Acta Mechanica Slovaca, 2025 (vol. 29), issue 2
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,...
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...
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...
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...
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%...
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...
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...
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...