TY  - JOUR
AU  - Cerović, Vera B.
AU  - Milković, Dragan
AU  - Grbović, Aleksandar
AU  - Petrović, Dragan
AU  - Simonović, Vojislav
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5265
AB  - Large investments, research efforts and time have been allocated till nowadays for innovation of agricultural tractors and machinery, with the primary aim to increase their productivity, reliability, durability, as well as the environmentally friendly, safe and easy usage. Following this general trend, present work is focused on theoretical analysis of the forces acting on the links of the three-point hitch mechanism. The simulation algorithm and computer code have been developed for calculation of draft forces by two methods (following ASAE D497.4 standard and Goryachkin approach), depending on the three point linkage geometry and mouldboard technical characteristics, and calculation of forces acting on lower and upper links of three-point hitch mechanism. Calculated forces values, based on ASAE draft, exposes smaller differences compared to experimental values, while for the Goryachkin method improvement is possible by entering experimental values for soil resistance coefficient k and coefficient of dynamic resistance s, as we did in this study performing measurements on the aggregate comprehending tractor IMT 539 (IMT Belgrade, Serbia) and two furrow moldboard plough PTO 2.25 (OLT, Osijek, Croatia).
PB  - Ankara Univ, Fac Agr, Diskapi
T2  - Journal of Agricultural Sciences-Tarim Bilimleri Dergisi
T1  - 2D Analytical Model for Evaluation of the Forces in the Three-point Hitch Mechanism
EP  - 281
IS  - 3
SP  - 271
VL  - 26
DO  - 10.15832/ankutbd.493339
ER  - 

@article{
author = "Cerović, Vera B. and Milković, Dragan and Grbović, Aleksandar and Petrović, Dragan and Simonović, Vojislav",
year = "2020",
abstract = "Large investments, research efforts and time have been allocated till nowadays for innovation of agricultural tractors and machinery, with the primary aim to increase their productivity, reliability, durability, as well as the environmentally friendly, safe and easy usage. Following this general trend, present work is focused on theoretical analysis of the forces acting on the links of the three-point hitch mechanism. The simulation algorithm and computer code have been developed for calculation of draft forces by two methods (following ASAE D497.4 standard and Goryachkin approach), depending on the three point linkage geometry and mouldboard technical characteristics, and calculation of forces acting on lower and upper links of three-point hitch mechanism. Calculated forces values, based on ASAE draft, exposes smaller differences compared to experimental values, while for the Goryachkin method improvement is possible by entering experimental values for soil resistance coefficient k and coefficient of dynamic resistance s, as we did in this study performing measurements on the aggregate comprehending tractor IMT 539 (IMT Belgrade, Serbia) and two furrow moldboard plough PTO 2.25 (OLT, Osijek, Croatia).",
publisher = "Ankara Univ, Fac Agr, Diskapi",
journal = "Journal of Agricultural Sciences-Tarim Bilimleri Dergisi",
title = "2D Analytical Model for Evaluation of the Forces in the Three-point Hitch Mechanism",
pages = "281-271",
number = "3",
volume = "26",
doi = "10.15832/ankutbd.493339"
}

Cerović, V. B., Milković, D., Grbović, A., Petrović, D.,& Simonović, V.. (2020). 2D Analytical Model for Evaluation of the Forces in the Three-point Hitch Mechanism. in Journal of Agricultural Sciences-Tarim Bilimleri Dergisi
Ankara Univ, Fac Agr, Diskapi., 26(3), 271-281.
https://doi.org/10.15832/ankutbd.493339

Cerović VB, Milković D, Grbović A, Petrović D, Simonović V. 2D Analytical Model for Evaluation of the Forces in the Three-point Hitch Mechanism. in Journal of Agricultural Sciences-Tarim Bilimleri Dergisi. 2020;26(3):271-281.
doi:10.15832/ankutbd.493339 .

Cerović, Vera B., Milković, Dragan, Grbović, Aleksandar, Petrović, Dragan, Simonović, Vojislav, "2D Analytical Model for Evaluation of the Forces in the Three-point Hitch Mechanism" in Journal of Agricultural Sciences-Tarim Bilimleri Dergisi, 26, no. 3 (2020):271-281,
https://doi.org/10.15832/ankutbd.493339 . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5467
AB  - This paper presents the fifth part of the serie, which presents the graphic designations, i.e. symbols, of the most of standard components of hydraulic systems according to current international standards (ISO). This work is focused to the symbols for simplified presentation on the hydraulic diagrams of the associated components intended for the storage and conditioning of hydraulic oil, and for the storage of energy delivered to the oil as working fluid by hydraulic pumps. The function of oil storage is provided by appropriate hydraulic tanks and the hydraulic energy is stored by means of oil-hydraulic accumulators. Symbols of components for maintaining hydraulic oil operating parameters within optimum limits are also shown. The components also included in this presentation are specified for: purification (oil-hydraulic filters), heating (preheaters/heaters) and cooling (oil-hydraulic coolers).
AB  - Ovaj rad predstavlja peti deo serije u kome su prikazane grafičke oznake (simboli) većine standardnih komponenata hidrauličkih sistema prema važećim međunarodnim tehničkim standardima (ISO). Prikaz je fokusiran na simbole kojima se na hidrauličkim šemama uprošćeno predstavljaju pripadajuće komponente namenjene skladištenju, prečišćavanju i kondicioniranju hidrauličkog ulja, te za skladištenje energije predate hidrauličkom ulju, kao radnoj tečnosti, od strane izvornih organa (hidrauličkih pumpi). Funkciju skladištenja ulja obavljaju hidraulički rezervoari, a hidraulička energija se skladišti pomoću uljno-hidrauličkih akumulatora. Simboli komponenata za održavanje radnih parametara hidrauličkog ulja u optimalnim granicama su takođe prikazani. Obuhvaćene su komponente namenjene: prečišćavanju (uljno-hidraulički filteri), grejanju (predgrejači/grejači) i hlađenju (uljno-hidraulički hladnjaci).
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols: Part five: Auxilliary componets
T1  - Hidraulički simboli - deo V - "Pribor"
EP  - 9
IS  - 1
SP  - 1
VL  - 45
DO  - 10.5937/PoljTeh2001001P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2020",
abstract = "This paper presents the fifth part of the serie, which presents the graphic designations, i.e. symbols, of the most of standard components of hydraulic systems according to current international standards (ISO). This work is focused to the symbols for simplified presentation on the hydraulic diagrams of the associated components intended for the storage and conditioning of hydraulic oil, and for the storage of energy delivered to the oil as working fluid by hydraulic pumps. The function of oil storage is provided by appropriate hydraulic tanks and the hydraulic energy is stored by means of oil-hydraulic accumulators. Symbols of components for maintaining hydraulic oil operating parameters within optimum limits are also shown. The components also included in this presentation are specified for: purification (oil-hydraulic filters), heating (preheaters/heaters) and cooling (oil-hydraulic coolers)., Ovaj rad predstavlja peti deo serije u kome su prikazane grafičke oznake (simboli) većine standardnih komponenata hidrauličkih sistema prema važećim međunarodnim tehničkim standardima (ISO). Prikaz je fokusiran na simbole kojima se na hidrauličkim šemama uprošćeno predstavljaju pripadajuće komponente namenjene skladištenju, prečišćavanju i kondicioniranju hidrauličkog ulja, te za skladištenje energije predate hidrauličkom ulju, kao radnoj tečnosti, od strane izvornih organa (hidrauličkih pumpi). Funkciju skladištenja ulja obavljaju hidraulički rezervoari, a hidraulička energija se skladišti pomoću uljno-hidrauličkih akumulatora. Simboli komponenata za održavanje radnih parametara hidrauličkog ulja u optimalnim granicama su takođe prikazani. Obuhvaćene su komponente namenjene: prečišćavanju (uljno-hidraulički filteri), grejanju (predgrejači/grejači) i hlađenju (uljno-hidraulički hladnjaci).",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols: Part five: Auxilliary componets, Hidraulički simboli - deo V - "Pribor"",
pages = "9-1",
number = "1",
volume = "45",
doi = "10.5937/PoljTeh2001001P"
}

Petrović, D.,& Cerović, V. B.. (2020). Hydraulic symbols: Part five: Auxilliary componets. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 45(1), 1-9.
https://doi.org/10.5937/PoljTeh2001001P

Petrović D, Cerović VB. Hydraulic symbols: Part five: Auxilliary componets. in Poljoprivredna tehnika. 2020;45(1):1-9.
doi:10.5937/PoljTeh2001001P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols: Part five: Auxilliary componets" in Poljoprivredna tehnika, 45, no. 1 (2020):1-9,
https://doi.org/10.5937/PoljTeh2001001P . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5178
AB  - The mechanization of a wide variety of production processes and operations in modern primary agricultural production, transport, storage and the accompanying food processing industry can hardly be accomplished without automation. In most cases, production efficiency and environmental sustainability require, among other things, accurate control of the flow of energy within the installations, work machines, devices and mechanisms used. From the point of view of the theory of automatic control and regulation, the elements of the engaged technique: machines, devices and mechanisms represent the objects of control. The controlled routing and optimal delivery of energy to desired management facilities is, as a rule, very rarely uniform, as it must have correctlyaligned timing with the current variable requirements of the production or operation process, which often change quite unpredictably over the time. The required amount of energy can be transferred to consumers in agriculture through the application of appropriate mechanical, electrical, pneumatic or hydraulic systems, as well as with their combinations. All existing kinds of energy transmission systems have certain advantages and disadvantages, with a common requirement for appropriate controls. In the focus of interest of this paper are the graphic symbols of the directional control valves for hydraulic transmission and control, designated as hydraulic directional control valves, or shorter, the hydraulic distributors.
AB  - Mehanizacija mnogobrojnih proizvodnih procesa i operacija u savremenoj primarnoj poljoprivrednoj proizvodnji, transportu, skladištenju i pratećoj prehrambenoj prerađivačkoj industriji teško se može ostvariti bez automatizacije. U najvećem broju slučajeva, proizvodna efikasnost i ekološka održivost zahtevaju, između ostalog, preciznu kontrolu toka energije u okviru primenjenih instalacija, radnih mašina, uređaja i mehanizmima. Sa gledišta teorije automatskog upravljanja, elementi angažovane tehnike, mašine, uređaji i mehanizmi, mogu predstavljati objekte upravljanja. Kontrolisano usmeravanje i optimalno dostavljanje određene količine energije željenim objektima upravljanja po pravilu je veoma retko uniformno, jer mora biti usklađeno sa vremenski nepredvidivim promenama zahteva proizvodnog procesa ili operacije. Potrebna energija može se preneti prema potrošačima u poljoprivredi primenom odgovarajućih mehaničkih, električnih, pneumatskih ili hidrauličkih sistema, kao i njihovim sadejstvom. Svi postojeći tipovi sistema prenosa energije imaju izvesne prednosti i nedostatke, uz zajednicki zahtev za odgovarajućim upravljačkim elementima. U fokusu ovog rada su grafički simboli upravljačkih ventila hidrauličkog prenosa energije (snage) i upravljačkih signala, označeni kao hidraulički razvodni ventili, ili hidraulički razvodnici.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols - part four: Directional control valves
T1  - Hidraulički simboli - deo IV - razvodni ventili
EP  - 16
IS  - 4
SP  - 1
VL  - 44
DO  - 10.5937/PoljTeh1904001P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2019",
abstract = "The mechanization of a wide variety of production processes and operations in modern primary agricultural production, transport, storage and the accompanying food processing industry can hardly be accomplished without automation. In most cases, production efficiency and environmental sustainability require, among other things, accurate control of the flow of energy within the installations, work machines, devices and mechanisms used. From the point of view of the theory of automatic control and regulation, the elements of the engaged technique: machines, devices and mechanisms represent the objects of control. The controlled routing and optimal delivery of energy to desired management facilities is, as a rule, very rarely uniform, as it must have correctlyaligned timing with the current variable requirements of the production or operation process, which often change quite unpredictably over the time. The required amount of energy can be transferred to consumers in agriculture through the application of appropriate mechanical, electrical, pneumatic or hydraulic systems, as well as with their combinations. All existing kinds of energy transmission systems have certain advantages and disadvantages, with a common requirement for appropriate controls. In the focus of interest of this paper are the graphic symbols of the directional control valves for hydraulic transmission and control, designated as hydraulic directional control valves, or shorter, the hydraulic distributors., Mehanizacija mnogobrojnih proizvodnih procesa i operacija u savremenoj primarnoj poljoprivrednoj proizvodnji, transportu, skladištenju i pratećoj prehrambenoj prerađivačkoj industriji teško se može ostvariti bez automatizacije. U najvećem broju slučajeva, proizvodna efikasnost i ekološka održivost zahtevaju, između ostalog, preciznu kontrolu toka energije u okviru primenjenih instalacija, radnih mašina, uređaja i mehanizmima. Sa gledišta teorije automatskog upravljanja, elementi angažovane tehnike, mašine, uređaji i mehanizmi, mogu predstavljati objekte upravljanja. Kontrolisano usmeravanje i optimalno dostavljanje određene količine energije željenim objektima upravljanja po pravilu je veoma retko uniformno, jer mora biti usklađeno sa vremenski nepredvidivim promenama zahteva proizvodnog procesa ili operacije. Potrebna energija može se preneti prema potrošačima u poljoprivredi primenom odgovarajućih mehaničkih, električnih, pneumatskih ili hidrauličkih sistema, kao i njihovim sadejstvom. Svi postojeći tipovi sistema prenosa energije imaju izvesne prednosti i nedostatke, uz zajednicki zahtev za odgovarajućim upravljačkim elementima. U fokusu ovog rada su grafički simboli upravljačkih ventila hidrauličkog prenosa energije (snage) i upravljačkih signala, označeni kao hidraulički razvodni ventili, ili hidraulički razvodnici.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols - part four: Directional control valves, Hidraulički simboli - deo IV - razvodni ventili",
pages = "16-1",
number = "4",
volume = "44",
doi = "10.5937/PoljTeh1904001P"
}

Petrović, D.,& Cerović, V. B.. (2019). Hydraulic symbols - part four: Directional control valves. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(4), 1-16.
https://doi.org/10.5937/PoljTeh1904001P

Petrović D, Cerović VB. Hydraulic symbols - part four: Directional control valves. in Poljoprivredna tehnika. 2019;44(4):1-16.
doi:10.5937/PoljTeh1904001P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols - part four: Directional control valves" in Poljoprivredna tehnika, 44, no. 4 (2019):1-16,
https://doi.org/10.5937/PoljTeh1904001P . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5202
AB  - Similar to human health, the importance of hydraulics sometimes becomes apparent only in her absence. Images and motives of agricultural workers from the past times and centuries can look attractive only on paintings of arts. In reality, it was a very hard and sometimes quite dangerous job. The introduction of hydraulics in construction of modern farming machines, agriculture is less demanding for all farm workers, but also more efficient, which is of particular importance for providing enough food for the growing world during the 20-th century. Achieving high efficiency, reliability and long service life of these systems requires sophisticated diagnostics and failure repairment, regular maintenance and careful use of each hydraulic system, and this is only possible with a good knowledge of the functional principles of all elements, their connections and the whole system. However, modern hydraulic systems of agricultural machines are often very complicated, and the construction of their components is too complex for detailed graphic representation within the whole corresponding hydraulic installation. Therefore, instead of detailed representation of the components, schematic diagrams are used. This manuscript represents a logical continuation of the first and second parts of the paper, devoted to the general symbols, labels of measuring instruments and indicators (part one), as well as pumps and actuators (part two). The third) part of the paper presents the hydraulic symbols of the system control elements - hydraulic valves. The graphical symbols of these components are defined by ISO standards.
AB  - Slično ljudskom zdravlju, značaj hidraulike ponekad postaje vidljiv samo u njenom odsustvu. Slike i motivi radnika u poljoprivredi iz prošlih vremena i vekova mogu izgledati privlačno samo na umetničkim slikama. U stvarnosti, to je bio veoma naporan i ponekad prilično opasan posao. Uvođenje hidraulike u konstrukcije savremenih poljoprivrednih mašina za poljoprivrednu proizvodnju, učinilo je poljoprivredu fizički manje zahtevnom za radnike, ali i efikasnijom, što je od posebne važnosti za obezbeđenje hrane rastuće svetske populacije tokom XX veka. Postizanje visoke efikasnosti, pouzdanosti i dugog radnog veka ovih sistema zahteva naprednu dijagnostika i otklanjanje kvarova, redovno održavanje i pažljivo korišćenje svakog hidrauličkog sistema, a to je moguće samo uz dobro poznavanje funkcionalnih principa svih elemenata, njihovih veza i sistema u celini. Međutim, savremeni hidraulički sistemi poljoprivrednih mašina često su veoma komplikovani, a konstrukcija njihovih komponenata previše kompeksna za detaljno grafičko predstavljanje u sastavu pripadajuće hidrauličke instalacije. Zato, umesto detaljnog predstavljanja komponenata, koriste se odgovarajući šematski dijagrami. Ovaj tekst predstavlja logičan nastavak prvog i drugog dela rada, posvećenih opštim simbolima, oznakama mernih instrumenata i indikatora (prvi deo), kao i pumpama i izvršnim elementima (drugi deo). Treći deo rada prikazuje hidrauličke simbole elemenata za upravljanje - hidrauličke ventile. Grafičke simboličke oznake upravljačkih komponenata su definisane ISO standardima.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols: Part three: Valves
T1  - Hidraulički simboli - deo III - ventili
EP  - 16
IS  - 3
SP  - 1
VL  - 44
DO  - 10.5937/PoljTeh1903001P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2019",
abstract = "Similar to human health, the importance of hydraulics sometimes becomes apparent only in her absence. Images and motives of agricultural workers from the past times and centuries can look attractive only on paintings of arts. In reality, it was a very hard and sometimes quite dangerous job. The introduction of hydraulics in construction of modern farming machines, agriculture is less demanding for all farm workers, but also more efficient, which is of particular importance for providing enough food for the growing world during the 20-th century. Achieving high efficiency, reliability and long service life of these systems requires sophisticated diagnostics and failure repairment, regular maintenance and careful use of each hydraulic system, and this is only possible with a good knowledge of the functional principles of all elements, their connections and the whole system. However, modern hydraulic systems of agricultural machines are often very complicated, and the construction of their components is too complex for detailed graphic representation within the whole corresponding hydraulic installation. Therefore, instead of detailed representation of the components, schematic diagrams are used. This manuscript represents a logical continuation of the first and second parts of the paper, devoted to the general symbols, labels of measuring instruments and indicators (part one), as well as pumps and actuators (part two). The third) part of the paper presents the hydraulic symbols of the system control elements - hydraulic valves. The graphical symbols of these components are defined by ISO standards., Slično ljudskom zdravlju, značaj hidraulike ponekad postaje vidljiv samo u njenom odsustvu. Slike i motivi radnika u poljoprivredi iz prošlih vremena i vekova mogu izgledati privlačno samo na umetničkim slikama. U stvarnosti, to je bio veoma naporan i ponekad prilično opasan posao. Uvođenje hidraulike u konstrukcije savremenih poljoprivrednih mašina za poljoprivrednu proizvodnju, učinilo je poljoprivredu fizički manje zahtevnom za radnike, ali i efikasnijom, što je od posebne važnosti za obezbeđenje hrane rastuće svetske populacije tokom XX veka. Postizanje visoke efikasnosti, pouzdanosti i dugog radnog veka ovih sistema zahteva naprednu dijagnostika i otklanjanje kvarova, redovno održavanje i pažljivo korišćenje svakog hidrauličkog sistema, a to je moguće samo uz dobro poznavanje funkcionalnih principa svih elemenata, njihovih veza i sistema u celini. Međutim, savremeni hidraulički sistemi poljoprivrednih mašina često su veoma komplikovani, a konstrukcija njihovih komponenata previše kompeksna za detaljno grafičko predstavljanje u sastavu pripadajuće hidrauličke instalacije. Zato, umesto detaljnog predstavljanja komponenata, koriste se odgovarajući šematski dijagrami. Ovaj tekst predstavlja logičan nastavak prvog i drugog dela rada, posvećenih opštim simbolima, oznakama mernih instrumenata i indikatora (prvi deo), kao i pumpama i izvršnim elementima (drugi deo). Treći deo rada prikazuje hidrauličke simbole elemenata za upravljanje - hidrauličke ventile. Grafičke simboličke oznake upravljačkih komponenata su definisane ISO standardima.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols: Part three: Valves, Hidraulički simboli - deo III - ventili",
pages = "16-1",
number = "3",
volume = "44",
doi = "10.5937/PoljTeh1903001P"
}

Petrović, D.,& Cerović, V. B.. (2019). Hydraulic symbols: Part three: Valves. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(3), 1-16.
https://doi.org/10.5937/PoljTeh1903001P

Petrović D, Cerović VB. Hydraulic symbols: Part three: Valves. in Poljoprivredna tehnika. 2019;44(3):1-16.
doi:10.5937/PoljTeh1903001P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols: Part three: Valves" in Poljoprivredna tehnika, 44, no. 3 (2019):1-16,
https://doi.org/10.5937/PoljTeh1903001P . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5216
AB  - Hydraulic power transfer and management systems are widely used in modern agriculture, especially in agricultural engineering and the associated processing industry. They can be very simple, but also extremely complex, when precise matching of the interaction of their components in real time is very difficult to controll and achieve. In addition, the designs of a number of hydraulic components is sufficiently complicated for detailed representation on the corresponding hydraulic installation. In all cases, analyzing the performance characteristics of components and the entire hydraulic system, as well as understanding the structure of the hydraulic system, is of great importance. One of the generally accepted ways to facilitate and speed up these processes is the application of schematic diagrams of hydraulic systems and their subcircuits. Officially, hydraulic symbols are defined by ISO industry standards. Therefore, ideally, all hydraulic schemes should be configured using universal graphic symbols. Unfortunately, this is not always the case in technical practice. Depending on the manufacturer and/or dealer of the hydraulic equipment, the symbols of the associated schemes vary in a smaller or a greater extent. The real reasons for the existence of these differences can only be assumed. According to some authors, companies want their drawings to differ from the hydraulic schema of competitors. Therefore, the most commonly used hydraulic symbols are presented in this paper.
AB  - Hidraulički sistemi prenosa snage i upravljanja široko su zastupljeni u savremenoj poljoprivredi, a posebno u poljoprivrednoj tehnici i pratećoj prerađivačkoj industriji. Mogu biti veoma jednostavni, ali i izuzetno složeni, kada je precizno usklađivanje međusobnih interakcija njihovih komponenata u realnom vremenu veoma otežano. Pored toga, konstrukcija velikog broja hidrauličkih komponenata je dovoljno komplikovana za detaljno predstavljanje u sklopu pripadajuće hidrauličke instalacije. U svim slučajevima, analizanje radnih karakteristika komponenata i celokupnog hidrauličkog sistema, kao i razumevanje strukture hidrauličkog sistema, od neprocenjivog je značaja. Jedan od opšte prihvaćenih načina za olakšavanje i ubrzavanje ovih procesa je izrada i korišćenje šematskih dijagrama hidrauličkih sistema, kao i strujnih kola (podsistema) od kojih su sastavljeni. Zvanično, simboli hidraulike definisani su ISO industrijskim standardima. Stoga, u idealnom slučaju, sve hidrauličke šeme bi trebale sadržati univerzalne simboličke oznake. To ipak nije uvek slučaj u tehničkoj praksi. U zavisnosti od proizvođača i/ili prodavca hidrauličke opreme, simboli pripadajućih šema se nekada mogu razlikovati u izvesnoj meri. Stvarne razloge postojanja ovih razlika je moguće samo pretpostaviti. Prema nekim autorima, proizvođači i/ili prodavci žele da se njihovi crteži razlikuju od hidrauličkih šema konkurenata. Prema drugima, simboli su dizajnirani da predstave većinu raspoloživih komponenata, ali ipak ne mogu pokriti sve postojeće te se zato formiraju dodatni nestandardni simboli u nekim posebnim situacijama. Zato se neki elementi hidrauličkih instalacija moraju predstavljati kao kombinacije različitih postojećih simbola da bi se pokazalo kao funkcionišu. U ovom radu zato su dominantno prikazani standardni hidraulički simboli, a u ređim slučajevima i neki simboli hidrauličkih komponenata koji se i dalje relativno često sreću na hidrauličkim šemama u praksi.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators
T1  - Hidraulički simboli - deo I - opšti simboli i oznake mernih instrumenata i indikatora
EP  - 56
IS  - 1
SP  - 45
VL  - 44
DO  - 10.5937/PoljTeh1901045P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2019",
abstract = "Hydraulic power transfer and management systems are widely used in modern agriculture, especially in agricultural engineering and the associated processing industry. They can be very simple, but also extremely complex, when precise matching of the interaction of their components in real time is very difficult to controll and achieve. In addition, the designs of a number of hydraulic components is sufficiently complicated for detailed representation on the corresponding hydraulic installation. In all cases, analyzing the performance characteristics of components and the entire hydraulic system, as well as understanding the structure of the hydraulic system, is of great importance. One of the generally accepted ways to facilitate and speed up these processes is the application of schematic diagrams of hydraulic systems and their subcircuits. Officially, hydraulic symbols are defined by ISO industry standards. Therefore, ideally, all hydraulic schemes should be configured using universal graphic symbols. Unfortunately, this is not always the case in technical practice. Depending on the manufacturer and/or dealer of the hydraulic equipment, the symbols of the associated schemes vary in a smaller or a greater extent. The real reasons for the existence of these differences can only be assumed. According to some authors, companies want their drawings to differ from the hydraulic schema of competitors. Therefore, the most commonly used hydraulic symbols are presented in this paper., Hidraulički sistemi prenosa snage i upravljanja široko su zastupljeni u savremenoj poljoprivredi, a posebno u poljoprivrednoj tehnici i pratećoj prerađivačkoj industriji. Mogu biti veoma jednostavni, ali i izuzetno složeni, kada je precizno usklađivanje međusobnih interakcija njihovih komponenata u realnom vremenu veoma otežano. Pored toga, konstrukcija velikog broja hidrauličkih komponenata je dovoljno komplikovana za detaljno predstavljanje u sklopu pripadajuće hidrauličke instalacije. U svim slučajevima, analizanje radnih karakteristika komponenata i celokupnog hidrauličkog sistema, kao i razumevanje strukture hidrauličkog sistema, od neprocenjivog je značaja. Jedan od opšte prihvaćenih načina za olakšavanje i ubrzavanje ovih procesa je izrada i korišćenje šematskih dijagrama hidrauličkih sistema, kao i strujnih kola (podsistema) od kojih su sastavljeni. Zvanično, simboli hidraulike definisani su ISO industrijskim standardima. Stoga, u idealnom slučaju, sve hidrauličke šeme bi trebale sadržati univerzalne simboličke oznake. To ipak nije uvek slučaj u tehničkoj praksi. U zavisnosti od proizvođača i/ili prodavca hidrauličke opreme, simboli pripadajućih šema se nekada mogu razlikovati u izvesnoj meri. Stvarne razloge postojanja ovih razlika je moguće samo pretpostaviti. Prema nekim autorima, proizvođači i/ili prodavci žele da se njihovi crteži razlikuju od hidrauličkih šema konkurenata. Prema drugima, simboli su dizajnirani da predstave većinu raspoloživih komponenata, ali ipak ne mogu pokriti sve postojeće te se zato formiraju dodatni nestandardni simboli u nekim posebnim situacijama. Zato se neki elementi hidrauličkih instalacija moraju predstavljati kao kombinacije različitih postojećih simbola da bi se pokazalo kao funkcionišu. U ovom radu zato su dominantno prikazani standardni hidraulički simboli, a u ređim slučajevima i neki simboli hidrauličkih komponenata koji se i dalje relativno često sreću na hidrauličkim šemama u praksi.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators, Hidraulički simboli - deo I - opšti simboli i oznake mernih instrumenata i indikatora",
pages = "56-45",
number = "1",
volume = "44",
doi = "10.5937/PoljTeh1901045P"
}

Petrović, D.,& Cerović, V. B.. (2019). Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(1), 45-56.
https://doi.org/10.5937/PoljTeh1901045P

Petrović D, Cerović VB. Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators. in Poljoprivredna tehnika. 2019;44(1):45-56.
doi:10.5937/PoljTeh1901045P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators" in Poljoprivredna tehnika, 44, no. 1 (2019):45-56,
https://doi.org/10.5937/PoljTeh1901045P . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5219
AB  - At the current level of technological development, it is widely accepted that survival and progress of modern agricultural technology (among other things) is based on the widespread application of electronically controlled hydraulic systems, supported by mechanical elements of power transmission and control. This paper is a logical continuation of the first part, entitled "Hydraulic symbols - part I: general symbols and designations of measuring instruments and indicators". Therefore, the current second part of the paper is devoted to the presentation and description of hydraulic symbols of pumps and various types of actuators: linear, rotary and oscillatory. Symbols of the combined-function devices, which can optionally function in two different operating modes, such as pumps or motors, are also shown. Standard symbols of all groups of hydraulic components, which are in the focus of this paper, are standardized and defined by ISO industry standards.
AB  - Na sadašnjem nivou tehnološkog razvoja, opšte je prihvaćeno mišljenje da savremena poljoprivredna tehnika, između ostalog, svoj napredak zasniva na širokoj primeni elektronski kontrolisanih hidrauličkih sistema, podržanih mehaničkim elementima prenosa snage i upravljanja. Ovaj rukopis predstavlja logičan nastavak prvog dela rada, pod nazivom "Hidraulički simboli - deo I: opšti simboli i oznake mernih instrumenata i indikatora", posvećenog pripadajućoj tematici. Zato je drugi deo rada posvećen prikazu i opisu hidrauličkih simbola pumpi i različitih tipova izvršnih hidrauličkih organa i to: linearnih, rotacionih i oscilatornih. Takođe su predstavljeni i simboli uređaja kombinovane namene, koji opciono mogu funkcionisati u dva različita radna režima, kao hidrauličke pumpe ili hidraulički motori. Simboli svih grupa hidrauličkih komponenata, koje su u fokusu ovog rada, standardizovani su i definisani ISO industrijskim standardima.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols - Part Two: Pumps and actuators
T1  - Hidraulički simboli - deo II - pumpe i izvršni organi
EP  - 12
IS  - 2
SP  - 1
VL  - 44
DO  - 10.5937/PoljTeh1902001P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2019",
abstract = "At the current level of technological development, it is widely accepted that survival and progress of modern agricultural technology (among other things) is based on the widespread application of electronically controlled hydraulic systems, supported by mechanical elements of power transmission and control. This paper is a logical continuation of the first part, entitled "Hydraulic symbols - part I: general symbols and designations of measuring instruments and indicators". Therefore, the current second part of the paper is devoted to the presentation and description of hydraulic symbols of pumps and various types of actuators: linear, rotary and oscillatory. Symbols of the combined-function devices, which can optionally function in two different operating modes, such as pumps or motors, are also shown. Standard symbols of all groups of hydraulic components, which are in the focus of this paper, are standardized and defined by ISO industry standards., Na sadašnjem nivou tehnološkog razvoja, opšte je prihvaćeno mišljenje da savremena poljoprivredna tehnika, između ostalog, svoj napredak zasniva na širokoj primeni elektronski kontrolisanih hidrauličkih sistema, podržanih mehaničkim elementima prenosa snage i upravljanja. Ovaj rukopis predstavlja logičan nastavak prvog dela rada, pod nazivom "Hidraulički simboli - deo I: opšti simboli i oznake mernih instrumenata i indikatora", posvećenog pripadajućoj tematici. Zato je drugi deo rada posvećen prikazu i opisu hidrauličkih simbola pumpi i različitih tipova izvršnih hidrauličkih organa i to: linearnih, rotacionih i oscilatornih. Takođe su predstavljeni i simboli uređaja kombinovane namene, koji opciono mogu funkcionisati u dva različita radna režima, kao hidrauličke pumpe ili hidraulički motori. Simboli svih grupa hidrauličkih komponenata, koje su u fokusu ovog rada, standardizovani su i definisani ISO industrijskim standardima.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols - Part Two: Pumps and actuators, Hidraulički simboli - deo II - pumpe i izvršni organi",
pages = "12-1",
number = "2",
volume = "44",
doi = "10.5937/PoljTeh1902001P"
}

Petrović, D.,& Cerović, V. B.. (2019). Hydraulic symbols - Part Two: Pumps and actuators. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(2), 1-12.
https://doi.org/10.5937/PoljTeh1902001P

Petrović D, Cerović VB. Hydraulic symbols - Part Two: Pumps and actuators. in Poljoprivredna tehnika. 2019;44(2):1-12.
doi:10.5937/PoljTeh1902001P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols - Part Two: Pumps and actuators" in Poljoprivredna tehnika, 44, no. 2 (2019):1-12,
https://doi.org/10.5937/PoljTeh1902001P . .

TY  - JOUR
AU  - Cerović, Vera B.
AU  - Petrović, Dragan
AU  - Radojević, Rade
AU  - Barać, Saša
AU  - Vuković, Aleksandar
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4833
AB  - At present, spreading of mineral fertilizers in Europe is most commonly performed using centrifugal disk spreaders with attached vanes. The motion of an ideal spherical homogeneous fertilizer particle along the straight vane attached to a flat rotating disc was analyzed in this paper. The analysis was performed in the non-inertial reference coordinate system. From the assumptions introduced to enable analytical describing of the real particle motion as well as the general tools of solid mechanics, the ordinary in-homogenous second-order differential equation having constant coefficients arose. Its solution represents an approximation of the real relative motion of the fertilizer particle along the straight radial vane fixed to the flat horizontal disc rotating at a constant angular velocity. However, the solution of this kind can be very useful for the optimization of centrifugal spreader working parameters.
AB  - U Evropi se za rasipanje granularnog mineralnog đubriva najčešće koriste centrifugalni rasipači sa lopaticama. U ovom radu je analizirano kretanje idealne, loptaste, homogene granule đubriva duž lopatica postavljenih po rotirajućem disku. Analiza je izvedena primenom neinercijalnog referentnog koordinatnog sistema. Uvođenjem određenih pretpostavki i primenom zakona teorijske mehanike za opisivanje kretanja čestice, formirana je nehomogena diferencijalna jednačina drugog reda sa konstantnim koeficijentima. Njeno rešenje aproksimira realno relativno kretanje čestice đubriva duž ravnih radijalnih lopatica pričvršćenih za horizontalni disk, koji se obrće konstantnom ugaonom brzinom. Dobijeno rešenje se svakako može koristiti za optimizaciju radnih parametara centrifugalnog rasipača sa diskom.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd
T2  - Journal of Agricultural Sciences (Belgrade)
T1  - On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle
T1  - Kretanje čestice đubriva duž lopatice centrifugalnog rasipača sa diskom pretpostavljajući čisto klizanje čestice
EP  - 97
IS  - 1
SP  - 83
VL  - 63
DO  - 10.2298/JAS1801083C
ER  - 

@article{
author = "Cerović, Vera B. and Petrović, Dragan and Radojević, Rade and Barać, Saša and Vuković, Aleksandar",
year = "2018",
abstract = "At present, spreading of mineral fertilizers in Europe is most commonly performed using centrifugal disk spreaders with attached vanes. The motion of an ideal spherical homogeneous fertilizer particle along the straight vane attached to a flat rotating disc was analyzed in this paper. The analysis was performed in the non-inertial reference coordinate system. From the assumptions introduced to enable analytical describing of the real particle motion as well as the general tools of solid mechanics, the ordinary in-homogenous second-order differential equation having constant coefficients arose. Its solution represents an approximation of the real relative motion of the fertilizer particle along the straight radial vane fixed to the flat horizontal disc rotating at a constant angular velocity. However, the solution of this kind can be very useful for the optimization of centrifugal spreader working parameters., U Evropi se za rasipanje granularnog mineralnog đubriva najčešće koriste centrifugalni rasipači sa lopaticama. U ovom radu je analizirano kretanje idealne, loptaste, homogene granule đubriva duž lopatica postavljenih po rotirajućem disku. Analiza je izvedena primenom neinercijalnog referentnog koordinatnog sistema. Uvođenjem određenih pretpostavki i primenom zakona teorijske mehanike za opisivanje kretanja čestice, formirana je nehomogena diferencijalna jednačina drugog reda sa konstantnim koeficijentima. Njeno rešenje aproksimira realno relativno kretanje čestice đubriva duž ravnih radijalnih lopatica pričvršćenih za horizontalni disk, koji se obrće konstantnom ugaonom brzinom. Dobijeno rešenje se svakako može koristiti za optimizaciju radnih parametara centrifugalnog rasipača sa diskom.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd",
journal = "Journal of Agricultural Sciences (Belgrade)",
title = "On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle, Kretanje čestice đubriva duž lopatice centrifugalnog rasipača sa diskom pretpostavljajući čisto klizanje čestice",
pages = "97-83",
number = "1",
volume = "63",
doi = "10.2298/JAS1801083C"
}

Cerović, V. B., Petrović, D., Radojević, R., Barać, S.,& Vuković, A.. (2018). On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle. in Journal of Agricultural Sciences (Belgrade)
Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd., 63(1), 83-97.
https://doi.org/10.2298/JAS1801083C

Cerović VB, Petrović D, Radojević R, Barać S, Vuković A. On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle. in Journal of Agricultural Sciences (Belgrade). 2018;63(1):83-97.
doi:10.2298/JAS1801083C .

Cerović, Vera B., Petrović, Dragan, Radojević, Rade, Barać, Saša, Vuković, Aleksandar, "On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle" in Journal of Agricultural Sciences (Belgrade), 63, no. 1 (2018):83-97,
https://doi.org/10.2298/JAS1801083C . .

TY  - JOUR
AU  - Mileusnić, Zoran
AU  - Radojević, Rade
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4867
AB  - The analysis of the factors that show decisive influence on the tractors stability and the possible overturning, should preventively indicate the possible improvements of the tractor construction, in order to increase the tractor's and operator's safety. The purpose of this paper is to check the static angles of the longitudinal and lateral tractor stability, using the different methods that check the tractor stability up to the to the turnover limit. The process is based on the tractor longitudinal and lateral tilting and measurement of the reference values of the wheels heights with respect to the base. The same angles can be obtained by various analytical and numerical methods based on the Theoretical mechanics. This paper suggests on the importance of empirical data, because they are the basis for further stability analysis of the tractors, other self-propelled agricultural machines.
AB  - Analiza faktora koji pokazuju odlučujuće uticaje na stabilnost i moguća prevrtanja traktora treba preventivno da ukaže na područja njihove efiksne i sigurne primene, kao i na glavne pravce poboljšanja konstrukcije traktora radi povećanja bezbednosti traktora i rukovaoca. Cilj ovog rada predstavlja provera statičkih uglova podužne i poprečne stabilnosti traktora, primenom različitih pristupa, tako što se isti dovodi do granice prevrtanja. Sam proces se zasniva na podužnom i bočnom podizanju traktora, uz stalno merenje referentnih vrednosti kota oslonih tačaka točkova u odnosu na podlogu. Isti uglovi se mogu proceniti i primenom analitičkih i numeričkih metoda, zasnovanih na principima teorijske mehanike. Rad ukazuje i na značaj empirijskih podataka, jer su oni osnova za sve dalje analize stabilnosti traktora I drugih samohodnih poljoprivrednih mašina.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - An approach to the wheel tractor static stability analysis
T1  - Pristupi ispitivanju statičke stabilnosti traktora točkaša
EP  - 10
IS  - 2
SP  - 1
VL  - 43
DO  - 10.5937/PoljTeh1802001M
ER  - 

@article{
author = "Mileusnić, Zoran and Radojević, Rade and Petrović, Dragan and Cerović, Vera B.",
year = "2018",
abstract = "The analysis of the factors that show decisive influence on the tractors stability and the possible overturning, should preventively indicate the possible improvements of the tractor construction, in order to increase the tractor's and operator's safety. The purpose of this paper is to check the static angles of the longitudinal and lateral tractor stability, using the different methods that check the tractor stability up to the to the turnover limit. The process is based on the tractor longitudinal and lateral tilting and measurement of the reference values of the wheels heights with respect to the base. The same angles can be obtained by various analytical and numerical methods based on the Theoretical mechanics. This paper suggests on the importance of empirical data, because they are the basis for further stability analysis of the tractors, other self-propelled agricultural machines., Analiza faktora koji pokazuju odlučujuće uticaje na stabilnost i moguća prevrtanja traktora treba preventivno da ukaže na područja njihove efiksne i sigurne primene, kao i na glavne pravce poboljšanja konstrukcije traktora radi povećanja bezbednosti traktora i rukovaoca. Cilj ovog rada predstavlja provera statičkih uglova podužne i poprečne stabilnosti traktora, primenom različitih pristupa, tako što se isti dovodi do granice prevrtanja. Sam proces se zasniva na podužnom i bočnom podizanju traktora, uz stalno merenje referentnih vrednosti kota oslonih tačaka točkova u odnosu na podlogu. Isti uglovi se mogu proceniti i primenom analitičkih i numeričkih metoda, zasnovanih na principima teorijske mehanike. Rad ukazuje i na značaj empirijskih podataka, jer su oni osnova za sve dalje analize stabilnosti traktora I drugih samohodnih poljoprivrednih mašina.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "An approach to the wheel tractor static stability analysis, Pristupi ispitivanju statičke stabilnosti traktora točkaša",
pages = "10-1",
number = "2",
volume = "43",
doi = "10.5937/PoljTeh1802001M"
}

Mileusnić, Z., Radojević, R., Petrović, D.,& Cerović, V. B.. (2018). An approach to the wheel tractor static stability analysis. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 43(2), 1-10.
https://doi.org/10.5937/PoljTeh1802001M

Mileusnić Z, Radojević R, Petrović D, Cerović VB. An approach to the wheel tractor static stability analysis. in Poljoprivredna tehnika. 2018;43(2):1-10.
doi:10.5937/PoljTeh1802001M .

Mileusnić, Zoran, Radojević, Rade, Petrović, Dragan, Cerović, Vera B., "An approach to the wheel tractor static stability analysis" in Poljoprivredna tehnika, 43, no. 2 (2018):1-10,
https://doi.org/10.5937/PoljTeh1802001M . .

TY  - JOUR
AU  - Kurt, Tomantschger
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
AU  - Dimitrijević, Aleksandra
AU  - Radojević, Rade L.
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4875
AB  - The paper analyzes the motion of idealized spherical homogeneous fertilizer particle along the straight vane attached to flat rotating disc. The analysis, based on the assumption on the pure rolling of the particle along the vane (without sliding), has been performed in the non-inertial reference coordinate system, which rotates together with the spreader disk. The particle motion along the vane is described by hyperbolic cosine function, which is the solution of the ordinary in-homogenous secondorder differential equation having constant coefficients. Solution of this kind represents an approximation of the real motion of fertilizer particle along the radial vane fixed to horizontal disc rotating at constant angular velocity. However, it can be very useful for optimization of centrifugal spreader design and working parameters, as well as for further analysis of the whole fertilizer spreading process that also includes particle flight.
AB  - U radu je analizirano kretanje idealizovane, loptaste, homogene čestice mineralnog đubriva duž radijalne lopatice postavljene na rotirajućem disku centrifugalnog rasipača đubriva. Analiza, zasnovana na pretpostavci o kotrljanju čestice duž lopatice bez klizanja, izvedena je u neinercijalnom referentnom koordinatnom sistemu koji rotira zajedno sa diskom za rasipanje đubriva. Kretanje čestice duž lopatice je opisano hiperboličnom kosinusnom funkcijom, koja predstavlja rešenje obične homogene diferencijalne jednačine drugog reda sa konstantnim koeficijentima, koja opisuje dinamiku čestice. Rešenje ove vrste predstavlja aproksimaciju stvarnog kretanja čestice đubriva duž lopatice diska koji rotira konstantnom ugaonom brzinom. Međutim, može biti veoma korisno za optimizaciju dizajna centrifugalnog raspršivača i njegovih radnih parametara, kao i za dalju analizu čitavog procesa rasipanja đubriva koji obuhvata i let čestice u vazduhu po napuštanju lopatice.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling
T1  - Predviđanje kotrljanja čestice đubriva duž lopatice centrifugalnog rasipača sa diskom
EP  - 551
IS  - 4
SP  - 544
VL  - 46
DO  - 10.5937/fmet1804544K
ER  - 

@article{
author = "Kurt, Tomantschger and Petrović, Dragan and Cerović, Vera B. and Dimitrijević, Aleksandra and Radojević, Rade L.",
year = "2018",
abstract = "The paper analyzes the motion of idealized spherical homogeneous fertilizer particle along the straight vane attached to flat rotating disc. The analysis, based on the assumption on the pure rolling of the particle along the vane (without sliding), has been performed in the non-inertial reference coordinate system, which rotates together with the spreader disk. The particle motion along the vane is described by hyperbolic cosine function, which is the solution of the ordinary in-homogenous secondorder differential equation having constant coefficients. Solution of this kind represents an approximation of the real motion of fertilizer particle along the radial vane fixed to horizontal disc rotating at constant angular velocity. However, it can be very useful for optimization of centrifugal spreader design and working parameters, as well as for further analysis of the whole fertilizer spreading process that also includes particle flight., U radu je analizirano kretanje idealizovane, loptaste, homogene čestice mineralnog đubriva duž radijalne lopatice postavljene na rotirajućem disku centrifugalnog rasipača đubriva. Analiza, zasnovana na pretpostavci o kotrljanju čestice duž lopatice bez klizanja, izvedena je u neinercijalnom referentnom koordinatnom sistemu koji rotira zajedno sa diskom za rasipanje đubriva. Kretanje čestice duž lopatice je opisano hiperboličnom kosinusnom funkcijom, koja predstavlja rešenje obične homogene diferencijalne jednačine drugog reda sa konstantnim koeficijentima, koja opisuje dinamiku čestice. Rešenje ove vrste predstavlja aproksimaciju stvarnog kretanja čestice đubriva duž lopatice diska koji rotira konstantnom ugaonom brzinom. Međutim, može biti veoma korisno za optimizaciju dizajna centrifugalnog raspršivača i njegovih radnih parametara, kao i za dalju analizu čitavog procesa rasipanja đubriva koji obuhvata i let čestice u vazduhu po napuštanju lopatice.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling, Predviđanje kotrljanja čestice đubriva duž lopatice centrifugalnog rasipača sa diskom",
pages = "551-544",
number = "4",
volume = "46",
doi = "10.5937/fmet1804544K"
}

Kurt, T., Petrović, D., Cerović, V. B., Dimitrijević, A.,& Radojević, R. L.. (2018). Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 46(4), 544-551.
https://doi.org/10.5937/fmet1804544K

Kurt T, Petrović D, Cerović VB, Dimitrijević A, Radojević RL. Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling. in FME Transactions. 2018;46(4):544-551.
doi:10.5937/fmet1804544K .

Kurt, Tomantschger, Petrović, Dragan, Cerović, Vera B., Dimitrijević, Aleksandra, Radojević, Rade L., "Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling" in FME Transactions, 46, no. 4 (2018):544-551,
https://doi.org/10.5937/fmet1804544K . .

TY  - JOUR
AU  - Cerović, Vera B.
AU  - Petrović, Dragan
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4866
AB  - Modern agricultural engineering involves the wide application of hydraulic and pneumatic systems for the transmission of power (energy) and control signals. This paper presents the most commonly used types of valves in hydraulic systems. In the literature, more classification of hydraulic valves is reported, according to their construction, purposes, etc., which, even within the same classification criteria, sometimes strongly differ one from the another. Therefore, this presentation is organized by principled valve assignment into four basic groups based on purpose, although there are other divisions according to the purpose of the valve. Other classifications, although present in the available literature, have not been commented in detail, due to space constraints. In this manuscript, the basic elements of the construction of the most important types of valves are described and analyzed, their most important characteristics are described, the base functional principles and technical limitations described, and the given guidelines and recommendations for their optimal application.
AB  - Efikasnu, ekonomičnu i samoodrživu savremenu poljoprivrednu tehniku teško je, pored niza drugih agroekoloških, tehničkih ekonomski i drugih zahteva, zamisliti bez širokog uključivanja manuelnih, mehaničkih, hidrauličkih, pneumatskih, električnih, analognih i digitalnih sistema upravljanja, kao i njihovih usklađenih međusobnih aktivnosti vezanih za prenos snage (energije) i upravljačkih signala. U ovom radu su prikazani najčešće korišćeni tipovi ventila u hidrauličkim sistemima. Literatura prikazuje više klasifikacija ventila, prema konstrukciji, nameni itd., pri čemu se čak i isti tip ventila nekada svrstava u različite grupe. Zato su nekada i ventili svrstani u okviru istog klasifikacionog kriterijuma, mogu međusobno značajno razlikovati. Iz navedenih razloga, ovaj prikaz je organizovan principijelnim svrstavanjem ventila u četiri osnovne grupe, prema osnovnim namenama, mada postoje i drugačije podele prema nameni ventila. Ostale klasifikacije, prisutne u dostupnoj literaturi, samo su preliminarno komentarisane. U ovom radu su opisani i analizirani osnovni elementi konstrukcije najvažnijih tipova ventila, navedene njihove najbitnije tehničko-operativne karakteristike, opisani bazni funkcionalni principi i tehnička ograničenja, te date smernice i preporuke za njihovu optimalnu primenu u poljoprivrednoj tehnici.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Control components of hydrostatic and hydraulic systems: The valves
T1  - Ventili kao upravljačke komponente hidrostatičkih sistema
EP  - 25
IS  - 3
SP  - 11
VL  - 43
DO  - 10.5937/PoljTeh1803011C
ER  - 

@article{
author = "Cerović, Vera B. and Petrović, Dragan",
year = "2018",
abstract = "Modern agricultural engineering involves the wide application of hydraulic and pneumatic systems for the transmission of power (energy) and control signals. This paper presents the most commonly used types of valves in hydraulic systems. In the literature, more classification of hydraulic valves is reported, according to their construction, purposes, etc., which, even within the same classification criteria, sometimes strongly differ one from the another. Therefore, this presentation is organized by principled valve assignment into four basic groups based on purpose, although there are other divisions according to the purpose of the valve. Other classifications, although present in the available literature, have not been commented in detail, due to space constraints. In this manuscript, the basic elements of the construction of the most important types of valves are described and analyzed, their most important characteristics are described, the base functional principles and technical limitations described, and the given guidelines and recommendations for their optimal application., Efikasnu, ekonomičnu i samoodrživu savremenu poljoprivrednu tehniku teško je, pored niza drugih agroekoloških, tehničkih ekonomski i drugih zahteva, zamisliti bez širokog uključivanja manuelnih, mehaničkih, hidrauličkih, pneumatskih, električnih, analognih i digitalnih sistema upravljanja, kao i njihovih usklađenih međusobnih aktivnosti vezanih za prenos snage (energije) i upravljačkih signala. U ovom radu su prikazani najčešće korišćeni tipovi ventila u hidrauličkim sistemima. Literatura prikazuje više klasifikacija ventila, prema konstrukciji, nameni itd., pri čemu se čak i isti tip ventila nekada svrstava u različite grupe. Zato su nekada i ventili svrstani u okviru istog klasifikacionog kriterijuma, mogu međusobno značajno razlikovati. Iz navedenih razloga, ovaj prikaz je organizovan principijelnim svrstavanjem ventila u četiri osnovne grupe, prema osnovnim namenama, mada postoje i drugačije podele prema nameni ventila. Ostale klasifikacije, prisutne u dostupnoj literaturi, samo su preliminarno komentarisane. U ovom radu su opisani i analizirani osnovni elementi konstrukcije najvažnijih tipova ventila, navedene njihove najbitnije tehničko-operativne karakteristike, opisani bazni funkcionalni principi i tehnička ograničenja, te date smernice i preporuke za njihovu optimalnu primenu u poljoprivrednoj tehnici.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Control components of hydrostatic and hydraulic systems: The valves, Ventili kao upravljačke komponente hidrostatičkih sistema",
pages = "25-11",
number = "3",
volume = "43",
doi = "10.5937/PoljTeh1803011C"
}

Cerović, V. B.,& Petrović, D.. (2018). Control components of hydrostatic and hydraulic systems: The valves. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 43(3), 11-25.
https://doi.org/10.5937/PoljTeh1803011C

Cerović VB, Petrović D. Control components of hydrostatic and hydraulic systems: The valves. in Poljoprivredna tehnika. 2018;43(3):11-25.
doi:10.5937/PoljTeh1803011C .

Cerović, Vera B., Petrović, Dragan, "Control components of hydrostatic and hydraulic systems: The valves" in Poljoprivredna tehnika, 43, no. 3 (2018):11-25,
https://doi.org/10.5937/PoljTeh1803011C . .

TY  - JOUR
AU  - Cerović, Vera B.
AU  - Petrović, Dragan
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4869
AB  - The paper presents and analyzes the hydrostatic transmission of power and motion. The most important elements of this group of systems and the possibilities of their application in agricultural technology are given. Particular attention is paid to the positive-displacement pumps that have the widest application in agricultural machinery: gear pumps with external and internal gears, vane pumps, piston-axial pumps with inclined swash plate and piston-axial pumps with inclined cylinder block. Two hydrostatic power transmission and control systems are also presented. The first is a very simple mechanical- hydraulic system of automatic leveling of self-propelled berry fruits harvester. In contrast, the other hydrostatic system is very sophisticated. It is implemented as a very complex combination of hydrostatic and mechanical power transmission subsystems, with the accompanying control digital electronic system, and is intended for the wheat harvester propulsion and steering.
AB  - U radu je prikazan i analiziran hidrostatički prenos snage i upravljanja. Navedeni su najvažniji elementi ove grupe sistema i mogućnosti njihove primene u poljoprivrednoj tehnici. Posebno pažnja je posvećena zapreminskim pumpama koje nalaze najširu primenu u poljoprivrednoj mehanizaciji: zupčastim pumpama sa spoljašnjim i unutrašnjim ozubljenjem, krilnim pumpama, klipno-aksijalnim pumpama sa nagnutom kliznom pločom i klipno-aksijalnim pumpama sa nagnutim cilindarskim blokom. Prikazana su dva hidrostatička sistema prenosa snage i upravljanja.Prvi predstavlja veoma jednostavan mehaničko-hidraulički sistem automatske nivelacije samohodnog berača jagodastog voća.Drugi predstavljeni hidrostatički sistem spada u najsavremenije sisteme koji se koriste u poljoprivrednoj mehanizaciji. Izveden je kao veoma složena kombinacija hidrostatičkog i mehaničkog prenosnika snage sa pratećim upravljačkim digitalnim elektronskim sistemom, a namenjen je pogonu žitnog kombajna.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydrostatic transmission systems of power and motion
T1  - Hidrostatički sistemi prenosa snage poljoprivrednih mašina - zapreminske pumpe
EP  - 21
IS  - 1
SP  - 12
VL  - 43
DO  - 10.5937/PoljTeh1801012C
ER  - 

@article{
author = "Cerović, Vera B. and Petrović, Dragan",
year = "2018",
abstract = "The paper presents and analyzes the hydrostatic transmission of power and motion. The most important elements of this group of systems and the possibilities of their application in agricultural technology are given. Particular attention is paid to the positive-displacement pumps that have the widest application in agricultural machinery: gear pumps with external and internal gears, vane pumps, piston-axial pumps with inclined swash plate and piston-axial pumps with inclined cylinder block. Two hydrostatic power transmission and control systems are also presented. The first is a very simple mechanical- hydraulic system of automatic leveling of self-propelled berry fruits harvester. In contrast, the other hydrostatic system is very sophisticated. It is implemented as a very complex combination of hydrostatic and mechanical power transmission subsystems, with the accompanying control digital electronic system, and is intended for the wheat harvester propulsion and steering., U radu je prikazan i analiziran hidrostatički prenos snage i upravljanja. Navedeni su najvažniji elementi ove grupe sistema i mogućnosti njihove primene u poljoprivrednoj tehnici. Posebno pažnja je posvećena zapreminskim pumpama koje nalaze najširu primenu u poljoprivrednoj mehanizaciji: zupčastim pumpama sa spoljašnjim i unutrašnjim ozubljenjem, krilnim pumpama, klipno-aksijalnim pumpama sa nagnutom kliznom pločom i klipno-aksijalnim pumpama sa nagnutim cilindarskim blokom. Prikazana su dva hidrostatička sistema prenosa snage i upravljanja.Prvi predstavlja veoma jednostavan mehaničko-hidraulički sistem automatske nivelacije samohodnog berača jagodastog voća.Drugi predstavljeni hidrostatički sistem spada u najsavremenije sisteme koji se koriste u poljoprivrednoj mehanizaciji. Izveden je kao veoma složena kombinacija hidrostatičkog i mehaničkog prenosnika snage sa pratećim upravljačkim digitalnim elektronskim sistemom, a namenjen je pogonu žitnog kombajna.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydrostatic transmission systems of power and motion, Hidrostatički sistemi prenosa snage poljoprivrednih mašina - zapreminske pumpe",
pages = "21-12",
number = "1",
volume = "43",
doi = "10.5937/PoljTeh1801012C"
}

Cerović, V. B.,& Petrović, D.. (2018). Hydrostatic transmission systems of power and motion. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 43(1), 12-21.
https://doi.org/10.5937/PoljTeh1801012C

Cerović VB, Petrović D. Hydrostatic transmission systems of power and motion. in Poljoprivredna tehnika. 2018;43(1):12-21.
doi:10.5937/PoljTeh1801012C .

Cerović, Vera B., Petrović, Dragan, "Hydrostatic transmission systems of power and motion" in Poljoprivredna tehnika, 43, no. 1 (2018):12-21,
https://doi.org/10.5937/PoljTeh1801012C . .

TY  - CONF
AU  - Cerović, Vera B.
AU  - Mileusnić, Zoran
AU  - Petrović, Dragan
PY  - 2015
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3721
AB  - In the paper is presented an analytical model, formulated for 3D simulation of the tractor's dynamic stability on inclined terrains. Assuming the constant velocity and curvilinear trajectory of constant radius, it accounts for the gravity force, but also include in analysis the inertial force appeared because of curvilinear motion of the tractor. An appropriate computer code has been developed on the base of formulated algorithm, and applied to estimate the stability ranges of three tractors: Fendt Farmer 312, Fendt 926 and John Deer 6400. Tractors were tested for operational velocities in the range between 0 and 50 km/h, and for turning radiuses of 15 m and 60 m. The model represents a suitable tool for prelimminary estimations and comparisons of stability areals of the tractors operating at horizontal and especially at sloped terrains at different velocities.
PB  - Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb
C3  - Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering
T1  - Theoretical limmits of the angular stabiltity range of the tractor moving over inclined terrain
EP  - 121
SP  - 111
VL  - 43
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_3721
ER  - 

@conference{
author = "Cerović, Vera B. and Mileusnić, Zoran and Petrović, Dragan",
year = "2015",
abstract = "In the paper is presented an analytical model, formulated for 3D simulation of the tractor's dynamic stability on inclined terrains. Assuming the constant velocity and curvilinear trajectory of constant radius, it accounts for the gravity force, but also include in analysis the inertial force appeared because of curvilinear motion of the tractor. An appropriate computer code has been developed on the base of formulated algorithm, and applied to estimate the stability ranges of three tractors: Fendt Farmer 312, Fendt 926 and John Deer 6400. Tractors were tested for operational velocities in the range between 0 and 50 km/h, and for turning radiuses of 15 m and 60 m. The model represents a suitable tool for prelimminary estimations and comparisons of stability areals of the tractors operating at horizontal and especially at sloped terrains at different velocities.",
publisher = "Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb",
journal = "Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering",
title = "Theoretical limmits of the angular stabiltity range of the tractor moving over inclined terrain",
pages = "121-111",
volume = "43",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_3721"
}

Cerović, V. B., Mileusnić, Z.,& Petrović, D.. (2015). Theoretical limmits of the angular stabiltity range of the tractor moving over inclined terrain. in Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering
Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb., 43, 111-121.
https://hdl.handle.net/21.15107/rcub_agrospace_3721

Cerović VB, Mileusnić Z, Petrović D. Theoretical limmits of the angular stabiltity range of the tractor moving over inclined terrain. in Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering. 2015;43:111-121.
https://hdl.handle.net/21.15107/rcub_agrospace_3721 .

Cerović, Vera B., Mileusnić, Zoran, Petrović, Dragan, "Theoretical limmits of the angular stabiltity range of the tractor moving over inclined terrain" in Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering, 43 (2015):111-121,
https://hdl.handle.net/21.15107/rcub_agrospace_3721 .

TY  - CONF
AU  - Mileusnić, Zoran
AU  - Miodragović, Rajko
AU  - Dimitrijević, Aleksandra
AU  - Cerović, Vera B.
PY  - 2015
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3722
AB  - Contemporary agricultural production has high demands in sense of high productivity technical and production systems and thus imposes construction of new highly sophisticated technical solutions. One of these new solutions for the energy and economy efficient agricultural production is CASE STEIGER 400 tractor. The aim of the research was to determine the overall tractor working parameters and their optimization in tillage using a chisel plough. Obtained results show that the average fuel consumption during the field experiments was 38.8 l/ha, productivity 2.4 ha/h and energy consumption 68.6 kWh/ha. In the case of non-conventional tillage overall energy consumption was 250 MJ/ha, indicating that energy savings are feasible if adequate production technology is applied and technical systems used.
PB  - Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb
C3  - Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering
T1  - The energy parameters of the tractor-chisel plough
EP  - 230
SP  - 223
VL  - 43
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_3722
ER  - 

@conference{
author = "Mileusnić, Zoran and Miodragović, Rajko and Dimitrijević, Aleksandra and Cerović, Vera B.",
year = "2015",
abstract = "Contemporary agricultural production has high demands in sense of high productivity technical and production systems and thus imposes construction of new highly sophisticated technical solutions. One of these new solutions for the energy and economy efficient agricultural production is CASE STEIGER 400 tractor. The aim of the research was to determine the overall tractor working parameters and their optimization in tillage using a chisel plough. Obtained results show that the average fuel consumption during the field experiments was 38.8 l/ha, productivity 2.4 ha/h and energy consumption 68.6 kWh/ha. In the case of non-conventional tillage overall energy consumption was 250 MJ/ha, indicating that energy savings are feasible if adequate production technology is applied and technical systems used.",
publisher = "Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb",
journal = "Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering",
title = "The energy parameters of the tractor-chisel plough",
pages = "230-223",
volume = "43",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_3722"
}

Mileusnić, Z., Miodragović, R., Dimitrijević, A.,& Cerović, V. B.. (2015). The energy parameters of the tractor-chisel plough. in Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering
Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb., 43, 223-230.
https://hdl.handle.net/21.15107/rcub_agrospace_3722

Mileusnić Z, Miodragović R, Dimitrijević A, Cerović VB. The energy parameters of the tractor-chisel plough. in Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering. 2015;43:223-230.
https://hdl.handle.net/21.15107/rcub_agrospace_3722 .

Mileusnić, Zoran, Miodragović, Rajko, Dimitrijević, Aleksandra, Cerović, Vera B., "The energy parameters of the tractor-chisel plough" in Aktualni Zadaci Mehanizacije Poljoprivrede: Actual Tasks on Agricultural Engineering, 43 (2015):223-230,
https://hdl.handle.net/21.15107/rcub_agrospace_3722 .