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  Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 124 journals)
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  This is an Open Access Journal Open Access journal
ISSN (Print) 1648-7788 - ISSN (Online) 1822-4180
Published by Vilnius Gediminas Technical University Homepage  [15 journals]
  • Unsteady fluid flow in pressurised closed pipes in experimental bench

    • Authors: Michał Stosiak, Kamil Urbanowicz, Krzysztof Towarnicki, Adam Deptuła, Paulius Skačkauskas, Tadeusz Leśniewski
      Pages: 67–7 - 67–7
      Abstract: The paper indicates the frequent occurrence of transient states in hydraulic systems. Particular attention was paid to the phenomenon of water hammer – the causes and effects of this phenomenon. A complete analytical description of this phenomenon has not yet been developed. New theoretical models are still being developed and need to be verified experimentally. The paper focuses on presenting the development of experimental stands for the study of water hammer in hydraulic pipes. Subsequent modifications of the experimental stands for the speed of the shut-off valves and their tightness, as well as for the minimisation of the occurrence of the effects of the pulsation of the performance of the pump supplying the line under investigation, are presented. The stand presented as the final one also allows the testing of transients in hydraulic lines for various types of working fluid (oil, emulsion, distilled water).
      PubDate: 2023-04-25
      DOI: 10.3846/aviation.2023.18914
      Issue No: Vol. 27, No. 2 (2023)
  • Flight phase classification for small unmanned aerial vehicles

    • Authors: Jakub Leško, Rudolf Andoga, Róbert Bréda, Miriam Hlinková, Ladislav Fözö
      Pages: 75–8 - 75–8
      Abstract: This article describes research on the classification of flight phases using a fuzzy inference system and an artificial neural network. The aim of the research was to identify a small set of input parameters that would ensure correct flight phase classification using a simple classifier, meaning a neural network with a low number of neurons and a fuzzy inference system with a small rule base. This was done to ensure that the created classifier could be implemented in control units with limited computational power in small affordable UAVs. The functionality of the designed system was validated by several experimental flights using a small fixed-wing UAV. To evaluate the validity of the proposed system, a set of special maneuvers was performed during test flights. It was found that even a simple feedforward artificial neural network could classify basic flight phases with very high accuracy and a limited set of three input parameters.
      PubDate: 2023-05-05
      DOI: 10.3846/aviation.2023.18909
      Issue No: Vol. 27, No. 2 (2023)
  • Digitalization in aircraft maintenance processes

    • Authors: Iyad Alomar, Irina Yatskiv (Jackiva)
      Pages: 86–9 - 86–9
      Abstract: Aircraft maintenance is considered as one of the major expenditures of aircraft operating costs. Notwithstanding that the new aircrafts, engines, and aircraft hard time parts became more durable and maintainable, the maintenance cost is still too high as against other costs like fuel and operational crews. Moreover, aircraft maintenance should be carried out with a high level of safety and security standards. All aircraft maintenance operations are subject to regulations by regulatory authorities. Such authorities can be attributed to European Union Aviation Safety Agency (EASA), Federal Aviation Administration (FAA) and National Civil Aviation Authorities (NAA). The last two decades have become a turning point in the transition from the paper form of the introduction of accounting for aircraft maintenance technical operations into electronic systems, despite all the difficulties associated with these procedures. Such difficulties are not limited to regulatory authorities, personnel training and investment which is case-sensitive for small companies. Similar to all other sectors of logistics and transportation, digitalization can be one of the key engines of change in aviation, especially in the aviation maintenance; thus, the study of digitalization effects on aircraft maintenance processes at present is an important factor for improving the maintenance processes and reducing the cost of aircraft maintenance. The objective of this research is to define the ability of aircraft maintenance and repair organizations to transform their processes. To that end, a data collection method in the form of a survey was implemented within Maintenance, Repair and Overhaul Organizations (MRO) and among aircraft maintenance engineers. The survey results demonstrate that the aircraft maintenance industry is not yet fully prepared for moving into digitalization in aircraft maintenance processes. However, at the same time, the study indicates the readiness of the personnel involved in the industry to improve themselves and their skills. The industry should invest in the improvement of safety and quality of tasks subject to digitalization by means of development of reliable software/hardware, and provide suitable training for safety and quality personnel.
      PubDate: 2023-05-05
      DOI: 10.3846/aviation.2023.18923
      Issue No: Vol. 27, No. 2 (2023)
  • Investigation of the application of CPDLC to aerodrome air traffic control

    • Authors: Julius Žvinys, Darius Rudinskas
      Pages: 95–1 - 95–1
      Abstract: This paper analyzes the application of Controller Pilot Data Link Communication (CPDLC) technology to different air traffic control sectors. It also presents the analysis of the performed research and tests. A CPDLC program is being developed that is adapted for aerodrome flight control. The program takes into account the advantages and disadvantages of other software, as well as the recommendations of other authors. The program is developed using JAVASCRIPT and HTML programming languages. The tests of the developed CPDLC program are performed in the Expert NITA flight control simulator. The CAPAN method is used for data analysis. Analysis of changes in workload, language errors, and time saved using different communication methods during simulations is also performed.
      PubDate: 2023-06-20
      DOI: 10.3846/aviation.2023.19113
      Issue No: Vol. 27, No. 2 (2023)
  • Major air disasters: accident investigation as a tool for defining eras in
           commercial aviation safety culture

    • Authors: Cristina Mínguez Barroso, Daniel Muñoz-Marrón
      Pages: 104– - 104–
      Abstract: The air transport evolution has been littered with major air disasters, the occurrence of which has not only had the negative effects inherent to any disaster. Air accident investigation has provided a wealth of knowledge that has advanced the aviation industry and its safety. International Civil Aviation Organization has exercised international regulatory leadership since 1947, developing tools with international cooperation, such as the air accident investigation methodology. ICAO has forged a change in perspective on safety attributions or factors in different historical eras, using this methodology to deepen the understanding of the causes and thereby achieve aviation safety improvement.
      Authors aimed to analyze, through a detailed study of the world’s worst aviation accidents, their contribution to understanding the details of aviation safety culture. Beyond the technical issues and fatality rates, the necessary analysis is what knowledge researchers have gained from the beginning, exploring the attributions of reports and knowing what diverse factors have predominated in different eras. Descriptive analyzes of air disaster investigation have two objectives: to identify the beginnings of a global safety culture resulting from evolution in operational safety and to relate the different eras to the attributions of air accident investigations.
      PubDate: 2023-06-20
      DOI: 10.3846/aviation.2023.19244
      Issue No: Vol. 27, No. 2 (2023)
  • Mathematical model of stable equilibrium operation of the flight simulator
           based on the Stewart platform

    • Authors: Petro Volodymyrovych Lukianov, Volodymyr Volodymyrovych Kabanyachyi
      Pages: 119– - 119–
      Abstract: This paper analyses the available mathematical models of flight simulators based on the Stewart platform. It was found that there is no model that describes the conditions for stable dynamic equilibrium operation of the Stewart platform as a function of a number of important motion parameters. In this context, a new physical model is proposed based on classical models of theoretical mechanics using the d’Alembert formalism, the concept of stable equilibrium of a mechanical system. This model mathematically separates the stable equilibrium of the flight simulator motion system from the general uniformly accelerated motion. The systems of equations obtained in the framework of the model connect the physical and geometrical parameters of the Stewart platform and make it possible to determine the reactions in the upper hinges of the platform support, the limit values of the position angles in the space of the base of the support of the Stewart platform, under which the condition of stable equilibrium operation of the Stewart platform is satisfied. The proposed physical model and the analytical relations obtained on its basis are of great practical importance: the operator controlling the operation of the Stewart platform-based flight simulator can control the range of parameters during training so as not to bring the flight simulator out of stable equilibrium.
      PubDate: 2023-06-21
      DOI: 10.3846/aviation.2023.19264
      Issue No: Vol. 27, No. 2 (2023)
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