kricak, Lazar",
year = "2015",
abstract = "The paper presents empirical and numerical models of characteristics of a crater emerged from a surface explosion of a small TNT charge on the soil. The proposed models can be useful for estimation of the explosive mass based on the crater characteristics. The models show satisfactory fitting with the experimental results and confirm the hypothesis that the crater characteristics depend on the explosive mass and contact area between the charge and the soil surface. Two equations for estimation of the explosive mass based on the crater volume are proposed.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Combustion Explosion and Shock Waves",
title = "Modelling of Characteristics of a Crater Emerged from a Surface Explosion on the Soil",
pages = "400-395",
number = "3",
volume = "51",
doi = "10.1134/S001050821503017X"
}

Bjelovuk, I., Jaramaz, S., Elek, P., Micković, D.,& Kricak, L.. (2015). Modelling of Characteristics of a Crater Emerged from a Surface Explosion on the Soil. in Combustion Explosion and Shock Waves
Maik Nauka/Interperiodica/Springer, New York., 51(3), 395-400.
https://doi.org/10.1134/S001050821503017X

Bjelovuk I, Jaramaz S, Elek P, Micković D, Kricak L. Modelling of Characteristics of a Crater Emerged from a Surface Explosion on the Soil. in Combustion Explosion and Shock Waves. 2015;51(3):395-400.
doi:10.1134/S001050821503017X .

Bjelovuk, I., Jaramaz, Slobodan, Elek, Predrag, Micković, D., Kricak, Lazar, "Modelling of Characteristics of a Crater Emerged from a Surface Explosion on the Soil" in Combustion Explosion and Shock Waves, 51, no. 3 (2015):395-400,
https://doi.org/10.1134/S001050821503017X . .

TY  - CONF
AU  - Jaramaz, Slobodan
AU  - Micković, D.
AU  - Elek, Predrag
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1750
AB  - Study of interaction of explosive reactive armor (ERA) with shaped charge jet is the basis for evaluation of ERA effectiveness. Theoretical model of this interaction is given. It is incorporated in the ERASC computer code. Experimental investigations comprise influence of upper and down plate thickness, jet attack angle, distance between ERA and main armor, etc. Computational results of ERASC code are compared with experimental data. Very good agreement between computational and experimental results of penetration in the steel target is observed. The developed code enables optimisation of explosive reactive armor.
PB  - DEStech Publications Inc.
C3  - Proceedings - 27th International Symposium on Ballistics, BALLISTICS 2013
T1  - Explosive reactive armor: theoretical and experimental studies
EP  - 1505
SP  - 1495
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1750
ER  - 

@conference{
author = "Jaramaz, Slobodan and Micković, D. and Elek, Predrag",
year = "2013",
abstract = "Study of interaction of explosive reactive armor (ERA) with shaped charge jet is the basis for evaluation of ERA effectiveness. Theoretical model of this interaction is given. It is incorporated in the ERASC computer code. Experimental investigations comprise influence of upper and down plate thickness, jet attack angle, distance between ERA and main armor, etc. Computational results of ERASC code are compared with experimental data. Very good agreement between computational and experimental results of penetration in the steel target is observed. The developed code enables optimisation of explosive reactive armor.",
publisher = "DEStech Publications Inc.",
journal = "Proceedings - 27th International Symposium on Ballistics, BALLISTICS 2013",
title = "Explosive reactive armor: theoretical and experimental studies",
pages = "1505-1495",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1750"
}

Jaramaz, S., Micković, D.,& Elek, P.. (2013). Explosive reactive armor: theoretical and experimental studies. in Proceedings - 27th International Symposium on Ballistics, BALLISTICS 2013
DEStech Publications Inc.., 2, 1495-1505.
https://hdl.handle.net/21.15107/rcub_machinery_1750

Jaramaz S, Micković D, Elek P. Explosive reactive armor: theoretical and experimental studies. in Proceedings - 27th International Symposium on Ballistics, BALLISTICS 2013. 2013;2:1495-1505.
https://hdl.handle.net/21.15107/rcub_machinery_1750 .

Jaramaz, Slobodan, Micković, D., Elek, Predrag, "Explosive reactive armor: theoretical and experimental studies" in Proceedings - 27th International Symposium on Ballistics, BALLISTICS 2013, 2 (2013):1495-1505,
https://hdl.handle.net/21.15107/rcub_machinery_1750 .

TY  - CONF
AU  - Micković, D.
AU  - Jaramaz, Slobodan
AU  - Elek, Predrag
AU  - Jaramaz, D.
AU  - Micković, D. D.
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1688
AB  - For lumped parameter models it was especially important to determine the pressure on the projectile base, pressure on the chamber base and pressure for the propellant burning law. In the paper two analytical methods and one numerical method are considered. The analytical methods of proportionate expansion and two-phase mixture are studied. Pressure profiles are also computed numerically by TWOPIB code, which is based on the model of two-phase flow of solid propellant and its products of combustion, treated as separate phases with appropriate conservation laws and interactions between phases. Through comparison with experimental results on the real weapon system TWOPIB code showed great advantages over analytical methods.
PB  - Destech Publications, Inc, Lancaster
C3  - 27th International Symposium on Ballistics, Vols. 1 and 2
T1  - Determination of pressure profiles behind projectiles during interior ballistic cycle
EP  - 77
SP  - 74
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1688
ER  - 

@conference{
author = "Micković, D. and Jaramaz, Slobodan and Elek, Predrag and Jaramaz, D. and Micković, D. D.",
year = "2013",
abstract = "For lumped parameter models it was especially important to determine the pressure on the projectile base, pressure on the chamber base and pressure for the propellant burning law. In the paper two analytical methods and one numerical method are considered. The analytical methods of proportionate expansion and two-phase mixture are studied. Pressure profiles are also computed numerically by TWOPIB code, which is based on the model of two-phase flow of solid propellant and its products of combustion, treated as separate phases with appropriate conservation laws and interactions between phases. Through comparison with experimental results on the real weapon system TWOPIB code showed great advantages over analytical methods.",
publisher = "Destech Publications, Inc, Lancaster",
journal = "27th International Symposium on Ballistics, Vols. 1 and 2",
title = "Determination of pressure profiles behind projectiles during interior ballistic cycle",
pages = "77-74",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1688"
}

Micković, D., Jaramaz, S., Elek, P., Jaramaz, D.,& Micković, D. D.. (2013). Determination of pressure profiles behind projectiles during interior ballistic cycle. in 27th International Symposium on Ballistics, Vols. 1 and 2
Destech Publications, Inc, Lancaster., 74-77.
https://hdl.handle.net/21.15107/rcub_machinery_1688

Micković D, Jaramaz S, Elek P, Jaramaz D, Micković DD. Determination of pressure profiles behind projectiles during interior ballistic cycle. in 27th International Symposium on Ballistics, Vols. 1 and 2. 2013;:74-77.
https://hdl.handle.net/21.15107/rcub_machinery_1688 .

Micković, D., Jaramaz, Slobodan, Elek, Predrag, Jaramaz, D., Micković, D. D., "Determination of pressure profiles behind projectiles during interior ballistic cycle" in 27th International Symposium on Ballistics, Vols. 1 and 2 (2013):74-77,
https://hdl.handle.net/21.15107/rcub_machinery_1688 .

TY  - JOUR
AU  - Bjelovuk, I.
AU  - Jaramaz, Slobodan
AU  - Elek, Predrag
AU  - Micković, D.
AU  - Kricak, Lazar
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1767
AB  - In the course of court trials and for the purpose of legal proceedings, forensic engineers often produce estimations of the explosive mass based on the explosion effect. For the preliminary estimation of the explosive mass one often uses empiric formulas. This paper describes experimental surface explosions of variable mass of known explosive charge on the asphalt with the objective to make correlations between causes and consequences of an explosion. Dimensions of the resulting craters were measured and an overview of experimental tests of five equations for calculating the mass of explosive based on the dimensions of the craters is given. The asphalt surfaces were chosen since the highest number of explosions, which are the results of terrorist or some other criminal acts, occur in urban conditions where asphalt is the dominant surface. Based on the given overview it is possible to give an evaluation of equation's reliability for certain explosive masses. The paper also includes a brief review of the facts related to the position of initiation and its influence the shape and dimensions of the crater.
PB  - Croation Union of Mech. Engineers and Naval Architects
T2  - Strojarstvo
T1  - Preliminary estimation of the explosive mass based on the crater resulting from the surface explosion on asphalt
EP  - 210
IS  - 3
SP  - 203
VL  - 55
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1767
ER  - 

@article{
author = "Bjelovuk, I. and Jaramaz, Slobodan and Elek, Predrag and Micković, D. and Kricak, Lazar",
year = "2013",
abstract = "In the course of court trials and for the purpose of legal proceedings, forensic engineers often produce estimations of the explosive mass based on the explosion effect. For the preliminary estimation of the explosive mass one often uses empiric formulas. This paper describes experimental surface explosions of variable mass of known explosive charge on the asphalt with the objective to make correlations between causes and consequences of an explosion. Dimensions of the resulting craters were measured and an overview of experimental tests of five equations for calculating the mass of explosive based on the dimensions of the craters is given. The asphalt surfaces were chosen since the highest number of explosions, which are the results of terrorist or some other criminal acts, occur in urban conditions where asphalt is the dominant surface. Based on the given overview it is possible to give an evaluation of equation's reliability for certain explosive masses. The paper also includes a brief review of the facts related to the position of initiation and its influence the shape and dimensions of the crater.",
publisher = "Croation Union of Mech. Engineers and Naval Architects",
journal = "Strojarstvo",
title = "Preliminary estimation of the explosive mass based on the crater resulting from the surface explosion on asphalt",
pages = "210-203",
number = "3",
volume = "55",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1767"
}

Bjelovuk, I., Jaramaz, S., Elek, P., Micković, D.,& Kricak, L.. (2013). Preliminary estimation of the explosive mass based on the crater resulting from the surface explosion on asphalt. in Strojarstvo
Croation Union of Mech. Engineers and Naval Architects., 55(3), 203-210.
https://hdl.handle.net/21.15107/rcub_machinery_1767

Bjelovuk I, Jaramaz S, Elek P, Micković D, Kricak L. Preliminary estimation of the explosive mass based on the crater resulting from the surface explosion on asphalt. in Strojarstvo. 2013;55(3):203-210.
https://hdl.handle.net/21.15107/rcub_machinery_1767 .

Bjelovuk, I., Jaramaz, Slobodan, Elek, Predrag, Micković, D., Kricak, Lazar, "Preliminary estimation of the explosive mass based on the crater resulting from the surface explosion on asphalt" in Strojarstvo, 55, no. 3 (2013):203-210,
https://hdl.handle.net/21.15107/rcub_machinery_1767 .

TY  - CONF
AU  - Micković, D.
AU  - Jaramaz, Slobodan
AU  - Elek, Predrag
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1547
PB  - University of Belgrade
C3  - 29th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2012
T1  - Experimental characterisation of two-phase reactive flows in propellant chamber
EP  - 221
SP  - 218
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1547
ER  - 

@conference{
author = "Micković, D. and Jaramaz, Slobodan and Elek, Predrag",
year = "2012",
publisher = "University of Belgrade",
journal = "29th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2012",
title = "Experimental characterisation of two-phase reactive flows in propellant chamber",
pages = "221-218",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1547"
}

Micković, D., Jaramaz, S.,& Elek, P.. (2012). Experimental characterisation of two-phase reactive flows in propellant chamber. in 29th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2012
University of Belgrade., 218-221.
https://hdl.handle.net/21.15107/rcub_machinery_1547

Micković D, Jaramaz S, Elek P. Experimental characterisation of two-phase reactive flows in propellant chamber. in 29th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2012. 2012;:218-221.
https://hdl.handle.net/21.15107/rcub_machinery_1547 .

Micković, D., Jaramaz, Slobodan, Elek, Predrag, "Experimental characterisation of two-phase reactive flows in propellant chamber" in 29th DANUBlA-ADRIA Symposium on Advances in Experimental Mechanics, DAS 2012 (2012):218-221,
https://hdl.handle.net/21.15107/rcub_machinery_1547 .

TY  - JOUR
AU  - Elek, Predrag
AU  - Jaramaz, Slobodan
AU  - Micković, D
PY  - 2005
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/488
AB  - The perforation of monolithic and multi-layered thin metallic plates by flat-ended cylindrical penctrator is considered. The most relevant analytical penetration models with their most important assumptions, basic process mechanisms, and key analytical relations for plugging mode of monolithic plates penetration are reviewed. Comparative analysis of computational results and our experimental data show significant compatibility of process basic parameters and also indicates certain limitations of the analytical models. It has been concluded that phenomenological model with deformable penetrator represents the best analytical approximation of penetration process. By modification of this model, the improved penetration model is creawed, whose results better correspond with experimental data. The improved model is applied to the analysis of perforation of multi-layered targets with spaced layers. Theoretical results for the case of double-layer target are especially analyzed. These results enable the formulation of certain conclusions of considerable practical importance.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Solids and Structures
T1  - Modeling of perforation of plates and multi-layered metallic targets
EP  - 1224
IS  - 3-4
SP  - 1209
VL  - 42
DO  - 10.1016/j.ijsolstr.2004.06.053
ER  - 

@article{
author = "Elek, Predrag and Jaramaz, Slobodan and Micković, D",
year = "2005",
abstract = "The perforation of monolithic and multi-layered thin metallic plates by flat-ended cylindrical penctrator is considered. The most relevant analytical penetration models with their most important assumptions, basic process mechanisms, and key analytical relations for plugging mode of monolithic plates penetration are reviewed. Comparative analysis of computational results and our experimental data show significant compatibility of process basic parameters and also indicates certain limitations of the analytical models. It has been concluded that phenomenological model with deformable penetrator represents the best analytical approximation of penetration process. By modification of this model, the improved penetration model is creawed, whose results better correspond with experimental data. The improved model is applied to the analysis of perforation of multi-layered targets with spaced layers. Theoretical results for the case of double-layer target are especially analyzed. These results enable the formulation of certain conclusions of considerable practical importance.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Solids and Structures",
title = "Modeling of perforation of plates and multi-layered metallic targets",
pages = "1224-1209",
number = "3-4",
volume = "42",
doi = "10.1016/j.ijsolstr.2004.06.053"
}

Elek, P., Jaramaz, S.,& Micković, D.. (2005). Modeling of perforation of plates and multi-layered metallic targets. in International Journal of Solids and Structures
Pergamon-Elsevier Science Ltd, Oxford., 42(3-4), 1209-1224.
https://doi.org/10.1016/j.ijsolstr.2004.06.053

Elek P, Jaramaz S, Micković D. Modeling of perforation of plates and multi-layered metallic targets. in International Journal of Solids and Structures. 2005;42(3-4):1209-1224.
doi:10.1016/j.ijsolstr.2004.06.053 .

Elek, Predrag, Jaramaz, Slobodan, Micković, D, "Modeling of perforation of plates and multi-layered metallic targets" in International Journal of Solids and Structures, 42, no. 3-4 (2005):1209-1224,
https://doi.org/10.1016/j.ijsolstr.2004.06.053 . .