Actual number: 4/2020

ISSN 1339-5017 (Online)

Archive:


No. 4

IDENTIFICATION OF DECREASE OF CORROSION PROTECTION OF SILUMIN CASTINGS

Author: Ján BEZECNÝ, Róbert VAVRÍK, Andrej DUBEC

Abstract: Identification of decreased corrosion resistance of metal components working in real conditions is often very difficult. The reason is hidden in the large number of factors that can cause corrosion. The most important factors are: type of material, its processing technology, the resulting structure as well as the environment where the given part is used. The content of this paper is closely connected with the identification and description relating to corrosion of the part which operated without any problems under the real conditions in the past. The given investigated part was silumin castings. The designations as well as operating environment were not changed from the aspect of the used material.

Keywords: silumin casting, microstructure, EDX-analyse, corrosion, copper, porosity

Vol. 7, 2013, No. 4, p. 2-6

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SOURCES OF ELECTRIC ENERGY FOR LOGISTIC MEANS IN ISO 1C CONTAINERS

Author: Ivan KOPECKÝ, Ľudmila ŠIMOŇAKOVÁ, Danka RAKÚSOVÁ

Abstract: Nowadays a use of renewable sources of electric energy is still a live topic. Utilization of renewable sources of electric energy gets into mobile equipment and surely it would be beneficial in ISO 1C containers being used as mobile logistic means. Using non-conventional sources the mobile repair means would not be dependent only on an external electricity supply system, or on an electric supply plant, but it would have own alternate solution for production of electric energy.

Keywords: Electric power station, renewable source, photovoltaic collector, logistic container

Vol. 7, 2013, No. 4, p. 7-11

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SMALL GRID-ON AND GRID-OFF POWER STATIONS UTILIZING THE RENEWABLE SOURCES OF ENERGY

Author: Ján MIKLO

Abstract: Research and development in the area of utilizing the renewable sources of energy for production of electric energy is routed to the really applied systems, independent from the distributing system, or without necessity to build up it, respectively. Such systems are capable to substantially increase quality of human lives at areas without access to the conventional sources of energy, and involve them into full-value active social being, as well as contribute to the development of effective health service in such way, which so far couldn’t be utilized. This paper deals with developing and application possibilities of this revolutionary challenge and analyzes the real opportunities in solving the mentioned problems.

Keywords: renewable energy, solar, wind, grid-on system, grid-off system

Vol. 7, 2013, No. 4, p. 12-21

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SOLUTIONS FOR SELECTION OF FEASIBLE FUNCTIONAL MODELS OF POWER STATIONS BASED ON THE RENEWBLE SOURCES

Author: Michal RAFAJ

Abstract: Utilization of the renewable energy sources in island power station. The aim is to improve quality and safety of human life. Searching for suitable applications of implementing the functional models for long-term tests and validation of results.

Keywords: photovoltaics, power station, quality of life, ecology, extreme emergency

Vol. 7, 2013, No. 4, p. 22-28

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DEPENDABILITY OF SPECIAL EQUIPMENT

Author: Petr STODOLA, Jiří STODOLA, Mariana PLENCNEROVÁ

Abstract: The typical features of advanced economics of industrial countries include robust scientific and technological development characterized by effort to achieve the most effective production and utilization. Effectiveness and public productiveness can be achieved through quality projects, designs, manufacturing machines and equipment and of course through high-class designers, constructors, technicians and workers.

Keywords: Reliability, failure, safety factor, lifecycle.

Vol. 7, 2013, No. 4, p. 29-37

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PRELIMINARY THEOTRETICAL AND EXPERIMENTAL STUDIES AT THE RECOIL AND WEAPON’S JUMP OF THE AUTOMATIC FIREARMS

Author: Łukasz SZMIT, Zbigniew LECIEJEWSKI, Jacek KIJEWSKI

Abstract: Paper presents results of the preliminary studies at the recoil and weapon’s jump of the automatic firearms. Studies include theoretical and experimental examination of that phenomenon. Theoretical part of the studies is based on the recoil and weapon’s jump simulations of the chosen models of automatic firearms (MSBS-5,56). Experimental part of the studies includes shooting tests on the test stand – designed and constructed specially for this purpose. This allowed verification of the simulation results. Gained data proved also that both the recoil and weapon jump are strongly affected by the moving parts of the automatic weapon. Further works will focus on comparing different design schemes in order to find an optimal design with the lowest recoil and weapon jump.

Keywords: ballistics, weapon design, firearms tests, mechanics, firearm, rifle.

Vol. 7, 2013, No. 4, p. 38-46

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MODAL AND FREQUENCY ANALYSIS FOR ROTOR BLADES OF TURBOJET ENGINE TJ 100

Author: Ján VAVRO, Marta KIANICOVÁ, Ján VAVRO jr., Alena VAVROVÁ

Abstract: The paper presents modal and frequency analysis for the blades of the turbojet engine TJ 100 with the help of the mathematic

modelling of finite element method with utilization of Pro-Engineer and ANSYS. The paper also presents results of the stress

analysis of the turbine blades.

Keywords: Modal analysis, frequency analysis, finite elements method, ANSYS

Vol. 7, 2013, No. 4, p. 47-50

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