Papers by Aleksandar Joksimovic
Le Centre pour la Communication Scientifique Directe - HAL - Université Paris Descartes, Oct 7, 2019
In the context of increasing attention given to aircraft propulsive system electrification by the... more In the context of increasing attention given to aircraft propulsive system electrification by the aeronautical community, Department of Aerodynamics, Energetics and Propulsion at ISAE-SUPAERO is undertaking an effort to develop a preliminary sizing tool for aeroplanes with propulsive architectures ranging between conventional gas turbine and different hybrid-electric solutions. The baseline used to initiate this work is semi-empirical handbook sizing method by Jan Roskam. The method is firstly extended by introducing a generic propulsive power architecture space, described parametrically by an array of power hybridisation parameters. Furthermore, a proposal of modified Breguet range equation is given for fuel weight iterations including batteries. With these upgrades, a trial sizing run was performed on a Pilatus PC-12 test case to verify the functioning of the developed tool. A more comprehensive study of an equivalent aeroplane powered with various hybrid-electric solutions is then presented, along with an associated parametric study. Mission performance results of all the hybrid architectures are inferior to the ones for the fuel-based baseline, with the most promising solutions indicated by the results being series and parallel hybrid architectures. While the tool produces qualitatively coherent results, the quantitative validity thereof is yet to be ascertained. Notably, the hybrid range equation needs to be further placed under scrutiny and its applicability for mission sizing of all the hybrid architectures of interest is to be validated. In the long run, the work will look into other current limitations such as lack of possibility to consider battery recharge in the mission calculations or lack of capability to perform sensitivity studies.
In recent years, tendencies have been emerging to evolve airplanes from the traditional ”tube and... more In recent years, tendencies have been emerging to evolve airplanes from the traditional ”tube and wing” paradigm to more integrated and efficient platforms. Taking this upcoming trend as a starting point, with Boeing 737 aircraft as the case study platform, the presented work covers two global areas of research: an aerodynamic analysis of powerplant installation and a study of airplane non-propulsive energies. An application case was developed in aircraft preliminary design software Pacelab, in order to perform analysis at the aircraft level. Firstly, a detailed insight into promising new propulsive architectures to explore is provided, and a potential for use of over-the-wing nacelle configurations, which have not been largely exploited in civilian airplanes so far, is discussed. The software is upgraded in order to enable introduction of these alternative powerplant configurations as well as the resulting aerodynamic interactions. Secondly, an analysis of the energy breakdown unde...
Well established airplane design methodologies such as the ones by J. Roskam and D. Raymer are no... more Well established airplane design methodologies such as the ones by J. Roskam and D. Raymer are not applicable to highly integrated airframe-engine sys- tems like Boundary Layer Ingestion (BLI) airplanes; in order to employ such methodologies, they need to be adapted to take into account properties of BLI air- planes. The article details one such new approach to airplane design methodologies, and focuses on preliminary sizing phase of the design. While taking existing methodologies as starting point, it is adapted to airplane architectures with partial or complete BLI propulsion. It takes up existing methodologies and in- troduces three additional parameters taking into ac- count the effect of BLI on: airplane lift-to-drag ratio, fuel burn and the engine weight. The impact is evaluated as a function of the new parameter alpha, which is introduced to describe the ratio of BLI thrust to the total cruise thrust. The resulting model fits the B737-800 preliminary sizing parameters and det...
Mediterranean Marine Science, 2016
In this Collective Article on “New Mediterranean Biodiversity Records”, we present additional rec... more In this Collective Article on “New Mediterranean Biodiversity Records”, we present additional records of species found in the Mediterranean Sea. These records refer to eight different countries throughout the northern part of the basin, and include 28 species, belonging to five phyla. The findings per country include the following species: Spain: Callinectes sapidus and Chelidonura fulvipunctata; Monaco: Aplysia dactylomela; Italy: Charybdis (Charybdis) feriata, Carcharodon carcharias, Seriola fasciata, and Siganus rivulatus; Malta: Pomacanthus asfur; Croatia: Lagocephalus sceleratus and Pomadasys incisus; Montenegro: Lagocephalus sceleratus; Greece: Amathia (Zoobotryon) verticillata, Atys cf. macandrewii, Cerithium scabridum, Chama pacifica, Dendostrea cf. folium, Ergalatax junionae, Septifer cumingii, Syphonota geographica, Syrnola fasciata, Oxyurichthys petersi, Scarus ghobban, Scorpaena maderensis, Solea aegyptiaca and Upeneus pori; Turkey: Lobotes surinamensis, Ruvettus pretios...
In direct application of scientific discoveries to good quality training process, royal jelly as ... more In direct application of scientific discoveries to good quality training process, royal jelly as a supplement is applied as a criterion of positive change in the phase of adaptation and exhaustion of young football players' bodies. Research carried out with 25 FC "Red Star" Belgrade football players, 12 years old, separated in 2 groups. Experimental group (15) took the supplement daily for two months. The control group (10) did not use the supplement. All the examines during the two months had a regular regime of training (4 times per week) and they competed in the youngest Belgrade league. It were observed 13 morphological characteristics in initial and final measuring. On the basis of the research results it could be concluded that football players from experimental group who used royal jelly had statistically significant increase of body height and muscle component, and decrease of fat component in final measurement comparing to the initial. Also, the results show s...
Marine Biodiversity Records, 2009
An additional record of one of the most successful lessepsian migrants in the Mediterranean, Fist... more An additional record of one of the most successful lessepsian migrants in the Mediterranean, Fistularia commersonii (Osteichthyes: Fistularidae), indicates the spreading of this species in the Adriatic Sea. This is by far the only lessepsian migrant with multiple confirmed records, separated in time and space, for the Adriatic. Its fast spreading is followed by rapid population explosion at invaded areas and potential effects on the local fish fauna are emphasized.
Journal of Human Kinetics, 2009
Hematological Profile of Serbian Youth National Soccer Teams Soccer is one of the most widely pla... more Hematological Profile of Serbian Youth National Soccer Teams Soccer is one of the most widely played and complex sports in the world, where players need technical, tactical, and physical skills to succeed. Technical and tactical skills in soccer are highly dependent on the player's physical capacity. The selection, development and professional guidance of young players is a priority for many top soccer clubs in order to maintain their sporting and financial status. The aim of the present study was to determine hematological profile of youth national soccer teams and to compare the values of fifteen hematological parameters between 3 Serbian youth national teams (under 14, 15 and 16 years old), as well as between soccer players and nonathletes. 80 young soccer players and 30 non-athletes participated in the study. 15 hematologic parameters (WBC, RBC, HGB, HCT, PLT, MCV, MCH, MCHC, PDW, LYM%, MON%, GRAN%, LYM, MON, GRAN) were measured. In order to determine the significance of dif...
During the last century it is observed that there is a lot of changes in the field of growth and ... more During the last century it is observed that there is a lot of changes in the field of growth and development new generation familiar as acceleration of growth and development. The main goal of this research represents the derivation some knowledge about the difference of some morphological characteristics between two generation children of the same aged in a football school. The sample involves 43 male children aged ten years old who were tested in 1997 and 52 male children who were tested in 2007. The variables involve 12 anthropometrical measures which define longitudinal and transversal measures of skeleton, volume and mass of the body and under skin fat. The data is arranged by t-test.
2021 IEEE International Symposium on Systems Engineering (ISSE)
The contemporary debate on the need for the civil aeronautical industry to reconcile its global w... more The contemporary debate on the need for the civil aeronautical industry to reconcile its global warming impact and the continuous air traffic growth is gaining in prominence. While solutions exist to tackle different aspects of this complex problem individually, the core of the response lies in rethinking the conventional aeroplane architecture in order to reach new energy efficiency optima. This paper presents a function-to-form framework used for describing different aspects of architectural design of an aeroplane as technological system. Firstly, a brief overview of different existing ways to improve aeroplane architectures is given. With that background, a preliminary definition of multi-level system composition of an aeroplane is presented. A physics-based framework is then correlated to the Functional, Behavioural, Structural and Experiential requirement framework, in order to characterise the different physical phenomena experienced by an aeroplane for a single operating point. These provide basis for definition of a qualitative figure of merit dubbed Integration Potential of an architecture, which serves as proxy for describing function-to-form mapping of aeroplane system architectures. Using both the historical, contemporary and projected tendencies of aeroplane technology advances, existence of an asymptotic limit of this parameter is inferred. This limit arguably indicates the extent to which it could still be possible to go in search for energy efficiency gains by virtue of system architecture design.
The state of biodiversity reflects the degree of stability and persistence of ecosystems, especia... more The state of biodiversity reflects the degree of stability and persistence of ecosystems, especially in cases of significant direct or indirect anthropogenic impacts on marine environment. The early life stages of fishes at three locations in the area of marina Porto Montenegro were analyzed during spring and summer of 2016, 2017 and 2018 by monthly dynamics (March-August). The aim of this work is to compare the diversity of species with existing data, especially after the formation of the exclusive marina and to estimate possible impact on the distribution and species composition. Investigation shows dominance of anchovy (<em>E. encrasicolus</em>) and sand steenbras (<em>Lithognatus mormyrus</em>). Total ichthyoplankton abundance was lowest during 2017 when total abundance was in range from 4-24 eggs/larvae per m2 of sea surface, while during 2016 and 2018 total abundance was in range from 4-67 and 4-86 eggs/larvae per m2 of sea surface, respectively. It can...
Specimens of <em>Eledone cirrhosa</em> were obtained from commercial bottom trawl hau... more Specimens of <em>Eledone cirrhosa</em> were obtained from commercial bottom trawl hauls following the MEDITS protocol. Catches were standardised according to the swept area method, and the resulting values were used to calculate biomass (kg/km<sup>2</sup>) and abundance (ind/km<sup>2</sup>) indices. The results showed that <em>E. cirrhosa</em> was not found at depths below 5 m or over 500. The species is consistently present year-round only in 100–200 m stratum and its presence in shallower and deeper strata seems to be season-dependent: in spring, it is present only at 100–200 m depth, while in autumn and winter it can be found at 100–200 m and 200–500 m depth strata. Only in summer can it be found in all three depth strata (50–100 m, 100–200 m, 200–500 m). Both abundance and biomass indices were consistently most abundant in 100–200 m depth stratum.
Marine fisheries in Montenegro are divided into two main categories: commercial fisheries which a... more Marine fisheries in Montenegro are divided into two main categories: commercial fisheries which are divided into large-scale and small-scale fisheries (classification based on the length of the vessel as well as type, size and number of fishing gears) and sport and recreational fisheries. Institute of Marine Biology is the only institution in Montenegro that collects biological data related to marine fisheries. The official data on the catch of marine fish by species in Montenegro is collected, processed and published by MONSTAT (Bureau of Statistics). Montenegro, as a responsible member of the General Fisheries Commission for the Mediterranean, deeply respects the principles and efforts that this body implements in the Mediterranean and the Black Sea. Montenegrin scientists and administration actively participate in all working groups related to fisheries and resource conservation issues. Unfortunately, unlike all the other Adriatic countries which have modernized and renewed their...
Following the latest aggressive emission and external noise reduction targets set by the aviation... more Following the latest aggressive emission and external noise reduction targets set by the aviation industry, there now exists an increasing amount of research and emphasis on changing the propulsion and power systems of aircraft. With the aim of expanding upon the current repository of studies focusing on tightly-coupled and integrated hybrid-electric propulsion systems, a new approach to the preliminary sizing of such systems is introduced herein.The purpose of this approach is to establish a methodology for the fully integrated prelimi- nary sizing of hybrid-electric airplanes. The specificity of the established methodology is its ability to cover a variety of implementations on different hybrid-electric airplanes. Furthermore, a sensitivity study is performed to assess the impact of hybridization ratio on airplane max takeoff weight. Finally, in order to assess its accuracy and validity, due to the lack of data on hybrid- electric airplanes the sizing method was applied to the air...
AIAA Aviation 2019 Forum, 2019
Due to strengthening of environmental constraints and current industrial competitiveness, the air... more Due to strengthening of environmental constraints and current industrial competitiveness, the airplane manufacturing industry is urged to turn towards an increase use of sustainable energy sources. A prominent concept is airplane electrification, either of the engine or various non-propulsive systems. In this paper, electrification of the Environmental Control System (ECS), which is used for cabin pressurization and electronic devices cooling, is analyzed. The objective is to develop a calculation method which allows to study the impact of ECS electrification on the aircraft mission performance, by taking into account the ambient air extraction impact on the aircraft drag. The method can be used at early design, for a complete aircraft mission, and is based on penalty analysis methods to convert the system performance impacts into fuel weight delta. In this paper a conventional and a fully electrified architecture are compared for a short-medium range aircraft. While the electrical ECS architecture is shown to be more advantageous with respect to the engine performance alone, preliminary studies using the presented method indicate that a conventional ECS architecture is more adapted regarding the overall aircraft mission fuel performance.
Authors Lembo Giuseppe (coord), Giuseppe Scarcella, Evelina Sabatella, Nedo Vrgoč, Isabella Bitet... more Authors Lembo Giuseppe (coord), Giuseppe Scarcella, Evelina Sabatella, Nedo Vrgoč, Isabella Bitetto, Maria Teresa Facchini, Monica Gambino, Aleksandar Joksimovic, Vanja Cikes Kec, Jerina Kolitari, Roland Kristo, Bojan Marčeta, Olivera Marković, Edvard Avdič Mravlje, Ana Pešić, Dario Pinello, Rosaria Sabatella, Alberto Santojanni, Barbara Zorica and Maria Teresa Spedicato. SEDAF Final Report, 2015. 148 pp.
Semi-enclosed bays are generally considered important environmental resources for mariculture. Th... more Semi-enclosed bays are generally considered important environmental resources for mariculture. This study was conducted within cage fish farms in two semi-enclosed bays of the Eastern Adriatic Sea, at Boka Kotorska Bay (Montenegro), and at Mali Ston Bay (Croatia). A total of 16 sea water samples, and 46 swabs from the gills and skin of European seabass were collected from two sea bass farms during two samplings in autumn and spring. The aim of this study was to determine the health status of European seabass in Montenegro and Croatia, to evaluate the environmental conditions in both farming areas, and to assess the presence of Vibrio and its impact on fish health. Most of the isolated bacteria from the samples were Gram-negative and comprised of Vibrio, Photobacterium and Pseudomonas genera. Assessment of fish health status showed that fish were clinically healthy and results present a bacterial community associated with healthy farmed European seabass. At the same time, some of the...
Mediterranean Marine Science, 2018
The main aim of the present study is to increase the knowledge on the seasonal dynamics of the se... more The main aim of the present study is to increase the knowledge on the seasonal dynamics of the set gears used by Adriatic small-scale fisheries (SSFs) through the collation of data (landings, fishing effort, composition of catches, length-frequency distributions of target species and economic value of landings) on target species,. The study focused on the three set gears mainly used in the basin: gillnets, trammel nets and traps. The results confirmed that SSFs are diverse, complex and dynamic, representing an economic and social engine and providing seafood and employment to local economies. In the Adriatic Sea, SSFs exploit coastal fishing grounds where the seasonal fluctuations of the physical and chemical parameters of the water column strongly influence the occurrence of the different species. Because of this, many different types of set gears are currently used to catch a pool of target species over the year. Fishermen use more than one set gear during the year and tend to inc...
12th European Conference on Turbomachinery Fluid Dynamics and hermodynamics, 2017
The objective of this paper is development and application of a methodology for preliminary analy... more The objective of this paper is development and application of a methodology for preliminary analysis of variable pitch fan (VPF), both as a separate component and as a module integrated into a short-medium range geared turbofan engine developed within European FP7 project ENOVAL. For this purpose, a high bypass ratio two spool geared turbofan engine model was constructed in software PROOSIS. A VPF performance modelling methodology was then developed using 3D steady RANS CFD produced fan maps as baseline; the CFD maps characterised five discrete fan pitch angle settings. In order to represent those maps in PROOSIS and add the pitch angle as a degree of freedom, they were transformed into the Map Fitting Tool (MFT) reference frame. Once the complete VPF turbofan model was in place, engine mission optimisation experiments were carried out. The resulting performance is characterised by a good capability to control the fan surge margin, without degrading the engine fuel consumption.
Mediterranean Marine Science, 2020
The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains over 3000 records (mo... more The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains over 3000 records (more than 4000 individuals) of large elasmobranch species from 20 different countries around the Mediterranean and Black seas, observed from 1666 to 2017. The main species included in the archive are the devil fish (1 813 individuals), the basking shark (939 individuals), the blue shark (585 individuals) and the great white shark (337 individuals).In the last decades other species such as the shortfin mako (166 individuals), the spiny butterfly ray (138) and the thresher shark (174 individuals) were reported with an increasing frequency. This was possibly due to an increased public awareness on the conservation status of sharks, and a consequent development of new monitoring programmes. MEDLEM does not have a homogeneous reporting coverage throughout the Mediterranean and Black seas and it should be considered as a database of observed species presence. Scientific monitoring efforts in the...
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Papers by Aleksandar Joksimovic