Категория: 2.9. Transport systems

To the question of exploitation of diesel locomotives UzTE16М3 on the track section Marokand — Navoi JSC “Uzbekiston temir yullari”

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UDC 629.42:629.4.054, 625.28 BBK 39.235

Ablyalimov O. S.

The article presents the results of studies of the analysis and justification of efficiency of use of the main (train) three-unit diesels UzTE16М3 on the hilly-mountain area of Marokand – Navoi of the Uzbek Railways in the movement of freight trains with stops and without them at thestations en route, siding lines and separate stations. The obtained parameter values of the main indicators of the transport operation of the tested locomotives UzТЕ16М3 will be quite helpful for engine driver-instructors and specialists of the shop operation of the locomotive depot Samarkand, Bukhara in estimating the traction properties of track sides of a path profile and effectiveness of the operational activities of the mentioned real railway part of the JSC “Uzbekiston Temir Yullari”.

Keywords: research, result, freight train, movement, locomotive, railroad, track section, operation, condition, direction, speed, rolling stock, analysis, hilly and mountainous, estimation, station, submit, average, track side, profile.

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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 influence of cylindrical site extent in the nozzle’s minimum section on discharge coefficient

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UDC 621.45.02+536.8+519.6 BBK 39.62

Sabirzyanov A. N., Kirillova A. N.

The article deals with the influence of cylindrical site extent in the jet nozzle’s minimum section on coefficient of discharge which was evaluated according to the geometrical characteristics with the modern methods of computing hydrodynamics. It shows the dependences of influence of extent on discharge coefficient for sound and supersonic nozzles at various taper angles. It gives idiosyncrasies of influence of a rounding off upon the transition to the cylindrical site.

Keywords: jet nozzle, discharge coefficient, gas dynamics, modeling.

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Increase of efficiency of airdrome traffic control on the base of receiving the differential corrections by mobile aerodrome vehicles

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UDC 621.396.74 BBK 39.571.5

Mezhetov M. A., Turincev S. V., Serebrennikov E. A., Nikitich P. V.

The authors consider the issue of increase of accuracy of satellite positioning of mobile objects within the aerodrome by receiving data from the local augmentation station. The use of a signal of VDL-2 mode with 8-position differentially encoded phase-shift keying can solve the problem. Using the HIL-simulation the diagrams of forming and receiving a signal of VDL-2 mode are synthesized.

Key words: GNSS augmentation system, VDL-2, differentially encoded phase-shift keying (D8PSK), raised cosine filter, tribit, quadrature components.

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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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A study of the accuracy of the definition of coordinates of air targets in satellite-pseudolite multipositional surveillance system

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UDC 621.396.98 BBK 32.95

Kiryushkin V. V., D’yakonov E. A.

The article describes the study of the accuracy of determination of coordinates of air targets in multipositional surveillance system using the signals of navigation satellites of global navigation satellite systems and pseudolite signals to illuminate air targets. It is shown that the use of pseudolite signals allows to reduce the peak error 8-10 times and decrease the average error of measurement of coordinates of air targets 2-3 times in a multipositional satellite surveillance system.

Key words: global navigation satellite system, multipositional surveillance system, the error of measurement of coordinates, operating zone.

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