Manufacturing Technology Journal, 2015 (vol. 15), issue 5
Construction Product Quality Improvement with Applying Production Problems Analysis
Renata Stasiak-Betlejewska
Manufacturing Technology 2015, 15(5):756-761 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/756 
The study and analysis of the production process of the aluminum joinery allow identyfing factors significantly affecting the product quality. The main factor is undoubtedly the experience of employees, skills and the knowledge acquired during training and the aluminium ironworks. To improve construction aluminium product quality, production areas with identified nonconformities are the object of the analysis. Detection of nonconformities is an important element in this type of post-operative control process. It is recommended mainly to control the cutting sections, folding and crimping. The reliability increase performed on these operation positions...
Material Analysis of Projectile Hard Core
Ján Bezecný, Ján Štrba, Andrej Dubec
Manufacturing Technology 2015, 15(5):762-765 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/762
Ammunition projectiles disposal armored facilities used hard core as the main effect. The hard core has a smaller diameter than the calibre of gun. The core of the projectile is made of tungsten carbide, titanium, molybdenum or depleted uranium with a hardness of 80 to 120 measures by the Rockwell hardness test. The core must be not only hard but also tough and have a high bending strength. Knowledge of the hard core chemical composition, which the attacker uses, is important in relation to provide ballistic protection, minimization of radioactive risk and optimization of conditions for disposing of old ammunition. The basic tool for detection of the...
Checks Crane Hooks
Miroslav Blatnický
Manufacturing Technology 2015, 15(5):766-771 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/766
Paper deals with comparasion of methods for resolving stress state on the example of forged crane hook of selected load. For suitability of the comparasion is necessary to achieve comparable stress values by different methods. Problem of solving of different assignments by different methods is very extensive, and because of it, there is not clear answer, which of methods is universal and so always optimal. Any factors, that enter to the calculation and influence it, is the best way to choose an optimal method for solving of strength problems in mechanics.
Measurement of Temperature Fields in Methal Hydride Storage Container
Tomáš Brestovič, Natália Jasminská, Marián Lázár, Ľubica Kapustová
Manufacturing Technology 2015, 15(5):772-777 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/772
The article analyses the measurement with increased absorption kinetics of hydrogen into the La0.85Ce0.15Ni5 alloy. Within a time interval of 180 s an amount of 0.142 kg (1.58 m3) of hydrogen was absorbed into 56 kg of alloy. The process of absorption was accompanied by an increased temperature of the bed. Therefore it was simultaneously cooled by a cooler using Peltier elements. The numerical calculation of non-stationary heat transfer within the bed was performed with a known amount of heat generated in the bed, known temperatures and flow rates. Simulation results allow us to determine temperature time paths at key points of the bed and give insight...
Theoretical and Experimental Determination of a Velocity Profile under Turbulent Air Flow in Pipework
Mária Čarnogurská, Miroslav Příhoda, Marián Lázár
Manufacturing Technology 2015, 15(5):777-781 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/777
The paper experimentally and theoretically analyses the velocity profile of air in laboratory stand pipework. Flow velocities measured using a hot-wire anemometer and a vane anemometer were compared with the results of numerical simulation. The k-ε turbulence model was used in the numerical solution of flow rates and for determining the velocity profile using the ANSYS_CFX program. Using power law, this profile was described via an analytical function. Velocities determined by measuring with both instruments in the investigated place in the pipework showed lower values in comparison with the numerical solution. The cause of the difference in...
Multibody System of a Rail Vehicle Bogie with a Flexible Body
Ján Dižo, Jozef Harušinec, Miroslav Blatnický
Manufacturing Technology 2015, 15(5):781-788 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/781
In the field of designing of new or renovating the existing rail vehicles the iussue of individual structural units lifetime is currently appears increasingly coming to the fore for the vehicles long-term operation. On one hand, modern tools of virtual reality allow performing stress analysis of structures, most frequently using FEM, on the other hand, there is software designed for multibody system assembly intended for the evaluation of rail vehicles dynamic properties. Flexible bodies' implementation into a rail vehicle multibody system considerably extends the possibilities of computer simulations of rail vehicles running. In this paper we present...
The Numerical Solution of the Aerodynamic Task Using by CFD Modelling
Josef Dobeš, Milada Kozubková
Manufacturing Technology 2015, 15(5):788-795 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/788
The solution of the aerodynamic task is a very complex issue. An accurate description of the aerodynamic field is used for the specification and the solution of an aero-acoustic task. With the numerical modelling onset the possibilities of investigation of the flow around body are still expanding. The aim is to establish basic parameters by which the flow field around the body is described. This paper deals with the numerical modelling of the flow around a cylinder and a sphere and with the evaluation of the parameters (coefficients) for these bodies. The modelling is performed using the software tools Ansys Fluent and OpenFOAM. The basic setting of...
Investigation of Cutting Temperature during AlCu3MgMnPb Aluminium Alloy Turning
Rozmarina Dubovska, Jozef Majerik, Ivan Baska, Jaroslav Jambor
Manufacturing Technology 2015, 15(5):796-801 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/796
The main aim of this experimental paper is investigation, analyzing and realizing the experimental measurement of cutting temperature when external turning of rotational parts made from AlCu3MgMnPb aluminum alloy. In this experimental study a number of turning tests have been carried out by using a test lathe and a cutting temperature measuring device. This measurement have been successively investigated and experimentally verified with the special samples (in experimental measuring of the temperature during the turning process of samples and measured results designated with special thermal camcorder type FLIR used for special measurement of cutting...
Proposal of Biomass Heat Source for Microcogeneration Unit
Peter Ďurčanský, Jozef Jandačka
Manufacturing Technology 2015, 15(5):801-804 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/801
The use of renewable energy sources in Slovakia is currently very debated issue. The main cause of this discussion is the increase of energy prices, which increasingly burden the population and companies. The use of renewable sources, including biomass, represents an important contribution to solve this problem. When new heat source is designed, several technical regulations and recommendations must be followed. The proposed device is intended to serve for combustion of biomass, in the form of wood, of pellets. The aim of this work is to describe the design process of the combustion device as the main source of thermal energy in our proposed micro-cogeneration...
Model of Heat Load on the Atmosphere by Flue Fases
Ladislav Dzurenda
Manufacturing Technology 2015, 15(5):804-808 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/804
This paper presents the analysis of heat load on the atmosphere by flue gases emitted from boilers combusting fuel wood with moisture content W = 10 - 60 %. From the analysis results, that the heat load on the atmosphere is affected by the moisture content of combusted wood, as well as the construction of the heat generator's boiler part - the extent of cooling of exhaust gases. The value of heat load factor on the atmosphere by flue gases from combustion of dry fuel wood with moisture content W = 10% at flue gases temperature ts = 120 0C is FQ = 96,22 MJ.GJ-1. The factor's value at moisture content of the fuel wood W = 60% and flue gases temperature...
3D Printing as an Alternative to Casting, Forging and Machining Technologies?
Michaela Fousová, Dalibor Vojtěch, Jiří Kubásek, Drahomír Dvorský, Markéta Machová
Manufacturing Technology 2015, 15(5):809-814 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/809
3D printing technology has recently extended to metallic materials and allows now to produce 3D models directly from metallic powders. There are several methods of 3D metal printing, such as Selective Laser Sintering (SLS), Direct Metal Laser Sintering (DMLS), Electron beam melting (EBM) or Selective laser melting (SLM). Compared to conventional technologies of casting, forging and machining, these methods offer many advantages. The most important is shape variety allowing preparation of very complicated shapes and designs, which would be impossible to reach by classical techniques. Moreover, there is practically no material loss, since the remaining...
Geometrical Optimization of the Induction Heating Process in Order to Achieve Uniform Gloss on Plastics Components
Andrej Gašparec, Milan Sága
Manufacturing Technology 2015, 15(5):814-820 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/814
The article deals with numerical simulation of induction heating process as a coupling of electromagnetism and heat transfer with the scope to surface temperature optimization. The article presents how the position of the inductors used in the induction heating process influence the resulting temperature of heated surface. The scope of the article is to show methodology to optimize surface temperature by numerical approach.
Analysis of Force Conditions of the Hot Forming Machine in Rolling-Out of Bearing Rings
Marián Handrik, Milan Sága, Peter Pecháč, Peter Kopas
Manufacturing Technology 2015, 15(5):821-825 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/821
The main parameters of the hot forming machines are production capacity and the fatigue life of the used tools. The life of a tool depends on its shape and load. The load depends on the structural design and speed of forming. The goal of our paper is to present the structural optimization and technological parameters design with respect to tool life. This process is applied in the case of the hot forming machine analysis.
Performance and Emission Parameters Change of Small Heat Source Depending on the Moisture
Michal Holubčík, Jozef Jandačka, Štefan Papučík, Peter Pilát
Manufacturing Technology 2015, 15(5):826-829 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/826
It is relatively complicated to effectively burn biomass. Combustion of biomass fuel itself as a renewable energy source does not automatically ensure the best use of its energy content with low emission production. Biomass combustion with bad settings of combustion conditions can be ineffective and with a high production of emissions. The article discusses the impact of humidity on the thermal technical parameters of the heat source. The influence of the relative humidity of combustion air and the fuel moisture on thermal power and emission production in automatic boiler for combustion of wood pellets were specifically determined. The results show...
Examination of the Machinability of Eutectic Aluminium Alloys
Richard Horvath, Gyula Matyasi, Agota Dregelyi-Kiss
Manufacturing Technology 2015, 15(5):830-836 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/830
The industrial use of aluminium alloys has significantly increased in the last decades. Most machined parts are produced by cutting. Therefore, research in this field is quite important nowadays. Surface roughness is an extremely important quality parameter of a product, such as geometrical sizes and their tolerance. The authors in this article analysed the machinability of die-cast aluminium alloys with silicon often used in the industry. The turning experiments were made with different diamond tools edge geometry. The surface roughness obtained during turning was analysed in detail. Phenomenological models were created with which the surface roughness...
Degradation Processes in the Contact Layers of Forming Tools
Jiří Hrubý, Vladimíra Schindlerová, Josef Rentka
Manufacturing Technology 2015, 15(5):836-842 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/836
The article deals with cyclical abrasive wear of the surface of forming tools. At this stage the research focused on the genesis of stress in the contact between a deformed material and a tool in the cold bulk forming process. The experiments were conducted in the simple configuration of the upsetting test. The article presents the results of abrasive wear by a combination of materials of examined samples and upsetting plates. The abrasive wear in the used material specimens was analysed comparatively in the form of the wear factor by the finite element method. Two intersecting phenomenological fields represent the output for the examined material...
Method of Vortex Structure Identification in Axisymmetric Flow Field
Tomáš Hyhlík
Manufacturing Technology 2015, 15(5):842-845 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/842
The article deals with the analysis of axisymmetric flow field from the point of view of vortex identification. The vortex is identified by using residual vorticity defined in the work [1]. The identification is based on the so called triple decomposition of motion [1]. The idea of vortex identification based on the residual vorticity which is easily applicable in the case of two dimensional flow field is extended to the case of axisymmetric flow. The analyses is based on the decomposition of velocity gradient tensor and on the search of so called basic reference frame which allows to examine clearly the kinematics of the flow field.
The Using of Vehicle Moving Simulation to Proposal of Construction Work
Milan Chalupa
Manufacturing Technology 2015, 15(5):845-850 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/845
The article describes main possible usage of results of dynamic loading simulation with using of computational simulating system MSC. ADAMS. AVT and simulating computational model of track vehicle undercarriage. Main contens of article is the descripton of using of results for design value make-up file of changes of vehicle chassis parts and its new operating settings. The second described possibility of results simulation calculations usage is making - up of aproximate relations for transaction of fast orientation calculations. The next possibility of usage of simulation results is the possibility to verificate of mathematic model. The optimalization...
Pressure Analysis on the Surface Gearing Investigated by Numerical Simulation of Oil Flow in the Tooth Wheel Gap
Stanislav Jirouš, Karel Fraňa
Manufacturing Technology 2015, 15(5):850-853 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/850
The key topic of this article is a study of the oil flow and pressure distribution on the surface gearing investigated using numerical simulations. Particularly, this paper is focused on a simulation of the single flow of oil, which is governed by the gearing motion. Results of the unsteady flow between two rotating gearing could help to identify reasons of damages of gearings. The destruction of surface is identified after several hours on the helical gearing which is used in a heavy industry. In the case of moving and rotating gearing, it was necessary to use dynamic mesh and procedure of remeshing based on the parameters of quality cells. The simulation...
Numerical Simulation of Inviscid Compressible Fluid Flow Around Moving Bodies
Jitka Klečková
Manufacturing Technology 2015, 15(5):854-857 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/854
The article presents numerical code which was developed for solution of inviscid compressible fluid flow in domains with deforming boundaries. This computational method for the numerical solution of the non-linear system of Euler equations in time-dependent domains was designed as the first step of solution of fluid-structure interaction problem. Arbitrary Lagrangian - Eulerian (ALE) description of continuum, combining Eulerian and Lagrangian approach, was used to describe the inviscid fluid flow in time-dependent domain. The spatial discretization was provided by finite volume method adapted for triangular computational grids. Inviscid fluxes were...
Glass Furnace Controlling from Saving Energy Aspect
Frantisek Klimenda, Blanka Skocilasova, Petr Skuthan, Martin Močilan
Manufacturing Technology 2015, 15(5):857-860 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/857
The article is the possibility of energy saving of glass furnaces Bonacci when operating. A proposal to energy saving is aimed at changing of the control process of furnaces and installation of closing doors inlet and outlet ports of furnaces. By inlet and outlet ports of these continuous furnaces considerably leaks thermal energy when are not used (i.e. breaks at work). The doors are designed as a hollow panel, which is filled by isolation. This leads to a considerable saving of energy and to reduce of operating costs. The current control process of furnaces is now obsolete and can not flexibly changed it according a change of manufacturing products....
Measurement of Flow Characteristics in a Model of Aneurysm by PIV and FLIF Method
Jan Kolínský, Ludmila Nováková, Josef Adamec
Manufacturing Technology 2015, 15(5):861-865 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/861
The paper describes the flow measurement in an aneurysm model by PIV (Particle Image Velocimetry) and PLIF (Planar Laser Induced Fluorescence) method. The velocity field and the concentration were determined for four steady and one unsteady flow regimes.The area of the main flow and the area of liquid circulation in the region of the bulge were defined on the basis of velocity field measurement. Mean concentration of dye was evaluated in three areas: the entry to the model, the bulge of aneurysm and the outlet of the model. Concentration in course of time and residence time of dye are discussed on the dependance of unsteady flow.
CO2 Dispersion after Combustion
Tomas Korinek, Karel Frana
Manufacturing Technology 2015, 15(5):866-870 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/866
This study deals with a numerical simulation of CO2 dispersion after combustion of Ethanol. Numerical simulations were carried out with Reynolds averaged Navier-Stokes (RANS) approach. The mixture fraction theory was used for modeling of combustion. There were tested k-ε and k-ω turbulent models. Results obtained from numerical simulations were compared with results from an experiment.
Machinability of Lead Free Copper Alloys
Jan Madl, Vaclav Koutny
Manufacturing Technology 2015, 15(5):870-875 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/870
Lead is traditionally used for completing free-machining materials. This paper deals with newly developed lead free copper alloys. Unfortunately, lead affects the haematological and nervous system. Therefore, materials containing lead represent one of the greatest environmental problems in world production. Research Material Institute in Panenske Brezany (CZ) developed new environmentally friendly cooper alloys. Machinability of these materials was tested at the Department of Machining, Process Planning and Metrology CTU in Prague. Some of the research results related to the machinability from the viewpoint of chip forms, surface roughness, cutting...
A 3D Laser Scanner Setup for a Measuring of Geometrical Product Specifications
Pavel Macháček, Rudolf Dvořák
Manufacturing Technology 2015, 15(5):875-881 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/875
The laser line scanners are coming to be frequently used in a field of dimensional inspection process. There are several phenomena that make the data acquisition more difficult. Particularly secondary reflection, direct reflection, scan overlapping, outlying points. The effect of these phenomena can be minimised by optimal setting of scanning parameters stated in this paper. The parameters were determined from an experimental measurements of 50 various parts. Additionally a thermal stability effect was measured at two types of Nikon scanners. The stabilisation time and the systematic error were determined for the scanner LC15Dx: 45 min, 20μm and...
Induction Heating of Inner Rolling Bearing Ring in ANSYS
Pavol Novak, Vladimir Dekys
Manufacturing Technology 2015, 15(5):881-885 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/881
Aim of this paper is to explain capability of ANSYS to model induction heating of inner rolling bearing ring. This physical problem requires simulation of the interaction of three physical fields. First field is harmonic low-frequency electromagnetic, second transient thermal and third static structural analysis. The skin effect requires the fine mesh in areas near boundary of modeled ring in the vicinity of inductor. MFS concept is used to couple these three physical fields. Main result of this analysis is the thermal field history in inner ring. This analysis is used to obtain sensitivity data for appropriate shape and size of inductor to austenitize...
The Effect of Plasma Nitriding Parameters on the Thickness of Nitrided Layers
Ondrej Pilch, Frantisek Snahnican, Vojtech Hruby, Zbynek Studeny
Manufacturing Technology 2015, 15(5):885-889 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/885
This paper is aimed at chemical-heat treatment of a selected material. The plasma nitriding layers were applied on the 41CrAlMo7-10 steel. The influence of plasma nitriding parameters on the thickness and microhardness of nitrided layers were investigated. Plasma nitriding was performed at 500°C with a mixture atmosphere of H2 and N2 in the plasma nitriding equipment. The pressure of plasma nitriding process was determined to be 280 Pa. The period of the plasma nitriding process was changeable from 5 to 30 hours. The microstructure and mechanical properties of the nitrided layers were studied by using GDOES spectrometry, optical microscopy, and hardness...
Influence of Initial Carbon Concentration on Nitride Layers
Miroslav Pospíchal, Renata Dvořáková, Zbyněk Studený, Zdeněk Pokorný
Manufacturing Technology 2015, 15(5):889-893 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/889
The properties of plasma nitride layer are determined except technological parameters by chemical compositon and structure of steel. Experiments were carried out on ARMOX 500T steel. Firstly, the samples of steel were carburized and isothermal hardened. After quenching the course of microhardness was measured from surface to the core of material. Samples were cutted off on metallographic saw and subsequently grinded from the surface to the core of material. All depths of grinded surface from surface to the core were exactly defined. The chemical composition was verified in each prepared samples. Samples with changeable content of carbon were nitrided...
Analysis of Selected Thermodynamic Derivative Properties of Natural Gas Pipeline Flow Model
Ján Rajzinger, František Ridzoň, Milan Malcho, Jozef Jandačka
Manufacturing Technology 2015, 15(5):893-899 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/893
The thermodynamic derivatives based on fundamentals thermodynamic space and physical parameters of natural gas influences other variables of pipeline systems such as pressure, temperature, velocity, density, gas compressibility, etc. These variables are crucial for gas pipeline system knowledge and its accurate operation. Fundamental parameters are derived such as Joule-Thomson (J-T) coefficient, isothermal throttling coefficient and isentropic coefficient. They influence gas flow when during the expansion of natural gas in the pipeline, the gas cools down due to the J-T effect and due to the interaction between pipeline system and its surroundings...
High-Speed Cutting of Bearing Rings from Material 100Cr6
Josef Sedlak, Pavel Tropp, Josef Chladil, Karel Osicka, Petra Sliwkova
Manufacturing Technology 2015, 15(5):899-908 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/899
An article deals with a concept of increasing efficiency of a current production process of bearing ring machining. A goal is to substitute a generally expensive technology of cutting when at least the same integrity of a surface is kept. A theoretical part is focused on a characteristic and analysis of a given component including an applied material 100Cr6 from which bearing rings are made. A practical part analyses and suggests an innovation of increasing efficiency of the machining process. Series of samples would be tested experimentally at university conditions (Workroom C2 of Dept. of Machining Technology, Faculty of Mechanical Engineering, Brno...
Solidification of the Aluminium Alloy in the Mold
Blanka Skočilasová, Jan Skočilas
Manufacturing Technology 2015, 15(5):909-914 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/909
The process of the aluminum alloy casting was investigated. Two materials of the mold were used to observe the effect of thermal conductivity on the time of the solidification. The simulation of the process was conducted in the CFD software respecting the radiation. The results of the designed model of the casting process were compared with the analytical solution obtained from literature.
Homogenization of Fibers Reinforced Composite Materials for Simulation Analysis
Lukáš Smetanka, Juraj Gerlici, Tomáš Lack, Zoran Pelagić
Manufacturing Technology 2015, 15(5):914-920 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/914
The article is aimed to the development of homogenization procedures for fibers reinforced composite materials. The development of these procedures during the homogenization was performed by using a representative volume element (RVE). Two RVE versions were developed, hexagonal and square fiber arrangement. Both modules are automated and have been developed in the Python programming language with connection to FEM software Abaqus, which serves as a solver, and post processor. Afterwards the assembled modules follow homogenization of particular composite structures, which results are in a comparison with result gained from other homogenization methods...
Arctic Air Cooler
Josef Soukup, Petr Přibil, Blanka Skočilasová
Manufacturing Technology 2015, 15(5):920-924 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/920
The article deals with the design of a process recirculation air cooler for cooling natural gas when the latter is processed. The cooler is intended for extreme climatic conditions, and due to this reason, it is necessary when designing and fabricating the cooler to comply with the specific requirements for both the calculation and materials to be used on constructing it. In the winter period when the ambient temperature drops even below the solidification point of the medium the cooler works with reduced rpm of the fan, and when necessary, even in the recirculation mode, partial or full (depending on the ambient temperature). In this case, the inlet...
Numerical Simulation of Thermoelastic Stress Analysis
Zuzana Stankovičová, Vladimír Dekýš, Pavol Novák, Milan Sapieta
Manufacturing Technology 2015, 15(5):925-930 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/925
This paper focuses on verification of experiment of thermoelastic stress analysis by using numerical solution. Thermoelastic stress analysis is noncontact technique to obtain thermograms, thermographic images of the stress fields, by using an infrared camera. In the elastic part experimental results can be used to determine the value of the first stress invariant under adiabatic conditions. The experimental part is dedicated to the postprocessing of the measured data. Numerical solution was performed by finite element method in two softwares: ANSYS and ABAQUS.
Freight Long Wagon Dynamic Analysis in S-Curve by Means of Computer Simulation
Pavol Šťastniak
Manufacturing Technology 2015, 15(5):930-935 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/930
The article deals with the dynamic analysis of long freight wagon with a low and multifunctional loading plane for intermodal transport. The main task of simulation was to verify enough overlap of buffers, when the vehicle rides through S-curve, because the wagon is equipped with non-standard construction of the front part of undercarriage. Simulation was performed in program Adams, module VI-Rail. These and similar analyzes are nowadays an integral part of the development process of rolling stock and greatly reduce the time necessary for design, tests and certification of new vehicles. In the future, it will be possible in the case of verification...
Wagon Chassis Frame Design with Adaptable Loading Platform
Pavol Šťastniak
Manufacturing Technology 2015, 15(5):935-940 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/935
The paper present the structural design of freight wagon chassis frame with adaptable loading platform with regard to the safe operation and assessment of the properties by the calculation methods of simulation analysis. 3D model of wagon was created in a computer program PTC/Creo. Wagon chassis frame was subjected to the static and dynamic analysis in programs ANSYS and ADAMS/Rail. On the basis of computer aided simulation analysis was optimized the frame of the wagon. This wagon chassis frame will be able to offer even more capacity and utilize less resources and energy than current wagons for intermodal transport.
Automation of Filling Cryogenic Vessels with Perlite
Jan Štěrba, Valérie Černohlávková, Josef Soukup
Manufacturing Technology 2015, 15(5):941-944 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/941
Liquefied technical gases are used in almost all sectors, regardless of whether this is industrial application (engineering, food processing, electronics), as well as in health and other sectors. These gases are kept in cryogenic vessels. A cryogenic vessel is a two-walled vessel where the inner vessel is used to keep the gas, the outer vessel is used as packaging, and the space between the inner and outer vessels is thermally insulated. The insulation must have such parameters to ensure that the stored cryogenic gases remain in the liquefied state for the longest possible time. Various materials and methods are used to insulate the vessels, but the...
The Downhill Braked Railway Wheel Structural Analysis by Means of the ANSYS Multiphysics Program System Package
Andrej Suchánek, Jozef Harušinec
Manufacturing Technology 2015, 15(5):945-950 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/945
Article deals with the detection of reduced stress in a braked railway wheel based on thermal transient analysis on virtual models, because they influence the characteristics of the railway wheels. Structural analysis was performed by means of the ANSYS Multiphysics program system package. Thermal transient analysis deals with the detection of temperature fields which are result of braking by brake block. The applied heat flux represents the heat generated by friction of brake block. It is applied to the quarter model because of the acceleration calculation. This analysis simulates two braking with subsequent by cooling. Distribution of the equivalent...
Machining with Plastic Cutting Wedge
Karol Vasilko
Manufacturing Technology 2015, 15(5):951-957 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/951
The paper analyses the possibilities of modification of cutting tool geometry in order to preserve a protective plastic zone of material at a cutting tool. Based on the results of model experiment as well as practical verification, a rapid increase in tool life has been achieved. The tool life is dependent on the size of the shortened rake face. Optimization of the tool face size enables to achieve multiplied tool life when comparing with a classical cutting tool. A uniqueness of this processes is the formation of the two chips, one of which is a created plastic layer along the edge of the cutting tool. The application of the tool is possible only...
Steady Flow in Various Geometries of the Carotid Artery Bifurcation
Ondrej Vesely, Ludmila Novakova, Josef Adamec, Tadeas Balek
Manufacturing Technology 2015, 15(5):957-961 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/5/957
The paper presents results of experimental investigation of steady flow in the region of common carotid artery (CCA). The CCA bifurcates into two branches: into internal carotid artery (ICA) and external carotid artery (ECA). ICA, that supplies blood to the brain is enlarged. This region is referred as the carotid sinus. In the present study, three models of the carotid artery bifurcation have been manufactured. The models vary in geometry of the carotid sinus. Their effect on fluid flow has been investigated under steady flow condition, utilizing Particle Image Velocimetry (PIV) and flow visualization. The flow conditions approximate physiological...