PREPARATION AND CHARACTERIZATION OF TiO2 THIN FILMS FOR UV SENSOR


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201520

LIDIYA BEDIKYAN1, STOIL ZAKHARIEV1, PAVEL KEJZLAR2, LUKAS VOLESKY2, МARGARITA ZAKHARIEVA1, NIKOLAY PETKOV1, PETR LOUDA2
1 Central Laboratory of Applied Physics – Bulgarian Academy of Sciences, Plovdiv, Bulgaria
2 Institute for Nanomaterials, Advanced Technology and Innovation, TU Liberec, Czech Republic

e-mail: lid_bed@yahoo.com

Abstract
Nanosized TiO2 thin films were deposited by conventional vacuum thermal evaporation and triode-cathode sputtering of Ti on silicon and quartz substrates. To form TiO2 a high temperature annealing of the Ti films was carried out in the range of 450÷800 ºC. The optical properties of TiO2 were studied by measuring UV-VIS transmittance spectra and the indirect band gap was evaluated. Scanning electron microscope (SEM), atomic force microscope (AFM) and energy-dispersive spectroscopy were employed for surface and structure analysis.
Structures for UV sensors were formed by thermal evaporation of various combing contacts on the TiO2/Si substrates. The photoresponse of the structures was detected in the wavelength range of 235÷420 nm. An increase in photocurrent with an order of magnitude was detected by exposing samples to UVA illumination and applying 6÷10 V bias voltage. The obtained results indicated that the studied structures are suitable for UV sensors.
Keywords: titanium dioxide, spectral characteristics, band gap, surface analysis, UV sensor

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OPTIMIZATION OF SNAP-FIT DESIGNS WITH RAPID PROTOTYPE TECHNOLOGY SUPPORT


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201421

MARTIN SEIDL, JIRI HABR, JIRI BOBEK, LUBOS BEHALEK, PETR LENFELD
TU Liberec, Department of engineering technology, Liberec, Czech Republic

e-mail: martin.seidl1@tul.cz

Abstract
This article is focused on the design of demountable joints that have to meet high safety requirements. In total two snap-fit geometries were designed in two, respectively three modifications. These constructional solutions could be divided into two categories (easily deformable mounting elements and mounting elements deformable with difficulty). Several evaluating criteria were chosen. The most important ones were adequate strength, tightness and reliability of the resulting joint. Geometry of the snap-fit has to be also easy demouldable from the production tool and also manufacturability have to allow maximum user comfort during the assembly process. Optimization of snap-fit geometries was performed with utilize of numerical analysis and for the evaluation the prototypes created by 3D printing technology were used.
Keywords: snap-fit, demountable joints, assembling, plastics parts


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FILM THICKNESS MAPPING IN LUBRICATED CONTACTS USING FLUORESCENCE


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201524

DAVID NECAS, PETR SPERKA, MARTIN VRBKA, IVAN KRUPKA, MARTIN HARTL
BUT, Faculty of Mechanical Engineering, Institute of Machine and Industrial Design, Brno, Czech Republic

e-mail: necas@fme.vutbr.cz

Abstract
The present paper presents experimental method for film thickness mapping inside the contact of two bodies. Despite extensive experimental research in the area of contacts of rigid bodies, little is known about the film formation when at least one of the bodies is compliant. This is due to limitations disabling the usage of conventional methods. In present study, mercury lamp induced fluorescence is developed and applied. Evaluation process is verified by comparing theoretical predictions and experimental data for piezoviscous-elastic contact of ceramic ball and glass disc. Consequently, phenolic sample is used as a representative of compliant material. The contact was lubricated by mineral oil and the experiments were carried out under pure rolling conditions. Film thicknesses in a range from 50 nm to 1.2 um were measured for compliant contact. The measured data are little bit lower compared to theory, indicating that thermal effects may influence the lubricant film.
Keywords: isoviscous, elastohydrodynamic, film thickness, fluorescence, compliant


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EXPERIMENTAL INVESTIGATION OF LUBRICATION FILM FORMATION AT START-UP OF SMOOTH SURFACES


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201529

PETR SVOBODA, DAVID KOSTAL, IVAN KRUPKA, MARTIN HARTL
BUT, Faculty of Mechanical Engineering, Institute of Machine and Industrial Design, Brno, Czech Republic

e-mail: svoboda.pe@fme.vutbr.cz

Abstract
Many machine components are operated under transient conditions that can cause the lubrication film breakdown. In such a case, surface interactions can lead to wear and significantly reduce life of these components. Start-up of the machine components to the relative motion is one of the transient phenomenon where surfaces are not fully separated by a continuous layer of lubricant. This article summaries relevant studies and extends it with experiments. The evaluation of the experiment was made by chromatic interferometry. This method is used to measure thin lubrication films. Measurements were carried out using an additive-free paraffinic base oil. An experimental study on lubrication film formation during start-up of smooth non-conformal contacts operated under pure rolling conditions was carried out. Experiments for different values of low acceleration quite good agree with theoretical and experimental results.
Keywords: EHD lubrication, transient, film thickness, start-up, non-conformal contact


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MANUFACTURING MULTI-AGENT SYSTEM WITH BIO-INSPIRED TECHNIQUES: CODESA-PRIME


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201543

LUKAS DURICA, BRANISLAV MICIETA, PETER BUBENIK, VLADIMIRA BINASOVA
UNIZA, Faculty of Mechanical Engineering, Department of Industrial Engineering, Zilina, Slovak Republic

e-mail: vladimira.binasova@fstroj.uniza.sk

Abstract
This paper deals with the multi-agent manufacturing system with application of bio-inspired techniques and new approaches to the development trends of advanced industrial engineering (AIE) in energy efficient manufacturing. This integration represents a sustainable development so that more effective use of natural and energy resources is achieved and energy costs are reduced. The new solution of reference model for control and coordination decentralized systems - CODESA is proposed. Centralized architecture suffers from various problems, such as rigidity, scalability, low fault-tolerance or very limited ability for flexibility, agility and productivity. Prime is concrete application of CODESA in manufacturing domain. Its concrete application, CODESA-Prime, was verified in simulation logistics multi-agent system.
Keywords: multi-agent system, sustainable production, advanced industrial engineering, biologically inspired techniques, CODESA-Prime


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IMPROVEMENT OF HEAVY MACHINE TOOL DYNAMICS BY PASSIVE DYNAMIC VIBRATION ABSORBER


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201545

TOMAS BREZINA1, LUKAS BREZINA2, JAN VETISKA3
1BUT, Faculty of Mechanical Engineering, Institute of Automation and Computer Science, Brno, Czech Republic
2BUT, Faculty of Mechanical Engineering, Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno, Czech Republic
3BUT, Faculty of Mechanical Engineering, Institute of Production Machines, Systems and Robotics, Brno, Czech Republic

e-mail: brezina@fme.vutbr.cz

Abstract
The article deals with evaluation of frequency responses of heavy machine tool for different attachment places of dynamic absorbers or dynamic vibration neutralizers in order to substantially suppress vibrations occurring during a machining process. The approach is based on methodology utilizing a multi-body model of a machine tool with flexible bodies in linear state-space form with added structure representing the absorber. The proposed methodology significantly decreases elapsed time requirements and makes possible to efficiently optimize even complicated problems. There are compared results obtained by utilization of two different objective functions as well as results for dynamic vibration absorber and neutralizer in the article.
Keywords: machine tool, vibrations, state space LTI, dynamic vibration absorber, optimization


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LASER MARKING OF METAL MATERIALS


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201410

LYDIA SOBOTOVA1, PETER DEMEC2
1TUKE, FME, Department of Process and Environmental Engineering, Kosice, Slovakia
2TUKE, FME, Department of Production Techniques , Kosice, Slovakia

e-mail: Lydia.Sobotova@tuke.sk

Abstract
The contribution deals with the implementation of new information from the area of laser marking processing. The marking of various types of metal and non-metal materials are very actual topic of these days. The focus is on the production technical aspects of laser engraving and the introduction of processing strategies. Less attention is paid to the complex chemical process that can be observed when using laser as a tool chance the visible material appearance. The aim is to identify the parameters and guidelines that can be used to control the laser engraving process in the production environment. The problem of engraved metal material surface is discussed in solved experiments. The aim of the contribution is visual and microscope evaluation, how by changing of laser parameters can chance the influence on the final visage of tested metallic materials.
Keywords: laser technology, marking system, material


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STUDY OF SUSPENSION CHARACTERISTICS BY USING FLEXIBLE SUBFRAME


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201546

TOMAS VRANA1, JAN KOVANDA2, JOSEF BRADAC3
1CULS Prague, Faculty of Engineering, Department of Vehicles and Ground Transport, Prague, Czech Republic

2CTU in Prague, Faculty of Transportation Science, Department of Security Technologies and Engineering, Prague Czech Republic
3Skoda Auto University, Department of Automotive Technology, Mlada Boleslav, Czech Republic

e-mail:vrana.ds@seznam.cz

Abstract
This paper analyzes the impact of subframe flexibility of single-axle suspension on elasto-kinematic properties of axles. Geometrical parameters of the suspension, such as camber angle β and toe angle α and their change upon vertical movement of the wheel or when exposed to longitudinal and lateral forces affect very significantly driving properties of the vehicle. Using HyperWorks simulation software the computational multibody system (MBS) of axle suspension coupled with the flexible model of axle and longitudinal arms reflecting their flexibility was created. These models were developed using the method of synthesis of natural modes Craig-Bampton. The model further comprises force elements such as springs, shock absorbers and transverse stabilizer and contains nonlinear deformation characteristics of rubber-metal bushings. The effect of the subframe flefibility has been studied in several structural variants using different material. Elasto-kinematic calculations were validated by experimental measurements on measuring device for the axle alignment.
Keywords: single-axle suspension, MBS model, subframe flexible model, camber angle, toe angle, hyperworks


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IMPACT RESISTANCE OF LATTICE STRUCTURE MADE BY SELECTIVE LASER MELTING FROM AlSi12 ALLOY


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201547

RADEK VRANA1, DANIEL KOUTNY1, DAVID PALOUSEK1, TOMAS ZIKMUND2
1BUT, Department of Mechanical Engineering, Brno, Czech Republic
2BUT, Central European Institute of Technology BUT, Brno, Czech Republic

e-mail: vrana@fme.vutbr.cz

Abstract
This article describes the impact resistance of lattice structure made by metal additive technology Selective Laser Melting using AlSi12 aluminum powder material. Powder particle distribution was analyzed for verification of distribution and shape of particles. Samples of lattice structure are consisted of three segments. The main part – lattice structure is made from repeated Body Centered Cubic (BCC) unit-cell composed of four thin trusses. The other parts are thin plates on upper and bottom side of the sample. Four series of BCC lattice-structured samples with different diameter of the truss were designed. The samples were tested by the impact testing device with the spherical shape of indenter. During tests the samples were fixed to the base plate using four bolts.
The measured data were used for calculation of the absorbed energy using numerical integration in software MATLAB. The results show that the BCC structures with the diameter of the truss d = 0.8 mm have the best combination of stiffness and energy absorption for the parameters of the impact test.
Keywords: Selective Laser Melting, lattice structure, impact resistance, particle distribution, energy, AlSi12


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VIBRATION DIAGNOSTICS OF ROLLING BEARINGS USING THE TIME SERIES ANALYSIS


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201548

DAVID KUTALEK, MILOS HAMMER
Brno University of Technology Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: ykutal01@stud.fme.vut.cz

Abstract
Rolling bearings are an important part of most machines with rotating parts. Therefore, their technical diagnostics is an essential condition for ensuring the safe operation of the machine. This article focuses on the assessment of the condition of bearings using one of the methods of technical diagnostics - vibration diagnostics. In our case it is determination of the value of diagnostic variables of rolling bearings with a subsequent prediction of their condition based on the evaluation of time series analysis. Theoretical knowledge and practices are verified based on measurement data obtained from single-row ball bearings of type 3208A in the manufacturer test room.
Keywords: rolling bearing, vibration diagnostics, time series, decomposition model


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EXPERIMENTAL ANALYSIS ON MACHINABILITY OF ALUMINUM ALLOY USING WEDM TECHNOLOGY


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201549

KATERINA MOURALOVA, JANA DVORAKOVA, JAROMIR DVORAK, JIRI KOVAR, ZDENEK KARPISEK, PETRA SLIWKOVA
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: dvorakova.j@fme.vutbr.cz

Abstract
Wire electrical discharge machining (WEDM) is unconventional method commonly used for manufacturing of components with difficult shapes or profiles. It is very useful for machining
very small – micro components with high dimensional accuracy and quality of surface finish. This technology allows even cutting of very hard materials, provided they are conductive. First part of this paper deals with machining aluminium alloy AlZn6Mg2Cu, setting of cutting parameters and measuring properties such as surface roughness and cutting width (kerf) of the machined samples. The second part is focused on studying of machining process using design of experiments (DOE) methods and analysis of variance (ANOVA), especially for identifying of key parameters that have influence on the WEDM process. The aim of this work is to explore the possibility, whether if by performing planned experiment and subsequent evaluation in the future allows determining exactly setting the key parameters influencing the process of WEDM.
Keywords: WEDM, machining of Aluminium alloys, analysis of machinability, DOE, Analysis of variance ANOVA


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BORE QUALITY OF SHOTGUN BARREL BLANKS


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201550

ROBERT JANKOVYCH, MILOS HAMMER, MATEJ HARCARIK
BUT, Faculty of Mechanical Engineering, Institute of Production Machines, Systems and Robotics, Brno, Czech Republic

e-mail jankovych@fme.vutbr.cz

Abstract
This paper provides a novel manner of shotgun barrel bore surface texture specification. The current state of shotgun barrel blank bore surface texture specification and measurement is analyzed. Comparative measurements of samples with good and inferior surface quality are used to demonstrate the shortcomings of current specifications. In seeking improvement, six profile parameters are evaluated and their sensitivity to prevalent surface imperfections is determined. Similarly, six areal parameters are evaluated, and suitable measurement settings are determined for the most sensitive one. The parameters are ranked according to their level of sensitivity to change in bore surface quality. Based on all of the above, profile and areal parameters particularly suitable for specification of shotgun barrel bore surface texture are singled out.
Keywords: surface texture, surface metrology, firearms, shotguns, barrel blanks, radial forging


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QUALITATIVE MODEL OF PERFORMANCE SHAPING FACTORS IN HRA


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201551

LEISAN MUKHAMETZIANOVA, LUBOS KOTEK, MIRKO DOHNAL
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: y150051@stud.fme.vutbr.cz

Abstract
A lot of Human Reliability Analysis (HRA) methods calculate human error probability (HEP) based on different performance shaping factors (PSF). In calculating HEP, interdependency is generally ignored or addressed through varying parameters in linear or loglinear formulas [Groth 2009]. These dependencies could be more precisely represented by a qualitative model of PSF relationships. The aim of this paper is to describe the interdependence of the factors affecting human reliability using the method of qualitative modeling. Interdependencies between factors were based on different investigations. Appropriate qualitative relations were chosen for each pair of factors, and using a specific computer program, different scenarios were created.
Keywords: human reliability analysis, human error, performance shaping factors, qualitative model


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MEASUREMENT-INDUCED WEAR OF ALUMINIUM ALLOY PARTS


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201552

ROBERT JANKOVYCH, MARTIN WEIGL, JAN KUR
BUT, Faculty of Mechanical Engineering, Institute of Production Machines, Systems and robotics, Brno, Czech Republic

e-mail: martin.weigl@mesing.cz

Abstract
This article presents influence of measuring probes on a dynamically measured part made from automotive aluminium alloy. Dynamic measuring (during rotation or translation) is limited not only by scanning rate of measuring sensors and processing devices, but also by physical and metrological attributes of measuring probes, which are in direct contact with the measured part. Current trend in automotive industry is to reduce weight, production costs and input materials costs, while achieving higher precision of manufactured parts. Due to these reasons, aluminium alloys with high volume of silicon are used more often than before. However, dynamic measuring of such parts presents difficulty, as the probes and measured parts interact. This interaction was the subject of the research made by Mesing Ltd. in cooperation with University of Technology Brno. The unexpected absence of adhesive wear in cases of Al2O3 and WC tips make them the most suitable materials for aluminium alloy measuring.
Keywords: dynamic measuring, measuring probe, black diamond, Dutch diamond, measuring in automotive


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CONTRIBUTION TO DIAGNOSTICS OF ASYNCHRONOUS MOTORS


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201553

VLADIMIR VESELKOV, MAXYM ZHALO, ANDREI TURYGIN, MILOS HAMMER, ROBERT JANKOVYCH
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: y150050@stud.fme.vutbr.cz

Abstract
Asynchronous motors are a frequent power member of electric drives. In engineering practice their reliability is important. Although the available literature indicates a high reliability of these machines, in many applications reliability needs to be monitored and evaluated. A significant role in this process occupies technical diagnostics. Engineering practice knows a considerable amount of diagnostic methods; for our purposes, the important ones are the following: vibration and noise diagnostics, thermodiagnostics, electrodiagnostics, etc. The results of diagnostics can be evaluated in different ways; the present paper demonstrates the use of fuzzy expert systems, in particular it deals with a partial problem related to the application of vibration diagnostics. Based on the measurement of values of vibrations of the experimental stand, its fault has been clearly identified.
Keywords: diagnostics, asynchronous motor, electric drive, expert system, fuzzy expert system, fuzzy subsystem, angular misalignment


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ERROR MOTION ANALYSIS OF MACHINE SPINDLE UNDER LOAD


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201554

JOSEF KNOBLOCH, TOMAS MAREK, ZDENEK KOLIBAL
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: knobloch@fme.vutbr.cz

Abstract
The present paper deals with a novel approach to the analysis of machine tools under load; it identifies the parameters of machine tool spindles simulating a real cutting process. The main focus of the paper is on evaluation of synchronous and asynchronous error motions and their dependency on spindle speed and load. To investigate the errors, a hydraulic load unit is used. This unit exerts a uni - or bidirectional force located between the spindle and the machine table. Behaviour of the load unit was also investigated. For the purposes of simulating a real cutting process, working conditions between 500 - 5000 rev / min and loads in the range of 50 - 500 N were analysed. Results can be used for evaluation of spindle parameters, prediction of machining accuracy and improvement of the cutting process.
Keywords: spindle error, measurement, load unit, spindle modelling


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CONTRIBUTION TO MAINTENANCE ISSUES IN COMPANY PRACTICE


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201555

HANA OPOCENSKA, MILOS HAMMER
BUT, FME, Inst. of Production Machines, Systems and Robotics, Dept. of Quality, Reliability and Safety, Brno, Czech Republic

e-mail: y126604@stud.fme.vutbr.cz, hammer@fme.vutbr.cz

Abstract
Currently, companies are more and more interested in the issues of maintenance. The present article provides basic information about maintenance, describes its development stages; it also refers to the classification of maintenance
and analyses the maintenance systems used in practice. Moreover, some modern approaches to maintenance are presented and supported by selected specific cases from engineering practice.
Keywords: maintenance, classification of maintenance, systems of maintenance, preventive maintenance, after-failure maintenance, total production maintenance, reliability centered maintenance


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A DESCRIPTION OF METHODS AND TECHNIQUES OF SAFETY CULTURE RESEARCH


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201556

IRINA FEDORYCHEVA, MILOS HAMMER
BUT, FME, Dept. of Quality, Reliability and Safety, Inst. of Production Machines, Systems and Robotics, Brno, Czech Republic

e-mail: y168272@stud.fme.vutbr.cz

Abstract
According to the analysis of disaster investigation, written safety plans can be effective, but its insufficient condition for maintenance optimal safety level. It is also necessary to ensure creating a true safety culture. As reported by S. Mohamed (2005), this fact highlights the need not only to better understand the role played by the organizational and behavioral variables, but also to measure their individual contributions in creating and nurturing a true safety culture. In order to improve the safety culture of a company, the most important aspect is proper assessment of the current level of safety culture. The main objective of this paper was to review the main methods of analysis (measurement) the safety culture applied in different industries and countries. As the analysis of the literature there is no perfect approach, each method has its advantages and disadvantages.
Keywords: safety culture, Delphi method, sociometry, ethnographic research, questionnaire


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VIBRATION DIAGNOSTICS ON A HYDRAULIC ROTATOR


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201557

TOMAS BUDIK, ROBERT JANKOVYCH, MILOS HAMMER, TADEAS LIPUS
BUT, Faculty of Mechanical Engineering, Institute of Production Machines, Systems and Robotics, Brno, Czech Republic

e-mail: budik@fme.vutbr.cz

Abstract
This article focuses on the philosophy of vibration diagnostics on an Indexator hydraulic rotator. Following the analysis of the construction and machine functions, defect frequencies are calculated. The vibration measurement system for the technical diagnosis of the rotator were then designed. According to the vibrations measured on the GV6 rotator, limits for a new machine are proposed (the boundary between zones A and B).
Keywords: rotator, zones boundary, vibration diagnostics


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STUDY OF CHANGES FOR SELECTED FIRE PARAMETERS AT ACTIVATION OF DEVICES FOR SMOKE AND HEAT REMOVAL AND AT ACTIVATION OF FIXED EXTINGUISHING DEVICE


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201558

JIRI POKORNY1, MARIANNA TOMASKOVA2, MICHAELA BALAZIKOVA3
1Fire Rescue Service of the Moravian-Silesian region, Ostrava-Zabreh, Czech Republic
2 TUKE, Faculty of Mechanical Engineering, Institute of Safety and Quality of Products, Kosice, Slovakia
3 TUKE, Faculty of Mechanical Engineering, Institute of Safety and Product Quality, Kosice, Slovakia

e-mail: jiri.pokorny@hzsmsk.cz

Abstract
This article demonstrates changes of the selected parameters of fire development using a fire model, which is applied in the case of chosen fire example (simulated fire). There is analysed an influence of the active fire-safety devices on the fire parameter changes (in the Part No. 3 – Discussion of Results). The main purpose of this article is to present a basic importance of the active fire-safety devices for a realistic description of the course of fire using the chosen example of fire. Such description is important for performing of the fire-engineering evaluations.
Keywords: course of fire, change of conditions, active fire safety devices, CFAST


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A DESCRIPTION OF SAFETY TRIAD MODELS OF SAFETY CULTURE AS A TOOL IN HUMAN PERFORMANCE RESEARCH


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201559

IRINA FEDORYCHEVA, MILOS HAMMER
BUT, FME, Dept. of Quality, Reliability and Safety, Inst. of Production Machines, Systems and Robotics, Brno, Czech Republic

e-mail: y168272@stud.fme.vutbr.cz

Abstract
The human factor plays a decisive role in most accidents, but the problems caused by them are still unresolved. Understanding safety culture will help the industry to allocate safety resources and improve occupational health and safety performance. The paper presents an overview of the main existing triad models. The models in this paper can be used to illustrate components of the system, psychological elements of the people in the system and their individual and collective behaviours in terms of system performance. Some models describe ‘components’ of culture, others attempt to explain the relationship between safety culture and outcomes, and some models in the area describe the factors that interact to cause workplace safety incidents.
Keywords: safety culture model, reciprocal determinism, organization culture, human performance 


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SYSTEM APPROACH TO DETERMINATION OF RESULTING GREEN HOUSE GAS EMISSIONS OF ENGINEERING PRODUCT


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201560

MARIA KRBALOVA, PETR BLECHA
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: iskandirova@fme.vutbr.cz

Abstract
Recently, it has been possible to observe toughening of requirements to reduce environmental burden and environmental profile of products. While the first requirements were rather general, in the course of time they have toughened and focused on spheres that most considerably affect the environment, namely, on energy-related products. According to high energy consumption in the industrial sector, an increase of legislative requirements for engineering products is also expected. Currently, majority of environmental legislation also apply to engineering products. This development should draw an attention of machinery manufacturers to the changes planned for the near future that they can also be concerned with. The present article is devoted to the development of methodology for evaluation of environmental burdens caused by greenhouse gas emissions (in this case it is carbon dioxide) arising from production of engineering materials (e.g. cast iron); from mining and processing of raw materials to casting and transporting of finished product to the site of its subsequent processing.
Keywords: carbon dioxide emissions, cast iron, energy consumption, Life Cycle Assessment


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THE APPROACHES OF ADVANCED INDUSTRIAL ENGINEERING IN ENERGY EFFICIENCT MANUFACTURING


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201561

BRANISLAV MICIETA, VLADIMIRA BINASOVA, MICHAL HALUSKA
UNIZA, Faculty of Mechanical Engineering, Department of Industrial Engineering, Zilina, Slovak Republic

e-mail: vladimira.binasova@fstroj.uniza.sk

Abstract
This paper deals with new approaches to the development trends in the advanced industrial engineering (AIE) in energy efficient manufacturing. This integration represents a sustainable development so that more effective use of natural and energy resources are achieved and energy costs are reduced. The progress of energy efficiency improves the competitiveness of manufacturing enterprises and reduces the stress on environmental impacts of production processes. Technologies of advanced industrial engineering, new energy efficient technologies and energy efficiency standards are important for sustainability and competitiveness in production management. Energy and environment related research has contributed strongly to energy efficiency. There is also described ZIMS (Zilina intelligent manufacturing system) as a new, open and collaborative environment, supporting creativity, inventing new solutions, increasing energy efficiency and their practical implementation in the form of new innovative products.
Keywords: energy efficient manufacturing, sustainable production, advanced industrial engineering, cost optimization


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ASPECTS OF PRESSURE SEWERAGE SYSTEM DESIGN


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201562

JAN RUCKA1, TOMAS SUCHACEK1, JIRI KOVAR2, ONDREJ ANDRS3
1 BUT, Institute of Municipal Water Management, Faculty of Civil Engineering, Brno, Czech Republic
2 BUT, Institute of Automation and Computer Science, Brno, Czech Republic
3 BUT, Institute of Production Machines, Systems and Robotics, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: rucka.j@fce.vutbr.cz

Abstract
The article deals with some aspects and uncertainties of the design and operation of low pressure sewer systems. The most frequently used types of pumps are compared in the text with respect to the design parameters and impact to the hydraulic analysis of the pressure system. Also different methodologies of estimation of design flow are compared with the flow that was measured on the real low pressure sewer. The document describes the currently ongoing project of applied research, which focuses on optimizing the operation of pressure sewerage systems.
Keywords: low pressure sewer, waste water, hydraulic analysis, research, back-flow valve, flow analysis, pressure measurement


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QUALITY OF DIMENSIONS ACCURANCY OF COMPONENTS AFTER WEDM DEPENDING ON THE HEAT TREATMENT


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201563

KATERINA MOURALOVA, JIRI KOVAR
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: mouralova@fme.vutbr.cz

Abstract
The main purpose of this paper is to examine the gap width of the wire cut after WEDM depending on the heat treatment of machined material - high-alloy steel X210Cr12. This steel is usually used for the production of cutting tools. Cutting gap occurs during the discharge between the tool electrode and the machined material. This discharge causes melting of microscopic particles of the workpiece; the particles are then washed out from the place of the discharge by dielectric, which creates small craters. The size of the cutting gap is a limiting factor for the manufacture of internal radius and also it affects the final dimensions of the machined part. The heat treatment has an effect on the grain size and hardness of the material which results in a huge evaporation of the material and its subsequent leaching from the cutting place. The amount of evaporated and leached material was examined on the groove with width of 3 mm produced by WEDM to 4 differently heat treated steel samples X210Cr12. For cutting of all grooves the same parameters of the machine settings were used. The grooves were cut into four sections in order to achieve the highest possible dimensional accuracy.
Keywords: WEDM, electrical discharge machining, heat treatment, kerf width, steel X210Cr12


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MACHINE TOOL HEALTH AND USAGE MONITORING SYSTEM: AN INTITIAL ANALYSES


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201564

LUDEK JANAK, ZDENEK HADAS
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic

e-mail: hadas@fme.vutbr.cz

Abstract
In order to be competitive on a present-day machine tool market, it is needed to produce a high quality, highly reliable systems with low operating and overall lifecycle costs. Health and usage monitoring systems are one of the promising technologies which are being developed to support this effort. The health and usage monitoring systems have been widely employed in the aerospace branch where the condition based maintenance can save maintenance costs and provide higher reliability. In the field of machine tools it is becoming increasingly important because the maintenance costs often exceed 30% of the overall operating costs. The main aim of this paper is a methodical introduction of the health and usage monitoring systems to the machine tools branch. This process has to start with in-depth analyses of machine tool functions and components. Consequently, the review of relevant standards is provided.
Keywords: machine tools, health monitoring, usage monitoring, HUMS, sensors, reliability, industry 4.0


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SOFTWARE QUALITY CONTROL WITH THE USAGE OF IDEAL AND TMMI MODELS


MM (Modern Machinery) Science Journal, December 2015
DOI: 10.17973/MMSJ.2015_12_201565

PETR BRIS, MICHAL FRANTIS, MONIKA KOLKOVA
UTB, Dept. of Industrial Engineering and Information Systems,Faculty of Management and Economics, Zlin, Czech Republic

e-mail: bris@fame.utb.cz

Abstract
Our work focuses on process of software testing with the regard on his control and quality securing. Theoretical part explains basic terminology used later in our work. It explains the terms such as quality, process control management or software. Later our work describes software testing in relation with methodology of software development, quality improvement of process testing with the usage of model TMMi and modelling of processes.
Project part consist of process analysis of current state of software testing process. Identified subprocesses are modelled and inserted into Process Cards. Identified imperfections are then subjects of solution proposal for improvement of software quality control testing process. Afterwares the proposal is implemented on the current state of software testing process with the goal to achieve second level of software testing process maturity according to model TMMi.
Keywords: quality control, software testing, TMMi, modelling, competitiveness


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