DOI 10.51955/2312-1327_2024_4_

Dmitry E. Strokov

Evgenia A. Achkasova

Oksana G. Boyko 

Abstract. The authors constructed a mathematical model for changing the parameters of an aircraft engine for use in the ECTM (Engine Condition Trend Monitoring) system, which will allow for the maintenance of foreign-made aircraft under sanction restrictions based on the airline data.

The mathematical model was constructed with the regression analysis method on the basis of statistical data of PT6A-114A engines technical operation over a five-year operation period. The proposed solution allows the values of the basic parameters of the PT6A-114A aircraft engine to be obtained, the operator having the opportunity to independently analyze the trends of changes in the engine condition without the ESTM system. The main advantage of the obtained research results is independence of the aircraft operator on foreign engine parameter assessment services. The airline can assess the engine parameters independently. One of the next stages of further implementation of the ECTM system within the airline is the development of software that will automate the process of reading the aircraft engine parameters, conduct their analysis and correlate to the engine operation and maintenance documentation and issue a plan of corrective actions on the engine and its components.

Keywords: aircraft engine, parameters, regression analysis, basic values, maintenance.

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DOI 10.51955/2312-1327_2024_4_

Nikolay V. Danilenko

Anton G. Kirenchev

Abstract. The article describes vortex formation in the atmospheric medium and analyzes the research on this topic. The main contradictions and problems in the study of vortex formation are revealed. The working process of transforming the initial potential flow of working body of the medium under study into vortex flow with the description of the main factors influencing this process is considered. The contradictions in the process of vortex tube formation are revealed, for which a new object of research was chosen – specific linear density of vortex circulation of gas (liquid) natural and anthropogenic media. The state and problems of the specific linear density of vortex circulation of the investigated vortex formation are assessed. The definition of specific linear density of circulation on the basis of its working process is presented. The correlation between the linear circulation density and the tangential velocity of the medium on the outer surface of the vortex tube is established. The definition of the theorem on the linear circulation density of a vortex tube is given. The proof of the theorem and the mathematical relationship of the linear density of medium vortex tube circulation and the tangential velocity on its outer surface are given. Corollaries of the theorem and their applications are presented.

Keywords: vortex formation, generation factors, working process, definition, theorem, classification, linear density of circulation, vortex tube, aircraft engine air intake vortices, tornadoes.

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DOI 10.51955/2312-1327_2024_3_103

Gennadiy V. Kovalenko

Ivan S. Muravyev

Ilya A. Yadrov

Abstract. The formalization of the activities of pilots in the controlling of the latest generation aircraft (AC) is experiencing difficulties due to significant changes in the structure of human activity – the operator. For the most complete analysis of the procedure for controlling the activities of pilots when using various levels of automation, it turns out to be not enough to use only the mathematical apparatus of probability theory and decision-making methods in vague conditions. The article presents the result of applying the methods of the theory of the importance of criteria in order to determine the most rational choice of crew members’ activity at various stages of flight and piloting modes of the latest generation aircraft.

Keywords: importance of criteria, evaluation of flight parameters, activity control, degree of aircraft automation.

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DOI 10.51955/2312-1327_2024_2_61

Pavel V. Pavlov

Daniil I. Tyurnev

Nikita V. Sukhachev

Abstract. Assessing the technical condition of glazing elements in the cockpits of operational-tactical aircraft still remains the most important task in ensuring flight safety. To increase the efficiency of operations for non-destructive testing of glazing elements using the speckle structure method of optical radiation, the authors propose to use neural network technologies to automatically identify controlled areas in the cockpit. Artificial intelligence technologies have been used to realise this task. They are based on algorithms of semantic segmentation, classification and detection of monitored areas according to the established markers on the cabin due to the application of convolutional neural network on YOLOv8. The application of machine vision technology have made it possible real-time measurement of the glazing exit from the termination when overpressure has been created inside the cabin. This reduces the time for technical condition assessment by at least 10 times. The use of machine vision technologies have made it possible to measure the value of the glazing outlet from the sealing in real time when creating excessive pressure inside the cabin and thereby reduce the time to assess the technical condition by at least 10 times. The authors have established the reason for the discrepancy between the results of using the speckle-structure method of optical radiation in determining the value of glazing yield from the termination and the “tape” method and developed recommendations to reduce measurement errors.

Keywords: non-destructive testing, optical-electronic systems, speckle, semantic segmentation, convolutional neural network, YOLO, glazing.

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DOI 10.51955/2312-1327_2024_2_51

Oleg A. Ratenko

Elizaveta V. Samojlenko

Yurij V. Petrov

Abstract. In modern economic conditions, one of the important tasks is to transfer as many structural elements of aircraft engines as possible to condition-based operation while maintaining a balance between the economic effect and the flight safety level. Such measures will significantly allow aircraft operators to reduce operating costs. One of the candidates for the transition to condition-based operation are turbine blades of gas turbine engines, made from heat-resistant nickel alloys. The microstructure of the heat-resistant nickel alloys is a γ-matrix with dispersed particles of the γ’-phase included into it, which are the elements that provide the high strength properties of nickel alloys. The microstructural changes that occur during the operation of gas turbine engines in turbine blades associated with an increase in the size and shape of the γ’-phase particles, as well as their volume fraction, lead to degradation of the mechanical properties of products. Taking into account these changes can be a tool that will allow one to carry out calculations aimed at assessing the technical condition of the blades of gas turbine engines during their operation.

Key words: gas turbine engine, turbine blade, heat-resistant nickel alloy, γ’-phase, alloy microstructure.

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DOI 10.51955/2312-1327_2024_2_36

Mihail A Bobrin

Abstract. This paper considers an integrated tolerance control system with failure monitoring and prediction subsystems for aircraft safety management system (ASMS), which is relevant nowadays. The paper deals with the operational component of hydraulic system (HS) tolerance zones. The internal measured parameter is pressure, so it was necessary to find an algorithm that reflects its dependence on operating conditions, its coefficient of kinematic viscosity of the fluid, its temperature, operating time, ambient temperature and flight stage. The operational component of the tolerance zone can be derived from the obtained expression for the pressure by substituting the boundary values of the parameters included in this dependence.

While polling the sensors of the automatic control system it is necessary each time to calculate the range of variation of the parameter for the given stage of flight and other conditions with the help of algorithms for calculating the tolerance zone obtained in the paper. Moreover, the control system has to process a large amount of information using artificial intelligence (AI) methods which allows the safety of aircraft flight (SAF) to be managed.

Keywords: aircraft health management system, aircraft flight safety management system, automatic control system of aircraft hydraulic systems, operational pressure-tolerant zone.

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