Acta Mechanica Slovaca, 2025 (vol. 29), issue 4
Mathematical Modeling to Compute Topological Indices of Some Polymers Using Graph Polynomials
Muhammad Irfan, Amina Rasool, Khalid Pervaiz, Hamood Ur Rehman
Acta Mechanica Slovaca 2025, 29(4):6-21 | DOI: 10.21496/ams.2026.003 
Graph theory offers powerful tools for modeling, designing, analyzing, and understanding the features of chemical structures and networks. In this framework, atoms are represented as vertices and chemical bonds as edges, forming a molecular graph. This paper focuses on the chemical graphs of Styrene Acrylonitrile (SAN) and Acrylonitrile Butadiene Styrene (ABS). Styrene Acrylonitrile (SAN) copolymers have been available since 1940. Their increased toughness compared to styrene made them suitable for various applications. However, SAN's limitations led to the addition of rubber (butadiene) as a third monomer, giving rise to Acrylonitrile Butadiene Styrene...
Virtual Prototyping of Electric Vehicle Powertrain Using Multibody Dynamics and Spline-Based Motor Models
Jozef Bucha, Zarko Miskovic, Tomáą Milesich
Acta Mechanica Slovaca 2025, 29(4):22-27 | DOI: 10.21496/ams.2025.030
This paper presents the development and validation of a multibody dynamics (MBD) model for the VW e-Up Boost electric vehicle using Adams/Car software. The study focuses on modeling the vehicle's powertrain system, which includes a front-mounted electric motor and two rear Emrax 288 electric motors. The powertrain model utilizes spline-based torque characteristics to accurately represent electric motor behaviour. A three-level modeling approach (template, subsystem, and assembly) is implemented to create a comprehensive vehicle simulation environment. The vehicle model incorporates a modified suspension system with MacPherson struts at both front and...
Calibration of Pressure Gauges
Dmytro Malakhov, Tatiana Kelemenová
Acta Mechanica Slovaca 2025, 29(4):28-34 | DOI: 10.21496/ams.2026.001
The aim of this work is to verify and calibrate a mechanical Bourdon-tube pressure gauge for which the manufacturer provides only basic specifications. Before such instruments are integrated into industrial or laboratory systems, additional information about their behaviour-such as linearity, systematic error, hysteresis, and measurement uncertainty-is required to ensure reliable operation and compliance with metrological standards. This paper presents a practical methodology for the rapid identification of the key metrological parameters of a pressure gauge. The procedure uses a pneumatic pressure source and a high-accuracy reference gauge to compare...
Vibration-Controlled Jet Breakup for Monodisperse Droplet Formation in a Rotating Granulation System
Dmitry Zabitsky, Ruslan Ostroha
Acta Mechanica Slovaca 2025, 29(4):36-43 | DOI: 10.21496/ams.2026.005
This study examines vibration-controlled jet breakup and its role in droplet formation in a rotating granulation system. A 22 full factorial experimental design was used to evaluate the combined influence of actuator position (5/30 mm) and liquid column height (120/450 mm) on the forced vibration regime. A regression model confirmed the presence of structural-dynamic interaction between these parameters. Experimental observations showed that stable monodisperse droplets were obtained at a liquid column height of 380 mm, vibration frequency of 380 Hz, and amplitude of 100 µm, where periodic pinch-off occurred without satellite droplets....
Inter-device Consistency in 3D Burn Surface Estimation
Katarína Dudová, Bibiána Ondrejová, Branko ©tefanovič, Lucia Bednarčíková, Jozef ®ivčák
Acta Mechanica Slovaca 2025, 29(4):44-49 | DOI: 10.21496/ams.2025.031
The objective of this study was to estimate whether the Revopoint Miraco portable 3D scanner provides sufficient accuracy in comparison to the Artec Eva for measuring burn wound surfaces. A total of 26 anatomical regions were scanned in 11 patients. The results demonstrated good agreement between the two devices, with a mean relative difference of 4.1%. Additionally, the study assessed the advantages and limitations of each scanner in terms of operational workflow, user-friendliness, and portability.
Implementation of Audio Guidance in Unity VR Simulations
Erik Varjú, Juraj Kováč
Acta Mechanica Slovaca 2025, 29(4):50-53 | DOI: 10.21496/ams.2025.029
This article presents a guided virtual reality (VR) simulation for the assembly of a robotic arm, developed in Unity 3D using the VR Builder framework. The simulation is designed for educational and training purposes, targeting engineers and technical professionals seeking an interactive understanding of mechanical assembly processes. It runs on the Meta Quest 3 headset in full VR mode, using controllers for object interaction. The primary aim is to demonstrate how immersive environments can enhance comprehension of part functionality and assembly order through intuitive interaction and audio guidance. The simulation consists of a short assembly sequence...
Automatic Corrector of Forming Operations during Forging on High Speed Forging Machines
Kamil Sikora
Acta Mechanica Slovaca 2025, 29(4):54-57 | DOI: 10.21496/ams.2026.007
Currently, the wear of anvils on speed forging machines is mostly checked manually, using calibration gauges. In practice, an authorized worker, on the instructions of the machinist, measures the finished forging with a calibrated gauge and this dimension is compared with the final setting of the forging program. The problem is that the program information on the clamping of the anvils does not take their wear into account. During the forging of bars with diameters greater than 200 mm, excessive die wear frequently occurs. Worn dies subsequently measure the in process dimensions of the forged bars inaccurately. In response, a new measurement method...
Energy-Efficient Optimization of Refrigeration Systems for Large-Volume Cooling Applications
Waldemar WoĽniak, Michał S±siadek
Acta Mechanica Slovaca 2025, 29(4):58-63 | DOI: 10.21496/ams.2026.006
This work aims to analyse and optimise key parameters of refrigeration technology intended for large-capacity spaces, with an emphasis on energy efficiency, temperature stability, and operational reliability. The research focuses on identifying the factors that influence the efficiency of cooling systems, including temperature and pressure conditions, flow parameters, cooling distribution, and equipment structural layout. Through simulation models and experimental measurements, optimisation procedures are proposed to reduce energy consumption, minimise thermal losses, and increase overall system performance. The results provide recommendations for...