Acta Mechanica Slovaca, 2011 (vol. 15), issue 4
An Application of High-speed Digital Image Correlation in Determination of Modal Parameters
František Trebuňa, Róbert Huňady, Zdenko Bobovský, Martin Hagara
Acta Mechanica Slovaca 2011, 15(4):6-12 | DOI: 10.21496/ams.2011.034 
The paper deals with digital image correlation method that belongs to the most modern optical method used in experimental mechanics. The main attention is devoted to an application of this method in determination of modal parameters. There is described a methodology of measurement of eigenshapes and eigenfrequencies by high-speed correlation system Q-450 Dantec Dynamics. A part of this procedure is software called Modan that was designed and created as effective tools for evaluation of such type of experimental measurements.
Design of Humanoid's Lower Limbs Model and Phases of Walking
Marek Sukop, Mikuláš Hajduk, Ľuboš Marko, Jozef Varga
Acta Mechanica Slovaca 2011, 15(4):14-19 | DOI: 10.21496/ams.2011.035
This paper describes basic principles of the kinematic structure design for two - leg walking robots. The article deals with the design of walking phases detailed, which is described in sagital and frontal plane so that movement of the centre of gravity was outside the support polygon and also offers the model of walk for the concrete construction of the two - leg walking robot. This article is the result of research activities of our department in humanoid robotics.
Influence of Corrosive Environment on the Surface Quality of Spot Welds
Emil Spišák, Ľuboš Kaščák, Janette Brezinová, Ján Viňáš, Dagmar Draganovská, Daniel Jankura
Acta Mechanica Slovaca 2011, 15(4):20-25 | DOI: 10.21496/ams.2011.036
The paper deals with the evaluation of quality of resistance spot welds. Hot-dip galvanized steel sheets of DX54D+Z quality were used for experiments. Electrochemical properties of used materials were observed. Carrying capacities of spot resistance welds were measured before as well as after exposure in corrosive environment. The tensile test was used for evaluation of carrying capacities. The quality of spot welds was evaluated on the base of microhardness measurements results realized on the scratch patterns too.
Product Innovations and Agile Manufacturing
Milan Kováč, Štefan Babjak, Michal Dúbravčík, Andrea Lešková
Acta Mechanica Slovaca 2011, 15(4):26-34 | DOI: 10.21496/ams.2011.037
The automotive sector is facing advanced challenges arising from global changes in the technical, economic and social environment. Trend, referred to as the "agile manufacturing" represents the ability to survive and prosper in a competitive environment of continuous and unpredictable changes. It means to respond quickly and effectively to changing markets, produce goods and services according to customer needs via maintain the continuous product innovation, manageable number of product variants, fulfilling the unpredictable requirements of customers, shortening product life cycle and respond to significant fluctuations in sales. Submitted article...
Logistics Application on the Selected Part of Urban Mass Transportation Network in the City of Košice
Peter Bigoš, Daniel Kachman
Acta Mechanica Slovaca 2011, 15(4):36-42 | DOI: 10.21496/ams.2011.038
The submission of an article deals with urban mass transportation logistics and its application in the city of Košice. Describes the present state of knotting traffic lines on the selected part of urban mass transportation network in the city of Košice and the way how it can be determined the shortest way by the Dijkstra's algorithm. Next there was selected suitable traffic node to transmission of passengers between the particular lines. In that node there was made a harmonization of traffic lines.
New Possibilities of using PhotoStress® Method
František Trebuňa, Peter Frankovský, Jozef Bocko, Miroslav Pástor
Acta Mechanica Slovaca 2011, 15(4):44-50 | DOI: 10.21496/ams.2011.039
The PhotoStress® method allows the determination of strains and stresses in the loaded and photoelastically coated structural members. The quantitative values of differences of the principal strains (stresses) and their directions can be used to obtain the field of strain or stress components on the whole coated surface using further experimental data. In order to accelerate the process of measurement in the point, along the line or on the surface a new software application PhotoStress was designed and developed by the authors in collaboration with "Kybernetika, s.r.o." company that allows to determine directions and magnitudes of differences of...
Application of Computational Methods and Methods of Experimental Stress Analysis for Determination of Lifespan of Pipe Yards
František Trebuňa, Jozef Bocko, Ingrid Delyová, Peter Sivák
Acta Mechanica Slovaca 2011, 15(4):52-57 | DOI: 10.21496/ams.2011.040
Compressor stations and their pipe yards are technological complexes that are loaded by dynamic loading during their operation. The result of such loading can be fatigue failure of structural member or whole system with serious consequences. One possibility of decreasing disadvantageous dynamic loading and increasing of lifespan is using vibroinsulation elements. The lifespan of structure is intimately connected to critical locations as pipe joints realized by welds. Residual lifespan is expressed on the basis of data gained by experiments according to appropriate standards.
Increasing Degree of Automation of Production Systems Based on Intelligent Manipulation
Marek Sukop, Mikuláš Hajduk, Vladimír Baláž, Ján Semjon, Marek Vagaš
Acta Mechanica Slovaca 2011, 15(4):58-63 | DOI: 10.21496/ams.2011.041
In project implementation by the Centre for management of technical, environmental and humane risks research for permanent development of production and products in machinery industry, specifically for the activity 3.2. Which deals with automation and robotization of production systems, the main target is increasing degree of automation with focus on intelligent manipulation on 3D basis. This target is being applied by large scale use of robots for various manipulation and technological application. The solution is based on two camera sensors which enable intelligent manipulation on 3D basis. For this purpose a sensor and software for object recognition...
Informatics Support of the CENTRE OF EXCELLENCE
Kamil Madáč, Ján Kráľ ml.
Acta Mechanica Slovaca 2011, 15(4):64-67 | DOI: 10.21496/ams.2011.042
Modern engineering technology in the Centre of Excellence need the best support communication and computing infrastructure. It is not just about hardware devices but also software and training staff. The big advantage is maximum use of the so-called "open source" system, where operating costs are minimal and often have much more support than closed commercial systems.
Raman Spectroscopy in Polymer Processing Technologies
Ivan Gajdoš, František Greškovič, Ján Slota, Ľudmila Dulebová
Acta Mechanica Slovaca 2011, 15(4):68-73 | DOI: 10.21496/ams.2011.043
Presented paper describes the application of Raman spectrometry in polymer processing technologies. Quick and reliable material identification is becoming and serrious issue in polymer processign technologies . Vibrational spectroscopy was long time used in polymer analysis. Preferred technique was the infrared spectroscopy (IR), but actual progress allows easy application of Raman spectroscopy and its main advantages. Raman spectroscopy detects vibrations that generate a change in the molecule's polarizability. The Raman effect arises when a photon is incident on a molecule and interacts with the electric dipole of the molecule. It is a form of electronic...
Optical Measuring of 3D Deformation in Sheet Metal Forming
Emil Spišák, Ján Slota, Miroslav Tomáš, Emil Evin, Jana Majerníková
Acta Mechanica Slovaca 2011, 15(4):74-80 | DOI: 10.21496/ams.2011.044
During recent years, optical measuring technologies in sheet metal forming and tooling have been used more and more in the industry. Main applications are the digitizing of metal sheet parts and tools, forming analysis of metal sheets as well as the determination of material properties. Good interfaces to conventional CAD/CAM and numerical simulation systems made such optical measuring systems a part of complex process chains. These process chains mainly focus on optimizing the development of products and production processes and on improving the product quality. Using optical systems considerably decreases the development time for products and production...
The Proposal for a Knowledge Center for Support of a Knowledge Base for the objectification of Environmental Factor
Ervin Lumnitzer, Monika Biľová, Lenka Rusinová
Acta Mechanica Slovaca 2011, 15(4):82-87 | DOI: 10.21496/ams.2011.045
The paper deals with the research of the project "Centre for Management Research of Technical, Environmental and Human Risks for Continuous Development Production and Products in Mechanical Engineering", namely the phase 1.2 " The Proposal for a Knowledge Center for Support of a Knowledge Base for the Objectification of Environmental Factors". It presents the latest results, equipment and software tools of the center and its application.