Acta Mechanica Slovaca, 2012 (vol. 16), issue 1
Teoretical Basis and Application Possibility of Radiosity Methods for Lighting Researches
Miroslav Badida, Ružena Králiková, Katarína Kevická
Acta Mechanica Slovaca 2012, 16(1):6-17 | DOI: 10.21496/ams.2012.001 
The article deals with designing internal artificial lighting as part of the work on the environment, which is subject to certain rules, derived from the nature of lighting. Good lighting exerts an impact on visual comfort - which contributes to overall psychological well-being, and indirectly also to the quality and productivity of performance, to reliability, and to visual performance - and which must be maintained, especially in long-term operations and in adverse conditions, to ensure quality of work and safety. One of the most frequently raised requirements for project design nowadays is speed; therefore a successful project cannot be done without...
Modelling of Nitrogen Oxides Production during Wood Combustion
Mária Čarnogurská, Miroslav Příhoda, Marcel Koško
Acta Mechanica Slovaca 2012, 16(1):18-25 | DOI: 10.21496/ams.2012.002
The process of elaboration and consequent verification of mathematical model of NOx production during wood combustion based on the dimensional analysis theory is presented in this paper. The model is based on selected physical quantities which can be measured continually during boiler operation. Primarily, the model was elaborated for boiler type VERNER V210 of 20 kW performances and its validity was also verified for the same construction type of boiler of lower performance (14 kW). Lump wood of lower calorific value approximately 15 MJ∙kg-1 was used as fuel in the boilers. The results showed that the dimensional analysis can be applied to...
Mathematical Model of Harmful Substance Amount in Soil
Dušan Knežo
Acta Mechanica Slovaca 2012, 16(1):26-29 | DOI: 10.21496/ams.2012.003
There are brought into soil various chemical substances as a result of human activity with a positive or negative impact on the soil characteristics. Concentration of the added substances is changing over time and it is important due to many reasons to know the relation between the substance concentration and the time. One of important factors with an impact on the substance concentration in the soil is the natural degradation of materials. That is why there is presented in this paper a mathematical model of substance degradation process during a simple and repeated application of the given substance.
Integrated Designing of Production Systems on the Physical and Virtual Modelling Base
Jozef Kováč, Vladimír Rudy, Albert Mareš, Juraj Kováč, Peter Malega
Acta Mechanica Slovaca 2012, 16(1):30-40 | DOI: 10.21496/ams.2012.004
Integrated designing of production systems on the physical and virtual modelling base is added in specific goal 3: Designing innovation and implementation of production system, high-tech products and development of knowledge intense service for elimination the innovation project risks within formation the research excellence centre in SjF TU of Košice. The solution has to contribute to extension the knowledge in the area of integrated designing of production systems through experimental laboratory activities supported with sophisticated high-tech technologies.
Positional Adjustment for Setting Highway Network of the D1 Motorway Section Mengusovce-Jánovce
Silvia Gašincová, Juraj Gašinec
Acta Mechanica Slovaca 2012, 16(1):42-51 | DOI: 10.21496/ams.2012.005
The D1 motorway is the most important and longest Slovak highway which after its completion will connect the border crossing Bratislava Záhor with the state border with Ukraine via Trnava, Trenčín, Žilina, Poprad, Prešov, Košice and Michalovce. It is part of route "A" 5 of the Pan-European corridor (Trieste) - Bratislava - Žilina - Košice - (Uzhhorod - Lvov) and European routes E50, E58, E75, E442 and E571. The D1 motorway has been under construction since 1972, and currently nearly 320 km long track is in operation, which is less than 62% of the total planned length of 515.621 kilometers. The present paper deals with the issue of building a surveying...
Experimental Investigation of Clinch Joining Process
Tadeusz Balawender
Acta Mechanica Slovaca 2012, 16(1):52-56 | DOI: 10.21496/ams.2012.006
This study presents an attempt to improve the resistance of clinch joint. The forming of clinch joining method was experimentally investigated for various combinations of clinching tools (punch and die) and process conditions. The experiments covered the effect of these changes on the joint undercut, neck thickness and bottom thickness. The relevant geometrical aspects of the punch/die set and process conditions were determined. The shear tests of a single lap clinched joints were performed to estimate the effect of the clinch process conditions.
Research of Environment-Friendly Techniques Influence on Accuracy of Gear Processing in Context of Sustainable Machining by Near Dry Machining
Domnita-Florina Fratila
Acta Mechanica Slovaca 2012, 16(1):58-65 | DOI: 10.21496/ams.2012.007
This paper highlights the importance of the sustainable machining technologies in achieving sustainable development objectives. The machining processes constitute a major manufacturing activity that contributes to the growth of the global economy. The research and the development in the machining processes have improved machining performances through advanced tool materials, higher productivity and quality, while the environmentally and the health-friendly technologies are becoming increasingly important for achieving cleaner, healthier, and safer machining. In the context of the sustainable machining, the case study presents the influence of the environment-friendly...
The analysis of the constitutive model effect on convergence of results with the experiment for FEM modeling of 3D issues with high elastic-plastic deformations
Stanisław Kut
Acta Mechanica Slovaca 2012, 16(1):66-72 | DOI: 10.21496/ams.2012.008
This paper presents the results of experimental researches and FEM modeling for tension process of an original plane specimen with notch. The specimen was made of the low carbon steel sheet with thickness of 4 mm. The modeling was performed with three different constitutive relationships, which are available in commercial software for modeling the non-linear issues with high strains. The three-dimensional numerical model was based on the experimental model. The results of individual models were compared with the experimental results. The special attention was paid to convergence of force characteristics and modeled specimen shapes in areas of the highest...
Risk Assessment Tools for Nonlinear Dynamic Systems
Milan Oravec, Barbora Kováčová
Acta Mechanica Slovaca 2012, 16(1):74-82 | DOI: 10.21496/ams.2012.009
Tools for quantitative risk assessment used in praxis are predominantly based on linear transformations. A parallel problem of current risk assessment methods is constant time and imperceptions of variability of threat over the course of time. Bertalanffy, Wiener, Haken, and Prigogine emphasized interdisciplinary approach and its potential utilization in risk assessment. Two specific cases of causal dependence are domino effect and synergic effect. Risk as an attribute of causal dependence is common for all present management systems. The paper deals with details of synergic effect mechanism, its identification and possible utilization in the field...
Theoretical Analysis of the Buckling Phenomenon in the Upsetting Process of Magnesium Alloy Mg4AlZn
Gontarz Andrzej, Tofil Arkadiusz
Acta Mechanica Slovaca 2012, 16(1):84-88 | DOI: 10.21496/ams.2012.010
The issues present during simulations of the upsetting process of magnesium alloy Mg4AlZn are presented in this paper. The bar buckling, which is the main phenomenon limiting this process, was analyzed. The aim of the analysis was determining such conditions of simulations which would allow to obtain shape and eccentricity similarity to the real product. Two ways of buckling imposing in a theoretical model underwent research: non-axial movement and inclination of the upsetting tool working surface. The conducted analysis allowed to estimate the effectiveness of both analyzed ways of obtaining similarity between the theoretical model and the real process.
Epistemic logic and the process of verification used in ambient intelligence home environment
Robert Bucko
Acta Mechanica Slovaca 2012, 16(1):90-94 | DOI: 10.21496/ams.2012.011
In this work I present the way of using an epistemic logic and the process of knowledge verification in order to control and monitor the object in the given environment. The achievement of correct recognition of situations depends on the system knowledge and how the system responds on the given issue. The aim is to describe and induce an example of using the logical or epistemic procedures.