154 research outputs found
Outline design of compact GNC module for missile flight control purposes
Da bi se obezbedilo da voÄeni projektil bide u moguÄnosti da prati unapred zadatu putanju leta velika koliÄina sofisticirane opreme mora da bude ukljuÄena u to. Sa praktiÄne taÄke glediÅ”ta i ako to konstrukcija projektila dozvoljava, neophodni podsistemi koji moraju da budu koriÅ”Äeni za upravljanje letom projektila trebalo bi da budu zasebna celina (jedan segment / modul projektila). Ukoliko je to prihvatljiv koncept, dva problema treba da budu reÅ”ena tokom projektovanja: postizanje zadovoljavajuÄeg odnosa izmeÄu korisnog tereta (bojeva glava) i ukupne težine projektila (ukljuÄujuÄi odgovarajuÄe podsisteme za voÄenje, navigaciju i upravljanje) i minimizacija / optimizacija iskoriÅ”Äenog prostora. Koncepcija kompaktnog modula za voÄenje /engl.: Guidance/, navigaciju /engl.: Navigation/ i upravljanje /engl. Control/ (skraÄeno: GNC modul) koji se sastoji od pomenutih podsistema je prezentovana u ovom radu.To ensure that the guided rocket missile could be in position to follow predefined flight trajectory, a lot of very sophisticated equipment has to be involved in. From a practical point of view and if the general design of the missile allows that, the necessary subsystems to be used in missile flight control purposes have to be assembled as a separate whole (one segment /module of the missile). If this concept is acceptable, two problems have to be solved during the designing: achieving of the satisfactory ratio between load capacity (warhead) and total weight of the missile (that includes the appropriate subsystems for guidance, navigation and control of the missile too) and minimization /optimization of the used space. The outline design of compact Guidance, Navigation and Control Module (short: GNC Module) which consists of the subsystems mentioned before is presented in this paper
Forensic analysis of bone in Regio antebrachii of deer (Capreolus capreolus) and sheep (Ovis aries) in order to determine origin of animal species
There are frequent cases of poaching in which it is necessary to determine to
which animal species the prey belonged on the basis of morphological
characteristics of the bone. In this case, the Department of Forensic
Medicine received material for giving an expert opinion on the left and right
forearm (radius and ulna) and twelve pieces of the ribs. The ribs were
completely broken, so in order to identify the bones as belonging to a
particular animal species, only the radius and ulna were used. Forensic
analysis was perfomed by comparing the osteological features of the delivered
bones with those of museum specimens of deer and sheep bones. The forearm
(ossa antebrachii) of the deer is slender and thin, and it is massive and
heavier in sheep. There are two interosseus spaces (spatium interosseum
antebrachii) of the forearm in the deer and only one in the sheep. The
olecranon tuber (tuber olecrani) of the sheep is triangular in shape, and in
deer it is divided into cranial and caudal prominences. The radial tuberosity
(tuberositas radii) of the sheep is better defined. Based on morphological
characteristics of the disputed bones we found that the submitted material
originated from a doe
Outline design of compact GNC module for missile flight control purposes
Da bi se obezbedilo da voÄeni projektil bide u moguÄnosti da prati unapred zadatu putanju leta velika koliÄina sofisticirane opreme mora da bude ukljuÄena u to. Sa praktiÄne taÄke glediÅ”ta i ako to konstrukcija projektila dozvoljava, neophodni podsistemi koji moraju da budu koriÅ”Äeni za upravljanje letom projektila trebalo bi da budu zasebna celina (jedan segment / modul projektila). Ukoliko je to prihvatljiv koncept, dva problema treba da budu reÅ”ena tokom projektovanja: postizanje zadovoljavajuÄeg odnosa izmeÄu korisnog tereta (bojeva glava) i ukupne težine projektila (ukljuÄujuÄi odgovarajuÄe podsisteme za voÄenje, navigaciju i upravljanje) i minimizacija / optimizacija iskoriÅ”Äenog prostora. Koncepcija kompaktnog modula za voÄenje /engl.: Guidance/, navigaciju /engl.: Navigation/ i upravljanje /engl. Control/ (skraÄeno: GNC modul) koji se sastoji od pomenutih podsistema je prezentovana u ovom radu.To ensure that the guided rocket missile could be in position to follow predefined flight trajectory, a lot of very sophisticated equipment has to be involved in. From a practical point of view and if the general design of the missile allows that, the necessary subsystems to be used in missile flight control purposes have to be assembled as a separate whole (one segment /module of the missile). If this concept is acceptable, two problems have to be solved during the designing: achieving of the satisfactory ratio between load capacity (warhead) and total weight of the missile (that includes the appropriate subsystems for guidance, navigation and control of the missile too) and minimization /optimization of the used space. The outline design of compact Guidance, Navigation and Control Module (short: GNC Module) which consists of the subsystems mentioned before is presented in this paper
Dynamic Behaviour of a Two-Stage Cycloidal Speed Reducer of a New Design Concept
Traditional cycloidal speed reducers (with two cycloid discs per one stage, mutually turned by an angle of 180Ā°) are well known for their remarkable dynamic stability. This paper analyses dynamic behaviour of a two-stage cycloidal speed reducer of a new concept, in which only one cycloid disc is used for each stage in order to further enhance its compactness. Lagrangeās displacement equations have been used to develop independent dynamic models for both the first and the second stage (six degrees of displacement freedom for the first stage, and eight degrees of displacement freedom for the second stage). A normal force acting at the contact of the cycloid disc teeth and the corresponding ring gear roller has been taken as an excitation force. For the newly designed two-stage cycloidal speed reducer, systems of differential displacement equations of the first and second stage have been solved using the Matlab ā Simulink software package. A comprehensive analysis of the obtained diagrams of elastic dynamic contact forces of the first and second stage has revealed a certain analogy. In terms of dynamics, the cycloid disc of the second stage behaves similarly to the cycloid disc of the first stage. Since these cycloid discs are mutually turned by an angle of 180Ā°, it can be concluded that from the aspect of the cycloid disc load, the two-stage cycloidal speed reducer of a new design concept exhibits good dynamic balance and stability
Analysis of various impacts on energy consumption of electric vehicles
Due to the predicted increase of electric vehicle worldwide market share, it is very important to analyse the energy consumption and the factors affecting it. The results of the research can contribute to a better understanding of the energy resources needed and vehicle autonomy, and also to the education of drivers and potential users. This paper deals with the analysis of various factors that influence the energy consumption in electric vehicles and the examination of mathematical model, developed to predict the autonomy of such vehicles. In addition to environmental, road and vehicle design factors, the influence of the driver on the energy consumption is also considered. Based on the conducted analysis, appropriate conclusions are drawn and a proposal for future research is given.Zbog predviÄenog porasta broja elektrovozila na svetskom tržiÅ”tu, od velikog je znaÄaja analizirati potroÅ”nju energije i faktore koji na nju utiÄu. Rezultati istraživanja mogu doprineti sagledavanju potrebnih energetskih resursa i realne autonomije kretanja vozila, kao i edukaciji vozaÄa i potencijalnih korisnika. Ovaj rad se bavi analizom razliÄitih faktora koji utiÄu na potroÅ”nju energije kod elektrovozila i sagledavanjem matematiÄkog modela, razvijenog u cilju predviÄanja autonomije kretanja. Pored uticaja okoline, uslova puta i konstrukcionih karakteristika vozila, razmatran je i uticaj vozaÄa na potroÅ”nju energije. Na osnovu sprovedene analize izvedeni su odgovarajuÄi zakljuÄci i dat je predlog za buduÄa istraživanja
Impact of the damper characteristics on the behavior of suspension system and the whole vehicle
Damper asymmetry is a phenomenon for which there is no confirmed explanation in the literature, although it is present in almost all variants of telescopic dampers. This paper analyzes the influence of various characteristics of dampers, both symmetrical and asymmetrical, on the behavior of the suspension system and the whole vehicle. Different tests have been carried out, and they simulate the different types of vehicle movement that are present in exploitation. The simulation was performed in CarSim 8 software package for the vehicle with chosen characteristics. Appropriate conclusions were drawn on the basis of the conducted research, i.e. the differences in the behavior of the suspension system and the vehicle depending on the selected characteristics of the damper are shown
Correction: A. Hepatica in European ground squirrel (Citellus citellus) compared to other experimental animals (2016, vol. 70, iss. 1-2, pp. 31-39)
The Editor-in-Chief has been informed that authors of above-referenced article made a corrigendum to it. The article should include the following reference at the end of section Introduction (Blagojevic i sar., 2015). Also, at the section Literature following reference should be stated in full: BlagojeviÄ MiloÅ”, VitoroviÄ DuÅ”ko, AdamoviÄ Ivana, NeÅ”iÄ Ivana, BrkiÄ Zlata, ZdravkoviÄ Marija, ÄorÄeviÄ Milena, JoviÄ Slavoljub, ZoriÄ Zoran, ÄupiÄ Dejana, Vascularization of the kidney of the ground squirrel (Citellus citellus) in comparison with other experimental animals.
Impact of the damper characteristics on the behavior of suspension system and the whole vehicle
Damper asymmetry is a phenomenon for which there is no confirmed explanation in the literature, although it is present in almost all variants of telescopic dampers. This paper analyzes the influence of various characteristics of dampers, both symmetrical and asymmetrical, on the behavior of the suspension system and the whole vehicle. Different tests have been carried out, and they simulate the different types of vehicle movement that are present in exploitation. The simulation was performed in CarSim 8 software package for the vehicle with chosen characteristics. Appropriate conclusions were drawn on the basis of the conducted research, i.e. the differences in the behavior of the suspension system and the vehicle depending on the selected characteristics of the damper are shown
Developing self-modifying code model
This paper presents the technology of constructing and linearization of binary program utilized for program generation, analysis and transformation into a self-modifying code. An example model of the self-modifying software system and its experimental application in vehicle control have been presented in this paper. The module responsible for vehicle control comprising two subsystems has been created within the simulation software. The first subsystem has emerged through the classical software process developed by a human-programmer. The second subsystem has been created as a result of a separate piece of software substituting the part of a programmer in a software process part. The result of this approach is software creation in conjunction with natural and Artificial Intel- ligence in addition to experimental integration into the vehicle control system
Developing self-modifying code model
This paper presents the technology of constructing and linearization of binary program utilized for program generation, analysis and transformation into a self-modifying code. An example model of the self-modifying software system and its experimental application in vehicle control have been presented in this paper. The module responsible for vehicle control comprising two subsystems has been created within the simulation software. The first subsystem has emerged through the classical software process developed by a human-programmer. The second subsystem has been created as a result of a separate piece of software substituting the part of a programmer in a software process part. The result of this approach is software creation in conjunction with natural and Artificial Intel- ligence in addition to experimental integration into the vehicle control system
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