CAPILLARY VELOCITY OF NATURAL ZEOLITE POROUS CERAMIC IN DIFFERENT SINTERING TEMPERATURES

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_2016104
SRI MULYO BONDAN RESPATI, RUDY SOENOKO, YUDY SURYA IRAWAN, WAHYONO SUPRAPTO, WAHID BUDI SAPUTRA, HELMY PURWANTO
1 Wahid Hasyim University, Mechanical Engineering Department, Semarang, Indonesia
2 Brawijaya University, Mechanical Engineering Department, Malang, Indonesia
e-mail: bondan@unwahas.ac.id
Abstract
Lately, the membrane of porous ceramics begin to increase its utility since it contains good and supportive chemical substances, besides it is also resistant to heat and has stable force. However, its price is considered quite expensive because this type of ceramics is made from materials and is produced through complicated process. This study aims at utilizing the use of natural zeolite materials as the material to use for membranes which offers low price. This material can be used as a membrane because of its unique physical and chemical characteristics and it contains liquid adsorbent. In this study, the natural zeolite was obtained from Malang, Indonesia. Porous ceramic sintering is a process of ceramics making by baking the ceramic at the temperature of around 700–900 °C. In this study, the porosity and capillary velocity cylindrical porous ceramic were investigated. Density and porosity of the material were measured using the Archimedes method (ASTM C20). The capillary absorption coefficient was calculated using the standard MSZ EN 1925: 2000. The result of this study shows that the higher the sintering temperature, the greater the density and the smaller the open porosity produced in the process which increases the capillary velocity. This phenomena occured due to the greater driving force which makes the pores of porous ceramics made of natural zeolite and the capillary velocity is increased.
Keywords: ceramic, sintering, natural zeolite, porous, capillary
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IMPACT OF TOPOLOGY AND MAP PRECISION ON DESIGNED FLOW IN RAIN SEWERS

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_2016147
STEFAN STANKO, DUSAN RUSNAK, IVONA SKULTETYOVA, MICHAL HOLUBEC, KRISTINA GALBOVA
Slovak University of Technology, Faculty of Civil Engineering, Department of Sanitary and Environmental Engineering, Bratislava, Slovak republic
e-mail: dusan_rusnak@stuba.sk
Abstract
Sewer systems are undisputable part of environmental protection system. Design, construction and correct management of sewer systems eliminates or at least mitigates continual infiltration of sewage water to the environment and ground water. Verification of correct function of sewer system is done by the assessments. This study focuses on impact of terrain topology, placement and geometry of structures in area, precision and actuality of maps that serve as input data in calculation of runoff coefficients, creation of sub-catchments and the choice of model hectare. Those values have direct impact on the calculation of the amount of rain water in sewer system and thus help determine possible flooding of system. Study was conducted on existing sewer system in town of Vrable as a part of greater thesis dealing with verification of boundary conditions that serve as data in sewer system assessments.
Keywords: sewer system, rain sewer, assessment, runoff coefficient, catchment
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RECYCLING OF AUTOMOTIVE SHREDDER RESIDUE BY GRANULOMETRIC SEPARATION

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_2016153
SIMONA SOBEKOVA – FOLTOVA1, TOMAS HAVLIK2, ANDREA MISKUFOVA2
1 Katholic University Leuven, Department of Chemistry, Laboratory of Inorganic Chemistry, Heverlee, Belgium
2 Technical University of Kosice, Faculty of Metallurgy, Institute of Recycling Technologies, Kosice, Slovak Republic
e-mail: simona.sobekova@kuleuven.be
Abstract
Recycling of end-of-life vehicles at shredder plants, among well-managed metal recycling, ends up with huge amounts of waste residue, for which the complex recycling route is still missing. Automotive shredder residue (ASR) is often called light fraction, because after the separation of all the metal particles (by magnetic drum, eddy-current, pneumatic separator and multiple unites of sieving) it contains mostly non-metallic materials like plastics, rubber, wood, paper, textile, leather or glass. There is a small content of metals (Fe, Cu, Zn, Cr, Ni), but is low and the value of other materials cannot cover the costs for multi-stage recycling of light fraction. However, the presence of heavy metals and their compounds (~ 5 wt %) is the reason why is the light fraction classified as a hazardous waste.
The possibility to separate the metal-bearing part of a light fraction based on the granulometric differences in contained materials has been investigated. The system of test sieves was used for the granulometric separation and sample was divided into following granulometric classes + 50 mm, - 50 + 25 mm, - 25 + 15 mm, - 15 + 10 mm, - 10 + 0 mm. Material of the grain size < 10 mm was grinded down on a mortar grinder and sieved further to + 0.5 mm, - 0.5 + 0.315 mm, - 0.315 + 0 mm. The obtained fractions were subjected to chemical analysis for the content of Fe, Zn, Cu, Ni and Cr and the material recycling has been proposed.
As for gaining both, metals and potential secondary fuel, method of sieving was compared with more complicated process consisting of sieves, magnetic separator, eddy-current separator and air separator.
Keywords: end-of-life vehicle, light fraction, ASR, sieving, recycling, heavy metals
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PASSIVE TORQUE SIMULATION OF SMALL ANGULAR CONTACT BEARING AT HIGH SPEED

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201701
JOSEF KEKULA, JAN SMOLIK, MATEJ SULITKA
Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Production Machines and Equipment, Prague, Czech Republic
e-mail: j.kekula@rcmt.cvut.cz
Abstract
In order to predict heat generation in super precision ball bearings at high speeds the Harris and Houpert frictional models were applied to a high speed range with maximum speed of 150 000 RPM. The measurement of thermal behaviour in super precision ball bearings was observed on a high speed spindle for micromilling. Outer ring bearing temperature and torque was measured simultaneously under stable lubrication conditions set by the oil-air lubrication unit. Measurement was performed via our custom built non-driven spindle on a special test rig. The complex thermo-mechanical model of the spindle unit was used to determine high speed spindle behaviour on super precision high speed ball bearings. Torque models were compared with experimental data and its deviation from real torque was observed. Following our testing this proposal to modify the Houpert torque model was designed.
Keywords: ball bearings heat generation, high speed spindle, thermo-mechanical simulation of spindle, oil-air lubrication
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LOAD CONTROL POSSIBILITIES OF EXPERIMENTAL LINEAR DRIVE

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201702
KAMIL SUBRT, PAVEL HOUSKA, RADEK KNOFLICEK
Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic
e-mail: subrt@fme.vutbr.cz
Abstract
The article describes a load drive extension for an existing laboratory experimental equipment for testing of linear drives with ball screw. The main aim is to simulate the static component of the load, and therefore the pneumatic actuator has been selected. The control elements (electro-pneumatic valves) and appropriate control strategies are also investigated. The experiment was performed with two valves exactly on the extended device and comprised of examining the behavior of the monitored system and basic capabilities of pressure-force regulation. The experiment set-up directly corresponds with the proposed use of this extension. The achieved results illustrate the ability of the load system to simulate primary the static forces. Finally, the adaptation and development are presented to improve not only the dynamic abilities of the loading system.
Keywords: experiment, pressure control, control, pneumatics, ecodesign
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OPTIMIZATION OF THE HCR GEARING FROM PITTING DAMAGE POINT OF VIEW

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201704
MIROSLAV VERES, MIROSLAV BOSANSKY
Institute of Transport Technology and Design, Slovak University of Technology in Bratislava, Slovak Republic
e-mail: miroslav.veres@stuba.sk, miroslav.bosansky@stuba.sk
Abstract
Pitting damage as a result of contact stress on the gears teeth flanks is one of the most important problems needing to be solved in the process of gearing design and calculation. According to current valid standards, such calculations can be resolved with a high level of reliability for all the usual gearing types. However, suitable calculations for HCR gears have not been adequately researched to date. It has been identified that in HCR gears some different process of pitting formation occurs during the gear‘s operation. In this article, the authors present original results of the HCR gearing research and describe a new method for finding optimal solutions for  ,   and x1, using a Generalized Particle Swarm Optimization Algorithm.
Keywords: HCR gearing, GPSO algorithm, contact, ratio coefficient, pitting, slip ratio, optimizing of the geometric parameters
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DETERMINATION OF CERTAIN PARAMETERS OF A BEARING

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201705
MARTIN KRATOCHVIL
University of West Bohemia, Faculty of Mechanical Engineering, Department of Machine design, Pilsen, Czech Republic
e-mail: kratochv@kks.zcu.cz
Abstract
The article deals with the development of a more accurate method for determining certain parameters of a bearing in the early stages of the engineering design process. Using the traditional approach, the parameters of the given parts are estimated by experience. Another method is to make a simple estimation of basic static or basic dynamic load rating, which is inaccurate if is applied. Following this step a potential bearing is chosen from a catalogue and is recalculated or replaced, which provides the inputs for optimization. The approach described in this paper can be used to estimate the mentioned parameters with regards to the load value and its duration.
Keywords: ball bearing, load spectrum, optimization, determination, selection
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NEW MATERIALS CHARACTERIZATION APPROACHES IN COMPUTER AIDED DESIGN

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201706
JAN DZUGAN, ANTONIN PRANTL, MARTIN RUND, MIROSLAV URBANEK, RADEK PROCHAZKA, VACLAV KUBEC
COMTES FHT Inc., Dobrany, Czech Republic
e-mail: jan.dzugan@comtesfht.cz
Abstract
Improvements in computer simulation, materials characterization and lowering of design safety margins leads to significant decrease of components mass. In order to maintain functions and increase components service reliability while reducing their mass, new approaches describing closer material behaviour and in service component properties are applied. The current paper is shoving recent trends contributing to improvement of the forming technology and components design thanks to improved material models and local properties measurements for flat and bulk components. Complex material models taking into account multiaxial loading conditions together with approaches considering load path history influence on material deformation behaviour are presented here. Additionally, local properties measurement with the use of miniaturized tensile specimens is presented here that provides data for anisotropy and local properties assessment that are applied to models tuning and verification.
Keywords:
ductile damage, strain path influence, small size testing, triaxiality
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FAILURE PREVENTION IN MAINTENANCE SERVICES AND LOGISTICS

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201708
CHRISTIAN DIETRICH1, NAQIB DANESHJO2, MIRWAJS DANISHJOO3
1Federal Office of Bundeswehr Equipment, Information Technology and In-Service Support, Koblenz - Germany
2University of Economics in Bratislava Faculty of Business Economics with seat in Kosice, Kosice, Slovak Republic
3Enter price, San Antonio, Texas, United States of America (USA)
e-mail: daneshjo47@gmail.com
Abstract
The authors within the scientific contribution present the Preventive and non-routine maintenance activities on aircraft demand for varying priorities, service provider have to ensure a maximum of flexibility. Key competences for Maintenance, repair and overhaul (MRO) operators are permanent availability, a short respond time, continuous access to current information and real-time process monitoring for customers. Company specific material logistics analyzes the transfer operations of consuming goods to the place of in-house processing (spatial, temporal and quantitative). In the age of globalization a variety of partners work together in logistic chains.
Keywords: logistics chains, quantitative, maintenance, quality, real time, quality interfaces, flexibility management
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QUALITY MANAGEMENT MAINTENANCE OF AIR TRAFFIC

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201709
NAQIB DANESHJO1, MILAN MAJERNIK1, ENAYAT DANISHJOO2, JANA KRIVOSUDSKA3
1University of Economics in Bratislava, Faculty of Business Economics with seat in Kosice, Kosice, Slovak Republic
2Thk rhythm automotive GMBH, Duesseldorf, Germany
3Technical University of Kosice Faculty of Mechanical Engineering, Slovak Republic
e-mail: daneshjo47@gmail.com
Abstract
The authors within the scientific contribution present the maintenance task to provide aircrafts ready for flight. Engineering standards and the framework of international and national air law are fundamental for efficient and reliable aircraft maintenance services. The present thesis provides an insight into general maintenance fundamentals, legal requirements and into actual organization of this business. The second step is to identify optimization potential in scientific-validated and condition-based maintenance, spare part logistics and in applied quality management systems. Due to this optimization potential a new quality management approach is created on a scientific basis, it considers the identified gaps of the present systems.
Keywords: quality management systems, maintenance, logistics, optimization
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INFLUENCE OF MACHINED SURFACE SHAPE ON LIGHT ABSORPTION

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201710
ONDREJ BILEK1, MARTIN VASINA1,2
1Tomas Bata University in Zlin, Department of Production Engineering, Zlin, Czech Republic
2Technical University of Ostrava,  Department of Hydromechanics and Hydraulic Equipment, Ostrava, Czech Republic
e-mail: bilek@utb.cz
Abstract
There are different factors that have influence on light absorption of a given material, e.g. material colour and thickness, angle of light incidence, surface shape, roughness, porosity and surface cleanliness. This paper is focused on material ability to absorb light. For this reason, different surface shapes of a polyvinylchloride material were produced on CNC milling machine. There were investigated the effect of width, depth and number of differently shaped grooves on light absorption in this paper. It was found in this study that the effect of the surface shape has a significant influence on light absorption. This fact was verified by a computer simulation, which was performed using Wdls 4.1 software.
Keywords: CNC machining, surface shape, light absorbance, groove, illuminance, computer simulation
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FEM-AIDED MATERIALS SELECTION OPTIMIZATION

MM (Modern Machinery) Science Journal, June 2017
DOI: 10.17973/MMSJ.2017_06_201711
PAVEL FLORIAN, IVANA MAZINOVA, MARTIN KRATOCHVIL, FILIP HRDLICKA
University of West Bohemia, Pilsen, Czech Republic
e-mail: mazini@kks.zcu.cz
Abstract
During the design process materials selection is usually carried out unsystematically, selection is mostly based on previous experience. Professor M. Ashby developed a methodology of materials selection optimization based on material indexes. Our aim is to link this methodology with optimization interface of software ANSYS. This link allows solving complicated multi-criteria problems that cannot be solved analytically. In this paper it was shown that it is possible to create connection between material selection methodology based on material indices and numerical finite element method analyses conducted in ANSYS. New material indices were determined for buckling of a cylinder. The developed methodology is also applicable for more complicated problems which is the next step in this research.
Keywords: materials selection optimization; material indices; ANSYS; FEM; CES EduPack; DOE, MATLAB
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