Žilinská univerzita v Žiline

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Author: search.filters.author.Čerňan, JozefEnd date: 2021

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    Possibilities of using 3D printing technology in production of aircraft components
    (University of Zilina, 2021) Šajbanová, Kristína; Čerňan, Jozef; Janovec, Michal
    The article provides the reader with a brief overview of the technology of industrial 3D printing used in the manufacturing process of aerospace technology. It includes analyses of the position of 3D printing in the aerospace industry and the forecast of its future development based on the marketing analysis of strengths / weaknesses, opportunities and threats. Many airlines and AMOs (Approved Maintenance Organizations) rely on externally supplied spare parts delivered over long distances. The whole process is expensive and time consuming and means a lost profit for the company. The performed SWOT analysis can therefore ultimately help the AMO manager to re-evaluate their production process in the light of the current innovative and progressive technology of industrial 3D printing.The aim of this work is to point out the existence of innovative 3D printing technology in aerospace production and to emphasize its preferences compared to conventional manufacturing techniques and procedures, thus providing a final perspective on the future of the 3D printing industry and its long-term sustainability
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    Wing magnetohydrodynamic facility of aircraft propulsion system
    (University of Zilina, 2021) Miča, Pavol; Čerňan, Jozef
    Magnetohydrodynamics is one of the relatively new fields of physics studying the dynamics of magnetic fields in electrically conductive fluids. The implementation using magnetohydrodynamic principles applied to aircraft propulsion systems is so far only in a range of experiments. So far, real applications have occurred only a few times and always only at the level of experiments and prototypes. In my paper, I deal with the application of a magnetohydrodynamic device built into the wing of an airplane. This means should work as a secondary type of drive in cooperation with the primary drive, which is represented by a turbofan motor. The device´s main function is to reduce the fuel requirements of the primary drive and reduce noise and other harmful emissions. The work also includes drawings created in the program AutoCAD, where I designed the location and implementation of a wing magnetohydrodynamic device in the wing of general construction. In this work, I also explore the advantages and disadvantages of using different tips of the primary drive. I am also researching the current state of the problem where I am analyzing the Japanese project of the YAMATO-1 semi-catamaran with magnetohydronymous propulsion and a prototype of an ion-powered crawler from IMT scientists. I also examine in detail all the theoretical knowledge concerning magnetohydrodynamics and wing design. Finally, I compare the advantages and disadvantages of using this tool as well as other technical issues related to construction. This work can serve as a basis for further future research into the application of magnetohydrodynamic principles in aviation
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    Design optimization of a compressor stage with counter-rotating rotors
    (University of Zilina, 2021) Šajbanová, Kristína; Čerňan, Jozef
    The paper deals with the design optimization of the compressor stage with counter-rotating rotors, especially in order to create a model which, due to its parameters in real operation, would achieve the maximum possible values of efficiency. The primary goal of this work is to create a design of a compressor stage with counter-rotating rotors from a theoretical point of view. The compressor stage model is created using Inventor modelling software and the subsequent design evaluation and optimization is based on airflow analysis of the compressor stage using Ansys Discovery Live software. The secondary goal is to point out the existence and application of innovative and progressive technology of rapid prototyping in the world of aircraft component production and at the same time to emphasize its benefits in comparison with conventional production techniques applied in the initial stages of aircraft component production.
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    Design of a bladeless engine compressor based on magnetohydrodynamics
    (University of Zilina, 2021) Stachová, Jana; Čerňan, Jozef
    This article is a technical analysis focusing on the design of a bladeless compressor based on magnetohydrodynamics and the possibilities of its use. The aim of this work is to design new solutions in the field of aircraft compressors and to provide a comprehensive overview of scientific information on the topic. Emphasis is also placed on acquainting the reader with the basic principles of magnetohydrodynamics and the possibilities of its application in the field of aircraft propulsion units. The work is a combination of professional research of scientific information in the field of plasma and magnetohydrodynamics and a practical part whose goal is to create new design of a bladeless compressor using scientific observation and modelling methods. This design was also examined in the work using the method of comparison, which aimed to examine the design and its behaviour in different configurations. The main goal was to combine essential and key information from the researched area and apply it in a completely new way in designing new solutions in issued area
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    Possible modifications of the automobile piston petrol engine for aircraft propulsion: cooling, starting and ignition system
    (University of Zilina, 2021) Malíková, Zuzana; Čerňan, Jozef
    The main goal of our work was to design a possible modification of the automobile piston petrol engine for aircraft propulsion and subsequently its implementation. The paper can be divided into four main units. The first part is aimed on the history and development of automobile and aircraft piston engines. We focused on their construction and gradual improvement of performance. The second unit is dedicated to theoretical knowledge of the cooling, starting and ignition systems. In the cooling system, we mainly described air cooling and the required components needed for that process. In the starting system, we paid attention to the necessity of starting gears, their types and uses. We described mainly electric starters and then we attached a diagram of the starting system. In the ignition system, we described the structural elements required for the process of igniting a mixture of fuel and air. In the following section, we described the engine used for aeroconversion, its parameters and the reason for its selection. In the last part we deal with the practical part of the paper. We created the component models needed for the complete construction of these systems, which were created in the computer program Autodesk Inventor Professional 2021. We prepared the cooling system for more efficient air cooling by adding deflectors, in the starting system we used a starter with a reducer to increase torque and reduce fuel consumption and in the ignition system, we proposed a modification of the flywheel made of dural material, which would reduce the overall weight of the engine. The result of our work is a finished design for aeroconversion of a flat four-cylinder engine. The modified engine is suitable for ultralight aircraft.
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    Modification possibilities of automotive power plant for aviation purposes: fuel system and turbocharger system
    (University of Zilina, 2021) Pukač, Andrej; Čerňan, Jozef
    The objective of this article is to develop and demonstrate modification of automotive engine for aviation purposes. Automotive engine in aircraft has its pros and cons, but It can be good economical alternative to power plants such as Rotax engines which can be expensive, especially in Ultralight category where the rules of certification are different than for CS-LSA or CS-23 category aircraft. In first part I analyse actual state of real engine and describe operational problems, which shall be improved for better operation in aircraft. In second part I demonstrate practical solutions of turbocharger system and fuel system. In these systems I tried to use the most modern technologies which however will be reliable enough for aviation use, where the safety is priority number one.
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    Design of lubrication system, design of motor bed, selecting of propeller for aircraft piston engine
    (University of Zilina, 2021) Suk, Michal; Čerňan, Jozef
    I will briefly address the three orientations of my paper in this scientific article. I will not go into details in the article. In the first part I will briefly describe the design procedure of a piston engine lubrication system, the requirements that a lubrication system should meet with respect to different types of piston engines and their focus, elements of the lubrication system and the properties of oils as lubricating fluids.In the next part I will describe the types and constructions of aircraft engine beds, technical requirements for aircraft engine beds and individual loads that the aircraft engine bed must withstand. In the last part I will focus on aircraft propellers. I will explain the basic principle of the propeller, the individual rules for selecting a propeller for a piston engine, safety requirements for an aircraft propeller and the dividing of basic types of aircraft propellers for aircraft piston engines.
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    System optimization demonstrator for aircraft propulsion technology using fuel cells
    (University of Zilina, 2021) Uhlár, Erik; Čerňan, Jozef
    In order to help accelerate transition to sustainable and eco-friendly personal transportation in a single engine piston aircraft category we’ve developed a simulation software platform of hydrogen powered aircraft for further research and development. Measurements were carried out on a real reference airplane Cessna 172 R and were crosschecked with an airplane flight manual as well as a computer flight simulation. We also focused on a software-based safety and economy optimization by components usage ratio improvement and inflight energy production and transfer limitations.
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    Ignition systems of combustion piston engine and possibility of its optimization
    (University of Zilina, 2021) Vorlíček, Marek; Čerňan, Jozef
    This paper explains the basic definition of ignition, combustion and description of the ignition system functionality. The ignition systems are divided according to established criteriums into the most used types and descriptions of each ignition system components. It focuses on ignition timing and circumstances that affect it and how they influence the observed parameters. I am using ignition timing as an instrument for the observation and optimization of ignition. These practices are tested on piston engine in the practical part of this paper. It describes the modification of the timing curve, measuring of engine power and comparison between each curve. It is an analysis of engine performance under different conditions. The most efficient timing curve is chosen and further evaluated. The used engine for this paper was a rebuild from a car engine used in Trabant 601, VEB Automobilwerke automobile.
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    METHODOLOGY FOR INSPECTION OF RIVETED SAMPLES BY THE ECA METHOD
    (Žilinská univerzita v Žiline, 2020) Janovec, Michal; Čerňan, Jozef
    The eddy current method is very often used technique of non-destructive testing and evaluation of materials. The method is very suitable for the detection of cracks that result from fatigue or cracking as a result of stress corrosion. Eddy current testing can be performed with minimal part preparation and a high degree of sensitivity. The eddy current method is used for the detection of surface and subsurface failures, corrosion in aircraft structures, holes for fixing various components and thread cracks. The paper describes the application of the eddy current method ECA in the inspection of riveted joints of the produced sample. The riveted sample is made of aluminum sheets and countersunk head rivets. Simulated damages are created around the rivet holes on the riveted specimen. Artificially formed notches simulate cracks around the rivet holes, and aluminum powder is used to simulate corrosion of aluminum sheets. These damages are then scanned with an Olympus OmniScan MX flaw defectoscop and the results of the measurements are evaluated in this article. SAB-067-005-032 and SBB-051-150-032 are used for non-destructive measurements.