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Parameter-dependent fractal spectra in quasiperiodic metastructures with elastic and rigid segments
No full textPeriodic structures exhibit unique dynamic behaviors that are strongly
influenced by their structural organization. The structural periodicity
leads to wave phenomena similar to those in crystallography,
including Bragg scattering and band gap formation. These engineered
systems, known as metastructures, allow enhanced control over
mechanical wave propagation and have been widely studied for
applications such as vibration suppression, energy harvesting, and
non-invasive testing. By carefully designing and tessellating unit
cells, advanced effects can be achieved. Notably, these dynamic
phenomena remain robust despite small structural irregularities. This
robustness enables the introduction of deterministic disorder through
controlled variations in design parameters, creating quasiperiodic
structures. Such systems often show spatial localization of vibrational
modes, confining energy to specific regions. This tunable behavior
supports the development of intelligent structures, offering innovative
solutions in various engineering domains.No. 451-03- 137/2025-03/200105 from 4.2.2025
COMPOSITE MATERIALS IN GEAR DESIGN
No full textComposite materials, known for their high strength to weight ratio, corrosion resistance, and enhanced mechanical properties, are increasingly being employed in various high performance appli cations. This review examines the state of the art developments in composite gear design, focusing on the types of composites uti lized and their applicability for high stress and high strain loading conditions. The aim is to provide a comprehensive understanding of the material properties, manufacturing techniques, and performance outcomes associated with composite gears. Composite materials have revolutionized gear design, particularly in applications involving high strain and high stress, such as power transmission systems. The application of
composites in gear design offers significant advantages, including enhanced strength to weight ratios,
improved fatigue resistance, and superior wear properties. This pape r also focuses on the possibility of
certification analysis of advanced composite gears subjected to high loads. The primary objective is to
enhance simulation tools and numerical and experimental methods, facilitating the design of lighter, safer, and
mor e energy efficient structures. Additionally, the research aims to support and prepare the necessary
standardization steps for the certification of composite structures, including gear transmissions made of
composite materialsGrant number: 451 03 137/2025 03/ 20010
Metaheuristic search algorithm hyperparameter tuning for simulation-based engineering optimization tasks
No full textRegardless of how the objective function behaves, metaheuristic search techniques can be used to approach the optimal solution; however, task-specific hyperparameter selection is required. The computational cost of the simulation-based objective function evaluation makes it impossible to solve this process in time. Artificial intelligence tools can be used to increase automation and decrease the amount of time needed for engineering optimization tasks. The developed procedure can reduce uncertainty and increase the design cycle's efficiency, which together accelerate innovation.XXXIII. Nemzetközi Gépészeti Konferencia – OGÉT 202
Enhanced osmotic vacuum dryer for fruits and vegetables
No full textThis paper presents an innovative osmotic vacuum drying system designed to improve the efficiency and quality of fruit and vegetable dehydration. Traditional atmospheric pressure dryers using heated air streams are often inefficient due to high energy consumption and limited operational periods during harvest seasons. Additionally, inadequate temperature and humidity control in conventional dryers can lead to product defects such as surface hardening, incomplete dehydration, or microbial spoilage. The proposed osmotic vacuum dryer addresses these challenges by integrating controlled osmotic dehydration with vacuum drying, ensuring better moisture removal while preserving organoleptic properties. This approach enhances energy efficiency, reduces drying time, and minimizes product deterioration. The study highlights key design features, operational advantages, and potential applications of this technology in the food industry.No. 451-03-137/2025-03/200105, dated February 4, 202
THE TECHNICAL DRAWING TOOLS IN THE LEGACY OF NIKOLA TESLA
No full textThe legacy of Nikola Tesla contains numerous archival documents, monographic and serial publications, newspaper clippings, as well as personal and technical items. It includes thirteen specimens of technical drawing tools and some correspondence with the manufacturers. The tools were acquired and used by the famous scientist, engineer and inventor to produce technical documentation while designing and constructing numerous machines and devices in various areas of his creative efforts. The aim of this work is to analyze the original drawing tools preserved in the Nikola Tesla Museum in Belgrade, to inspect the corresponding catalogs, and to present a brief history of the relevant manufacturers.Contracts No. 451-03-137/2025-03/200105 and No. 451-03-136/2025-03/20013
Ecology materials in the context of sustainable strategies and optimal resources management
No full textThe integration of ecological materials into sustainable strategies and resources management represents a fundamental approach towards environmental preservation and efficient utilization of natural and processed resources on the Globe. Ecological materials, characterized by minimal environmental footprint, recyclability, and renewability, enable implementation of circular economy principles in construction, industry, and everyday life. Their use contributes to reducing pollution, lowering energy consumption in production processes, and extending the lifecycle of products through reuse and recycling. This paper analyzes key aspects of the reuse of materials, with a focus on management strategies that ensure sustainable ecology material flows within economic systems. In particular, the role of management in designing policies that promote the transition from linear to circular models is emphasized. Sustainable strategies must include life cycle assessment (LCA) and eco-design to minimize negative impacts on ecosystems while maintaining economic competitiveness. Moreover, the selection of ecological materials affects the quality of life and health of the population, aligning environmental and social objectives with economic development goals. The results of the analysis conducted in this paper indicates that successful integration of ecological materials into resources management requires cooperation of researchers, producers, consumers, and policymakers, as well as education that raises awareness about environmental protection and responsible material use. Implementing these approaches contributes to building a resilient society based on sustainability, circular economy, and optimal resources management.Contract number: 451-03-136/2025-03/ 20021
A TECHNICAL SOLUTION FOR THE AUTOMATIC APPLICATION OF LIQUID STARTER FERTILIZER DURING MAIZE SOWING
No full textGlobal research has consistently demonstrated that the proper use of
fertilizers in maize production technology can substantially increase grain yield. Among
recent advancements in sowing techniques is the integration of operations that allow
the simultaneous application of specialized mineral fertilizers, particularly liquid starter
fertilizers. This paper introduces a novel conceptual design of the EUKU-01 technical
system, which, when implemented on a standard pneumatic seeder, enables the automated
delivery of liquid starter fertilizer in parallel with maize sowing. The system employs
an innovative approach that facilitates the application of fertilizer in predefined modes
(point or band placement) and adjustable quantities (1–250 l ha-1), either directly onto
the seed or in its immediate proximity. Activation is achieved through photoelectric
sensors that detect seed passage, generating a signal transmitted to the electronic control
unit (ECU). The ECU subsequently regulates the operation of nozzles mounted on
additional furrow openers. Detailed technical specifications of the system’s components,
the ECU schematic, and the overall operational principle are presented. The EUKU-01
system demonstrates the potential to enhance maize production through the innovative
integration of electronic and mechanical components, offering a significant contribution
to reducing production costs and improving yield outcomes.
The abstract should summarize the contents of the paper in short terms, up to
500 words.contract registration number: 451-03-137/2025-03/20010
Experimental Analysis of the Deformation and Failure of a Composite Drone Arm
No full textThis paper presents an experimental analysis of the strength of a composite drone arm. The use of composite materials is widespread in the aerospace industry, especially in designing and manufacturing unmanned aerial vehicles (UAVs). The main reason is the need to reduce the UAV’s mass without damaging the structure. Due to their characteristics, composite materials enable the structure to be lighter than it would be if it were made of conventional materials (duralumin, etc.), while at the same time the strength parameters are adequate. Experimental analysis is usually used when it is necessary to check and verify values previously obtained by analytical and numerical methods. In this paper, we first perform an experimental analysis to find the maximum value of force at which cracks will occur. The value of the obtained force will help us in further numerical analyses to optimize the structure
Error bounds of positive interpolatory quadrature rules for functions analytic on ellipses
No full textaccording to Contract 451-03-137/2025-03/200105 dated on February 4, 202
ВКЛАД РУССКИХ ПРОФЕССОРОВ-ЭМИГРАНТОВ В РАЗВИТИЕ МЕХАНИКИ И МАШИНОСТРОЕНИЯ В СЕРБИИ
No full textРассмотрены биографии двух поколений профессоров-эмигрантов из царской России, преподававших механику и различные области машиностроения в Белградском университете. В основном они взяты из историй факультета машиностроения Белградского университета и Сербского общества механики , изданных к их важным юбилеям, и дополнены данными из доступных исторических источников. Показан и детализирован огромный вклад русских профессоров в развитие механики и машиностроения в Белграде