Techno-economic method for evaluation and selection of flexible manufacturing systems (FMS)

To find best FMS solutions, experts use numerous multicriteria methods for evaluation and ranking, methods based on artificial intelligence, and multicriteria optimization methods. Presented in this paper is a developed technoeconomic method for evaluation and selection of FMS based on productivity. The method is based on group technology (GT) process planning

Logistic model of the security system in the military industry repair sector

The repair sector is a part of the military industry the establishment of the military combat readiness and thus the establishment of the state security system. This paper deals with the functional dependence of the military industry repair sector and the logistic model of a security system

Design and economic justification of group blanks application

Within the manufacturing process planning, blanks are either selected or designed, respectively forms of input material for the manufacture of products. Reviewed in this paper are three types of group blanks: group castings, group forgings manufactured by closed die forging and free forging, and group blanks manufactured by pressing melted metal in casts. The paper also presents requisites for design and evaluation of economic justification of group blanks application

Development of the computer-aided process planning (CAPP) system for polymer injection molds manufacturing

Beginning of production and selling of polymer products largely depends on mold manufacturing. The costs of mold manufacturing have significant share in the final price of a product. The best way to improve and rationalize polymer injection molds production process is by doing mold design automation and manufacturing process planning automation. This paper reviews development of a dedicated process planning system for manufacturing of the mold for injection molding, which integrates computer-aided design (CAD), computer-aided process planning (CAPP) and computer-aided manufacturing (CAM) technologies

Modeliranje odljevaka u RPPP sustavu za dijelove klipno-cilindarskog sklopa motora sa unutarnjim sagorjeva njem

Development of information technology industry provided great possibilities in the area of integration of different CAx systems, such as CAD, CAM, CAE and others. In order to successfully link systems of automated-design (or Computer Aided Design - CAD) with automated manufacturing systems (or Computer Aided Manufacturing – CAM), automation of manufacturing process planning is needed, i.e. CAPP (Computer-Aided Process Planning) systems can bridge a gap between design and manufacturing. In this paper is shown design of casting blanks in CAPP system for parts of piston-cylinder assembly of internal combustion engines in a manufacturing system.Dostignuta razina razvoja informacijskih tehnologija omogućila je značajne rezultate u području integracije različitih CAx sustava kao što su CAD, CAM, CAE i drugi programski sustavi. Da bi se uspješno povezali sustavi automatiziranog projektiranja proizvoda, odnosno CAD sustavi i sustavi automatizirane proizvodnje, odnosno CAM sustavi, potrebna je automatizacija projektiranja tehnološkog procesa izrade, dakle CAPP sustavi, koji predstavljaju most između projektiranja i proizvodnje. U ovom radu se prikazuje modeliranje odljevaka u integriranom CAPP sustavu za dijelove klipno-cilindarskog sklopa motora sa unutarnjim sagorjevanjem u jednom proizvodnom sustavu

Dizajn i ekonomska opravdanost primjene grupnih pripremaka

Within the manufacturing process planning, blanks are either selected or designed, respectively forms of input material for the manufacture of products. Reviewed in this paper are three types of group blanks: group castings, group forgings manufactured by closed die forging and free forging, and group blanks manufactured by pressing melted metal in casts. The paper also presents requisites for design and evaluation of economic justification of group blanks application.U okviru projektiranja tehnoloških procesa vrši se izbor ili projektiranje pripremaka, odnosno oblika ulaznog materijala za izradu proizvoda. U radu se prikazuju osnovne vrste grupnih pripremaka kao što su grupni odljevci, grupni otkivci proizvedeni u zatvorenim kalupima i hladnim zapreminskim oblikovanjem, slobodnim kovanjem, kao i grupni pripremci proizvedeni prešanjem rastopljenog metala u kalupima. U radu se, također, daju podloge za projektiranje i ocjenu ekonomske opravdanosti primjene grupnih pripremaka

Tehnoekonomska metoda za ocjenu i izbor fleksibilnih tehnoloških sustava (FTS)

To find best FMS solutions, experts use numerous multicriteria methods for evaluation and ranking, methods based on artificial intelligence, and multicriteria optimization methods. Presented in this paper is a developed technoeconomic method for evaluation and selection of FMS based on productivity. The method is based on group technology (GT) process planning.Za izbor najpovoljnijih rješenja FTS koriste se brojne multikriterijske ekspertske metode vrijednovanja i rangiranja, metode ustrojene na primjeni umjetne inteligencije, kao i metode multikriterijske optimizacije. U ovom radu prikazuje se razvijena tehnoekonomska metoda za ocjenu i izbor FTS na temelju proizvodnosti. Metoda je utemeljena na tehnološkim osnovama koje se obrazuju na principima grupne tehnologije (GT)

Dizajn modularnog sutava plastičnih euro paleta

Although pallet, as a tool, yields significant and widely recognized economic effects in production and distribution systems, it is still not fully utilized, indicating that it needs to be defined and developed as a specific product. Euro pallet product was designed using PRO/ENGINEER software system CAD module, as one of the most popular Cax systems, yielding a pallet of novel modular design that meets all the operational requirements of the existing range. The chosen material ensures high pallet longevity and durability, in line with the concept of sustainable development.Paleta kao sredstvo za rad ima izuzetan značaj i poznate ekonomske efekte u proizvodnim i distributivnim sustavima. Međutim, odnos prema paleti kao proizvodu, nije proporcionalan njenom ukupnom značaju. Obrazloženi aspekti neizostavno ukazuju na potrebe definiranja i razvoja palete kao specifičnog proizvoda. Dizajn proizvoda plastične euro palete je izveden u CAD modulu programskog sustava PRO/ENGINEER kao jednog od najpoznatijih CAx sustava. Dobijena je paleta novog modularnog koncepta koja ispunjava sve radne zahtjeve postojećih paleta. Izborom materijala je dobijena dugotrajnija paleta koncepta održivog razvoja

Supplementary data for article: Pantelić, M. M.; Zagorac, D. Č. D.; Ćirić, I. Ž.; Pergal, M. V.; Relić, D. J.; Todić, S. R.; Natić, M. M. Phenolic Profiles, Antioxidant Activity and Minerals in Leaves of Different Grapevine Varieties Grown in Serbia. Journal of Food Composition and Analysis 2017, 62, 76–83. https://doi.org/10.1016/j.jfca.2017.05.002

Supplementary material for: [https://doi.org/10.1016/j.jfca.2017.05.002]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2505]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/3063

Different modeling technologies of hydraulic load simulator for thrust vector control actuator

Hidraulički simulatori su posebice važni u procesu verifikacije aktuacijskog sustava za kontrolu leta. Fleksibilni mlaznik ima niz specifičnosti u odnosu na druge komande leta, jer se opterećenje ne može opisati na klasičan način preko zglobnog momenta. Pored toga, klasičan hidraulički simulator, na bazi cilindra koji simulira opterećenje, nije dovoljan za potpunu simulaciju realnog opterećenja. Potrebno je napraviti mehaničko njihalo na koje deluje hidraulički cilindar i koje se oslanja na dva elastična oslonca kako bi se mogle simulirati i dopunske pojave koje postoje kod fleksibilnog mlaznika, a koji ne postoje kod drugih upravljačkih površina. Preko njihala se može zadati impulsna sila koja postoji u realnosti, a koju nije moguće generirati standardnim hidrauličkim simulatorom. U članku se pokazuje da se modeliranjem elastičnog opterećenja preko bond grafova simulator može projektirati bez preciznog razmatranja smjerova i pravaca sila u elastičnoj strukturi, već se samo energetski promatra unošenje sile u fleksibilnu strukturu preko mjesta djelovanja aktuacijske sile. Simulator s hidrauličkim cilindrom je pogodan u slučaju kad treba razmotriti rizik od vlastitih vibracija fleksibilne veze i mlaznika, to jest definirati takozvani notch filter. Tada hidraulički cilindar simulatora opterećenja može generirati oscilatorno gibanje, frekvenciju i amplitudu koje odgovaraju ovom dinamičkom slučaju opterećenja aktuatora fleksibilnog mlaznika koje je svedeno na njegovu klipnjaču, a da ne postoji rizik oštećenja fleksibilne strukture koja postoji u konstrukciji simulatora s njihalom.Hydraulic simulators are extremely important in the flight control actuator system’s verification process. Flexible nozzle has a number of specifics, comparing to other flight controls, because the load cannot be described, classically, by the hinge moment. Additionally, classical hydraulic simulator, in which the cylinder simulates the load, is not sufficient for performing a complete simulation of the real load. Building a mechanical pendulum, to which a hydraulic cylinder acts, and that rests on two elastic supports, enables simulation of additional phenomena that exist in flexible nozzle, but not in other control surfaces. Force from impulse that exists in reality, and which is impossible to be generated by standard hydraulic simulator, can be realized through the pendulum. This paper demonstrates that a simulator can be designed through modelling of the elastic load using bond graph, without a precise elaboration of direction of forces in elastic structure, just by observing, on energy level, the input of force in flexible structure over the point in which actuator force acts. Simulator with hydraulic cylinder is convenient to be used when there is a need for considering the risk of self-oscillation of flexible joint and nozzle, i.e. for defining the so-called notch filter. Then, the hydraulic cylinder of load simulator can generate the oscillation, frequency and amplitude that match this dynamic case of flexible nozzle actuator’s load that is being reduced to its piston rod, without a risk of damaging the flexible structure that exists in the construction of a simulator with pendulum