Machinery - Repository of the Faculty of Mechanical Engineering, University of Belgrade
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POSSIBILLITIES FOR INCREASING EFFICIENCY OF MILLING PLANT OPERATION FOR THE PURPOSE OF OPTIMIZING COMBUSTION PROCESS WITHIN POWER STEAM BOILER
No full textDuring retrofits taken on power unit “Nikola Tesla” A6 in 2011 for the purpose of increasing its overall production capacity certain modifications on milling plants have been applied. Enlargement of power steam boiler production capacities included increase in milling plant output with existing number of mills in operation. Changes made on arrangement of pulverized coal burners, geometry of mill gaseous mixture distribution elements inside mill gaseous mixture duct as well as operational rotational speed of mill impeller led to increase of milling capacity to the certain extent. Consequently, applied modifications resulted in higher primary air flow required for the purpose of regulating mill gaseous mixture temperature, thus, reducing secondary airflow in burners below recommended level which affected combustion process within boiler furnace. In this paper results of thermal calculations of power steam boiler and aerodynamic calculations of milling plant for the present operating conditions have been presented. Calculations results have been validated by use of measurements taken on site in present operating conditions. Impact on overall boiler operation made by modifications taken on milling plants has been discussed in details. In text new measures, which would reduce occurred negative effects, have been proposed. Positive effects of proposed measures, as new operating point of milling plant, are confirmed by the results of additionally performed thermal and aerodynamic calculations given in this paper
BOOK OF ABSTRACTS ADDRESSING CHALLENGES IN APPLIED MECHANICS THROUGH ARTIFICIAL INTELLIGENCE APPLICATIONS
No full textPREFACE
It is our great honor and pleasure to welcome you to the 650th EUROMECH Colloquium, entitled "Addressing Challenges in Applied Mechanics through Artificial Intelligence Applications", held in Belgrade, Serbia, from August 27 to 29, 2025.
This Colloquium marks a significant milestone, the first-ever EUROMECH event organized in our region and as such, represents a unique opportunity to set the stage for future scientific developments at the intersection of applied mechanics and artificial intelligence. The Colloquium brings together distinguished experts and early-career researchers from over fifteen countries, including Austria, Bosnia and Herzegovina, Bulgaria, Canada, China, the Czech Republic, Germany, Greece, Hungary, Iceland, North Macedonia, Poland, Slovenia, the United Kingdom, the United States and others. This international participation fosters a vibrant and collaborative atmosphere for scientific exchange and innovation.
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Fuzzy Lyapunov Approach for Adaptive System Control
No full textFor the efficient speed control of DC motors, this paper combines
Model Reference Adaptive Control (MRAC) and Fuzzy Logic (FL).
The proposed approach ensures stability and good system performance
for various desired speeds and undesired disturbances
Thermal imaging spectrometry and thermographic snapshots for three building blocks of different ages
No full textThermograms and their interpretation are a very customary routine in finding building
construction flaws. Infrared thermography has been used in building diagnostics for
approximately four decades now. These hand-held instruments dated from the 1800th
year, but their successive use started in the 1990s. In this manuscript, three differently
aged building blocks, (one from 1974th, the other from 2000th, and up-last from 2019th
year) were thermographically monitored and analyzed. For the thermographic
surveillance of these three differently aged building blocks, was used a Chinese-branded
thermal imaging camera, Guide D384A. The thermodynamic assessments of the
thermograms were done and according to the building's physics postulates, analytical
interpretations were made. Each building type had a resume of conclusions regarding the
construction drawbacks and quality of the construction. The relationship between the
architectural form of the building and the typology of thermograms was established. As
an appendix to this manuscript served the quantitative allegations of heat radiation
Thermal imaging spectrometry and thermographic snapshots for three building blocks of different ages
No full textThermograms and their interpretation are a very customary routine in finding building
construction flaws. Infrared thermography has been used in building diagnostics for
approximately four decades now. These hand-held instruments dated from the 1800th
year, but their successive use started in the 1990s. In this manuscript, three differently
aged building blocks, (one from 1974th, the other from 2000th, and up-last from 2019th
year) were thermographically monitored and analyzed. For the thermographic
surveillance of these three differently aged building blocks, was used a Chinese-branded
thermal imaging camera, Guide D384A. The thermodynamic assessments of the
thermograms were done and according to the building’s physics postulates, analytical
interpretations were made. Each building type had a resume of conclusions regarding the
construction drawbacks and quality of the construction. The relationship between the
architectural form of the building and the typology of thermograms was established. As
an appendix to this manuscript served the quantitative allegations of heat radiation.BOOK OF ABSTRACT
Uređaj za prihvatanje semena drveća
No full textUređaj za prihvatanje semena drveća je namenjen primeni u semenskim objektima. Sastoji se od parova ploča (1), povezanih šarkama (2), koji se spojnicama (3) i vijcima s navojnim maticama (4) postavljaju oko stabla u vidu prstena.Patent RS 1835 U1 je objavljen u Glasniku intelektualne svojine br. 25/1. Spis malog patenta je priložen, a ovde je i link: http://pub.zis.gov.rs/rs-pubserver/pdf-document?PN=RS1835%20RS%201835&iDocId=105702&iepatc
PROGRAMMING AND VERIFICATION OF MILLING OPERATIONS FOR CNC MACHINES WITH HORIZONTAL ROTARY AXIS
No full textThe paper analyses the programming of CNC milling machines with horizontal rotary axis. These
are usually machines for rapid prototyping of rotating symmetrical and/or asymmetrical parts. The paper analyses the available programming software, which can be one of the standard CAD/CAM systems or a specialized CAM system. In addition to the analysis of the programming method procedure, the verification of the program by simulating the removal of material and simulating the operation of a virtual machine according to a given program was also considered. Verification of programming methods was realized by machining several characteristic parts, on developed 3-axis desktop CNC milling machine - Multiprodesk, that has two translational and one horizontal rotary axis.Conference proceedings [Elektronski izvor] : 60th Anniversary of the Association of Production Engineering of Serbia
/ 40th International Conference of Production Engineering ICPES 2025 - Serbia 2025, Nis, Serbia, 18th - 19th
CIP - Каталогизација у публикацији
Народна библиотека Србије, Београд
621.7/.9(082)(0.034.2)
621.7/.9:669(082)(0.034.2)
681.5(082)(0.034.2)
005.6(082)(0.034.2)
004.896(082)(0.034.2
Application of 2D and 3D Digital Image Correlation in Biomedical Material and Structure Testing
No full textDigital Image Correlation (DIC) is an advanced non-contact optical method extensively utilized for
full-field strain measurement. This study presents several distinct applications of both 2D and 3D
DIC techniques in the field of biomedicine. Specifically, the research highlights the efficiency of
DIC methods in the precise mechanical evaluation of dental materials, providing essential insights
into their deformation behavior under clinical-relevant loads. The paper evaluates their mechanical
performance and identifying deformation patterns that are critical for predicting functional stability
and reliability. Additionally, 3D DIC has been successfully implemented for monitoring real dental
and biomedical structures (e.g. dental and hip implants), demonstrating the method’s potential in
detecting early signs of material deterioration and structural failure. The results underscore the
versatility and precision of 2D and 3D DIC methods, reinforcing their indispensable role in
advancing material testing and facilitating the development of robust structures for various
biomedical engineering applications
Influence of welding parameters on the geometric characteristics of surface weld metal obtained by handheld laser welding
No full textThe handheld laser welding process is the latest innovation in welding technology with an increasingly broad range of applications primarily due to the simplicity of the welder training, the minimal influence of the welder on joint quality, low heat input, high welding speed, and lower equipment costs. In this paper, the influence of selected welding parameters (wire feed rate and laser oscillation width) on the geo-metric characteristics of surface welds on low-carbon steel P235GH is presented. Additionally, based on the selected optimal parameters, a butt joint is performed by welding plates made of the same base material. The dependence of these parameters on weld metal width and weld metal reinforcement is determined. Furthermore, it is concluded that use of a higher power device would most likely be successful in a complete root penetration during butt welding
A comparative study on the tensile properties of 3D printed ABS filament and resin: Effects of aging
No full textThis study investigates the effects of environmental aging on the tensile properties of 3D printed specimens using Fused Deposition Modelling (FDM), Stereolithography (SLA) and Digital Light Processing (DLP) technologies. Specimens are printed from Acrylonitrile Butadiene Styrene (ABS) filament and ABS-based resin. Tensile testing is conducted on samples directly after printing and then following aging periods of one month and two months in a controlled environment (23 °C, 55 % RH). Statistical analysis is performed using ANOVA to evaluate the influence of the printing method, material type, and aging time on tensile strength, Young’s modulus, and elongation at break. The tensile performance of FDM-printed specimens generally decreases over time, which is evident from the comparative analysis. Specimens aged for two months exhibit significantly reduced tensile strength compared to both unaged and one-month aged SLA specimens. Interestingly, one-month aged specimens show a slight improvement in tensile performance com-pared to unaged samples which is an unexpected outcome. On the other hand, DLP specimens display a clear sensitivity to the aging process, with a marked degradation in performance when subjected to tensile load over time. This highlights a lack of tolerance to aging in DLP 3D printed materials under mechanical stress.contract no. 451-03-136/2025-03/20010