TY  - GEN
AU  - Bošnjak, Srđan
AU  - Gnjatović, Nebojša
AU  - Petković, Zoran D.
AU  - Milojević, Goran
AU  - Milenović, Ivan Lj.
AU  - Stefanović, Aleksandar Z.
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5045
AB  - Сопствена тежина подсистема стреле ротора доминантно утиче на интензитет силе у ужету механизма за промену угла нагиба стреле ротора [1]. Осим тога, положај тежишта обртне горње градње значајно утиче на дистрибуцију оптерећења унутар радиаксијалног лежаја којим се обртна горња градња ослања на доњу градњу, а тиме и на његов век [4,5]. На основу изложених чињеница закључује се да прецизна идентификација основних параметара статичке стабилности (ОПСС: тежина и положај тежишта) омогућава: (1) поуздано подешавање граничних вредности сила у ужадима механизма за промену угла нагиба стреле ротора, које представљају основну заштиту од губитка статичке стабилности обртне горње градње; (2) идентификацију оптерећења кука‐хватаљки, које спречавају губитак статичке стабилности у екстремним случајевима оптерећења; (3) одређивање неравномерности оптерећења котрљајних тела радиаксијалног лежаја за ослањање обртне горње градње.
Основне експлоатационе карактеристике, поузданост и безбедност роторних багера доминантно одређују параметри горње градње. Они се могу сврстати у три основне групе: (1) параметри који одређују статичку стабилност горње градње; (2) параметри који одређују чврстоћу горње градње; (3) параметри који одређују динамичко понашање горње градње. Заједнички именитељ свих наведених параметара јесте маса горње градње односно, њена дистрибуција по структури. Зато се одређивању ОПСС, мора посветити посебна пажња у свим фазама пројектовања роторног багера. Чак и код светски реномираних произвођача роторних багера јављају се знатне разлике поменутих параметара горње градње током развоја пројекта, што је најчешће последица накнадних захтева купца, или немогућности набавке пројектом предвиђених компоненти. Управо због тога, након завршетка монтаже машине обавезно се врши експериментално одређивање тежине горње градње и положаја њеног тежишта [7‐10] са циљем да се изврши валидација пројектованих ОПСС [11,12]. Према цитираној литератури, поступак валидације изводи се упоређивањем пројектоване и измерене тежине горње градње. Уколико је разлика измерене и пројектоване тежине већа од 5%, онда се захтева понављање и прорачуна и вагања. О упоређивању положаја тежишта, одређеног аналитички и експериментом, у цитираној литератури нема ни помена. С обзиром на чињеницу да се у литератури [2‐12], као ни у [13‐16], дакле у целокупној литератури и техничкој регулативи која је била доступна ауторима, нигде не наводи могућност спрезања резултата добијених аналитички и експериментом, техничким решењем постављен је оригинални метод формирања аналитичког модела обртне горње градње потпуно усаглашеног са изведеним стањем утврђеним експериментом.
Суштину техничког решења и његову примену код роторног багера SchRs 1600 аутори су
публиковали у часопису Journal of Zhejiang University ‐ SCIENCE A (категорија М22) као рад под називом „Basic parameters of the static stability, loads and strength of the vital parts of the bucket wheel excavator’s slewing superstructure“ (https://doi.org/10.1631/jzus.A1500037), Прилог 3. Поменути рад представља први рад из области идентификације и оцене основних параметара статичке стабилности роторних багера објављен у часопису са SCI листе, што сведочи о научном потенцијалу техничког решења.
PB  - University of Belgrade, Faculty of Mechanical Engineering
T2  - ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М83)
T1  - Примена 3Д модела за аналитичко‐експериментално одређивање параметара статичке стабилности и спољашњег оптерећења роторног багера
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5045
ER  - 

@misc{
author = "Bošnjak, Srđan and Gnjatović, Nebojša and Petković, Zoran D. and Milojević, Goran and Milenović, Ivan Lj. and Stefanović, Aleksandar Z.",
year = "2017",
abstract = "Сопствена тежина подсистема стреле ротора доминантно утиче на интензитет силе у ужету механизма за промену угла нагиба стреле ротора [1]. Осим тога, положај тежишта обртне горње градње значајно утиче на дистрибуцију оптерећења унутар радиаксијалног лежаја којим се обртна горња градња ослања на доњу градњу, а тиме и на његов век [4,5]. На основу изложених чињеница закључује се да прецизна идентификација основних параметара статичке стабилности (ОПСС: тежина и положај тежишта) омогућава: (1) поуздано подешавање граничних вредности сила у ужадима механизма за промену угла нагиба стреле ротора, које представљају основну заштиту од губитка статичке стабилности обртне горње градње; (2) идентификацију оптерећења кука‐хватаљки, које спречавају губитак статичке стабилности у екстремним случајевима оптерећења; (3) одређивање неравномерности оптерећења котрљајних тела радиаксијалног лежаја за ослањање обртне горње градње.
Основне експлоатационе карактеристике, поузданост и безбедност роторних багера доминантно одређују параметри горње градње. Они се могу сврстати у три основне групе: (1) параметри који одређују статичку стабилност горње градње; (2) параметри који одређују чврстоћу горње градње; (3) параметри који одређују динамичко понашање горње градње. Заједнички именитељ свих наведених параметара јесте маса горње градње односно, њена дистрибуција по структури. Зато се одређивању ОПСС, мора посветити посебна пажња у свим фазама пројектовања роторног багера. Чак и код светски реномираних произвођача роторних багера јављају се знатне разлике поменутих параметара горње градње током развоја пројекта, што је најчешће последица накнадних захтева купца, или немогућности набавке пројектом предвиђених компоненти. Управо због тога, након завршетка монтаже машине обавезно се врши експериментално одређивање тежине горње градње и положаја њеног тежишта [7‐10] са циљем да се изврши валидација пројектованих ОПСС [11,12]. Према цитираној литератури, поступак валидације изводи се упоређивањем пројектоване и измерене тежине горње градње. Уколико је разлика измерене и пројектоване тежине већа од 5%, онда се захтева понављање и прорачуна и вагања. О упоређивању положаја тежишта, одређеног аналитички и експериментом, у цитираној литератури нема ни помена. С обзиром на чињеницу да се у литератури [2‐12], као ни у [13‐16], дакле у целокупној литератури и техничкој регулативи која је била доступна ауторима, нигде не наводи могућност спрезања резултата добијених аналитички и експериментом, техничким решењем постављен је оригинални метод формирања аналитичког модела обртне горње градње потпуно усаглашеног са изведеним стањем утврђеним експериментом.
Суштину техничког решења и његову примену код роторног багера SchRs 1600 аутори су
публиковали у часопису Journal of Zhejiang University ‐ SCIENCE A (категорија М22) као рад под називом „Basic parameters of the static stability, loads and strength of the vital parts of the bucket wheel excavator’s slewing superstructure“ (https://doi.org/10.1631/jzus.A1500037), Прилог 3. Поменути рад представља први рад из области идентификације и оцене основних параметара статичке стабилности роторних багера објављен у часопису са SCI листе, што сведочи о научном потенцијалу техничког решења.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М83)",
title = "Примена 3Д модела за аналитичко‐експериментално одређивање параметара статичке стабилности и спољашњег оптерећења роторног багера",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5045"
}

Bošnjak, S., Gnjatović, N., Petković, Z. D., Milojević, G., Milenović, I. Lj.,& Stefanović, A. Z.. (2017). Примена 3Д модела за аналитичко‐експериментално одређивање параметара статичке стабилности и спољашњег оптерећења роторног багера. in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М83)
University of Belgrade, Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_5045

Bošnjak S, Gnjatović N, Petković ZD, Milojević G, Milenović IL, Stefanović AZ. Примена 3Д модела за аналитичко‐експериментално одређивање параметара статичке стабилности и спољашњег оптерећења роторног багера. in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М83). 2017;.
https://hdl.handle.net/21.15107/rcub_machinery_5045 .

Bošnjak, Srđan, Gnjatović, Nebojša, Petković, Zoran D., Milojević, Goran, Milenović, Ivan Lj., Stefanović, Aleksandar Z., "Примена 3Д модела за аналитичко‐експериментално одређивање параметара статичке стабилности и спољашњег оптерећења роторног багера" in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М83) (2017),
https://hdl.handle.net/21.15107/rcub_machinery_5045 .

TY  - CONF
AU  - Petković, Zoran D.
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
AU  - Milojević, Goran
AU  - Stefanović, Aleksandar Z.
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4922
AB  - Mounting and dismantling of large-scale mechanical systems is a complex engineering challenge due to several factors, such as structural diversity and size of handled structures, limited 
maneuvering options, and absence of related literature, to name the few, all of which make each problem unique. Numerous disasters throughout the history created a need for a safe approach to the problem of executing such procedures risk-free, while preserving the structural integrity and functionality of the structures. One of the most reliable methods is the application of unique below-the hook lifting devices and the goal of this paper is to present the benefits of their use via two examples. Case 1 deals with dismounting of dated constructions in a densely populated area, with limited structural data provided. Case 2 is focused on mounting of a large-scale roof structure in harsh boundary conditions, with limited maneuvering space. Results presented in this paper represent a contribution to the field of below-the hook lifting devices.
PB  - SaTCIP
C3  - Proceedings of the XXI International Conference MHCL’15
T1  - Specific Engineering Challenges During the Large-Scale Structures’ Mantling and Dismantling Procedures
EP  - 240
SP  - 235
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4922
ER  - 

@conference{
author = "Petković, Zoran D. and Gnjatović, Nebojša and Milenović, Ivan Lj. and Milojević, Goran and Stefanović, Aleksandar Z.",
year = "2015",
abstract = "Mounting and dismantling of large-scale mechanical systems is a complex engineering challenge due to several factors, such as structural diversity and size of handled structures, limited 
maneuvering options, and absence of related literature, to name the few, all of which make each problem unique. Numerous disasters throughout the history created a need for a safe approach to the problem of executing such procedures risk-free, while preserving the structural integrity and functionality of the structures. One of the most reliable methods is the application of unique below-the hook lifting devices and the goal of this paper is to present the benefits of their use via two examples. Case 1 deals with dismounting of dated constructions in a densely populated area, with limited structural data provided. Case 2 is focused on mounting of a large-scale roof structure in harsh boundary conditions, with limited maneuvering space. Results presented in this paper represent a contribution to the field of below-the hook lifting devices.",
publisher = "SaTCIP",
journal = "Proceedings of the XXI International Conference MHCL’15",
title = "Specific Engineering Challenges During the Large-Scale Structures’ Mantling and Dismantling Procedures",
pages = "240-235",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4922"
}

Petković, Z. D., Gnjatović, N., Milenović, I. Lj., Milojević, G.,& Stefanović, A. Z.. (2015). Specific Engineering Challenges During the Large-Scale Structures’ Mantling and Dismantling Procedures. in Proceedings of the XXI International Conference MHCL’15
SaTCIP., 235-240.
https://hdl.handle.net/21.15107/rcub_machinery_4922

Petković ZD, Gnjatović N, Milenović IL, Milojević G, Stefanović AZ. Specific Engineering Challenges During the Large-Scale Structures’ Mantling and Dismantling Procedures. in Proceedings of the XXI International Conference MHCL’15. 2015;:235-240.
https://hdl.handle.net/21.15107/rcub_machinery_4922 .

Petković, Zoran D., Gnjatović, Nebojša, Milenović, Ivan Lj., Milojević, Goran, Stefanović, Aleksandar Z., "Specific Engineering Challenges During the Large-Scale Structures’ Mantling and Dismantling Procedures" in Proceedings of the XXI International Conference MHCL’15 (2015):235-240,
https://hdl.handle.net/21.15107/rcub_machinery_4922 .

TY  - CONF
AU  - Petković, Zoran D.
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
AU  - Milojević, Goran
AU  - Stefanović, Aleksandar Z.
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4916
AB  - Mounting of large-scale mechanical systems involves lifting and positioning of the so-called specific loads, namely structures of great dimensions and masses whose functionality and structural integrity should not be jeopardized during the realization of the erection procedures. Two examples of spatial truss roof construction mountings are presented in this paper as case 1, underlying the effect of unique lifting device usage on uniform load distribution on the structures being lifted. Case 2 deals with mounting of three tall vertical pressure vessels of different weights and heights with the same lifting gear and traverse specially designed to accomplish the aforementioned tasks. Case 3 is focused on the redesign of the existing traverse in order to fulfill the task of lifting and precise positioning of the bucket wheel excavator segment, a truss structure of a great span, weighing 90 t. Results presented in this paper represent a contribution in the field of below-the-hook lifting devices design, arising from the specificity of engineering problems dealing with mounting of large-scale structures.
PB  - SaTCIP
C3  - 14th International Conference "Research and Development in Mechanical Industry" RaDMI 2014
T1  - Design of unique below-the-hook lifting devices for specific loads
EP  - 51
SP  - 44
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4916
ER  - 

@conference{
author = "Petković, Zoran D. and Gnjatović, Nebojša and Milenović, Ivan Lj. and Milojević, Goran and Stefanović, Aleksandar Z.",
year = "2014",
abstract = "Mounting of large-scale mechanical systems involves lifting and positioning of the so-called specific loads, namely structures of great dimensions and masses whose functionality and structural integrity should not be jeopardized during the realization of the erection procedures. Two examples of spatial truss roof construction mountings are presented in this paper as case 1, underlying the effect of unique lifting device usage on uniform load distribution on the structures being lifted. Case 2 deals with mounting of three tall vertical pressure vessels of different weights and heights with the same lifting gear and traverse specially designed to accomplish the aforementioned tasks. Case 3 is focused on the redesign of the existing traverse in order to fulfill the task of lifting and precise positioning of the bucket wheel excavator segment, a truss structure of a great span, weighing 90 t. Results presented in this paper represent a contribution in the field of below-the-hook lifting devices design, arising from the specificity of engineering problems dealing with mounting of large-scale structures.",
publisher = "SaTCIP",
journal = "14th International Conference "Research and Development in Mechanical Industry" RaDMI 2014",
title = "Design of unique below-the-hook lifting devices for specific loads",
pages = "51-44",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4916"
}

Petković, Z. D., Gnjatović, N., Milenović, I. Lj., Milojević, G.,& Stefanović, A. Z.. (2014). Design of unique below-the-hook lifting devices for specific loads. in 14th International Conference "Research and Development in Mechanical Industry" RaDMI 2014
SaTCIP., 44-51.
https://hdl.handle.net/21.15107/rcub_machinery_4916

Petković ZD, Gnjatović N, Milenović IL, Milojević G, Stefanović AZ. Design of unique below-the-hook lifting devices for specific loads. in 14th International Conference "Research and Development in Mechanical Industry" RaDMI 2014. 2014;:44-51.
https://hdl.handle.net/21.15107/rcub_machinery_4916 .

Petković, Zoran D., Gnjatović, Nebojša, Milenović, Ivan Lj., Milojević, Goran, Stefanović, Aleksandar Z., "Design of unique below-the-hook lifting devices for specific loads" in 14th International Conference "Research and Development in Mechanical Industry" RaDMI 2014 (2014):44-51,
https://hdl.handle.net/21.15107/rcub_machinery_4916 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Momčilović, Dejan B.
AU  - Petković, Zoran D.
AU  - Pantelić, Milorad P.
AU  - Gnjatović, Nebojša
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1706
AB  - The high mobility of open pit machines in heavy duty conditions provides fertile ground for the occurrence of various failures of the traveling mechanisms' vital parts such as chain links. The goal of the study presented in this paper was to diagnose the cause of the damage of the bucket wheel excavator crawler chain links. In order to identify the reasons behind chain link failures, stress state calculations were performed as well as experimental investigations which, given the nature of the failure, included visual and metallographic examinations, chemical composition analysis and tests of mechanical properties. Based on the results of the numerical-experimental analyses, it was concluded that the chain link breakdowns are caused by 'manufacturing-in' defects. The results of the presented analyses also emphasize the importance of a comprehensive quality control of chain links.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Failure investigation of the bucket wheel excavator crawler chain link
EP  - 469
SP  - 462
VL  - 35
DO  - 10.1016/j.engfailanal.2013.04.025
ER  - 

@article{
author = "Bošnjak, Srđan and Momčilović, Dejan B. and Petković, Zoran D. and Pantelić, Milorad P. and Gnjatović, Nebojša",
year = "2013",
abstract = "The high mobility of open pit machines in heavy duty conditions provides fertile ground for the occurrence of various failures of the traveling mechanisms' vital parts such as chain links. The goal of the study presented in this paper was to diagnose the cause of the damage of the bucket wheel excavator crawler chain links. In order to identify the reasons behind chain link failures, stress state calculations were performed as well as experimental investigations which, given the nature of the failure, included visual and metallographic examinations, chemical composition analysis and tests of mechanical properties. Based on the results of the numerical-experimental analyses, it was concluded that the chain link breakdowns are caused by 'manufacturing-in' defects. The results of the presented analyses also emphasize the importance of a comprehensive quality control of chain links.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Failure investigation of the bucket wheel excavator crawler chain link",
pages = "469-462",
volume = "35",
doi = "10.1016/j.engfailanal.2013.04.025"
}

Bošnjak, S., Momčilović, D. B., Petković, Z. D., Pantelić, M. P.,& Gnjatović, N.. (2013). Failure investigation of the bucket wheel excavator crawler chain link. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 35, 462-469.
https://doi.org/10.1016/j.engfailanal.2013.04.025

Bošnjak S, Momčilović DB, Petković ZD, Pantelić MP, Gnjatović N. Failure investigation of the bucket wheel excavator crawler chain link. in Engineering Failure Analysis. 2013;35:462-469.
doi:10.1016/j.engfailanal.2013.04.025 .

Bošnjak, Srđan, Momčilović, Dejan B., Petković, Zoran D., Pantelić, Milorad P., Gnjatović, Nebojša, "Failure investigation of the bucket wheel excavator crawler chain link" in Engineering Failure Analysis, 35 (2013):462-469,
https://doi.org/10.1016/j.engfailanal.2013.04.025 . .

TY  - CONF
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Gnjatović, Nebojša
AU  - Mihajlović, Vaso M.
AU  - Milojević, Goran
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4912
AB  - The extremely heavy duty conditions of the Surface Mining Machines (SMM) provide fertile ground for the occurrence of the various types of failures in their travelling mechanisms and belonging substructures. Although failures of the SMM travelling mechanisms occur infrequently, they may lead to very serious or even disastrous consequences. Even in cases when consequences are not catastrophic they cause direct costs, as well as indirect costs due to the downtime that substantially diminishes the effects of SMM exploitation. Furthermore, replacement of damaged parts is executed on site, often in hard working conditions that essentially prolong the downtime of the complete surface mining system. This paper discusses the causes of the failures in the vital parts of the crawler travel gear of the bucket wheel excavators and spreaders: chain links, track wheels, two-wheel bogies and undercarriage. Based on the results of the analytical–numerical–experimental analyses, it was concluded
that: (a) chain links' failures are caused by 'manufacturing-in' defects; (b) track wheels'
failures are caused by 'design-in' and ' manufacturing-in' defects; (c) failures of the twowheel bogies and undercarriage are caused by 'design-in' defects. Besides that, the redesigned structures of the two-wheel bogies and undercarriage are presented. The validity of the presented reconstruction designs are unquestionably confirmed by their failure less exploitation after the reconstruction. Finally, the obtained results are important because the same problems could arise in the crawler travelling mechanisms of wide class of earthmoving and material handling machines.
PB  - Banja Luka : Faculty of Mechanical Engineering
C3  - Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology
T1  - Strength problems of the travelling mechanisms of the open pit machines
EP  - 254
SP  - 249
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4912
ER  - 

@conference{
author = "Bošnjak, Srđan and Petković, Zoran D. and Gnjatović, Nebojša and Mihajlović, Vaso M. and Milojević, Goran",
year = "2013",
abstract = "The extremely heavy duty conditions of the Surface Mining Machines (SMM) provide fertile ground for the occurrence of the various types of failures in their travelling mechanisms and belonging substructures. Although failures of the SMM travelling mechanisms occur infrequently, they may lead to very serious or even disastrous consequences. Even in cases when consequences are not catastrophic they cause direct costs, as well as indirect costs due to the downtime that substantially diminishes the effects of SMM exploitation. Furthermore, replacement of damaged parts is executed on site, often in hard working conditions that essentially prolong the downtime of the complete surface mining system. This paper discusses the causes of the failures in the vital parts of the crawler travel gear of the bucket wheel excavators and spreaders: chain links, track wheels, two-wheel bogies and undercarriage. Based on the results of the analytical–numerical–experimental analyses, it was concluded
that: (a) chain links' failures are caused by 'manufacturing-in' defects; (b) track wheels'
failures are caused by 'design-in' and ' manufacturing-in' defects; (c) failures of the twowheel bogies and undercarriage are caused by 'design-in' defects. Besides that, the redesigned structures of the two-wheel bogies and undercarriage are presented. The validity of the presented reconstruction designs are unquestionably confirmed by their failure less exploitation after the reconstruction. Finally, the obtained results are important because the same problems could arise in the crawler travelling mechanisms of wide class of earthmoving and material handling machines.",
publisher = "Banja Luka : Faculty of Mechanical Engineering",
journal = "Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology",
title = "Strength problems of the travelling mechanisms of the open pit machines",
pages = "254-249",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4912"
}

Bošnjak, S., Petković, Z. D., Gnjatović, N., Mihajlović, V. M.,& Milojević, G.. (2013). Strength problems of the travelling mechanisms of the open pit machines. in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology
Banja Luka : Faculty of Mechanical Engineering., 249-254.
https://hdl.handle.net/21.15107/rcub_machinery_4912

Bošnjak S, Petković ZD, Gnjatović N, Mihajlović VM, Milojević G. Strength problems of the travelling mechanisms of the open pit machines. in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology. 2013;:249-254.
https://hdl.handle.net/21.15107/rcub_machinery_4912 .

Bošnjak, Srđan, Petković, Zoran D., Gnjatović, Nebojša, Mihajlović, Vaso M., Milojević, Goran, "Strength problems of the travelling mechanisms of the open pit machines" in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology (2013):249-254,
https://hdl.handle.net/21.15107/rcub_machinery_4912 .

TY  - CONF
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Arsić, Miodrag
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4910
AB  - Design of the buckets of the bucket wheel excavators has to meet the set of the functional requirements imposed by the processes of: (a) soil cutting; (b) filling; (c) transportation of the grabbed soil; (d) emptying. Optimal conduct of each of these processes imposes requirements, which are often in mutual collision. Except functional requirements, bucket structure has to meet, naturally, rigidity as well as strength criterion. During exploitation in harsh working conditions, failures of buckets occur relatively frequently. There are two basic types of bucket failures: structural and technological. In this paper, two bucket structural failures as well as one technological bucket failure are presented. Investigations' results pointed out that structural failures are caused by 'design-in' as well 'manufacturing-in' defects. Technological failure of the bucket was also of the 'design-in' type. Besides that, the redesigned buckets' are presented. Exploitation after the reconstruction fully confirmed the validity of the presented reconstruction design.
PB  - Banja Luka : Faculty of Mechanical Engineering
C3  - Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology
T1  - Buckets of the bucket wheel excavators: failures and redesign
EP  - 248
SP  - 243
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4910
ER  - 

@conference{
author = "Bošnjak, Srđan and Petković, Zoran D. and Arsić, Miodrag and Gnjatović, Nebojša and Milenović, Ivan Lj.",
year = "2013",
abstract = "Design of the buckets of the bucket wheel excavators has to meet the set of the functional requirements imposed by the processes of: (a) soil cutting; (b) filling; (c) transportation of the grabbed soil; (d) emptying. Optimal conduct of each of these processes imposes requirements, which are often in mutual collision. Except functional requirements, bucket structure has to meet, naturally, rigidity as well as strength criterion. During exploitation in harsh working conditions, failures of buckets occur relatively frequently. There are two basic types of bucket failures: structural and technological. In this paper, two bucket structural failures as well as one technological bucket failure are presented. Investigations' results pointed out that structural failures are caused by 'design-in' as well 'manufacturing-in' defects. Technological failure of the bucket was also of the 'design-in' type. Besides that, the redesigned buckets' are presented. Exploitation after the reconstruction fully confirmed the validity of the presented reconstruction design.",
publisher = "Banja Luka : Faculty of Mechanical Engineering",
journal = "Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology",
title = "Buckets of the bucket wheel excavators: failures and redesign",
pages = "248-243",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4910"
}

Bošnjak, S., Petković, Z. D., Arsić, M., Gnjatović, N.,& Milenović, I. Lj.. (2013). Buckets of the bucket wheel excavators: failures and redesign. in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology
Banja Luka : Faculty of Mechanical Engineering., 243-248.
https://hdl.handle.net/21.15107/rcub_machinery_4910

Bošnjak S, Petković ZD, Arsić M, Gnjatović N, Milenović IL. Buckets of the bucket wheel excavators: failures and redesign. in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology. 2013;:243-248.
https://hdl.handle.net/21.15107/rcub_machinery_4910 .

Bošnjak, Srđan, Petković, Zoran D., Arsić, Miodrag, Gnjatović, Nebojša, Milenović, Ivan Lj., "Buckets of the bucket wheel excavators: failures and redesign" in Proceedings of the 11th International conference on accomplishments in Electrical and Mechanical Engineering and Information Technology (2013):243-248,
https://hdl.handle.net/21.15107/rcub_machinery_4910 .

TY  - CONF
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
AU  - Milojević, Goran
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4908
AB  - This paper presents the results of the study dedicated to the problem of the bucket wheel excavator equalizing system (ES) strength. Finite element analysis of two wheel (TWB), four wheel (FWB) and eight wheel (EWB) bogies were conducted in order to determine weak points in ES structure. Strength and carrying capacity of FWB and EWB structures might be jeopardized due to their insufficient strength under lateral forces acting during curve travel. Severe failure of similar TWB structure is also presented and certain paraleles were made.
PB  - SaTCIP
C3  - 13th International Conference "Research and Development in Mechanical Industry" RaDMI 2013
T1  - Strength analysis of bucket wheel excavator’s eight wheel equalizing system
EP  - 10
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4908
ER  - 

@conference{
author = "Bošnjak, Srđan and Petković, Zoran D. and Gnjatović, Nebojša and Milenović, Ivan Lj. and Milojević, Goran",
year = "2013",
abstract = "This paper presents the results of the study dedicated to the problem of the bucket wheel excavator equalizing system (ES) strength. Finite element analysis of two wheel (TWB), four wheel (FWB) and eight wheel (EWB) bogies were conducted in order to determine weak points in ES structure. Strength and carrying capacity of FWB and EWB structures might be jeopardized due to their insufficient strength under lateral forces acting during curve travel. Severe failure of similar TWB structure is also presented and certain paraleles were made.",
publisher = "SaTCIP",
journal = "13th International Conference "Research and Development in Mechanical Industry" RaDMI 2013",
title = "Strength analysis of bucket wheel excavator’s eight wheel equalizing system",
pages = "10-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4908"
}

Bošnjak, S., Petković, Z. D., Gnjatović, N., Milenović, I. Lj.,& Milojević, G.. (2013). Strength analysis of bucket wheel excavator’s eight wheel equalizing system. in 13th International Conference "Research and Development in Mechanical Industry" RaDMI 2013
SaTCIP., 1-10.
https://hdl.handle.net/21.15107/rcub_machinery_4908

Bošnjak S, Petković ZD, Gnjatović N, Milenović IL, Milojević G. Strength analysis of bucket wheel excavator’s eight wheel equalizing system. in 13th International Conference "Research and Development in Mechanical Industry" RaDMI 2013. 2013;:1-10.
https://hdl.handle.net/21.15107/rcub_machinery_4908 .

Bošnjak, Srđan, Petković, Zoran D., Gnjatović, Nebojša, Milenović, Ivan Lj., Milojević, Goran, "Strength analysis of bucket wheel excavator’s eight wheel equalizing system" in 13th International Conference "Research and Development in Mechanical Industry" RaDMI 2013 (2013):1-10,
https://hdl.handle.net/21.15107/rcub_machinery_4908 .

TY  - GEN
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Đorđević, Miloš
AU  - Gnjatović, Nebojša
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5272
AB  - Редизајном радног уређаја багера SchRs 350 / 5 x 12 у потпуности се отклањају недостаци оригиналног решења који се односе на приступачност, могућност санације или замене оштећених подсклопова. Ниво напонског стања редизајнираног тела ротора нижи је у односу на постојеће решење. Осим тога, знатно је повољнији и утицај оптерећења изазваног отпором копања на структуру багера. Смањење учестаности обртања ротора
компензовано је повећањем броја кашика, тако да је остварено и извесно повећање капацитета. Коначно, уградња планетарног редуктора који се користи код багера типа SchRs 630 (укупно 4 багера овог типа налазе се у РБ “Колубара”) доприноси унификацији, што олакшава одржавање машине.
Реализацијом пројекта остварује се, у суштини, парцијална ревитализација багера и продужава век његове експлоатације.
На основу упоредне анализе главних параметара машине закључује се да ревитализовани багер има већи капацитет (38,3 % у односу на референтни режим рада пре ревитализације), као и могућност остваривања веће силе резања (29,2 % за референтни режим рада пре ревитализације).
PB  - University of Belgrade, Faculty of Mechanical Engineering
T2  - ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84)
T1  - Ревитализација роторног багера SchRs 350
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5272
ER  - 

@misc{
author = "Bošnjak, Srđan and Petković, Zoran D. and Đorđević, Miloš and Gnjatović, Nebojša",
year = "2013",
abstract = "Редизајном радног уређаја багера SchRs 350 / 5 x 12 у потпуности се отклањају недостаци оригиналног решења који се односе на приступачност, могућност санације или замене оштећених подсклопова. Ниво напонског стања редизајнираног тела ротора нижи је у односу на постојеће решење. Осим тога, знатно је повољнији и утицај оптерећења изазваног отпором копања на структуру багера. Смањење учестаности обртања ротора
компензовано је повећањем броја кашика, тако да је остварено и извесно повећање капацитета. Коначно, уградња планетарног редуктора који се користи код багера типа SchRs 630 (укупно 4 багера овог типа налазе се у РБ “Колубара”) доприноси унификацији, што олакшава одржавање машине.
Реализацијом пројекта остварује се, у суштини, парцијална ревитализација багера и продужава век његове експлоатације.
На основу упоредне анализе главних параметара машине закључује се да ревитализовани багер има већи капацитет (38,3 % у односу на референтни режим рада пре ревитализације), као и могућност остваривања веће силе резања (29,2 % за референтни режим рада пре ревитализације).",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84)",
title = "Ревитализација роторног багера SchRs 350",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5272"
}

Bošnjak, S., Petković, Z. D., Đorđević, M.,& Gnjatović, N.. (2013). Ревитализација роторног багера SchRs 350. in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84)
University of Belgrade, Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_5272

Bošnjak S, Petković ZD, Đorđević M, Gnjatović N. Ревитализација роторног багера SchRs 350. in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84). 2013;.
https://hdl.handle.net/21.15107/rcub_machinery_5272 .

Bošnjak, Srđan, Petković, Zoran D., Đorđević, Miloš, Gnjatović, Nebojša, "Ревитализација роторног багера SchRs 350" in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84) (2013),
https://hdl.handle.net/21.15107/rcub_machinery_5272 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Atanasovska, Ivana
AU  - Milojević, Goran
AU  - Mihajlović, Vaso M.
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1724
AB  - The supporting truss of the counterweight boom is a vital part of the bucket chain excavator's (BCE) superstructure. The occurrence and propagation of cracks in the supporting truss columns' heads may lead to BCE collapse. The goals of the study presented in this paper were to: (a) diagnose the cause of cracks occurrence; (b) define the reconstruction design of the supporting truss columns and (c) validate the reconstructed structure by numerical-experimental analysis. In order to clarify the causes of cracks occurrence, experimental investigations were performed with the purpose of defining the chemical composition, tensile properties, impact toughness and macrohardness of the columns' material. Metallographic examinations were also conducted. Based on the results of finite elements analyses (FEA) and experimental analyses it can be concluded that cracks are caused by the 'design-in' defects. The redesign solution enabled repair and reconstruction in field conditions, without previously dismantling any substructure of the BCE superstructure. Thereby the time required for performing reconstruction is shortened and indirect costs due to the BCE downtime are considerably diminished. Both the experimental analysis of the stress state of the reconstructed columns in regular working conditions and the failure-free exploitation have confirmed the validity of the reconstruction design, while the BCE excavated approximately 8.5 x 10(6) t of coal and 1.8 x 10(6) m(3) of overburden after the reconstruction.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Bucket chain excavator: Failure analysis and redesign of the counterweight boom supporting truss columns
EP  - 333
SP  - 322
VL  - 32
DO  - 10.1016/j.engfailanal.2013.04.012
ER  - 

@article{
author = "Bošnjak, Srđan and Petković, Zoran D. and Atanasovska, Ivana and Milojević, Goran and Mihajlović, Vaso M.",
year = "2013",
abstract = "The supporting truss of the counterweight boom is a vital part of the bucket chain excavator's (BCE) superstructure. The occurrence and propagation of cracks in the supporting truss columns' heads may lead to BCE collapse. The goals of the study presented in this paper were to: (a) diagnose the cause of cracks occurrence; (b) define the reconstruction design of the supporting truss columns and (c) validate the reconstructed structure by numerical-experimental analysis. In order to clarify the causes of cracks occurrence, experimental investigations were performed with the purpose of defining the chemical composition, tensile properties, impact toughness and macrohardness of the columns' material. Metallographic examinations were also conducted. Based on the results of finite elements analyses (FEA) and experimental analyses it can be concluded that cracks are caused by the 'design-in' defects. The redesign solution enabled repair and reconstruction in field conditions, without previously dismantling any substructure of the BCE superstructure. Thereby the time required for performing reconstruction is shortened and indirect costs due to the BCE downtime are considerably diminished. Both the experimental analysis of the stress state of the reconstructed columns in regular working conditions and the failure-free exploitation have confirmed the validity of the reconstruction design, while the BCE excavated approximately 8.5 x 10(6) t of coal and 1.8 x 10(6) m(3) of overburden after the reconstruction.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Bucket chain excavator: Failure analysis and redesign of the counterweight boom supporting truss columns",
pages = "333-322",
volume = "32",
doi = "10.1016/j.engfailanal.2013.04.012"
}

Bošnjak, S., Petković, Z. D., Atanasovska, I., Milojević, G.,& Mihajlović, V. M.. (2013). Bucket chain excavator: Failure analysis and redesign of the counterweight boom supporting truss columns. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 32, 322-333.
https://doi.org/10.1016/j.engfailanal.2013.04.012

Bošnjak S, Petković ZD, Atanasovska I, Milojević G, Mihajlović VM. Bucket chain excavator: Failure analysis and redesign of the counterweight boom supporting truss columns. in Engineering Failure Analysis. 2013;32:322-333.
doi:10.1016/j.engfailanal.2013.04.012 .

Bošnjak, Srđan, Petković, Zoran D., Atanasovska, Ivana, Milojević, Goran, Mihajlović, Vaso M., "Bucket chain excavator: Failure analysis and redesign of the counterweight boom supporting truss columns" in Engineering Failure Analysis, 32 (2013):322-333,
https://doi.org/10.1016/j.engfailanal.2013.04.012 . .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
AU  - Jerman, Boris
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1804
AB  - This paper presents the results of the study dedicated to the problem of the bucket wheel excavator two-wheel bogie (TWB) strength. Two variants of the TWB structure were analysed: the originally designed and the redesigned. Three calculation models for stress state identification were used for each of the variants. The first does not iclude the influence of the track wheel axle on the lateral loads distribution. The second model includes the mentioned influence while the third considers the track wheel axle as a structural part of the TWB. Validation of the FE models is done by FE simulation of the experiment carried out on an originally designed testing bench. The obtained results fully clarify the occurrence of cracks in the original TWB structure, as well as the considerable impact of the track wheel axles on the TWB structure stress state.
PB  - Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
T2  - Tehnički vjesnik
T1  - Impact of the track wheel axles on the strength of the bucket wheel excavator two-wheel bogie
EP  - 810
IS  - 5
SP  - 803
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1804
ER  - 

@article{
author = "Bošnjak, Srđan and Petković, Zoran D. and Gnjatović, Nebojša and Milenović, Ivan Lj. and Jerman, Boris",
year = "2013",
abstract = "This paper presents the results of the study dedicated to the problem of the bucket wheel excavator two-wheel bogie (TWB) strength. Two variants of the TWB structure were analysed: the originally designed and the redesigned. Three calculation models for stress state identification were used for each of the variants. The first does not iclude the influence of the track wheel axle on the lateral loads distribution. The second model includes the mentioned influence while the third considers the track wheel axle as a structural part of the TWB. Validation of the FE models is done by FE simulation of the experiment carried out on an originally designed testing bench. The obtained results fully clarify the occurrence of cracks in the original TWB structure, as well as the considerable impact of the track wheel axles on the TWB structure stress state.",
publisher = "Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek",
journal = "Tehnički vjesnik",
title = "Impact of the track wheel axles on the strength of the bucket wheel excavator two-wheel bogie",
pages = "810-803",
number = "5",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1804"
}

Bošnjak, S., Petković, Z. D., Gnjatović, N., Milenović, I. Lj.,& Jerman, B.. (2013). Impact of the track wheel axles on the strength of the bucket wheel excavator two-wheel bogie. in Tehnički vjesnik
Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek., 20(5), 803-810.
https://hdl.handle.net/21.15107/rcub_machinery_1804

Bošnjak S, Petković ZD, Gnjatović N, Milenović IL, Jerman B. Impact of the track wheel axles on the strength of the bucket wheel excavator two-wheel bogie. in Tehnički vjesnik. 2013;20(5):803-810.
https://hdl.handle.net/21.15107/rcub_machinery_1804 .

Bošnjak, Srđan, Petković, Zoran D., Gnjatović, Nebojša, Milenović, Ivan Lj., Jerman, Boris, "Impact of the track wheel axles on the strength of the bucket wheel excavator two-wheel bogie" in Tehnički vjesnik, 20, no. 5 (2013):803-810,
https://hdl.handle.net/21.15107/rcub_machinery_1804 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Simonović, Aleksandar
AU  - Zrnić, Nenad
AU  - Gnjatović, Nebojša
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1705
AB  - The traveling mechanism of the C-700S bucket wheel excavator is of the two-crawler type. Rigid connections between the undercarriage and the crawler beams offer a very high factor of safety against tipping but at the same time create unfavorable conditions for ground surface adaptation. Connections between the crawler beams and the undercarriage cylindrical girder were realized by means of connection girders with open cross sections (I sections). In order to eliminate the occurrence of cracks, the original undercarriage structure (variant I) has been redesigned (variant II). The key idea was to strengthen the already mentioned connection girders by building in vertical plates. In this way the cross-sections were closed and their torsional rigidity became considerably greater, which led to the adaptation of the traveling mechanism to the ground surface becoming practically impossible. Because of that alone, and within a very short period after the reconstruction, new cracks occurred on elements of the original structure and even on added structural elements. Based on the FEA results, it was concluded that cracks occurrence for variants I and II of the undercarriage structure is caused by highly pronounced stress concentration. Subtle load and stress analyses in various working regimes, presented in the paper, led to the achievement of a re-redesigned undercarriage structure (variant III) with more uniform stress distribution. Stress level in the critical zone for variant III of the undercarriage structure is considerably lower than stress levels for both variant (approximate to 2.1 times) and variant II (approximate to 2.5 times). It is very important to note that the weight of the new built-in elements for variant II is six times greater than that for variant III. During ensuing exploitation in extremely heavy duty conditions, no damages for variant III of the considered structure were observed.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - 'Designing-in' failures and redesign of bucket wheel excavator undercarriage
EP  - 103
SP  - 95
VL  - 35
DO  - 10.1016/j.engfailanal.2012.12.007
ER  - 

@article{
author = "Bošnjak, Srđan and Petković, Zoran D. and Simonović, Aleksandar and Zrnić, Nenad and Gnjatović, Nebojša",
year = "2013",
abstract = "The traveling mechanism of the C-700S bucket wheel excavator is of the two-crawler type. Rigid connections between the undercarriage and the crawler beams offer a very high factor of safety against tipping but at the same time create unfavorable conditions for ground surface adaptation. Connections between the crawler beams and the undercarriage cylindrical girder were realized by means of connection girders with open cross sections (I sections). In order to eliminate the occurrence of cracks, the original undercarriage structure (variant I) has been redesigned (variant II). The key idea was to strengthen the already mentioned connection girders by building in vertical plates. In this way the cross-sections were closed and their torsional rigidity became considerably greater, which led to the adaptation of the traveling mechanism to the ground surface becoming practically impossible. Because of that alone, and within a very short period after the reconstruction, new cracks occurred on elements of the original structure and even on added structural elements. Based on the FEA results, it was concluded that cracks occurrence for variants I and II of the undercarriage structure is caused by highly pronounced stress concentration. Subtle load and stress analyses in various working regimes, presented in the paper, led to the achievement of a re-redesigned undercarriage structure (variant III) with more uniform stress distribution. Stress level in the critical zone for variant III of the undercarriage structure is considerably lower than stress levels for both variant (approximate to 2.1 times) and variant II (approximate to 2.5 times). It is very important to note that the weight of the new built-in elements for variant II is six times greater than that for variant III. During ensuing exploitation in extremely heavy duty conditions, no damages for variant III of the considered structure were observed.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "'Designing-in' failures and redesign of bucket wheel excavator undercarriage",
pages = "103-95",
volume = "35",
doi = "10.1016/j.engfailanal.2012.12.007"
}

Bošnjak, S., Petković, Z. D., Simonović, A., Zrnić, N.,& Gnjatović, N.. (2013). 'Designing-in' failures and redesign of bucket wheel excavator undercarriage. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 35, 95-103.
https://doi.org/10.1016/j.engfailanal.2012.12.007

Bošnjak S, Petković ZD, Simonović A, Zrnić N, Gnjatović N. 'Designing-in' failures and redesign of bucket wheel excavator undercarriage. in Engineering Failure Analysis. 2013;35:95-103.
doi:10.1016/j.engfailanal.2012.12.007 .

Bošnjak, Srđan, Petković, Zoran D., Simonović, Aleksandar, Zrnić, Nenad, Gnjatović, Nebojša, "'Designing-in' failures and redesign of bucket wheel excavator undercarriage" in Engineering Failure Analysis, 35 (2013):95-103,
https://doi.org/10.1016/j.engfailanal.2012.12.007 . .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Zrnić, Nenad
AU  - Gašić, Vlada
AU  - Petković, Zoran D.
AU  - Simonović, Aleksandar
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1355
AB  - This paper discusses the problems of identifying external loads of multibucket machines for mechanization. External loads are dominantly dynamic with distinguished stochasticity in certain cases. The paper presents the procedures for determining external loads caused by resistance-to-excavation (for bucket wheel excavators) or grabbing soil (for bridge-type coal stacker-reclaimers), as well as a short description of the model upon which is based and defined the response of the stacker-reclaimer to the external changeable load. It points to the significance of the problem of identifying the external load, as well as to the potentially very detrimental and dangerous consequences of eventual shortcomings during solving the mentioned problem.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Equipment Manufacturing Technology
T1  - External Load Variability of Multibucket Machines for Mechanization
EP  - 683
SP  - 678
VL  - 422
DO  - 10.4028/www.scientific.net/AMR.422.678
ER  - 

@article{
author = "Bošnjak, Srđan and Zrnić, Nenad and Gašić, Vlada and Petković, Zoran D. and Simonović, Aleksandar",
year = "2012",
abstract = "This paper discusses the problems of identifying external loads of multibucket machines for mechanization. External loads are dominantly dynamic with distinguished stochasticity in certain cases. The paper presents the procedures for determining external loads caused by resistance-to-excavation (for bucket wheel excavators) or grabbing soil (for bridge-type coal stacker-reclaimers), as well as a short description of the model upon which is based and defined the response of the stacker-reclaimer to the external changeable load. It points to the significance of the problem of identifying the external load, as well as to the potentially very detrimental and dangerous consequences of eventual shortcomings during solving the mentioned problem.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Equipment Manufacturing Technology",
title = "External Load Variability of Multibucket Machines for Mechanization",
pages = "683-678",
volume = "422",
doi = "10.4028/www.scientific.net/AMR.422.678"
}

Bošnjak, S., Zrnić, N., Gašić, V., Petković, Z. D.,& Simonović, A.. (2012). External Load Variability of Multibucket Machines for Mechanization. in Equipment Manufacturing Technology
Trans Tech Publications Ltd, Durnten-Zurich., 422, 678-683.
https://doi.org/10.4028/www.scientific.net/AMR.422.678

Bošnjak S, Zrnić N, Gašić V, Petković ZD, Simonović A. External Load Variability of Multibucket Machines for Mechanization. in Equipment Manufacturing Technology. 2012;422:678-683.
doi:10.4028/www.scientific.net/AMR.422.678 .

Bošnjak, Srđan, Zrnić, Nenad, Gašić, Vlada, Petković, Zoran D., Simonović, Aleksandar, "External Load Variability of Multibucket Machines for Mechanization" in Equipment Manufacturing Technology, 422 (2012):678-683,
https://doi.org/10.4028/www.scientific.net/AMR.422.678 . .

TY  - CONF
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Zrnić, Nenad
AU  - Dunjić, Momčilo
AU  - Dragović, Branislav
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1344
AB  - Failures caused by heavy duty conditions, as well as the changes of technological requirements, are basic reasons for the redesign of specific substructures of the bucket wheel excavators (BWE). The efficient redesign should be based on subtle external load identification and sufficient accuracy of stress - strain states determination. This paper gives solutions of reconstruction and comparative stress analyses for original and redesigned representative and vital BWE subsystems - slewing platform, undercarriage and two wheel bogie. The efficiency of these reconstructions is unquestionably confirmed by failureless service of mentioned subsystems.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
C3  - Advances in Metallurgical and Mining Engineering
T1  - Redesign of the Bucket Wheel Excavators Substructures Based on the Comparative Stress - Strain Analysis
EP  - +
SP  - 660
VL  - 402
DO  - 10.4028/www.scientific.net/AMR.402.660
ER  - 

@conference{
author = "Bošnjak, Srđan and Petković, Zoran D. and Zrnić, Nenad and Dunjić, Momčilo and Dragović, Branislav",
year = "2012",
abstract = "Failures caused by heavy duty conditions, as well as the changes of technological requirements, are basic reasons for the redesign of specific substructures of the bucket wheel excavators (BWE). The efficient redesign should be based on subtle external load identification and sufficient accuracy of stress - strain states determination. This paper gives solutions of reconstruction and comparative stress analyses for original and redesigned representative and vital BWE subsystems - slewing platform, undercarriage and two wheel bogie. The efficiency of these reconstructions is unquestionably confirmed by failureless service of mentioned subsystems.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Advances in Metallurgical and Mining Engineering",
title = "Redesign of the Bucket Wheel Excavators Substructures Based on the Comparative Stress - Strain Analysis",
pages = "+-660",
volume = "402",
doi = "10.4028/www.scientific.net/AMR.402.660"
}

Bošnjak, S., Petković, Z. D., Zrnić, N., Dunjić, M.,& Dragović, B.. (2012). Redesign of the Bucket Wheel Excavators Substructures Based on the Comparative Stress - Strain Analysis. in Advances in Metallurgical and Mining Engineering
Trans Tech Publications Ltd, Durnten-Zurich., 402, 660-+.
https://doi.org/10.4028/www.scientific.net/AMR.402.660

Bošnjak S, Petković ZD, Zrnić N, Dunjić M, Dragović B. Redesign of the Bucket Wheel Excavators Substructures Based on the Comparative Stress - Strain Analysis. in Advances in Metallurgical and Mining Engineering. 2012;402:660-+.
doi:10.4028/www.scientific.net/AMR.402.660 .

Bošnjak, Srđan, Petković, Zoran D., Zrnić, Nenad, Dunjić, Momčilo, Dragović, Branislav, "Redesign of the Bucket Wheel Excavators Substructures Based on the Comparative Stress - Strain Analysis" in Advances in Metallurgical and Mining Engineering, 402 (2012):660-+,
https://doi.org/10.4028/www.scientific.net/AMR.402.660 . .

TY  - CONF
AU  - Bošnjak, Srđan
AU  - Zrnić, Nenad
AU  - Gašić, Vlada
AU  - Petković, Zoran D.
AU  - Milovančević, Milorad
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1480
AB  - The modern design methods lead to the objectivisation of the process of thinking, which is important for the new system development. The aim of objectivisation and decomposition of the design is obvious: it should enable a new approach in the problem solving and thinking of the designer, enriches the large quantity of new information, facts and ideas, which are important for the system designing. The first part of this paper gives a brief presentation of mobile elevating work platform structure response to the wind excitation in possible resonant states. The second part is dedicated to the dynamic analysis of the mega container crane structure subjected to the moving load.
C3  - Advanced Materials Research
T1  - Dynamic responses of mobile elevating work platform and mega container crane structures
EP  - 1543
SP  - 1539
VL  - 562-564
DO  - 10.4028/www.scientific.net/AMR.562-564.1539
ER  - 

@conference{
author = "Bošnjak, Srđan and Zrnić, Nenad and Gašić, Vlada and Petković, Zoran D. and Milovančević, Milorad",
year = "2012",
abstract = "The modern design methods lead to the objectivisation of the process of thinking, which is important for the new system development. The aim of objectivisation and decomposition of the design is obvious: it should enable a new approach in the problem solving and thinking of the designer, enriches the large quantity of new information, facts and ideas, which are important for the system designing. The first part of this paper gives a brief presentation of mobile elevating work platform structure response to the wind excitation in possible resonant states. The second part is dedicated to the dynamic analysis of the mega container crane structure subjected to the moving load.",
journal = "Advanced Materials Research",
title = "Dynamic responses of mobile elevating work platform and mega container crane structures",
pages = "1543-1539",
volume = "562-564",
doi = "10.4028/www.scientific.net/AMR.562-564.1539"
}

Bošnjak, S., Zrnić, N., Gašić, V., Petković, Z. D.,& Milovančević, M.. (2012). Dynamic responses of mobile elevating work platform and mega container crane structures. in Advanced Materials Research, 562-564, 1539-1543.
https://doi.org/10.4028/www.scientific.net/AMR.562-564.1539

Bošnjak S, Zrnić N, Gašić V, Petković ZD, Milovančević M. Dynamic responses of mobile elevating work platform and mega container crane structures. in Advanced Materials Research. 2012;562-564:1539-1543.
doi:10.4028/www.scientific.net/AMR.562-564.1539 .

Bošnjak, Srđan, Zrnić, Nenad, Gašić, Vlada, Petković, Zoran D., Milovančević, Milorad, "Dynamic responses of mobile elevating work platform and mega container crane structures" in Advanced Materials Research, 562-564 (2012):1539-1543,
https://doi.org/10.4028/www.scientific.net/AMR.562-564.1539 . .

TY  - CONF
AU  - Petković, Zoran D.
AU  - Bošnjak, Srđan
AU  - Gnjatović, Nebojša
AU  - Mihajlović, Vaso M.
AU  - Milojević, Goran
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4905
AB  - Bucket wheel excavator SchRs 350/5x12 is one of the oldest mining
machines still operating in open pit mines in Serbia. Bucket wheel drive
gearbox of classical type had to be substituted with planetary one, in order
to eliminate the original design drawbacks. Integration of new bucket
wheel drive solution requires a subtle redesign of the bucket wheel boom.
Calculation verification of bucket wheel boom structure is realized on
basis of comparative stress analysis of the original and redesigned
construction. Sixteen different load cases were analyzed. Results of finite
element analysis are presented in this paper. Presented redesign solution
makes the installation of new bucket wheel drive possible, maintenance
process easier and prolongs the service life of the machine.
PB  - University of Belgrade, Faculty of Mechanical Engineering
C3  - Proceedings of the XX International Conference MHCL’12
T1  - Redesign of the BWE SchRs 350 bucket wheel boom
EP  - 154
SP  - 149
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4905
ER  - 

@conference{
author = "Petković, Zoran D. and Bošnjak, Srđan and Gnjatović, Nebojša and Mihajlović, Vaso M. and Milojević, Goran",
year = "2012",
abstract = "Bucket wheel excavator SchRs 350/5x12 is one of the oldest mining
machines still operating in open pit mines in Serbia. Bucket wheel drive
gearbox of classical type had to be substituted with planetary one, in order
to eliminate the original design drawbacks. Integration of new bucket
wheel drive solution requires a subtle redesign of the bucket wheel boom.
Calculation verification of bucket wheel boom structure is realized on
basis of comparative stress analysis of the original and redesigned
construction. Sixteen different load cases were analyzed. Results of finite
element analysis are presented in this paper. Presented redesign solution
makes the installation of new bucket wheel drive possible, maintenance
process easier and prolongs the service life of the machine.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "Proceedings of the XX International Conference MHCL’12",
title = "Redesign of the BWE SchRs 350 bucket wheel boom",
pages = "154-149",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4905"
}

Petković, Z. D., Bošnjak, S., Gnjatović, N., Mihajlović, V. M.,& Milojević, G.. (2012). Redesign of the BWE SchRs 350 bucket wheel boom. in Proceedings of the XX International Conference MHCL’12
University of Belgrade, Faculty of Mechanical Engineering., 149-154.
https://hdl.handle.net/21.15107/rcub_machinery_4905

Petković ZD, Bošnjak S, Gnjatović N, Mihajlović VM, Milojević G. Redesign of the BWE SchRs 350 bucket wheel boom. in Proceedings of the XX International Conference MHCL’12. 2012;:149-154.
https://hdl.handle.net/21.15107/rcub_machinery_4905 .

Petković, Zoran D., Bošnjak, Srđan, Gnjatović, Nebojša, Mihajlović, Vaso M., Milojević, Goran, "Redesign of the BWE SchRs 350 bucket wheel boom" in Proceedings of the XX International Conference MHCL’12 (2012):149-154,
https://hdl.handle.net/21.15107/rcub_machinery_4905 .

TY  - CONF
AU  - Gašić, Vlada
AU  - Zrnić, Nenad
AU  - Petković, Zoran
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4530
AB  - The dynamics of a two-dimensional gantry crane structure subjected to a
moving trolley with hoist and payload is examined. Dynamic responses of
structure, both in vertical (Y) and horizontal direction (X), are postulated
using the combined finite element and analytical method and solved with
the direct integration method. Instead of conventional moving force
problem, the two-dimensional inertial effects due to the overall mass of
trolley, hoist and payload have been considered in this paper. The title
problem was solved by calculating the forced vibration responses of the jib
crane structure with time-dependent overall mass and subjected to an
equivalent moving force. Factors as speed and acceleration of the moving
trolley were studied. Numerical results reveal that used approach is useful
and can draw conclusions for structural design purposes of gantry cranes
and approaches for creation of dynamic models.
PB  - University of Belgrade: Faculty of Mechanical Engineering
C3  - Proceedings of XX International Conference on "Material Handling, Constructions and Logistics" - MHCL 2012
T1  - Dynamic responses of a gantry crane structure due to an accelerating moving mass
EP  - 118
SP  - 113
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4530
ER  - 

@conference{
author = "Gašić, Vlada and Zrnić, Nenad and Petković, Zoran",
year = "2012",
abstract = "The dynamics of a two-dimensional gantry crane structure subjected to a
moving trolley with hoist and payload is examined. Dynamic responses of
structure, both in vertical (Y) and horizontal direction (X), are postulated
using the combined finite element and analytical method and solved with
the direct integration method. Instead of conventional moving force
problem, the two-dimensional inertial effects due to the overall mass of
trolley, hoist and payload have been considered in this paper. The title
problem was solved by calculating the forced vibration responses of the jib
crane structure with time-dependent overall mass and subjected to an
equivalent moving force. Factors as speed and acceleration of the moving
trolley were studied. Numerical results reveal that used approach is useful
and can draw conclusions for structural design purposes of gantry cranes
and approaches for creation of dynamic models.",
publisher = "University of Belgrade: Faculty of Mechanical Engineering",
journal = "Proceedings of XX International Conference on "Material Handling, Constructions and Logistics" - MHCL 2012",
title = "Dynamic responses of a gantry crane structure due to an accelerating moving mass",
pages = "118-113",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4530"
}

Gašić, V., Zrnić, N.,& Petković, Z.. (2012). Dynamic responses of a gantry crane structure due to an accelerating moving mass. in Proceedings of XX International Conference on "Material Handling, Constructions and Logistics" - MHCL 2012
University of Belgrade: Faculty of Mechanical Engineering., 113-118.
https://hdl.handle.net/21.15107/rcub_machinery_4530

Gašić V, Zrnić N, Petković Z. Dynamic responses of a gantry crane structure due to an accelerating moving mass. in Proceedings of XX International Conference on "Material Handling, Constructions and Logistics" - MHCL 2012. 2012;:113-118.
https://hdl.handle.net/21.15107/rcub_machinery_4530 .

Gašić, Vlada, Zrnić, Nenad, Petković, Zoran, "Dynamic responses of a gantry crane structure due to an accelerating moving mass" in Proceedings of XX International Conference on "Material Handling, Constructions and Logistics" - MHCL 2012 (2012):113-118,
https://hdl.handle.net/21.15107/rcub_machinery_4530 .

TY  - GEN
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
AU  - Mihajlović, Vaso M.
AU  - Milojević, Goran
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5271
AB  - Роторни багер SRs 1200x24/4x4+VR (G ‐ 3) био је ангажован на ископу јаловине на „Пољу Д“ РБ Колубара. Дана 06.11. 2012. године дошло је до тешке хаварије машине изазване обрушавањем чела етаже.Суштина техничког решења јесте да се редизајном структуре која је претрпела тешко хаваријско оштећење обезбеди повољнија дистрибуција оптерећења, елиминишу геометријски концентратори напона и оствари повољнија дистрибуција крутости унутар структуре. Осим тога, оштра ограничења током развоја редизајниране структуре представљали су захтеви да се реконструкција обави у теренским условима, без демонтаже подсистема носеће конструкције. Тиме је време извођења реконструкције драстично скраћено и вишеструко су смањени губици изазвани застојем машине, односно, целокупног БТО система.
PB  - University of Belgrade, Faculty of Mechanical Engineering
T2  - ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84)
T1  - Редизајн обртне платформе роторног багера SRs 1200
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5271
ER  - 

@misc{
author = "Bošnjak, Srđan and Petković, Zoran D. and Gnjatović, Nebojša and Milenović, Ivan Lj. and Mihajlović, Vaso M. and Milojević, Goran",
year = "2012",
abstract = "Роторни багер SRs 1200x24/4x4+VR (G ‐ 3) био је ангажован на ископу јаловине на „Пољу Д“ РБ Колубара. Дана 06.11. 2012. године дошло је до тешке хаварије машине изазване обрушавањем чела етаже.Суштина техничког решења јесте да се редизајном структуре која је претрпела тешко хаваријско оштећење обезбеди повољнија дистрибуција оптерећења, елиминишу геометријски концентратори напона и оствари повољнија дистрибуција крутости унутар структуре. Осим тога, оштра ограничења током развоја редизајниране структуре представљали су захтеви да се реконструкција обави у теренским условима, без демонтаже подсистема носеће конструкције. Тиме је време извођења реконструкције драстично скраћено и вишеструко су смањени губици изазвани застојем машине, односно, целокупног БТО система.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84)",
title = "Редизајн обртне платформе роторног багера SRs 1200",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5271"
}

Bošnjak, S., Petković, Z. D., Gnjatović, N., Milenović, I. Lj., Mihajlović, V. M.,& Milojević, G.. (2012). Редизајн обртне платформе роторног багера SRs 1200. in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84)
University of Belgrade, Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_5271

Bošnjak S, Petković ZD, Gnjatović N, Milenović IL, Mihajlović VM, Milojević G. Редизајн обртне платформе роторног багера SRs 1200. in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84). 2012;.
https://hdl.handle.net/21.15107/rcub_machinery_5271 .

Bošnjak, Srđan, Petković, Zoran D., Gnjatović, Nebojša, Milenović, Ivan Lj., Mihajlović, Vaso M., Milojević, Goran, "Редизајн обртне платформе роторног багера SRs 1200" in ТЕХНИЧКО РЕШЕЊЕ (КАТЕГОРИЈА М84) (2012),
https://hdl.handle.net/21.15107/rcub_machinery_5271 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Dunjić, Momčilo
AU  - Gnjatović, Nebojša
AU  - Đorđević, Miloš
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1465
AB  - As it is widely known, there are three basic reasons for the bucket wheel excavators subsystems redesign: (1) better customization of the machine versus operating conditions; (2) easier maintenance and (3) failure of the substructure under consideration. The improved design solution of the excavating device, outlined in this paper, was developed to satisfy the first and second reason, while the redesigned bucket wheel boom hoisting system satisfies the third. Thanks to the mentioned redesigns, partial revitalizations of the bucket wheel excavators are realised, leading to considerable increase of the machine's reliability as well as the reliability of the complete surface mining system and, additionally, making the maintenance process easier.
T2  - Technics Technologies Education Management
T1  - Redesign of the vital subsystems as a way of extending the bucket wheel excavators life
EP  - 1629
IS  - 4
SP  - 1620
VL  - 7
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1465
ER  - 

@article{
author = "Bošnjak, Srđan and Petković, Zoran D. and Dunjić, Momčilo and Gnjatović, Nebojša and Đorđević, Miloš",
year = "2012",
abstract = "As it is widely known, there are three basic reasons for the bucket wheel excavators subsystems redesign: (1) better customization of the machine versus operating conditions; (2) easier maintenance and (3) failure of the substructure under consideration. The improved design solution of the excavating device, outlined in this paper, was developed to satisfy the first and second reason, while the redesigned bucket wheel boom hoisting system satisfies the third. Thanks to the mentioned redesigns, partial revitalizations of the bucket wheel excavators are realised, leading to considerable increase of the machine's reliability as well as the reliability of the complete surface mining system and, additionally, making the maintenance process easier.",
journal = "Technics Technologies Education Management",
title = "Redesign of the vital subsystems as a way of extending the bucket wheel excavators life",
pages = "1629-1620",
number = "4",
volume = "7",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1465"
}

Bošnjak, S., Petković, Z. D., Dunjić, M., Gnjatović, N.,& Đorđević, M.. (2012). Redesign of the vital subsystems as a way of extending the bucket wheel excavators life. in Technics Technologies Education Management, 7(4), 1620-1629.
https://hdl.handle.net/21.15107/rcub_machinery_1465

Bošnjak S, Petković ZD, Dunjić M, Gnjatović N, Đorđević M. Redesign of the vital subsystems as a way of extending the bucket wheel excavators life. in Technics Technologies Education Management. 2012;7(4):1620-1629.
https://hdl.handle.net/21.15107/rcub_machinery_1465 .

Bošnjak, Srđan, Petković, Zoran D., Dunjić, Momčilo, Gnjatović, Nebojša, Đorđević, Miloš, "Redesign of the vital subsystems as a way of extending the bucket wheel excavators life" in Technics Technologies Education Management, 7, no. 4 (2012):1620-1629,
https://hdl.handle.net/21.15107/rcub_machinery_1465 .

TY  - CONF
AU  - Zrnić, Nenad
AU  - Bošnjak, Srđan
AU  - Gašić, Vlada
AU  - Arsić, Miodrag A.
AU  - Petković, Zoran D.
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1172
AB  - Failures of the cranes' structural parts unavoidably lead to serious damages or total collapses; these accidents are often followed by very high financial losses and possibly serious injuries or crane-related fatalities. The objective of this research was to identify the causes that led to the failure of the hammerhead tower crane (x1425C) counteijib. The crane is used for assembly works at the hydropower dam. The counteijib collapse resulted from a gusset plate failure and caused such significant damage of the whole crane structure that the crane was dismantled and removed from operation. The study of the accident includes: (1) Identification of the stress-state, where a FEM model is developed to provide a useful tool for studying stress analysis; (2) Laboratory investigations are conducted in order to define the chemical composition and mechanical properties of the material, the tensile properties, hardness, impact toughness, as well as the metallographic analyses. The analysis of the obtained results showed that the principal reasons behind the gusset plate failure originated from design and fabrication faults. The working stress was higher than the allowable one. Also, impact toughness was too low and the fabrication of welds was incorrect.
PB  - Elsevier Science Bv, Amsterdam
C3  - 11th International Conference on The Mechanical Behavior of Materials (ICM11)
T1  - Failure Analysis of the Tower Crane Counterjib
VL  - 10
DO  - 10.1016/j.proeng.2011.04.370
ER  - 

@conference{
author = "Zrnić, Nenad and Bošnjak, Srđan and Gašić, Vlada and Arsić, Miodrag A. and Petković, Zoran D.",
year = "2011",
abstract = "Failures of the cranes' structural parts unavoidably lead to serious damages or total collapses; these accidents are often followed by very high financial losses and possibly serious injuries or crane-related fatalities. The objective of this research was to identify the causes that led to the failure of the hammerhead tower crane (x1425C) counteijib. The crane is used for assembly works at the hydropower dam. The counteijib collapse resulted from a gusset plate failure and caused such significant damage of the whole crane structure that the crane was dismantled and removed from operation. The study of the accident includes: (1) Identification of the stress-state, where a FEM model is developed to provide a useful tool for studying stress analysis; (2) Laboratory investigations are conducted in order to define the chemical composition and mechanical properties of the material, the tensile properties, hardness, impact toughness, as well as the metallographic analyses. The analysis of the obtained results showed that the principal reasons behind the gusset plate failure originated from design and fabrication faults. The working stress was higher than the allowable one. Also, impact toughness was too low and the fabrication of welds was incorrect.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "11th International Conference on The Mechanical Behavior of Materials (ICM11)",
title = "Failure Analysis of the Tower Crane Counterjib",
volume = "10",
doi = "10.1016/j.proeng.2011.04.370"
}

Zrnić, N., Bošnjak, S., Gašić, V., Arsić, M. A.,& Petković, Z. D.. (2011). Failure Analysis of the Tower Crane Counterjib. in 11th International Conference on The Mechanical Behavior of Materials (ICM11)
Elsevier Science Bv, Amsterdam., 10.
https://doi.org/10.1016/j.proeng.2011.04.370

Zrnić N, Bošnjak S, Gašić V, Arsić MA, Petković ZD. Failure Analysis of the Tower Crane Counterjib. in 11th International Conference on The Mechanical Behavior of Materials (ICM11). 2011;10.
doi:10.1016/j.proeng.2011.04.370 .

Zrnić, Nenad, Bošnjak, Srđan, Gašić, Vlada, Arsić, Miodrag A., Petković, Zoran D., "Failure Analysis of the Tower Crane Counterjib" in 11th International Conference on The Mechanical Behavior of Materials (ICM11), 10 (2011),
https://doi.org/10.1016/j.proeng.2011.04.370 . .

TY  - CONF
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Milojević, Goran
AU  - Mihajlović, Vaso M.
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5958
AB  - High capacities and key roles in the technological processes cause the extremely high financial losses in the case of high performance machines failures. This paper presents case studies of bucket wheel excavators, stackers and bucket chain reclaimers failures caused by design – in faults. Besides that, paper gives a redesign solutions which are developed by University of Belgrade – Faculty of Mechanical Engineering.
PB  - Faculty of Mechanical Engineering, Kraljevo
C3  - Proceedings of 7th International Triennial Conference Heavy Machinery „HM 2011“
T1  - The Design – in Faults as a Causes of the High Performance Machines Failures
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5958
ER  - 

@conference{
author = "Bošnjak, Srđan and Petković, Zoran D. and Milojević, Goran and Mihajlović, Vaso M.",
year = "2011",
abstract = "High capacities and key roles in the technological processes cause the extremely high financial losses in the case of high performance machines failures. This paper presents case studies of bucket wheel excavators, stackers and bucket chain reclaimers failures caused by design – in faults. Besides that, paper gives a redesign solutions which are developed by University of Belgrade – Faculty of Mechanical Engineering.",
publisher = "Faculty of Mechanical Engineering, Kraljevo",
journal = "Proceedings of 7th International Triennial Conference Heavy Machinery „HM 2011“",
title = "The Design – in Faults as a Causes of the High Performance Machines Failures",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5958"
}

Bošnjak, S., Petković, Z. D., Milojević, G.,& Mihajlović, V. M.. (2011). The Design – in Faults as a Causes of the High Performance Machines Failures. in Proceedings of 7th International Triennial Conference Heavy Machinery „HM 2011“
Faculty of Mechanical Engineering, Kraljevo..
https://hdl.handle.net/21.15107/rcub_machinery_5958

Bošnjak S, Petković ZD, Milojević G, Mihajlović VM. The Design – in Faults as a Causes of the High Performance Machines Failures. in Proceedings of 7th International Triennial Conference Heavy Machinery „HM 2011“. 2011;.
https://hdl.handle.net/21.15107/rcub_machinery_5958 .

Bošnjak, Srđan, Petković, Zoran D., Milojević, Goran, Mihajlović, Vaso M., "The Design – in Faults as a Causes of the High Performance Machines Failures" in Proceedings of 7th International Triennial Conference Heavy Machinery „HM 2011“ (2011),
https://hdl.handle.net/21.15107/rcub_machinery_5958 .

TY  - CONF
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Mihajlović, Vaso M.
AU  - Milojević, Goran
AU  - Milenović, Ivan Lj.
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5954
AB  - One way of solving the improperly parked cars problem is their towing by means of a special vehicle. Hanging the car and putting it onto that vehicle is realized by a special lifting device. This paper presents some design details of the 5 t lifting capacity device.
PB  - SaTCIP (Scientific and Technical Center for Intellectual Property) Ltd.
C3  - Proceedings of 11th International Conference of Research and Development in Mechanical Industry „RaDMI 2011“
T1  - CAD of the special car lifting device
VL  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5954
ER  - 

@conference{
author = "Bošnjak, Srđan and Petković, Zoran D. and Mihajlović, Vaso M. and Milojević, Goran and Milenović, Ivan Lj.",
year = "2011",
abstract = "One way of solving the improperly parked cars problem is their towing by means of a special vehicle. Hanging the car and putting it onto that vehicle is realized by a special lifting device. This paper presents some design details of the 5 t lifting capacity device.",
publisher = "SaTCIP (Scientific and Technical Center for Intellectual Property) Ltd.",
journal = "Proceedings of 11th International Conference of Research and Development in Mechanical Industry „RaDMI 2011“",
title = "CAD of the special car lifting device",
volume = "1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5954"
}

Bošnjak, S., Petković, Z. D., Mihajlović, V. M., Milojević, G.,& Milenović, I. Lj.. (2011). CAD of the special car lifting device. in Proceedings of 11th International Conference of Research and Development in Mechanical Industry „RaDMI 2011“
SaTCIP (Scientific and Technical Center for Intellectual Property) Ltd.., 1.
https://hdl.handle.net/21.15107/rcub_machinery_5954

Bošnjak S, Petković ZD, Mihajlović VM, Milojević G, Milenović IL. CAD of the special car lifting device. in Proceedings of 11th International Conference of Research and Development in Mechanical Industry „RaDMI 2011“. 2011;1.
https://hdl.handle.net/21.15107/rcub_machinery_5954 .

Bošnjak, Srđan, Petković, Zoran D., Mihajlović, Vaso M., Milojević, Goran, Milenović, Ivan Lj., "CAD of the special car lifting device" in Proceedings of 11th International Conference of Research and Development in Mechanical Industry „RaDMI 2011“, 1 (2011),
https://hdl.handle.net/21.15107/rcub_machinery_5954 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Đorđević, Miloš
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1246
AB  - U radu su prezentirana tri tehnička rešenja nastala tokom realizacije projekta iz programa tehnološkog razvoja. Dva tehnička rešenja predstavljaju unapređenja postojećih mašina - redizajn dvotočkovnih kolica guseničnog kretača i obrtne platforme rotornih bagera. Njihovom primenom omogućen je pouzdan rad sistema površinske eksploatacije. Treće tehničko rešenje predstavlja nov proizvod - sistem mehanizacije bočnog navoza brodogradilišta rečno - morskih brodova, čije performanse gotovo dvostruko prevazilaze performanse koje se u referentnoj literaturi navode kao granične. Izgradnja brodogradilišta 'Bomex 4M' i realizacija originalnih rešenja sistema za vuču kolica, značajno je proširila izvozne mogućnosti naše zemlje kada je reč o brodogradnji. .
AB  - This paper presents three technical solutions that have emerged during the realization of the project from the technological development program. Two of these solutions are in fact improvements to the existing machines - the redesign of the crawler two wheel bogie and the slewing platform of the bucket wheel excavator. The application of these solutions enabled safe operation of the surface mining system. The third technical solution is a new product: high - performance mechanized side slipway for river, sea and oversea ships, the performances of which exceed almost doubly those listed as limit ones in the referenced literature. The construction of the 'Bomex 4M' shipyard and the realization of the transport system's original design, significantly raised our country's export possibilities when it comes to shipbuilding. .
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Tehnička rešenja kao fundamentalni rezultati projekta iz programa tehnološkog razvoja
T1  - Technical solutions as fundamental results of the project from the technological development program
EP  - 74
IS  - 1
SP  - 67
VL  - 66
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1246
ER  - 

@article{
author = "Bošnjak, Srđan and Petković, Zoran D. and Đorđević, Miloš",
year = "2011",
abstract = "U radu su prezentirana tri tehnička rešenja nastala tokom realizacije projekta iz programa tehnološkog razvoja. Dva tehnička rešenja predstavljaju unapređenja postojećih mašina - redizajn dvotočkovnih kolica guseničnog kretača i obrtne platforme rotornih bagera. Njihovom primenom omogućen je pouzdan rad sistema površinske eksploatacije. Treće tehničko rešenje predstavlja nov proizvod - sistem mehanizacije bočnog navoza brodogradilišta rečno - morskih brodova, čije performanse gotovo dvostruko prevazilaze performanse koje se u referentnoj literaturi navode kao granične. Izgradnja brodogradilišta 'Bomex 4M' i realizacija originalnih rešenja sistema za vuču kolica, značajno je proširila izvozne mogućnosti naše zemlje kada je reč o brodogradnji. ., This paper presents three technical solutions that have emerged during the realization of the project from the technological development program. Two of these solutions are in fact improvements to the existing machines - the redesign of the crawler two wheel bogie and the slewing platform of the bucket wheel excavator. The application of these solutions enabled safe operation of the surface mining system. The third technical solution is a new product: high - performance mechanized side slipway for river, sea and oversea ships, the performances of which exceed almost doubly those listed as limit ones in the referenced literature. The construction of the 'Bomex 4M' shipyard and the realization of the transport system's original design, significantly raised our country's export possibilities when it comes to shipbuilding. .",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Tehnička rešenja kao fundamentalni rezultati projekta iz programa tehnološkog razvoja, Technical solutions as fundamental results of the project from the technological development program",
pages = "74-67",
number = "1",
volume = "66",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1246"
}

Bošnjak, S., Petković, Z. D.,& Đorđević, M.. (2011). Tehnička rešenja kao fundamentalni rezultati projekta iz programa tehnološkog razvoja. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 66(1), 67-74.
https://hdl.handle.net/21.15107/rcub_machinery_1246

Bošnjak S, Petković ZD, Đorđević M. Tehnička rešenja kao fundamentalni rezultati projekta iz programa tehnološkog razvoja. in Tehnika. 2011;66(1):67-74.
https://hdl.handle.net/21.15107/rcub_machinery_1246 .

Bošnjak, Srđan, Petković, Zoran D., Đorđević, Miloš, "Tehnička rešenja kao fundamentalni rezultati projekta iz programa tehnološkog razvoja" in Tehnika, 66, no. 1 (2011):67-74,
https://hdl.handle.net/21.15107/rcub_machinery_1246 .

TY  - JOUR
AU  - Petković, Zoran D.
AU  - Bošnjak, Srđan
AU  - Gašić, Vlada
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1184
AB  - Design flaws in the positioning of the tribune supporting structures inside the Belgrade Arena hall prevented adequate usage of internal logistic capabilities. This paper deals with a performed redesign of the tribune supporting structure which resolved the flaws and enabled full functionality of the hall while adhering to safety regulations. Besides FEA, the validation of the tribune structure redesign is also confirmed by a multi-year failure-free tribune usage after the reconstruction. .
PB  - Univerzitet u Novom Sadu - Fakultet tehničkih nauka, Novi Sad
T2  - Machine Design
T1  - Redesign of the tribune structure in the Belgrade arena hall
EP  - 46
IS  - 1
SP  - 41
VL  - 3
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1184
ER  - 

@article{
author = "Petković, Zoran D. and Bošnjak, Srđan and Gašić, Vlada",
year = "2011",
abstract = "Design flaws in the positioning of the tribune supporting structures inside the Belgrade Arena hall prevented adequate usage of internal logistic capabilities. This paper deals with a performed redesign of the tribune supporting structure which resolved the flaws and enabled full functionality of the hall while adhering to safety regulations. Besides FEA, the validation of the tribune structure redesign is also confirmed by a multi-year failure-free tribune usage after the reconstruction. .",
publisher = "Univerzitet u Novom Sadu - Fakultet tehničkih nauka, Novi Sad",
journal = "Machine Design",
title = "Redesign of the tribune structure in the Belgrade arena hall",
pages = "46-41",
number = "1",
volume = "3",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1184"
}

Petković, Z. D., Bošnjak, S.,& Gašić, V.. (2011). Redesign of the tribune structure in the Belgrade arena hall. in Machine Design
Univerzitet u Novom Sadu - Fakultet tehničkih nauka, Novi Sad., 3(1), 41-46.
https://hdl.handle.net/21.15107/rcub_machinery_1184

Petković ZD, Bošnjak S, Gašić V. Redesign of the tribune structure in the Belgrade arena hall. in Machine Design. 2011;3(1):41-46.
https://hdl.handle.net/21.15107/rcub_machinery_1184 .

Petković, Zoran D., Bošnjak, Srđan, Gašić, Vlada, "Redesign of the tribune structure in the Belgrade arena hall" in Machine Design, 3, no. 1 (2011):41-46,
https://hdl.handle.net/21.15107/rcub_machinery_1184 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Zrnić, Nenad
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1185
AB  - Bucket wheel boom (BWB) hoisting systems are the vital parts of the bucket wheel excavators (BWE). Failures of the mentioned systems are inevitably cause the BWE collapse followed by a very huge financial loss. This paper discusses the results of the investigation of the stress states of the BWB hoisting system connecting eye-plate. The redesign solution for the connecting eye-plate reconstruction has been chosen based on the comparative stress analysis of alternative solutions. The adopted solution satisfies all design restrictions and strength criterion. Besides that, the stress level is lower for ≈ 20 % compared to the original connecting eye-plate design. After installing the redesigned connecting eye-plates as well as during the operation of the BWE no failures have occurred. .
PB  - Univerzitet u Novom Sadu - Fakultet tehničkih nauka, Novi Sad
T2  - Machine Design
T1  - Improvements of the conveying machinery in thermal power plants: Case studies
EP  - 60
IS  - 1
SP  - 55
VL  - 3
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1185
ER  - 

@article{
author = "Bošnjak, Srđan and Petković, Zoran D. and Zrnić, Nenad",
year = "2011",
abstract = "Bucket wheel boom (BWB) hoisting systems are the vital parts of the bucket wheel excavators (BWE). Failures of the mentioned systems are inevitably cause the BWE collapse followed by a very huge financial loss. This paper discusses the results of the investigation of the stress states of the BWB hoisting system connecting eye-plate. The redesign solution for the connecting eye-plate reconstruction has been chosen based on the comparative stress analysis of alternative solutions. The adopted solution satisfies all design restrictions and strength criterion. Besides that, the stress level is lower for ≈ 20 % compared to the original connecting eye-plate design. After installing the redesigned connecting eye-plates as well as during the operation of the BWE no failures have occurred. .",
publisher = "Univerzitet u Novom Sadu - Fakultet tehničkih nauka, Novi Sad",
journal = "Machine Design",
title = "Improvements of the conveying machinery in thermal power plants: Case studies",
pages = "60-55",
number = "1",
volume = "3",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1185"
}

Bošnjak, S., Petković, Z. D.,& Zrnić, N.. (2011). Improvements of the conveying machinery in thermal power plants: Case studies. in Machine Design
Univerzitet u Novom Sadu - Fakultet tehničkih nauka, Novi Sad., 3(1), 55-60.
https://hdl.handle.net/21.15107/rcub_machinery_1185

Bošnjak S, Petković ZD, Zrnić N. Improvements of the conveying machinery in thermal power plants: Case studies. in Machine Design. 2011;3(1):55-60.
https://hdl.handle.net/21.15107/rcub_machinery_1185 .

Bošnjak, Srđan, Petković, Zoran D., Zrnić, Nenad, "Improvements of the conveying machinery in thermal power plants: Case studies" in Machine Design, 3, no. 1 (2011):55-60,
https://hdl.handle.net/21.15107/rcub_machinery_1185 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Petković, Zoran D.
AU  - Zrnić, Nenad
AU  - Pantelić, Milorad P.
AU  - Obradović, Aleksandar
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1111
AB  - This paper discusses the cause of the failure in the vital part of the crawler travel gear of the bucket wheel excavator (BWE) - two-wheel bogie (TWB). The results of the finite element analysis (FEA) point out that the main reason of the TWB failure is its insufficient strength under lateral forces acting during curve travel. The weak points in the TWB structure are removed by suitable redesign while keeping in mind all restrictions ensuing from installation conditions and functionality of the existing crawler travel gear. In addition to the numerical analysis (FEA), a parallel experimental analysis of the original as well as the redesigned TWB is conducted on a test board especially designed for this purpose. The experimental results have confirmed the considerably improved response on lateral loads of the redesigned TWB. The exploitation of the redesigned TWB with no failures has confirmed the validity of the reconstruction design.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Failure analysis and redesign of the bucket wheel excavator two-wheel bogie
EP  - 485
IS  - 2
SP  - 473
VL  - 17
DO  - 10.1016/j.engfailanal.2009.09.007
ER  - 

@article{
author = "Bošnjak, Srđan and Petković, Zoran D. and Zrnić, Nenad and Pantelić, Milorad P. and Obradović, Aleksandar",
year = "2010",
abstract = "This paper discusses the cause of the failure in the vital part of the crawler travel gear of the bucket wheel excavator (BWE) - two-wheel bogie (TWB). The results of the finite element analysis (FEA) point out that the main reason of the TWB failure is its insufficient strength under lateral forces acting during curve travel. The weak points in the TWB structure are removed by suitable redesign while keeping in mind all restrictions ensuing from installation conditions and functionality of the existing crawler travel gear. In addition to the numerical analysis (FEA), a parallel experimental analysis of the original as well as the redesigned TWB is conducted on a test board especially designed for this purpose. The experimental results have confirmed the considerably improved response on lateral loads of the redesigned TWB. The exploitation of the redesigned TWB with no failures has confirmed the validity of the reconstruction design.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Failure analysis and redesign of the bucket wheel excavator two-wheel bogie",
pages = "485-473",
number = "2",
volume = "17",
doi = "10.1016/j.engfailanal.2009.09.007"
}

Bošnjak, S., Petković, Z. D., Zrnić, N., Pantelić, M. P.,& Obradović, A.. (2010). Failure analysis and redesign of the bucket wheel excavator two-wheel bogie. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 17(2), 473-485.
https://doi.org/10.1016/j.engfailanal.2009.09.007

Bošnjak S, Petković ZD, Zrnić N, Pantelić MP, Obradović A. Failure analysis and redesign of the bucket wheel excavator two-wheel bogie. in Engineering Failure Analysis. 2010;17(2):473-485.
doi:10.1016/j.engfailanal.2009.09.007 .

Bošnjak, Srđan, Petković, Zoran D., Zrnić, Nenad, Pantelić, Milorad P., Obradović, Aleksandar, "Failure analysis and redesign of the bucket wheel excavator two-wheel bogie" in Engineering Failure Analysis, 17, no. 2 (2010):473-485,
https://doi.org/10.1016/j.engfailanal.2009.09.007 . .