Acta Mechanica Slovaca, 2021 (vol. 25), issue 2
Metallurgical and Geometric Properties Controlling of Additively Manufactured Products using Artificial Intelligence
Snehashis Pal, Igor Drstvenšek
Acta Mechanica Slovaca 2021, 25(2):6-13 | DOI: 10.21496/ams.2021.015 
This article has presented a technical concept for producing precisely desired Additive Manufactured (AM) metallic products using Artificial Intelligence (AI). Due to the stochastic nature of the metallic AM process, which causes a greater variance in product properties compared to traditional manufacturing processes, significant inaccuracies in metallurgical properties, as well as geometry, occur. The physics behind these phenomena are related to the melting process, bonding, cooling rate, shrinkage, support condition, part orientation. However, by controlling these phenomena, a wide range of product features can be achieved using the fabricating...
Displacement Measurement in the Vertical Axis of the Measuring Microscope using Laser Triangulation Sensor
Eduard Jakubkovič, Tatiana Kelemenová, Ivana Koláriková
Acta Mechanica Slovaca 2021, 25(2):14-18 | DOI: 10.21496/ams.2021.019
The article deals with assessment of the suitability of using a laser triangulation sensor to measure the displacement in vertical axis of a measuring microscope. Data obtained from sensor calibration are used for determination of measuring range in which the smallest measurement error occurs. Linear approximation of the inverse calibration function is applied to correct systematic errors in reduced measuring range of the sensor. Residual measurement errors of corrected sensor output can be applied in uncertainty calculation for sensor future measurements.
Optimizing Performance of Porcelain Insulators: How does Particle Size Influence Dielectric and Mechanical Strengths?
Temitope Ologunwa, Tolulope Akinbogun, Robert Frischer, Isah Kashim, Kamil Kuca, Ondrej Krejcar, Oluwaseun Fadeyi
Acta Mechanica Slovaca 2021, 25(2):20-28 | DOI: 10.21496/ams.2021.017
Porcelain insulators are mostly created from the combination of the particles of Clay, Silica, Kaolin, and Feldspar. This implies that different particle sizes contribute to the insulating properties of the materials. In this paper, we attempt to create a set of model porcelain materials by critically analysing the particle sizes that are most likely to yield the best insulator results. Materials sourced from Edo State, Nigeria were processed to produce Porcelain insulator samples. For each of the component minerals, a 65g mass was compacted and pressed at 500 Psi (3.4 KN) into a steel cylindrical mould via hydraulic press, this was closely followed...
Stability Tests in the Process of Organization of Interlaboratory Comparison
Miloš Ujlaky, Teodor Tóth, Ing. Anton Frič, Daniel Kysler, Miroslav Dovica
Acta Mechanica Slovaca 2021, 25(2):30-35 | DOI: 10.21496/ams.2021.025
Success in programs of interlaboratory comparisons is based on two basic pillars. In addition to the inseparable share of the laboratory and the quality of the activities performed, the quality of the organized program of interlaboratory comparison also affects the final success. Organizing tests is a time consuming process. It includes several important stages that precede the laboratory's participation in the program itself. One of the most important stages is the selection of an object suitable for the purpose of comparative measurements. One of the criteria for selecting an interlaboratory comparison item is its stability. The article focuses on...
A Comprehensive Approach to the Evaluation of Material Properties of S235JR Steel
Adam Kaľavský, Peter Palička, Róbert Huňady, Michal Kicko
Acta Mechanica Slovaca 2021, 25(2):36-45 | DOI: 10.21496/ams.2021.023
The paper deals with the determination of mechanical and fatigue properties of S235JR steel, which is widely used in the engineering industry and also in other industries. The paper provides a brief overview of measurement procedures and basic mathematical formulations based on the standards ČSN EN ISO 6892-1 and ČSN 42 0368. The aim of the article is to provide a comprehensive view of the evaluation of material properties using not only conventional but also modern optical methods of mechanics, such as 3D digital image correlation or laser Doppler vibrometry. The output of the performed tests are material constants, mechanical properties in tension/pressure...
Application of Adaptive Neuro-Fuzzy Inference System for Prediction of Mean Thickness in Backward Metal Flow Forming Process
Prabas Banerjee, Arnab Karmakar, Nirmal Hui
Acta Mechanica Slovaca 2021, 25(2):46-55 | DOI: 10.21496/ams.2021.018
In the backward metal flow forming process, the mean thickness of flow formed tubes is crucial in determining the quality. Consequently, predicting the mean thickness in incremental forming and correlating these values with the forming parameters can be useful to control this vital target. Accordingly, four different techniques of adaptive neuro-fuzzy inference system (ANFIS) is used to predict the mean thickness of parts produced by the backward metal flow forming process. The objective is to determine the best membership function of the different approaches used in ANFIS. Also, the efficiency of the developed predictive models is compared statistically...
Evaluation Concept of Measurement Results in Utility Meters Testing
Peter Trebuňa, Jaromír Markovič, Štefan Král, Tomáš Švantner, Ladislav Rosocha
Acta Mechanica Slovaca 2021, 25(2):56-60 | DOI: 10.21496/ams.2021.008
The conformity assessment of utility meters is the process by which compliance of measuring instruments with essential requirements is determined. The uncertainties associated with accuracy measurements during testing shall be evaluated and accounted for when making decisions about conformity with the specifications. This paper describes evaluation methods of measurement results in utility meters testing applicable for conformity assessment and for testing laboratories.
New Hybrid System of Swarm Intelligence using for Minimal Path Travel on Contours
Matej Babič
Acta Mechanica Slovaca 2021, 25(2):62-67 | DOI: 10.21496/ams.2021.024
Anyone who observes ant colonies and swarms of bees gets the impression that they are following a certain plan. They are small states in which everyone seems to know their job and the sequence of which has always fascinated people: How would it be if this principle could be transferred to companies? In this article is presented new hybrid system of swarm intelligence using for minimal path travel on contours in mechanical engineering, especially in laser technology of hardening.