Прегледај по Аутор "Trifković, Spasoje"
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- СтавкаANALIZA NAPONSKOG STANJA KUKE KORIŠĆENJEM MKE(Mašinski fakultet, Univerzitet Istočno Sarajevo, 2011) Trifković, Spasoje; Radić, Nebojša; Šehovac, Savo; Košarac, Aleksandar; Milutinović, MiroslavKuka je dio koji se najviše koristi za vješanje tereta kod dizalica. Težina kuke je teret koji dizalica mora uvijek dizati, čime se smanjuje nosivost i povećava potrebna snaga dizanja. Zbog toga, dimenzije kuke treba da imaju najmanje potrebne vrijednosti, pri propisanom stepenu sigurnosti. U ovom radu je izvršena analiza naponskog stanja kuke na uobičajeni način i uz pomoć računara, koristeći metodu konačnih elemenata (MKE). Uobičajeni način proračuna kuke se sastoji u provjeri napona u vlaknima materijala u pojedinim presjecima. Krivi dio kuke je proračunat na dva načina, približnom i tačnom metodom. U prvom slučaju je kuka posmatrana kao pravi stap ekscentrično opterećen, a u drugom kao krivi štap.
- СтавкаANALIZA POUZDANOSTI PODSISTEMA ZA KOPANJE ROTORNOG BAGERA ER - 1250 RELIABILITY ANALYSIS OF BUCKET WHEEL DRIVE ON BUCKET-WHEEL EXCAVAVTOR ER - 1250(Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu, 2010) Trifković, Spasoje; Kraišnik, Milija; Radić, NebojšaRad prikazuje izračunavanje pouzdanosti podsistema za kopanje bagera ER – 1250, za vremenski period od 2006. do 2009. godine. Za analizu otkaza korišćene su dvije metode iz teorije pouzdanosti, analiza stabla otkaza (FTA) i EFTES metoda alokacije pouzdanosti iz razloga njihove velike primjenjivosti i upotrebljivosti u analizama svih perioda životnog vijeka. Za realizaciju proračuna razvijen je programski paket za izračunavanje alociranog inteziteta otkaza i pouzdanosti.
- СтавкаDynamic Analysis of the Crane with Loading-unloading Trolley on the Slewing Platform(Institut IMK "14. oktobar", Kruševac, 2015) Trifković, Spasoje; Gašić, Milomir; Radić, Nebojša; Milutinović, Miroslav; Gašić, MilomirDynamic processes of the cranes with loading-unloading trolley on slewing platform are very complex and require certain simplifications, although efforts should be made to theoretically involve widest range of impacts, with respect to degree of importance of individual impacts. The study of the dynamic behavior of the cranes is very important in terms of precise determination of stress state, as well as the other characteristics of the elements and supporting structures. Dynamic loads of the cranes occur during periods of non-stationary operating regimes of any of its mechanisms. In this paper, we obtain the differential equations of motion of the cranes for some specific cases of movement, based on general multi-mass model of the crane with loading-unloading trolley on slewing platform.
- СтавкаEksperimentalno određivanje uticaja opterećenja na zagrijavanje kotrljajnog ležaja(Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu, 2017-03) Milutinović, Miroslav; Vučetić, Nikola; Trifković, Spasoje; Samardžija, Dejan; Milojković, SlobodanOsnovni zadatak ležaja jeste da omogući relativno kretanje obrtnih mašinskih dijelova tokom prenošenja opterećenja sa odgovarajućom tačnošću njihovog položaja. U toku rada obrtnih dijelova, na ležajima može doći do nastanka povišenih temperatura, koje mogu nastati usljed neispravnosti ležaja ili pak pojave preopterećenja. Radi određivanja uslova nastanka povišene temperature na kotrljanom ležaju usljed pojave preopterećenja, u ovom radu su vršena ispitivanja i upoređivanje rezultata neopterećenog i opterećenog ležaja poznatim masama. Za određivanje temperature ležaja korišćena je termovizijska kamera. Na osnovu dobijenih rezultata formiran je uporedni dijagram na kome se vidi tok zagrijavanja i hlađenja ležaja, za sva predmetna ispitivanja.
- СтавкаGEAR FAILURES EMBEDDED IN MANUAL GEARBOXES(University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2016) Milutinović, Miroslav; Trifković, Spasoje; Đurić, Aleksija; Vučetić, NikolaDuring exploitation motor vehicle gearboxes are exposed to varying conditions. The changes are stochastic and dependent on many factors. These changes directly affect also to the gearboxes damage, and therefore the gears damage. Different types of damage can occur on gears, so that this paper will give focus on the damage on gears. According to DIN 3979 over 20 types of damage appearing on gear are given, while in this paper only damages on gears that are in gearboxes embedded will be presented. The paper contains the results of the damage percentage of manual gearboxes and the results of cumulative damage of manual six-speed gearboxes.
- СтавкаMEASUREMENT OF TORQUE ON THE CARDAN SHAFT EMBEDDED IN THE FREIGHT VEHICLE(Faculty of Engineering Hunedoara, University Politehnica Timisoara, 2015) Milutinović, Miroslav; Đurić, Aleksija; Trifković, Spasoje; Vučetić, NikolaBefore analysis, development or improvement of existing structure of drive unit or gearboxes, the load that appearing in exploitation must be known. This paper presents a method of load (torque) measurement, on the cardan shaft embedded in the freight vehicle, using strain gages. The aim of the study is to determine torque variation depending on the exploitation conditions (road surface, speed transmission, vehicle load, etc). The measurement was performed for different road characteristics (vehicle movement on flat terrain, up and down the slope). Results are presented using tables and diagrams, and percentage utilization of the power drive unit, embedded into freight vehicle, was calculated based on obtained values of torque. Obtained results have an important role for designers because they give a general insight in the load on the cardan shaft , which represent the basis for future development or redesign of power unit or gearboxes and basis for forming of specter of gear load and bearing embedded into gearbox.
- СтавкаMJERENJE OBRTNOG MOMENTA NA KARDANOVOM VRATILU UGRAĐENOM U TERETNO MOTORNO VOZILO(Mašinski fakultet, Univerzitet Istočno Sarajevo, 2014) Milutinović, Miroslav; Đurić, Aleksija; Trifković, Spasoje; Vučetić, Nikola; Marković, Biljana; Antunović, RankoZa analize, razvoj ili usavršavanje postojeće konstrukcije pogonskog agregata ili mjenjačkog prenosnika potrebno je prije svega poznavanje opterećenja koje nastaju u toku eksploatacije. U radu je predstavljen način mjerenja opterećenja (obrtnog momenta), na kardanovom vratilu ugrađenom u teretno motorno vozilo, primjenom mjernih traka. Cilj rada je utvrđivanje varijacija obrtnog momenta zavisno od uslova eksploatacije (podloge puta, stepeni prenosa, opterećenja vozila, i dr.). Mjerenje je izvršeno za različite putne karakterisitke (kretanje vozila po ravnom terenu, uz i niz nagib). Rezultati su predstavljeni tabelarno i pomoću dijagrama, a na osnovu dobijenih vrijednosti obrtnog momenta izračunato je procentualno iskorišćenje snage pogonskog agregata ugrađenog u predmetno vozilo. Dobijeni rezultati imaju značajnu ulogu za konstruktore jer daje sveobuhvatnost opterećenja na kardanovom vratilu, a koji predstavljaju podlogu za budući razvoj ili rekonstrukciju pogonskog agregata ili mjenjačkog prenosnika, te osnovu za formiranje spektara opterećenja zupčanika i ležaja ugrađenih u mjenjački prenosnik.
- СтавкаNUMERICAL ANALYSIS OF FREE UPSETTING CYLINDER USING FEM WITH EXPERIMENTAL VERIFICATION(Elektrotehnički fakultet, 2011) Radić, Nebojša; Kraišnik, Milija; Trifković, SpasojeThis paper describes numerical simulation of upsetting process of cylindrical specimen by flat die performed by Finite Element Analysis on the bases of results of experimental research. Software CATIA V5 R18 is used for modeling and simulation. Having in mind that during the upsetting process large deformation occurred, nonlinear analysis is performed. It is needed to take into consideration large displacement and contact friction, as well as large pressure cylinder and rigid die. Results gained by Finite Element Analysis and by experiment show high degree of similarity, so this way of modeling could be used for even more complex technology of plasticity.
- СтавкаPOREĐENJE REZULTATA SOPSTVENIH FREKVENCIJA KARBONSKIH NANOCIJEVI DOBIJENIH METODOM KONAČNIH ELEMENATA (MKE) I ANALITIČKOM METODOM(Mašinski fakultet, Univerzitet Istočno Sarajevo, 2014) Vučetić, Nikola; Radić, Nebojša; Milutinović, Miroslav; Trifković, Spasoje; Košarac, AleksandarKroz ovaj rad je izvršeno poređenje rezultata sopstvenih frekvencija karbonskih nanocijevi dobijenih korišćenjem MKE analize i analitičke metode. Svako tijelo ima sopstvenu frekvenciju kojom osciluje ukoliko nije izloženo dejstvu spoljašnjih sila. Cilj rada je da se utvrdi jednakopravnost MKE analize i analitičke metode u izračunavanju sopstvenih frekvencija karbonskih nanocijevi. Izračunate su sopstvene frekvencije karbonskih nanocijevi kružnog i kvadratnog poprečnog presjeka putem MKE analize i analitičke metode, te je izvršeno poređenje dobijenih rezultata prikazanih tabelarno i na dijagramima. Na osnovu dobijenih vrijednosti može se zaključiti da se odstupanja u rezultatima pri određivanju sopstvenih frekvencija nanocijevi putem MKE analize i analitičke metode nalaze u dozvoljenim granicama.
- СтавкаPRORAČUN TROSEGMENTNOG STUBA ZA JAVNU RASVJETU(Mašinski fakultet, Univerzitet Istočno Sarajevo, 2018) Trifković, Spasoje; Milutinović, Miroslav; Golijanin, Saša; Golubović, Dušan; Košarac, Aleksandar; Jeremić, DejanU radu je izvršen statički proračun stuba sa za javnu rasvjetu sa proračunom čvrstoće stuba u kritičnim presjecima za najnepovoljniji slučaj opterećenja stuba. Visina stuba je 8m sa tri segmenta iste dužine prečnika 133mm, 108mm i 76mm sa dvije noseće lire visine dužine 1,5m.
- СтавкаReliability Evaluation of Transmission Planetary Gears “bottom-up” approach(Polish Maintenance Society, 2023) Živković, Predrag; Milutinović, Miroslav; Tica, Milan; Trifković, Spasoje; Čamagić, Ivica; Niewczas, AndrzejThe reliability study is the most important part of the engineering design process, as it is the basis of analysis and assessment of future product performance in exploitation. Since performance cannot be predicted with absolute certainty, the application of reliability theory includes probability theory and unreliability modeling. The proposed approach has been applied to assess the reliability of gear planetary power transmissions. The assessment of system reliability was determined on the basis of the block diagram method, as a function of the reliability of individual components, calculated by statistical analysis. Using the Weibull model, the reliability of the planetary gear was defined on the basis of the probability of failure of the gear teeth and the results were interpreted to assess the reliability of the component and the entire planetary train. For a more precise assessment of reliability and to avoid modeling every failure and mode of occurrence, a competitive risk model was developed. The reliability assessment study was conducted with a “bottom-up” approach. Reliability has been assessed, for instantaneous, estimated and assigned failures rate of planetary train and component.
- СтавкаReliability Evaluation of Transmission Planetary Gears “bottom-up” approach(Polish Maintanace Society, 2023) Živković, Predrag; Milutinović, Miroslav; Tica, Milan; Trifković, Spasoje; Čamagić, IvicaThe reliability study is the most important part of the engineering design process, as it is the basis of analysis and assessment of future product performance in exploitation. Since performance cannot be predicted with absolute certainty, the application of reliability theory includes probability theory and unreliability modeling. The proposed approach has been applied to assess the reliability of gear planetary power transmissions. The assessment of system reliability was determined on the basis of the block diagram method, as a function of the reliability of individual components, calculated by statistical analysis. Using the Weibull model, the reliability of the planetary gear was defined on the basis of the probability of failure of the gear teeth and the results were interpreted to assess the reliability of the component and the entire planetary train. For a more precise assessment of reliability and to avoid modeling every failure and mode of occurrence, a competitive risk model was developed. The reliability assessment study was conducted with a “bottom-up” approach. Reliability has been assessed, for instantaneous, estimated and assigned failures rate of planetary train and component.
- СтавкаUticaj interakcije lokalnog i distorzionog oblika gubitka stabilnosti tankozidih profila otvorenog poprečnog presjeka na smanjenje nosivosti u postkritičnoj fazi(Institut IMK "14. oktobar", 2012) Radić, Nebojša; Trifković, Spasoje; Jeremić, Dejan; Milutinović, Miroslav; Gašić, MilomirU radu se razmatra problem određivanja vrijednosti lokalnog i distorzionog kritičnog napona tankozidih profila otvorenog poprečnog presjeka. Kod tankozidih nosača gubitak stabilnosti se dešava u zoni elastičnosti i pri relativno malim vrijednostima kritičnog napona. Sa povećanjem opterećenja u postkritičnoj fazi pri određivanju nosivosti potrebno je uzeti u obzir interakciju lokalnog i distorzionog oblika jer dolazi do značajnog smanjenja nosivosti u odnosu na slučaj kada se ta interakcija zanemaruje.