Категория: Aeronautics

Performance optimization of a pulse-type combustion chamber

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UDC 004.588 BBK 74.5

Safarbakov A. M., Hodackij S. A.

The article describes methodology of solving an optimization problem on choice of the main performances of a pulse-type combustion chamber.  The system elements were considered. The authors demonstrate how to choose the criterion which provides evaluation of performances of the system or its model to figure out “the best” model or a set of “the best” conditions for system operation. The choice of an optimization method was demonstrated and the results of solving the optimization problem are provided.

Keywords: optimization, mathematical model, criterion, limitations, algorithm.

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Hardware-software simulator for primary radar signals of the control radar

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UDC 621.396.96 BBK 32.842

Hmarskij P. A., Rodriguez D., Solovov A. I.

The article focuses on the principles of construction of the developed hardware-software simulator for primary radar signals of the control radar. The use of the proposed hardware simulator within a dispatching radar will significantly improve its competitiveness due to the possibility of realization of the modes of research and implementation of existing and future algorithms for radar information processing.

Keywords: control radar, hardware and software system, the generator of trajectories, noise shaper, designer of radar objects.

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Filtering of optical signals based on multi-layered structures

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UDC 621.372 BBK 39.56

Polyakov D. O.

The article discusses synthesis of optimal filters for random spatial signals based on multi-layer optical structures running in the corner filtering mode.

Key words: corner filtering; synthesis; optical structure.

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The gyro stabilization of the unmanned aircraft platform for aerial photography and video surveillance

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UDC 531.383 BBK 32.816я431(2Рос)

Popov V. M.

The article presents a control algorithm for the servo drives of the gyro stabilized platform for unmanned aircraft vehicle (PUAV) for aerial photography and surveillance on the basis of the data from the 3-axis accelerometer and gyroscope located on the body of the UAV. The implementation of the algorithm using the servo SG90 with a programmable Arduino UNO hardware platform is reviewed.

Keywords: unmanned aircraft vehicle, gyro stabilized platform, micromechanical accelerometer, micromechanical gyroscope.

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A rotor in the field of the daily rotation of the Earth

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UDC 629.7.036.3 BBK 22.21

Danilenko N. V.

The author considers peculiarities of interference of a gyro rotor (of a GTE and others) in the field of the daily rotation of the Earth taking into account the azimuth orientation of its axis of rotation in horizontal plane.  The azimuthal characteristic of gyro rotor rundown is given. The author points out the necessity to correct the controlled rotor rundown time at GTE shutdown on the ground.

Key words: gyro rotor, rotor rundown, the theory of spinning tops, the field of the daily rotation of the Earth, the azimuthal characteristic of rotor, air mass transport.

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Vortex conversion with varying height of an air intake above the underlying terrain

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UDC 525.7 BBK 9.15

Danilenko N. V., Kirenchev A. G.

The article considers the issue of vortex formation of local gravity flows generated by an anthropogenic outflow (GTE operation on the ground). The vortex classification is analyzed and experimental research ways are determined. The authors suggest conditions for experimental research of vortices influenced by Coriolis force, vortex pairs of air intake case / underlying terrain interference, and a circular vortex of gravity flow / ground interference. The composite design peculiarities of the test installation for researching the vortex range are described.

Key words: local gravity flow, air intake vortices, vortex classification, process of vortex formation, vortex conversion.

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Test diagnostics of the windings of electrical machines using the travelling-wave method

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UDC 629.7 BBK 39.56

Shejnikov A. A., Belegov A. N., Rozhok A. V.

The authors developed a diagnostic relation which, when applied in measurement data processing algorithms of  test diagnostic systems of the windings of aeronautic electrical machines, avoids the need to store statistic information about the operational parameters of fault-free and faulty windings thus promoting validity and simplification of the diagnostics technique.

Key words: windings of aeronautic electrical machines, test diagnostics, travelling-wave method.

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The mathematical model of aerometric devices errors on the basis of different information integration according to flight recorders

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UDC 629.7 BBK 39.56

Shomankov D. A. 

The mathematical model presented in the article is based on the integration of different flight information recorded by the means of objective control and can be used in the systems of optimized evaluation of high-speed flight parameters or technical control of aerometric measuring devices.

Keywords: integration, correlation function, generating filter, errors, optimized evaluation, control, technical condition

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Development of mathematical model of input action for the device support of the radiation source according to the movable radio finder

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UDC 621.396.96 BBK 32.842

Hmarskij P. A., Sushhinskij A. A.

The authors present the methodology of development of input action mathematical model  for the device support of the radiation source according to the movable radio finder.

Key words:  movable radio finder; accompanied only by angular coordinates; model of input action; model of specifying impact; random discrete maneuver; the Kalman filter.

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Extraction of run-up signals in systems of information communication in VDL-2 mode

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UDC 621.396.74 BBK 39.571.5

Mezhetov M. A., Turincev S. V.

Air-to-air and air-to-ground automated data exchange systems are increasingly common. Automated data exchange (ADE) in such systems is conducted in VHF band with the use of VDL-2 или VDL-4 modes. The design of ADE receivers implies a clock sync (CS) circuit in their composition which can be constructed differently. A run-up signal in such systems is extracted digitally.  One of the factors influencing the quality if received information in VDL-2 systems is selection of a technique of run-up signal regeneration.  

The article considers a technique of run-up signal regeneration with use of front reconstruction which is implemented in a hardware-software receiver developed by the authors. Research of CS regeneration principles will enable to conduct a comparative analysis of different techniques of extracting and forming a run-up signal and to apply the hardware-software receiver for further research.

Key words: VDL-2, clock sync systems, Gardner detector, scrambler, quadrature components, hardware-software receiver.

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