Acta Mechanica Slovaca, 2020 (vol. 24), issue 4
Development of Mechanism for Finger Prosthesis
Dominika Belvončíková, Lucia Bednarčíková, Monika Michalíková, Branko Štefanovič, Marianna Trebuňová, Viktória Mezencevová, Jozef Živčák
Acta Mechanica Slovaca 2020, 24(4):6-11 | DOI: 10.21496/ams.2020.028 
Nowadays prosthetic fingers provide not only a cosmetic solution to the problem, but mainly they provide function. 3D printing is an ideal technology for the manufacturing of low-cost prostheses, especially the upper limb prosthetics. The advantages offered by this technology make it possible to increase the level of creativity, personalization and at the same time provide space for new variants of control mechanisms regarding movement efficiency. The aim of the paper is to present variant design of a finger prosthesis manufactured by 3D printing, which have been developed and tested at the Department of Biomedical Engineering and Measurement, Faculty...
Gas Flow at Very High Pressure and Speeds
Kamil Sikora
Acta Mechanica Slovaca 2020, 24(4):12-14 | DOI: 10.21496/ams.2021.003
This article was created on the basis of long-term practical experience with the flow of compressed gases in pipelines and fittings. In areas of low pressures, up to about 0.4 MPa, the physical phenomena regarding the outflow of gas from pressure systems are relatively consistent with theoretical calculations. The higher the pressure in the pressure reservoir system (most often a container or a bundle of pressure cylinders), the greater the difference between the theoretical calculation and the actual behavior of the discharged gas. The data for this article are based on the calculation of the flow of compressed natural gas during uncontrolled discharge...
Innovative Project Methods and Procedures for Implementation of Companies
Vladimír Rudy, Norbert Šmajda, Ján Rusnák
Acta Mechanica Slovaca 2020, 24(4):16-22 | DOI: 10.21496/ams.2020.030
Designing of today's complex and diverse production systems requires a comprehensive analysis of their operations in three spatial dimensions and over time. Only this approach is a guarantee of identification, optimization, respectively elimination of project disadvantages before their future physical implementation. The designer of tomorrow's production groups must be a professional and a specialist. He must have the creativity and professional theoretical and practical knowledge of the issues that are solved in the project. In technical project solutions, he must have a sense of precision and addressing details as a limiting requirement for the success...
Surface Preparation when Joining Dissimilar Steels by Adhesive Bonding
Anna Guzanová, Dagmar Draganovská, Miroslav Tomáš, Erik Janoško, Róbert Moro
Acta Mechanica Slovaca 2020, 24(4):24-34 | DOI: 10.21496/ams.2020.033
The paper deals with the application of different types of surface preparation before the formation of glued joints made of the same and different steels. Iron phosphate, chromate-free passivation and an experimental preparation based on organosilane were tested. Deep-drawn uncoated steel DC04 and HSLA galvanized steel HX340LAD+Z were joined by adhesive bonding. When applying all types of surface preparation, the joints´ strength was achieved at least at the level of the yield strength of weaker material (DC04). Surface preparation with organosilane leads to a bond strength that is close to the yield strength of a stronger material (HX340LAD+Z) and,...
Machine Tool Accuracy DMG MORI DMU 50 measuring by system Ballbar QC20-W
Radim Liška, Dagmar Šoková, Robert Čep, Lenka Čepová, Jiří Kratochvíl
Acta Mechanica Slovaca 2020, 24(4):36-42 | DOI: 10.21496/ams.2021.002
This article deals with the measurement and evaluation of the circularity of the machine DMG MORI - DMU 50 using the measuring system Ballbar QC20-W, which can measure the circularity of the machine using circular interpolation. Furthermore, the system can evaluate machine errors or measurement errors. This can prevent a number of problems, such as financial losses, compliance with the required accuracy and adherence to order deadlines. All three planes of the machine tool were measured - XY, YZ and ZX. In each plane, accuracy (roundness deviations) was measured at three values of feed rate 1000, 1500 and 2000 m.min-1. Each measurement was evaluated...
Acoustic properties of washing machines in terms of customer expectations
Anna Yehorova, Ervin Lumnitzer
Acta Mechanica Slovaca 2020, 24(4):44-50 | DOI: 10.21496/ams.2020.035
The presented paper focuses on the possibilities of evaluating the acoustic properties of partial noise sources of household washing machines. The introductory parts are focused on the analysis of the use of a new type of properties, so-called customer-oriented acoustic properties of the product. The next part focuses on the design of an evaluation methodology, which is used for laboratory measurements of psychoacoustic properties. This methodology, after laboratory testing, is used for measurements in real conditions of selling, directly in sales premises. A listening test is proposed, the results of which are used to determine the acoustic properties...
Selected Terrorist Attacks in Civil Aviaton in the Early Part of the 21st Century
Václav Adámek
Acta Mechanica Slovaca 2020, 24(4):52-59 | DOI: 10.21496/ams.2021.005
Developments in transport, the world's geopolitical order and technical innovations at the beginning of the millennium have also brought the real threat of terrorism back to civil aviation. The biggest catastrophe was the terrorist attacks of September 11, 2001 in the USA. Following this event, global terrorism became a much-discussed issue in today's world, while current threats have motivated significant improvements and tighter security in civil aviation in all developed countries around the world.
Industry 4.0 and Modification of Study Programs at the Faculty of Mechanical Engineering, UWB Pilsen
Josef Basl, Milan Edl
Acta Mechanica Slovaca 2020, 24(4):60-64 | DOI: 10.21496/ams.2021.004
The paper deals with the topic of industry 4.0 and its use in the preparation and teaching of students of the Faculty of Mechanical Engineering, UWB Pilsen. It presents the directions of further development, which is reflected in the modification of subjects and the formulation of a new study program "Intelligent Manufacturing Systems". This activity of the faculty uses the outputs of the project TL 01000081 financed by the Technology Agency of the Czech Republic entitled "Changing the role of the university and innovation of study programs within the phenomenon 4.0 in the fields of machinery, pedagogy and health care".