Acta Mechanica Slovaca - Latest articles
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Design of a Device for Recycling Metal Hydride Alloys Prior to Melting
Peter Čurma, Marián Lázár, Natália Jasminská, Peter Milenovský
Acta Mechanica Slovaca 2025, 29(2):54-58 | DOI: 10.21496/ams.2025.019 
The present article deals with the recycling of metal hydride alloys, as part of the melting process, conducted with the use of a newly-designed prototype device. Individual induction heating parameters that affect the efficiency of the process of melting metal hydride alloys are analysed. The induction heating method, its effects on the melted metal hydride alloy, and potential optimisation of the recycling process are analysed in detail. The article also presents specific designs of the induction heating apparatus, including a crucible. The construction of the oscillator module, the source module, and the water-cooling module that are required for...
Using a WEB-camera to Measure the Displacement of the Measuring Mark on a Rotating Object
Oleksandr Gorshenin
Acta Mechanica Slovaca 2025, 29(2):46-53 | DOI: 10.21496/ams.2025.013
This paper provides a scientific justification for the potential to achieve a specified accuracy in measuring the spatial position of a tracking mark on a controlled rotating object using data from a cost-effective video camera. We conduct an error analysis of the displacement measurements of the tracking marker between consecutive frames in a video stream. A mathematical model is proposed to estimate the root mean square (RMS) error in the displacement of the marker within the image plane for a remote, non-contact position measurement sensor. This model accounts for camera parameters, marker characteristics, lighting conditions, and image distortions...
Tortuosity Decoder as a Tool for Evaluating Tramway Overhead Contact Line Parameters
Peter Onderčo, Jan Rybář, Jozef Leja, Sohaibullah Zarghoon
Acta Mechanica Slovaca 2025, 29(2):38-44 | DOI: 10.21496/ams.2025.018
This paper describes a tortuosity decoder used to measure the parameters of overhead contact lines for tram systems. The decoder is integrated into the pantograph of the measuring tram operated by Dopravný podnik Bratislava, a. s. (Bratislava Transport Company). Its primary function is to assess the tortuosity of the overhead contact lines, which is linked to the wear of carbon strips on trams. Additionally, it monitors the stable and reliable contact between the pantograph and the overhead contact line. This measurement is crucial for ensuring the smooth operation of urban public transport, directly impacting the quality of services and overall transportation...
Effect of Mechanical Activation Frequency on the Reactivity of Phosphate Rock Mixtures in an Impact Mill
Maksym Skydanenko, Ruslan Ostroha, Jozef Bocko, Mykola Yukhymenko, Iryna Vaskina, Hynek Roubík
Acta Mechanica Slovaca 2025, 29(2):32-37 | DOI: 10.21496/ams.2025.020
This article presents the results of an experimental investigation into the mechanical activation of a phosphate rock mixture using a single-rotor impact activator. The key indicators used to assess the effectiveness of activation were the content of water-soluble P2O5 and the heat of dissolution of phosphorite in hydrochloric acid. The obtained graphical data illustrate a clear improvement in these parameters with increasing rotational speed and frequency of mechanical impacts on the material particles. Analysis of the results revealed that both the content of accessible P2O5 and the heat of phosphorite dissolution increased by approximately 15-20%...
Enhancing Residual Stress Mitigation in SLM-Fabricated Ti6Al4V Through Process Parameter Optimization and Remelting Techniques
Marek Gazda, Jiří Hajnyš, Akash Nag, Jana Petrů, Quoc-Phu Ma
Acta Mechanica Slovaca 2025, 29(2):26-31 | DOI: 10.21496/ams.2025.016
This study investigates the reduction of residual stresses in Ti6Al4V parts produced via Selective Laser Melting (SLM) by optimizing process parameters and incorporating remelting techniques. The effects of laser power, scanning speed, hatch distance, and remelting cycles were analysed using bridge-shaped samples and deformation angle measurements. The Design of Experiment (DoE) study with Taguchi method was utilized to optimize the number of parameter combinations, effectively reducing the number of required experiments. In addition, a modified Volumetric Energy Density (VED) formula accounting for remelting cycles was proposed to provide deeper insights...
EHS Data Integration into Production Monitoring Tools
Peter Krajny, Jaroslava Janekova
Acta Mechanica Slovaca 2025, 29(2):20-25 | DOI: 10.21496/ams.2025.014
With the rapid advancement of digitalization, data modeling and management have become increasingly significant. This study explores the digitization of diverse data types and their interconnection within a real-world automotive manufacturing environment. The proposed framework integrates two independent online applications: one responsible for collecting and processing production data and the other designed to assess ergonomic conditions at workstations. The study examines the feasibility of linking these systems, enabling continuous monitoring of operator workload. This integration aims to mitigate occupational health risks and evaluate how ergonomic...
CNC Machine Tool Accuracy and Repeatability Measurement Strategy: Analysis and Statistical Evaluation
Michal Holub, Adam Jelinek, Tomas Marek, Jiri Marek, Vojtech Frkal
Acta Mechanica Slovaca 2025, 29(2):14-19 | DOI: 10.21496/ams.2025.017
Several factors can affect the accuracy and repeatability results of CNC machine tool positioning. One of the factors is to set up a measurement strategy for both linear and rotary axes based on standards such as ISO 230-2:2014 and VDI 3441. Measurement procedures (strategies) can be modified according to the purpose of the measurement, such as for a quick assessment of the current state of the linear axis, or a more time-consuming measurement to increase the accuracy of the linear axis. They can also be measurements designed for various diagnostic purposes and for better analysis of the measured data. This paper describes modern methods of measuring...
Novel Geometric Shape to Enhance Bending Resistance in Sandwich Panels: Core Optimization
Habib Achache, Rachid Zahi, Bachir Bachir Bouiadjra, Djaafar Ait Kaci, Ali Benouis
Acta Mechanica Slovaca 2025, 29(2):6-13 | DOI: 10.21496/ams.2025.005
The mechanical strength of a sandwich composite material is determined by the interaction between its two outer plates and core structure. This study aims to optimize the geometric and mechanical properties of a sandwich composite through a systematic approach using three-dimensional finite element modeling (FEM) combined with the design of experiments (DOE). Three core geometries (square, hexagon, and square-circle) were evaluated to identify the configuration that maximizes load-bearing capacity while minimizing displacement under stress. Each configuration was tested with various fibre orientations (0°, 45°, and 90°) and composite materials (glass/epoxy,...
Study of Damage in Woven Composite Materials Subjected to Impact
M. Djilali Beida, Habib Achache, Rachid Zahi
Acta Mechanica Slovaca 2025, 29(1):58-62 | DOI: 10.21496/ams.2024.027
This study focuses on modeling the low-velocity impact behaviour of textile-shaped composites. Textile preforms are modeled using Texgen software. Six types of fabrics are considered: Twill (2/2) [0]4, twill (2/2) sequence [0/30/-30/0], twill (2/2) sequence [0/45/-45/0], and plain weave [0]4, plain weave sequence [0/30/-30/0], plain weave sequence [0/45/-45/0]. For the study of fabric damage under impact, the commercial finite element software Ls-dyna is used in transient regime. The "automatic-surface to-surface" approach is employed to model the contact between the impactor and the laminate, while the contact between fibres and the matrix is modeled...
Internet of Things in the Context of Digital Online Revolution in Marketing of Bosch Campaign LikeABosch
Zuzana Dzilská, František Pollák
Acta Mechanica Slovaca 2025, 29(1):50-57 | DOI: 10.21496/ams.2025.012
The Internet of Things (IoT) is fundamentally changing our everyday lives. It contributes to improving the quality and prosperity of life. This study aims to analyse the change that technology brings to daily life and on analysing the IoT marketing media campaign LikeABosch between the years 2019 and 2023 within the geographical territory of Brazil, China, France, Germany, India, UK and USA. The study methodology includes collection of secondary data available at the annual Tech Compass Survey. In 2019 Bosch published a campaign LikeABosch promoting Bosch IoT products. Based on the number of views of the media campaign on youtube.com under the brand...
A Pilot Study on 3D-Printed Impression Trays for Cleft Palate: A Digital Manufacturing Approach
Natália Savková, Branko Štefanovič, Marek Schnitzer, Juraj Bánovčin, Jozef Živčák
Acta Mechanica Slovaca 2025, 29(1):44-48 | DOI: 10.21496/ams.2025.011
Cleft lip and palate (CLP), affect approximately 1 in 756 births and require comprehensive, individualized treatment strategies. Among the first important interventions is the creation of impression trays for nasoalveolar molding (NAM) plates, which help separate the oral and nasal cavities in newborns. However, traditional tray fabrication methods are labour-intensive, imprecise, and unsuitable for mass production. This study investigates the use of reverse engineering and additive manufacturing (3D printing) to streamline and enhance the production of CLP impression trays. Seventeen tray models were digitally designed using 3D scanning and computer-aided...
Influence of Environmental Factors on Sleep Quality: Analyzing Light Exposure and Sleep Duration with Smartwatch Data
Veronika Sedláková, Radovan Hudák, Peter Kneppo, Dominik Hakulin
Acta Mechanica Slovaca 2025, 29(1):36-43 | DOI: 10.21496/ams.2025.010
Artificial lighting significantly influences circadian rhythms and sleep quality. This case study investigates the impact of environmental factors including temperature, relative humidity, CO₂ concentration, total volatile organic compounds (TVOC) and exposure to different light spectra on light sleep duration in a single subject. Sleep data were collected using a Xiaomi Mi Band 6 smart wristband, while environmental parameters were monitored with a custom Arduino-based sensor system. The results indicate that the optimal temperature for light sleep ranges between 17 and 21 °C, with the longest light sleep recorded at approximately 18 °C. Humidity,...
Coupling DRNN with Numerical Simulations for the Thermal Performance Analysis of a Shell-and-Tube Heat Exchanger Using Cu/Water Nanofluid
Bouhelal Guendouz, Hamidou Benzenine, Mohammed Beldjilali, Kaddour Bahram, Rachid Saim
Acta Mechanica Slovaca 2025, 29(1):28-35 | DOI: 10.21496/ams.2025.009
This study investigates the thermal performance of a shell-and-tube heat exchanger, enhanced by using a Cu-water nanofluid on the shell side. A combined experimental and numerical approach was used to assess the effects of varying nanoparticle concentrations (2% to 6%) and cold-side flow rates (0.047 to 4 l/min). At 6% concentration, results showed a temperature increase of up to 7 °C on the shell side, a 12% improvement in thermal efficiency, and a global heat transfer coefficient reaching 8516.87 W, compared to pure water. Additionally, a deep recurrent neural network (DRNN) was implemented to predict key performance indicators: thermal efficiency,...
Detection of Straightness Deviation on a Production Machine in an Automatic Cycle
Artur Zawada, Mateusz Markiefka
Acta Mechanica Slovaca 2025, 29(1):22-27 | DOI: 10.21496/ams.2025.008
The article presents a method of measuring straightness of a metal flat bar on a production machine in an automatic cycle. The measurement was carried out while the production machine was operating, using a laser profilometer. In order to determine straightness, the measurement results were used along the entire length, the maximum deviation was calculated and presented, defining whether the measured part meets production requirements.
Use of Gaming Engines for Robotic Simulations and Computer Vision
Leo Brada, Marek Málik, Erik Prada, Ľubica Miková
Acta Mechanica Slovaca 2025, 29(1):14-20 | DOI: 10.21496/ams.2025.007
Gaming engines have evolved beyond their traditional role in entertainment, becoming powerful tools for robotic simulations and computer vision applications. Their ability to generate high-fidelity, real-time simulations makes them valuable for developing and testing robotic systems in virtual environments. The experiment demonstrated the use of the Unreal Engine, and its computer vision plugin called UnrealCV. A realistic factory environment was created in order to test the capability of the computer vision plugin. The article evaluates UnrealCV and its features along with their potential use in future work. Data from depth cameras are visualized...
Orbital Analysis of a Breathing Cracked Rotor During its Passage Through the Subcritical Speeds
Otmane Zerrouki, Ahmed Fellah, Ahmed Saimi
Acta Mechanica Slovaca 2025, 29(1):6-12 | DOI: 10.21496/ams.2025.006
In the present paper, an orbital analysis is conducted to study the effect of a transverse breathing crack on the orbits of the rotor during its passage through the subcritical speeds; this study makes it possible to predict the presence of cracks in rotors. The classical version of the finite element method is used to model the rotor. While, the equation of motion is obtained by the application of the Lagrange equation on the kinetic and deformation energies of the different components of the rotor taking into account the variation of the shaft's stiffness due to the crack, The results are obtained using a Matlab code based on Newmark's beta method,...
Alternative CAM Solution for Adaptive Robotic Additive Manufacturing
Pavol Štefčák, Ivan Gajdoš, Ján Slota, Jozef Varga
Acta Mechanica Slovaca 2024, 28(4):70-76 | DOI: 10.21496/ams.2025.003
The use of multi-purpose and gantry robots with 5 or more axes in large format additive manufacturing (LFAM) presents many opportunities and challenges. The ability to process large volumes of material and rapidly produce products of significant dimensions requires the formulation of an appropriate manufacturing strategy. This includes setting production parameters and selecting the right software to generate toolpath movements, considering the limitations of the technologies used in many applications as manufacturing of tooling and functional parts, composites or even for repairing of complex surface of parts. Slicing and printing strategies, especially...
Additively Manufactured Auxetic Materials for Healthcare Innovations
Barbara Schürger, Peter Frankovský, Peter Palička
Acta Mechanica Slovaca 2024, 28(4):64-69 | DOI: 10.21496/ams.2025.004
This review explores the mechanical properties, manufacturing techniques, and biomedical applications of auxetic metamaterials. Auxetic materials, characterized by a negative Poisson's ratio, exhibit unique deformation behaviours that make them highly suitable for medical applications such as orthopedic implants, vascular stents, and protective equipment. The study systematically examines recent advancements in the design and additive manufacturing of auxetic structures, focusing on their mechanical performance, durability, and potential for biomedical innovations. Key research findings from experimental and computational studies are summarized to...
Traffic Light Control System
Adhithya Palanisamy Chandrasekaran
Acta Mechanica Slovaca 2024, 28(4):54-62 | DOI: 10.21496/ams.2025.001
The scope of this project is to suggest a proposal in the implementation of traffic light control system based on Programmable Logic Controller (PLC) at a two-way intersection for minimizing the effect of traffic jam such as long waiting time, congestion etc. In this program sensors are used to detect the presence of vehicle at every route, if the presence of vehicle is not detected then the route is omitted form the operation of that cycle. The program also guides a safe context for the pedestrian crossing. The cycle of operation can only be stopped if there is no presence of vehicles at every route or if any two of the four "pedestrian crossing request...
Finite Element Analysis of Hydroxyapatite-Coated Titanium and Steel Hip Implants: Impacts on Stress Redistribution
Ismail Boudjemaa, Omar Khatir, Abdelkader Benkhettou, Atef Hamada, Abderahmene Sahli
Acta Mechanica Slovaca 2024, 28(4):44-52 | DOI: 10.21496/ams.2024.029
This stress redistribution was consistent across both material types, highlighting the coatings' role in enhancing the load-bearing capacity of the implants. Furthermore, titanium implants exhibited lower stress concentrations compared to steel implants, confirming titanium's superior mechanical properties and biocompatibility. These findings suggest that the combination of titanium implants with HA coatings can substantially improve implant durability and performance, providing critical insights for optimizing hip implant designs to enhance patient outcomes. This study employs the Finite Element Method (FEM) to analyse and to mitigate stresses on...
Combustion of Natural Gas without the Presence of Nitrogen
Kamil Sikora
Acta Mechanica Slovaca 2024, 28(4):38-42 | DOI: 10.21496/ams.2024.021
The following article deals with the consequences of burning natural gas without the presence of atmospheric nitrogen. It is primarily a change in the volumetric flow of flue gas in the exhaust system of the furnace. With the help of modified stoichiometric tables and the flow equation in the chimney, the difference in draft ratios of the furnace draft, when switching from conventional burners to oxygen burners, is demonstrated here on a specific industrial unit.
Static and Fatigue Performance Prediction in the Riveted and Hybrid Double Shear Lap Joints
Boumedyen Abdesselam, Khamis Hadjazi, Med Larbi Bennegadi, Zouaoui Sereir
Acta Mechanica Slovaca 2024, 28(4):26-36 | DOI: 10.21496/ams.2024.020
By the present paper, a numerical model was proposed to estimate the fatigue life of hybrid (riveted and bonded) double lap joints. In order to enhance the performances of our double lap joints in particular the equivalent rigidity and the ultimate resistance, initially, a static study was made. From the contour plots of normal, shear and equivalent stresses, a sensitivity study was carried out on the effects of thickness of the substrates, rivet diameter and the overlap length. After that, a numerical model was developed to evaluate the fatigue life of the hybrid double shear lap joint. Comparison between riveted and hybrid joints in term of the distribution...
Numerical Study of Tensile-shear Fracture Behaviour of Resistance Spot Welded Sheet Steel with DP 450 and DP 980
Cherfi Mohamed, Ait kaci Djafar, Moulgada Abdelmajid, Sahli abderahmane, Ghermaoui Ilias Mohammed Amine
Acta Mechanica Slovaca 2024, 28(4):14-24 | DOI: 10.21496/ams.2024.018
The use of resistance electric welding to assemble metal plates is of crucial importance in various industrial sectors. Studying the fracture behavior of resistance-welded components, especially alloys DP450 and DP980, is crucial to ensure the reliability and durability of welded structures in demanding industrial applications. When components are subjected to mechanical loads, the resulting stresses can exceed tolerable limits, leading to the initiation of damage and, ultimately, fracture. A comprehensive investigation into the fracture behavior of resistance-welded components using DP 450 and DP 980 alloys will provide a better understanding of the...
Experimental and Numerical Investigation on Blade Sweep to Improve Performance of an OWC Turbine
S. M. K. Benslimane, K. Boualem, T. Yahiaoui, Antonio Mañino Ferrando, María Clavero Gilabert, Nemdili Ali
Acta Mechanica Slovaca 2024, 28(4):6-12 | DOI: 10.21496/ams.2024.026
The energy of sea waves is one of the renewable energies. The wells turbine uses the airflow produced by the pressure change inside the oscillating water column. A visible radial drift from the main flow occurs downstream of the rotor is noticed in the turbines wells with a constant chord length of the blade. Indeed, a blade chord linearly increasing with a radius is proposed in order to minimize this phenomenon and to increase the local coefficient of lift of the blade. In this context an investigated experimental and computational method are carried out to analyze the performances of two types of Wells turbines, one with a constant chord blade (rectangular-shaped...
Characterization of Nanostructured Magnetic alloy Based on Fe- Nd-Gd-B Produced by Mechanical Synthesis
Rachid Boughedaoui, Habib Achache, Abdennour El Mohri, Rachid Zahi, Mohamed Azzaz
Acta Mechanica Slovaca 2024, 28(3):74-83 | DOI: 10.21496/ams.2024.025
This paper examines the effect of Nd substitution by Gd on the exchange coupling in the Nd₂Fe₁₄B nanocomposite. The structural, microstructural, and magnetic properties of Fe76 Nd(16-X) GdXB8 alloy (X = 0, 2, 4, 8, and 16) were investigated. Nanocrystalline alloy samples Fe76 Nd(16-X) GdXB8 (in atomic percentages) were prepared from pure elemental powders by mechano-synthesis. The obtained materials were characterized by X-ray diffraction (XRD), which helped track the dissolution of neodymium and gadolinium in the iron matrix. The maximum crystallite size obtained was 6.5 nm with a microstrain of 1.49% for our powders. Magnetic...
Application of Data-mining Methods in the Assessment of Excessive Vibrations: Decision Trees, Basket-market Analysis
Miriama Pinosova, Miriam Andrejiova
Acta Mechanica Slovaca 2024, 28(3):60-73 | DOI: 10.21496/ams.2025.002
The article examines the issue of assessing the impact of above-limit vibrations on the health of employees in handling and dispatch warehouses (timber yards). The results are based on the arithmetic mean of multiple measurements of both hands of the chainsaw operator or the hands/whole body of the machinist, while taking care to maintain consistency. The measurement locations, measurement duration and selection of samples were chosen so that the result represented and described the employee's personal exposure. The main objective was to identify the relationship between the working activity of the studied forest administration employees, exposure...
Optimization Study about a Hybrid Energy System (solar PV and wind) to Supply a Habitat Located in an Isolated Area in Algeria
Maamar Mouheb, Ahmed Fellah, Mohamed Amine Khorchef, Bendaoued Bencherki
Acta Mechanica Slovaca 2024, 28(3):50-59 | DOI: 10.21496/ams.2024.011
Generation of energy from renewable resources is mainly implemented to supply to remote rural areas. In this context, we attempted to exploit the renewable energy (especially solar and wind power) that characterizes a remote and isolated site in Algeria, which also benefits from motivating tourist characteristics, our aim is to develop the site through supplying habitats with clean and free energy and reducing greenhouse gas emissions. For this purpose, we suggest the installation of a hybrid energy system (PV, wind and diesel), and we will do an optimization study about the feasibility and ability of the proposed system to meet the energy needs without...
Real-Time Location Systems Across the Industries - Literature Review and Case Studies
Laura Lachvajderová, Milan Fiľo
Acta Mechanica Slovaca 2024, 28(3):42-48 | DOI: 10.21496/ams.2024.017
Real-Time Location Systems (RTLS) are pivotal in enabling the instantaneous tracking and monitoring of objects, contextualized within their immediate environment and time frame. The current industry landscape boasts a plethora of technologies and services, showcasing RTLS's expansive potential in the manufacturing, healthcare, and logistics sectors. This article endeavours to elucidate a holistic understanding of RTLS's technical proficiencies while transcending the confines of a myopic view limited to isolated solutions. It posits that RTLS-based infrastructures can be methodically engineered utilizing this technology, fostering advancements in industrial...
Specific Aspects of Roughness Measurement
Katarína Paľová, Tatiana Kelemenová
Acta Mechanica Slovaca 2024, 28(3):36-40 | DOI: 10.21496/ams.2024.028
The article deals with problems in determining the surface roughness of parts. The arithmetic mean height of the roughness Ra is mainly monitored. This quantity is most often used when defining the required surface quality of components. Assessment of surface roughness is important in the production of parts, their assembly and their use. This article solves some problems in the process of determining this quantity.
Theoretical and Numerical Study on the Dynamic Behaviour of a Rotor with a Conical Steel Shaft
Rachid Zahi, Habib Achache
Acta Mechanica Slovaca 2024, 28(3):26-34 | DOI: 10.21496/ams.2024.012
This work proposes a theoretical and numerical study on the behaviour of the tapered rotor. The characteristics of the elements of the rotor are determined; it is to evaluate the expressions of the kinetic and potential energies as well as the virtual work corresponding to the basic elements disk, shaft, bearing for the two conical models by applying the method of the finite elements. Numerical simulation allows us to observe and determine modal analysis and natural values.