TY  - JOUR
AU  - Stojiljković, Branimir
AU  - Vasov, Ljubiša
AU  - Cokorilo, Olja
AU  - Vorotović, Goran
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3505
AB  - Purpose The purpose of this paper is to present novel recursive expressions for modelling the replacement costs of aircraft engine life-limited parts during shop visits to assist engine operators in both evaluating their decisions regarding the applied life-limited parts management strategies and tracking the replacement costs consistently throughout the life of the engine. Design/methodology/approach The replacement costs of aircraft engine life-limited parts are modelled analytically in this research, which strives to quantify the costs of used and unused lives of the replaced parts, incurred during engine shop visit events. Inputs for this model include the list price of life-limited parts, the replacement decisions made on all previous shop visits and the number of cycles the engine has operated at different thrust ratings on all previous operating intervals. Findings The average annual escalation rate of life-limited parts list prices was shown to range from 5% to 7%. The presented model is not only suitable for calculating the costs of used and unused lives of life-limited parts during past engine shop visit events but also for application in the life-limited parts replacement cost forecasting and optimisation models. Originality/value Uniquely derived recursive expressions represent the final result of the developed model which, to the authors' knowledge, had not been studied elsewhere in the academic literature. The analysis of aircraft engine life-limited part list prices carried out to account for the average annual escalation rate enables the prediction of replacement costs during subsequent shop visits.
PB  - Emerald Group Publishing Ltd, Bingley
T2  - Aircraft Engineering and Aerospace Technology
T1  - An analytical model of the replacement costs of aircraft engine life-limited parts
EP  - 782
IS  - 5
SP  - 776
VL  - 93
DO  - 10.1108/AEAT-12-2020-0297
ER  - 

@article{
author = "Stojiljković, Branimir and Vasov, Ljubiša and Cokorilo, Olja and Vorotović, Goran",
year = "2021",
abstract = "Purpose The purpose of this paper is to present novel recursive expressions for modelling the replacement costs of aircraft engine life-limited parts during shop visits to assist engine operators in both evaluating their decisions regarding the applied life-limited parts management strategies and tracking the replacement costs consistently throughout the life of the engine. Design/methodology/approach The replacement costs of aircraft engine life-limited parts are modelled analytically in this research, which strives to quantify the costs of used and unused lives of the replaced parts, incurred during engine shop visit events. Inputs for this model include the list price of life-limited parts, the replacement decisions made on all previous shop visits and the number of cycles the engine has operated at different thrust ratings on all previous operating intervals. Findings The average annual escalation rate of life-limited parts list prices was shown to range from 5% to 7%. The presented model is not only suitable for calculating the costs of used and unused lives of life-limited parts during past engine shop visit events but also for application in the life-limited parts replacement cost forecasting and optimisation models. Originality/value Uniquely derived recursive expressions represent the final result of the developed model which, to the authors' knowledge, had not been studied elsewhere in the academic literature. The analysis of aircraft engine life-limited part list prices carried out to account for the average annual escalation rate enables the prediction of replacement costs during subsequent shop visits.",
publisher = "Emerald Group Publishing Ltd, Bingley",
journal = "Aircraft Engineering and Aerospace Technology",
title = "An analytical model of the replacement costs of aircraft engine life-limited parts",
pages = "782-776",
number = "5",
volume = "93",
doi = "10.1108/AEAT-12-2020-0297"
}

Stojiljković, B., Vasov, L., Cokorilo, O.,& Vorotović, G.. (2021). An analytical model of the replacement costs of aircraft engine life-limited parts. in Aircraft Engineering and Aerospace Technology
Emerald Group Publishing Ltd, Bingley., 93(5), 776-782.
https://doi.org/10.1108/AEAT-12-2020-0297

Stojiljković B, Vasov L, Cokorilo O, Vorotović G. An analytical model of the replacement costs of aircraft engine life-limited parts. in Aircraft Engineering and Aerospace Technology. 2021;93(5):776-782.
doi:10.1108/AEAT-12-2020-0297 .

Stojiljković, Branimir, Vasov, Ljubiša, Cokorilo, Olja, Vorotović, Goran, "An analytical model of the replacement costs of aircraft engine life-limited parts" in Aircraft Engineering and Aerospace Technology, 93, no. 5 (2021):776-782,
https://doi.org/10.1108/AEAT-12-2020-0297 . .

TY  - JOUR
AU  - Mitrović, Časlav
AU  - Vorotović, Goran
AU  - Petrović, Nebojša
AU  - Stamenković, Dragan
AU  - Stojiljković, Svetlana
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2043
AB  - Ovaj rad prezentuje statičko testiranje strukture kompozitne lopatice W55RBVS vetrogeneratora snage do6kW. Testiranje je bazirano na statičkom testiranju strukture do trenutka loma lopatice. Glavni cilj testiranja je definisanje krutosti lopaticeW55RBVS, određivanje maksimalne sile koja dovodi do loma kao i relativni razmah loma lopatice. Kompozitne lopatice W55RBVS, proizvedene u firmi WING.d.o.o., a ugrađuju se na dvokraki vetrogenerator Eoltec Scirocco. Ovaj test je definisan standardom IEC 61400-2. Ispitivanje lopatica je izvršeno u Laboratoriji za aerotehniku Mašinskog fakulteta Univerziteta u Beogradu. Test opterećenja se izvodi do momenta loma lopatice.Rezultat testiranja će biti iskorišćen za redizajniranje lopatice W55RBVS.
AB  - This work demonstrates static testing of a composite blade W55RBVS structure for the wind turbines of up to 6kW power. The testing consists of the static testing of the structure up to the moment of the blade failure. The main purpose of the testing is to define and directly verify the rigidity of the blade W55RBVS,to determine the maximum force which leads to failure and the relative span of the blade failure. W55RBVS composite blades, manufactured by the company WING. doo and are installed on a two-blades wind turbine Eoltec Scirocco. This test is defined in the standard IEC 61400-2 /8/. Blade testing is performed in the Aerotechnics Laboratory of the Faculty of Mechanical Engineering, Belgrade University. The load test is performed up to the moment of the blade failure. The result of the testing will be used in order to improve the design of the blade W55RBVS.
PB  - Institut za istraživanja i projektovanja u privredi, Beograd
T2  - Journal of Applied Engineering Science
T1  - Napredne metode ispitivanja strukture lopatica malih vetroturbina do pojave loma
T1  - Advanced structural testing methods for small wind turbines blade up to failure
EP  - 136
IS  - 2
SP  - 129
VL  - 12
DO  - 10.5937/jaes12-5787
ER  - 

@article{
author = "Mitrović, Časlav and Vorotović, Goran and Petrović, Nebojša and Stamenković, Dragan and Stojiljković, Svetlana",
year = "2014",
abstract = "Ovaj rad prezentuje statičko testiranje strukture kompozitne lopatice W55RBVS vetrogeneratora snage do6kW. Testiranje je bazirano na statičkom testiranju strukture do trenutka loma lopatice. Glavni cilj testiranja je definisanje krutosti lopaticeW55RBVS, određivanje maksimalne sile koja dovodi do loma kao i relativni razmah loma lopatice. Kompozitne lopatice W55RBVS, proizvedene u firmi WING.d.o.o., a ugrađuju se na dvokraki vetrogenerator Eoltec Scirocco. Ovaj test je definisan standardom IEC 61400-2. Ispitivanje lopatica je izvršeno u Laboratoriji za aerotehniku Mašinskog fakulteta Univerziteta u Beogradu. Test opterećenja se izvodi do momenta loma lopatice.Rezultat testiranja će biti iskorišćen za redizajniranje lopatice W55RBVS., This work demonstrates static testing of a composite blade W55RBVS structure for the wind turbines of up to 6kW power. The testing consists of the static testing of the structure up to the moment of the blade failure. The main purpose of the testing is to define and directly verify the rigidity of the blade W55RBVS,to determine the maximum force which leads to failure and the relative span of the blade failure. W55RBVS composite blades, manufactured by the company WING. doo and are installed on a two-blades wind turbine Eoltec Scirocco. This test is defined in the standard IEC 61400-2 /8/. Blade testing is performed in the Aerotechnics Laboratory of the Faculty of Mechanical Engineering, Belgrade University. The load test is performed up to the moment of the blade failure. The result of the testing will be used in order to improve the design of the blade W55RBVS.",
publisher = "Institut za istraživanja i projektovanja u privredi, Beograd",
journal = "Journal of Applied Engineering Science",
title = "Napredne metode ispitivanja strukture lopatica malih vetroturbina do pojave loma, Advanced structural testing methods for small wind turbines blade up to failure",
pages = "136-129",
number = "2",
volume = "12",
doi = "10.5937/jaes12-5787"
}

Mitrović, Č., Vorotović, G., Petrović, N., Stamenković, D.,& Stojiljković, S.. (2014). Napredne metode ispitivanja strukture lopatica malih vetroturbina do pojave loma. in Journal of Applied Engineering Science
Institut za istraživanja i projektovanja u privredi, Beograd., 12(2), 129-136.
https://doi.org/10.5937/jaes12-5787

Mitrović Č, Vorotović G, Petrović N, Stamenković D, Stojiljković S. Napredne metode ispitivanja strukture lopatica malih vetroturbina do pojave loma. in Journal of Applied Engineering Science. 2014;12(2):129-136.
doi:10.5937/jaes12-5787 .

Mitrović, Časlav, Vorotović, Goran, Petrović, Nebojša, Stamenković, Dragan, Stojiljković, Svetlana, "Napredne metode ispitivanja strukture lopatica malih vetroturbina do pojave loma" in Journal of Applied Engineering Science, 12, no. 2 (2014):129-136,
https://doi.org/10.5937/jaes12-5787 . .

TY  - JOUR
AU  - Petrović, Dragan V.
AU  - Mitrović, Časlav
AU  - Trišović, Nataša
AU  - Golubović, Zorana
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1230
AB  - When filtering products with a high level of non-soluble solids and containing filtration-inhibiting substances, a variety of different filter aids can be used. Among others, kieselguhr and perlite are possible materials for this purpose. The selection of the granulation that should be applied depends on the filtered liquid medium and the desired retention level. While perlite is most commonly used for rough filtration, kieselguhr is also suitable for more subtile filtration. In the paper, particle size distributions of three kieselguhr granulations and a perlite granulation are analysed. Particle sizes are measured by the morphometric method commonly used in the microbiology. Basic statistic parameters are calculated for all considered samples and compared. The applicability of hyperbolic and log-hyperbolic functions, in describing the particles size distributions of these granulations is verified. Depending on the imposed filtration requirements, this approach enables simple modelling and composition of a wide variety of different granulations characterised by appropriate particle size distributions from a few available granulations.
PB  - Assoc Mechanical Engineers Technicians Slovenia, Ljubljana
T2  - Strojniski Vestnik-Journal of Mechanical Engineering
T1  - On the Particles Size Distributions of Diatomaceous Earth and Perlite Granulations
EP  - 850
IS  - 11
SP  - 843
VL  - 57
DO  - 10.5545/sv-jme.2010.050
ER  - 

@article{
author = "Petrović, Dragan V. and Mitrović, Časlav and Trišović, Nataša and Golubović, Zorana",
year = "2011",
abstract = "When filtering products with a high level of non-soluble solids and containing filtration-inhibiting substances, a variety of different filter aids can be used. Among others, kieselguhr and perlite are possible materials for this purpose. The selection of the granulation that should be applied depends on the filtered liquid medium and the desired retention level. While perlite is most commonly used for rough filtration, kieselguhr is also suitable for more subtile filtration. In the paper, particle size distributions of three kieselguhr granulations and a perlite granulation are analysed. Particle sizes are measured by the morphometric method commonly used in the microbiology. Basic statistic parameters are calculated for all considered samples and compared. The applicability of hyperbolic and log-hyperbolic functions, in describing the particles size distributions of these granulations is verified. Depending on the imposed filtration requirements, this approach enables simple modelling and composition of a wide variety of different granulations characterised by appropriate particle size distributions from a few available granulations.",
publisher = "Assoc Mechanical Engineers Technicians Slovenia, Ljubljana",
journal = "Strojniski Vestnik-Journal of Mechanical Engineering",
title = "On the Particles Size Distributions of Diatomaceous Earth and Perlite Granulations",
pages = "850-843",
number = "11",
volume = "57",
doi = "10.5545/sv-jme.2010.050"
}

Petrović, D. V., Mitrović, Č., Trišović, N.,& Golubović, Z.. (2011). On the Particles Size Distributions of Diatomaceous Earth and Perlite Granulations. in Strojniski Vestnik-Journal of Mechanical Engineering
Assoc Mechanical Engineers Technicians Slovenia, Ljubljana., 57(11), 843-850.
https://doi.org/10.5545/sv-jme.2010.050

Petrović DV, Mitrović Č, Trišović N, Golubović Z. On the Particles Size Distributions of Diatomaceous Earth and Perlite Granulations. in Strojniski Vestnik-Journal of Mechanical Engineering. 2011;57(11):843-850.
doi:10.5545/sv-jme.2010.050 .

Petrović, Dragan V., Mitrović, Časlav, Trišović, Nataša, Golubović, Zorana, "On the Particles Size Distributions of Diatomaceous Earth and Perlite Granulations" in Strojniski Vestnik-Journal of Mechanical Engineering, 57, no. 11 (2011):843-850,
https://doi.org/10.5545/sv-jme.2010.050 . .