Žilinská univerzita v Žiline
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Item Design procedure and honeycomb screen implementation to the air transtport department’s subsonic wind tunnel(University of Zilina, 2020) Hrúz, Michal; Pecho, Pavol; Bugaj, MartinWind tunnels are the most widely used tools when comes to validation of Reynold number. Most of wind tunnels use various air straighteners or flow conditioners to achieve as most unified air flow as it’s possible. This article deals with design and creation procedure of air flow straightener – honeycomb screen. Based on mathematical relations and empirical experience defines dimensions and characteristics for subsonic wind tunnel of the Air Transport Department of University of Žilina. Wind tunnel equipped with a suitable screen provides more relevant and accurate data, which are crucial for final validation of results of test objects.Item Study of reinforcement design h-profile of aircraft wing spar(University of Zilina, 2020) Pecho, Pavol; Magdolenová, Paulína; Hrúz, Michal; Kováčik, Pavel; Škvareková, IvetaIn today's world, with ever-increasing safety requirements, there is a growing demand to maintain or reduce production costs. In aviation, in addition to factors like weight and related variables such as resistance to vibration, corrosion, temperature and other are also considered. The task of this paper is to analyse unconventional designs of wing beams with respect to the current requirements of the aviation industry. In the article, the authors analyse the possibilities of design modification either by adding ribs to the profile, or by changing the cross-section of the profile itself. In practice, such design changes would increase weight, production time and finances, but also increase strength and thus safety. All proposed changes were subjected to strength analyses by FEM (Finite element method) computer simulations. The article output is the selection of suitable designs for further observation and experimental verification to ensure comprehensive results for the possibility of implementation in practice. Despite the non-traditional shapes of the proposed wing beam cross-sections, the authors assume that traditional beam shapes will be gradually modified more efficiently.Item Experimental state of thrust testing of aircraft reciprocating internal combustion engine(University of Zilina, 2020) Mrva, Matúš; Pecho, Pavol; Hrúz, Michal; Škvareková, Iveta; Bugaj, MartinThe project “Experimental State of Thrust Testing of Aircraft Reciprocating Internal Combustion Engine” is aimed at creating a complex measuring device in order to obtain selected characteristics and parameters of the engine using different types of propellers. In addition to the basic measured parameters such as. thrust, temperature, speed and fuel flow will be a state of the art to test the latest prototype propellers designed for aircraft models. After its construction, the experimental state will be used as a study aid for testing various types of conventional as well as currently developed propellers, engine characteristics and teaching of the whole equipment in the process of teaching, training of aircraft mechanics and for presentation purposes of the University of Žilina.Item FAILURE RATE ANALYSIS IN AIRCRAFT MAINTENANCE PROCEDURES(Žilinská univerzita v Žiline, 2020) Bugaj, Martin; Pecho, Pavol; Janovec, MichalAn aircraft is a complex object composed of many complicated and interrelated parts, components and systems. Reliability of all parts and systems is very important to aircraft because operation of aircraft can affect flight safe directly. Aircraft failure rate is an important parameter of aircraft operation to maintain the effective level of reliability. The failure rate is the probability of failure at a point in time. When a part, component or system is not functional it can be upgraded through replacement or repair, and the condition of the aircraft is restored to some degree. We can defined several approaches to aircraft maintenance. There are maintenance can be based on condition, which is, items are repaired when they fail. Failure during operation can have serious consequences, so detection of items with a high probability of failure through periodic inspection is a major component of maintenance. This paper analyses how we can define the aircraft failure rate and its impact on operational reliability of aircraft.Item FMEA ANALYSIS OF AUTOMATIC RESCUE PARASCHUTE SYSTEM FOR CIVIL AVIATION(Žilinská univerzita v Žiline, 2020) Pecho, Pavol; Gáborová, Miroslava; Škvareková, Iveta; Ažaltovič, ViliamThe article analyzes the topic of rescue parachute systems, with a focus on pilot parachutes used by civic aviation pilots in emergency situations. The work is in addition to pilot parachutes, focused and most ballistic rescue systems for aircraft and firing parachute systems, which fulfill an equally important role in aviation. The issue was analyzed by FMEA analysis, which was applied to the automatic rescue system. The outcome of this study is the evaluation criteria of current technical systems to reduce the risk number “R”. For each of the safety enhancement solutions, the article contains a separate proposal for technical improvements that are suitable for implementation in practice. Such solutions ultimately represent an increase in civil aviation safety as such.Item THE MEASUREMENT OF PILOT WORKLOAD(Žilinská univerzita v Žiline, 2020) Škvareková, Iveta; Ažaltovič, Viliam; Pecho, Pavol; Kandera, BranislavThe article is focused on objective measurement of pilot workload during IFR flight. For the purpose of our research, we decided to use eye monitoring technology to record eye movements to determine the pilot's performance. Eye monitoring provides data on the number of eye movements,number of visual intakes, number of saccades, number of blinks, fixations and the durations of these. Our study incorporated overall six pilots divided into two groups: the experienced and inexperienced. The measurements were performed on the ELITE S923 flight simulator located at Žilina airport, Dolný Hričov. Measurement and analysis of the data showed that the pilots showed significant deviations when comparing the two pilot samples. We also demonstrated various scanning techniques during ILS and NDB approaches. The conclusion of our work summarizes the measurement results and the use of eye track technology in the future.Item PRAVDEPODOBNOSŤ NEHODY BEZPILOTNÉHO LETECKÉHO PROSTRIEDKU NA ZEMI V OBÝVANEJ OBLASTI(Žilinská univerzita v Žiline, 2020) Ažaltovič, Viliam; Škvareková, Iveta; Pecho, Pavol; Kandera, BranislavThe study in this paper defines the amount of the possible ground casualty risk of randomly falling out-of-control UAV on a picked flight path, which was defined from the city of Žilina to the city of Martin, which were 29 km apart. For this area, the probability of a third party casualties caused by lose of control during the flight of UAV, was calculated. For these calculations was used the Equivalent Level of Safety approach. The conclusion provides recommendations for safety improvements during planning flight routes for unmanned aerial vehicles.Item NÁVRH IMPLEMENTÁCIE SENZOROV SYSTÉMU ARDUINO V MODELI DEMONŠTRAČNÉHO VETERNÉHO TUNELA(Žilinská univerzita v Žiline, 2020) Rilko, Dávid; Pecho, PavolThe intention of the paper is to acquaint the reader with the basics of aerodynamics and to clarify the theory of wind tunnels, their division, construction, functionality and today´s use. The work also documents the construction proces of a wind tunnel, which took place on Žilina Airport with cooperation with employees of the Department of Air Transport and its students. The work captures the process of tunnel design until its completion. The main point is the design of the wind tunnel measuring system. The work thoroughly explains the procedure for designing, connecting, programming and calibrating measuring elements and creating an overall system for measuring data for a closer understanding of aerodynamic events. The conclusion of the work is a comparison of the measuring system used in construction and the systems used in world research centres from a technical as well as an economical point of view.Item SYSTÉM MERANIA AERODYNAMICKÝCH SÍL V DEMONŠTRAČNOM VETERNOM TUNELI(Žilinská univerzita v Žiline, 2020) Veľký, Patrik; Pecho, PavolThe purpose of the article was to solve a part of the wind tunnel, specifically part of the measurement of wind forces. The work deals with the mechanism by which it is possible to determinate the values of bouyancy, downforce and drag of the object, which is attached to the system. The work takes into account the conditions under which the mechanism had to be constructed. Selection of suitable material due to price and quality, dimensional conditions, method of measuremnt system itslef and output from the mechanism. In addition to the design itself, the scope of work also included a summary of the current state in the field of aerodynamics and wind tunnels, an analysis of current requirements for the operation of wind tunnels and a final summary from a technical and economic point of view. At the beginning of the work are summarized the basics of general aviation and the importance of aerodynamics associated with it. The second part of the work is a wind tunnel, its importance for aviation and then its design and construction of a functional mechanism for measuring the required parameters. Due to the fact that the wind tunnel was built by students and employees of the University, the work includes its own practical experience.Item NÁVRH A KONŠTRUKCIA MODELU DEMONŠTRAČNÉHO AERODYNAMICKÉHO TUNELA(Žilinská univerzita v Žiline, 2020) Hrúz, Michal; Pecho, PavolThe paper is focused on the creation of a fully functional demonstrational model of a subsonic wind tunnel with integrated accessories, using low air velocities to perform test analyses. The analyses take place in the form of visual demonstrations of the air flow behavior around various solids and also in the form of computational tasks. The paper describes the use of theoretical knowledge and laws in the field of aerodynamics and their subsequent connection to the design and construction of the model, while its dimensions must meet the strict requirements for subsequent placement. The demonstrational model provides the necessary equipment for research in the aerospace and, in part, automotive industries. It provides conditions for student research and fully covers the teaching processes of Air Transport Department.