TY  - JOUR
AU  - Marković, Zoran
AU  - Krivošić, Ilija M.
AU  - Stefanović, Predrag
AU  - Cvetinović, Dejan
AU  - Živković, Nikola V.
AU  - Jovanović, Rastko
AU  - Pavlović, Zoran
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12118
AB  - Cilindrične tankozidne ljuske se često koriste kao strukturalni elementi u inženjerskim konstrukcijama. Aksijalno pritisnute cilindrične strukture su sklone pojavi gubitka stabilnosti, pri čemu im značajno opada nosivost i naglo menja geometrija strukture. Stoga je veoma bitno odrediti vrednosti spoljašnjeg opterećenja pri kojem dolazi do pojave gubitka stabilnosti. U opštem slučaju, analiza gubitka stabilnosti se može podeliti na bifurkacionu i nelinearnu analizu. Bifurkaciona analiza se koristi za razmatranje geometrijski idealnih, a nelinearna za analizu realnih struktura. Cilj ovog rada je da se odrede najniže vrednosti spoljašnjeg opterećenja pri kojem će doći do gubitka stabilnosti geometrijski idealnih, aksijalno pritisnutih, slobodno oslonjenih cilindara različitih geometrijskih karakteristika. U tu svrhu je korišćena numerička analiza zasnovana na metodi konačnih elemenata. Na osnovu rezultata parametarske numeričke analize, možemo zaključiti da nosivost aksijalno pritisnutog, geometrijski idealnog cilindra značajno opada sa porastom faktora debljine cilindra R/t. Takođe, rezultati pokazuju da dolazi i do pada krutosti sa porastom faktora vitkosti L/R, ali da uticaj faktora vitkosti na vrednost opterećenja pri pojavi izvijanja nije tako intenzivan.
AB  - Cylindrical shells with thin walls are widely used structural elements in engineering constructions. Axially compressed shells are susceptible to buckling, which significantly reduce their load carrying capabilities. In the same time, buckling induces sudden and remarkable changes of shell geometry, so reliable determination of shell buckling load becomes a very important task for the structural engineers. Generally, buckling analysis may be divided into bifurcation and load-deflection analysis. Bifurcation analysis is used for geometrically perfect, while load-deflection analysis is used for imperfect systems. The aim of this paper is to investigate the buckling strength of the geometrically perfect, axially compressed, simply supported cylindrical shell with a wide range of height-to-diameter and diameter-to-thickness ratios. Numerical analysis based on finite elements method is used to evaluate buckling strength. According to the results of the parametric study, the buckling strength of the axially compressed perfect shell decreases significantly as the diameter to-thickness ratio increases, while it decreases slightly as the height-to-diameter ratio increases.
T2  - Termotehnika
T1  - Parametarska bifurkaciona analiza slobodno oslonjenih cilindričnih ljuski
T1  - Parametric buckling analysis of simply supported cylindrical shell
VL  - 37
IS  - 2
SP  - 241
EP  - 251
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12118
ER  - 

@article{
author = "Marković, Zoran and Krivošić, Ilija M. and Stefanović, Predrag and Cvetinović, Dejan and Živković, Nikola V. and Jovanović, Rastko and Pavlović, Zoran",
year = "2010",
abstract = "Cilindrične tankozidne ljuske se često koriste kao strukturalni elementi u inženjerskim konstrukcijama. Aksijalno pritisnute cilindrične strukture su sklone pojavi gubitka stabilnosti, pri čemu im značajno opada nosivost i naglo menja geometrija strukture. Stoga je veoma bitno odrediti vrednosti spoljašnjeg opterećenja pri kojem dolazi do pojave gubitka stabilnosti. U opštem slučaju, analiza gubitka stabilnosti se može podeliti na bifurkacionu i nelinearnu analizu. Bifurkaciona analiza se koristi za razmatranje geometrijski idealnih, a nelinearna za analizu realnih struktura. Cilj ovog rada je da se odrede najniže vrednosti spoljašnjeg opterećenja pri kojem će doći do gubitka stabilnosti geometrijski idealnih, aksijalno pritisnutih, slobodno oslonjenih cilindara različitih geometrijskih karakteristika. U tu svrhu je korišćena numerička analiza zasnovana na metodi konačnih elemenata. Na osnovu rezultata parametarske numeričke analize, možemo zaključiti da nosivost aksijalno pritisnutog, geometrijski idealnog cilindra značajno opada sa porastom faktora debljine cilindra R/t. Takođe, rezultati pokazuju da dolazi i do pada krutosti sa porastom faktora vitkosti L/R, ali da uticaj faktora vitkosti na vrednost opterećenja pri pojavi izvijanja nije tako intenzivan., Cylindrical shells with thin walls are widely used structural elements in engineering constructions. Axially compressed shells are susceptible to buckling, which significantly reduce their load carrying capabilities. In the same time, buckling induces sudden and remarkable changes of shell geometry, so reliable determination of shell buckling load becomes a very important task for the structural engineers. Generally, buckling analysis may be divided into bifurcation and load-deflection analysis. Bifurcation analysis is used for geometrically perfect, while load-deflection analysis is used for imperfect systems. The aim of this paper is to investigate the buckling strength of the geometrically perfect, axially compressed, simply supported cylindrical shell with a wide range of height-to-diameter and diameter-to-thickness ratios. Numerical analysis based on finite elements method is used to evaluate buckling strength. According to the results of the parametric study, the buckling strength of the axially compressed perfect shell decreases significantly as the diameter to-thickness ratio increases, while it decreases slightly as the height-to-diameter ratio increases.",
journal = "Termotehnika",
title = "Parametarska bifurkaciona analiza slobodno oslonjenih cilindričnih ljuski, Parametric buckling analysis of simply supported cylindrical shell",
volume = "37",
number = "2",
pages = "241-251",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12118"
}

Marković, Z., Krivošić, I. M., Stefanović, P., Cvetinović, D., Živković, N. V., Jovanović, R.,& Pavlović, Z.. (2010). Parametarska bifurkaciona analiza slobodno oslonjenih cilindričnih ljuski. in Termotehnika, 37(2), 241-251.
https://hdl.handle.net/21.15107/rcub_vinar_12118

Marković Z, Krivošić IM, Stefanović P, Cvetinović D, Živković NV, Jovanović R, Pavlović Z. Parametarska bifurkaciona analiza slobodno oslonjenih cilindričnih ljuski. in Termotehnika. 2010;37(2):241-251.
https://hdl.handle.net/21.15107/rcub_vinar_12118 .

Marković, Zoran, Krivošić, Ilija M., Stefanović, Predrag, Cvetinović, Dejan, Živković, Nikola V., Jovanović, Rastko, Pavlović, Zoran, "Parametarska bifurkaciona analiza slobodno oslonjenih cilindričnih ljuski" in Termotehnika, 37, no. 2 (2010):241-251,
https://hdl.handle.net/21.15107/rcub_vinar_12118 .

TY  - CONF
AU  - Jovanović, Rastko D.
AU  - Swiatkowski, Bartosz
AU  - Cvetinović, Dejan
AU  - Stefanović, Predrag Lj.
AU  - Marković, Zoran J.
AU  - Pavlović, Zoran
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6703
AB  - The subject of this work is turbulent two-phase flow through air-coal channel(s) of complex geometry. The aim of this work is numerical optimization of fluid flow and coal particles distribution. A few proposed variants of the single blade turbulator, which has a role to increase turbulence in vertical section of air-coal mixture channel, were numerically investigated. More uniform coal particle distribution was achieved using single blade turbulators.
C3  - AIP Conference Proceedings
T1  - Turbulent two-phase flow modeling of air-coal mixture channels with single blade turbulators
VL  - 936
IS  - 1
SP  - 300
EP  - 303
DO  - 10.1063/1.2790135
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6703
ER  - 

@conference{
author = "Jovanović, Rastko D. and Swiatkowski, Bartosz and Cvetinović, Dejan and Stefanović, Predrag Lj. and Marković, Zoran J. and Pavlović, Zoran",
year = "2007",
abstract = "The subject of this work is turbulent two-phase flow through air-coal channel(s) of complex geometry. The aim of this work is numerical optimization of fluid flow and coal particles distribution. A few proposed variants of the single blade turbulator, which has a role to increase turbulence in vertical section of air-coal mixture channel, were numerically investigated. More uniform coal particle distribution was achieved using single blade turbulators.",
journal = "AIP Conference Proceedings",
title = "Turbulent two-phase flow modeling of air-coal mixture channels with single blade turbulators",
volume = "936",
number = "1",
pages = "300-303",
doi = "10.1063/1.2790135",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6703"
}

Jovanović, R. D., Swiatkowski, B., Cvetinović, D., Stefanović, P. Lj., Marković, Z. J.,& Pavlović, Z.. (2007). Turbulent two-phase flow modeling of air-coal mixture channels with single blade turbulators. in AIP Conference Proceedings, 936(1), 300-303.
https://doi.org/10.1063/1.2790135
https://hdl.handle.net/21.15107/rcub_vinar_6703

Jovanović RD, Swiatkowski B, Cvetinović D, Stefanović PL, Marković ZJ, Pavlović Z. Turbulent two-phase flow modeling of air-coal mixture channels with single blade turbulators. in AIP Conference Proceedings. 2007;936(1):300-303.
doi:10.1063/1.2790135
https://hdl.handle.net/21.15107/rcub_vinar_6703 .

Jovanović, Rastko D., Swiatkowski, Bartosz, Cvetinović, Dejan, Stefanović, Predrag Lj., Marković, Zoran J., Pavlović, Zoran, "Turbulent two-phase flow modeling of air-coal mixture channels with single blade turbulators" in AIP Conference Proceedings, 936, no. 1 (2007):300-303,
https://doi.org/10.1063/1.2790135 .,
https://hdl.handle.net/21.15107/rcub_vinar_6703 .

TY  - CONF
AU  - Pavlović, Zoran
AU  - Cvetinović, Dejan
AU  - Stefanović, Predrag
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12747
C3  - CHISA 2006 : 17th International Congress of Chemical and Process Engineering : Proceedings
T1  - Investigation of gas-solid particles turbulent channel flow using large eddy simulation
SP  - 70283
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12747
ER  - 

@conference{
author = "Pavlović, Zoran and Cvetinović, Dejan and Stefanović, Predrag",
year = "2006",
journal = "CHISA 2006 : 17th International Congress of Chemical and Process Engineering : Proceedings",
title = "Investigation of gas-solid particles turbulent channel flow using large eddy simulation",
pages = "70283",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12747"
}

Pavlović, Z., Cvetinović, D.,& Stefanović, P.. (2006). Investigation of gas-solid particles turbulent channel flow using large eddy simulation. in CHISA 2006 : 17th International Congress of Chemical and Process Engineering : Proceedings, 70283.
https://hdl.handle.net/21.15107/rcub_vinar_12747

Pavlović Z, Cvetinović D, Stefanović P. Investigation of gas-solid particles turbulent channel flow using large eddy simulation. in CHISA 2006 : 17th International Congress of Chemical and Process Engineering : Proceedings. 2006;:70283.
https://hdl.handle.net/21.15107/rcub_vinar_12747 .

Pavlović, Zoran, Cvetinović, Dejan, Stefanović, Predrag, "Investigation of gas-solid particles turbulent channel flow using large eddy simulation" in CHISA 2006 : 17th International Congress of Chemical and Process Engineering : Proceedings (2006):70283,
https://hdl.handle.net/21.15107/rcub_vinar_12747 .