bluuebunny/crossref_metadata_2025 huggingface dataset:
Acciones de prevención en acoso escolar utilizadas por docentes de Educación Secundaria Obligatoria
Authors: Pérez Carbonell Amparo , Ramos Santana Genoveva , Serrano Sobrino Macarena
Published: May 2017

El objetivo de este artículo es presentar la revisión de distintas investigaciones que permiten conocer las acciones de prevención primaria, secundaria y terciaria que los docentes de Educación Secundaria Obligatoria (ESO) realizan ante el acoso escolar o bullying. Actualmente los distintos agentes educativos y sociales muestran una gran preocupación por las crecientes denuncias del alumnado de esta etapa educativa. A tal fin, se realiza un proceso sistemático de indagación documental en distintas bases de datos sobre estudios, en el contexto educativo español, realizados en torno a esta temática. Se concluye, por un lado, que el profesorado encuestado, conoce y desarrolla más acciones de prevención primaria y secundaria sobre el acoso escolar que de prevención terciaria. Que las acciones primarias y secundarias tienen un enfoque más educativo que punitivo o sancionador y buscan principalmente la generación de un clima adecuado de convivencia tanto en el centro como en el grupo-clase. Por otro lado, en el nivel de prevención terciaria, desarrollan acciones centradas en hablar con el alumnado, aplicar las normas de disciplina y convivencia y derivar los casos a los departamentos de orientación de sus centros.
Analysis of the results of fatigue tests of cylindrical specimens with fillets using the method of finite element modeling
Authors: Vakulyuk V. S.
Published: May 2017

The results of fatigue tests of cylindrical specimens with fillets of different radii to determine their fatigue limit under bending are analyzed using the method of finite element modeling. The peculiarities of surface hardening technological process have been taken into account.
Active noise control systems based on acoustic particle velocity measurements
Authors: Gasparov M. S. , Kharitonov M. Yu.
Published: May 2017

The paper describes a system of active noise suppression based on a one-meter long air duct with the section of 1010 cm with built-in speakers imitating noise and anti-noise. The system of automatic noise suppression generates anti-noise in accordance with the signals from two acoustic sensors. The efficiency of suppressing acoustic feedback is analyzed. An active noise suppression system based on FPGA (field programmable gate array) was built. A microelectromechanical Microflown sensor directly measuring particle velocity is used as the reference signal sensor.
Mathematical model of training and self-training in maintenance of complicated systems
Authors: Koptev A. N. , Popovich A. A.
Published: May 2017

The paper presents theoretical analysis of various models of self-training using a uniform formal system of concepts. Models based on concepts of reinforcement of communications and a choice from a set of hypotheses are described as well as models of automatic and perceptron types. A number of parameters describing the process of self-training is derived.
Test rig for a hydraulic drive under switched inertance control
Authors: Shorin V. P. , Sverbilov V. Y. , Gimadiev A. G. , Greshniakov P. I. , Ilyukhin V. N. , Stadnik D. M.
Published: May 2017

The paper presents a test rig equipped with control, measuring and registration hardware for the examination of dynamics and power efficiency of a hydraulic drive with a digital flow controller as one of the most promising means of control. The results of experimental research of a hydraulic drive under digital control in the form of a switched inertance device are presented.
Cyclic com pression of a multilayer multispan laminated package of corrugated sheets
Authors: Eskin I. D. , Alkeev R. I. , Ivashchenko V. I.
Published: May 2017

The task on cyclic compression of a multilayer multispan package of corrugated sheets is solved by the Bubnov-Galerkin method taking into account the rotation of the package sections located at the vertices of corrugations. The relations describing any loading processes in the field of elastic - hysteresis loops of the package are obtained.
Experimental and design analysis of models of cyclic compression for a multilayer multispan package of corrugated sheets
Authors: Eskin I. D. , Alkeev R. I. , Ivashchenko V. I.
Published: May 2017

The paper presents a solution of the task on cyclic compression of a laminated corrugated multispan packet assuming no rotation of the sections located at the vertices of corrugations (simplified model). Relationships describing any loading process in the field of elastic-hysteresis loops of the package are obtained. The relationships are experimentally analyzed in the range exceeding that of corrugated package parameters applied in practice.
Calculation of spatial distribution of energy of a complex radiator
Authors: Yevdokimov I. Ye. , Nikolaenko V. S. , Filippov G. S. , Yashchenko B. Yu.
Published: May 2017

The paper presents the results of calculating spatial distribution of radiant energy from a radiator consisting of a cylindrical source of radiation and two disk reflectors, accordingly, with a diffuse character of radiation and reflection. A program of modeling optical parameters of complex reflectors is used as the basic tool of calculation. The basis for the procedure applied is the iterative-zonal method the essence of which consists in separating the radiating and reflecting systems as well as the light-trapping hemisphere into mentary platforms. The exchange of energy between the platforms is defined by means of a forward stroke beam method. The results of calculation are compared to the experimental data obtained in the course of the model light experiment.
Conical horn antenna on a metal screen with a bias gyromagnetic resonator for the measurement of characteristics of an electromagnetic microwave concentrator
Authors: Soldatov A. A. , Plotnikov A. M. , Salimova N. R. , Salimov Sh. R.
Published: May 2017

The paper describes an antenna based on a conical horn and magnetized gyromagnetic resonator (GR) on a metal screen which is used to measure electrical characteristics of an electromagnetic microwave concentrator. The antenna under study has improved characteristics as compared with a similar structure without a GR: significantly higher gain at low weight and overall dimensions, circular polarization field radiation with high selectivity, electrical switching of the field rotation direction and virtually inertia-free electrical tuning of radiation frequency.
Economic-mathematical model of forming the capacity of an enterprise
Authors: Borodin A. I. , Goloshchapova L. V.
Published: May 2017

The article is devoted to the development of mathematical models of the formation and analysis of the economic potential in terms of rational (optimum) organization of the proper business entitys economic activities.
Struggle of the deputies of the first State Duma for the expansion of the legislative powers and for the elimination of the state council (april-june 1906)
Authors: Minyashev V. S.
Published: May 2017

The paper is devoted to the struggle of the 1st convocation deputies of the State Duma of the Russian Empire for the expansion of legislative powers and for the elimination of the upper house the State Council. The attitudes of various parties and periodicals and the opinion of leading Russian lawyers of the beginning of the XX century on the matter are presented. Peasants mandates to the deputies concerning the demand for the sovereign State Duma are analyzed. The attitude of certain deputy groups concerning the expansion of legislative powers of the Duma is presented. Two stages of struggle for the expansion of legislative powers and elimination of the State Council are discussed.
Improvements in methods of analysis and control of space-rocket equipment reliability at the stage of complex electrical testing
Authors: Belova V. V.
Published: May 2017

The paper presents the structure of a logical-mathematical model for the control and analysis of the reliability of a complex engineering system of a full-scale item of equipment with ground experimental development at the stage of complex electrical tests for the integration in the process of testing Relex software.
Determination of aircraft part masses based on a parametric 3D model at the stage of technical proposals
Authors: Borgest N. M. , Gromov A. A. , Tarabaeva A. I.
Published: May 2017

The paper presents a computer model of masses of the basic aircraft units at the stage of technical proposals in a 3D CAD system CATIA .Comparative analysis of the models of aircraft part masses is carried out. An algorithm of automatic aircraft plane balance is proposed on the basis of the 3D model developed.
Determination of optimum plans of Earth Remote Sensing spacecraft detailed survey by the use of a graph
Authors: Buzuev K. V.
Published: May 2017

The paper deals with planning the observation of a set of routes lying in the swath of an Earth Remote Sensing (ERS) spacecraft. An algorithm of planning a detailed survey of the set of routes is proposed which makes up a complex of possible plans of the routes detailed survey in the form of a graph. A description of the detailed survey plans graph is given and the conditions for the existence of graph nodes and edges are specified. Several criteria of optimality are proposed to provide the choice of the optimum detailed survey plan. Optimum detailed survey plans based on the simulation data for a set of six routes are chosen in accordance with each proposed criterion.
Unit impulse input tests of a system of the «Frigate» upper-stage rocket
Authors: Mikhalenkov N. A. , Yermakov V. Y. , Utkina Y. I.
Published: May 2017

The paper is devoted to impact tests of a system of the Frigate upper-stage rocket, various methods of influence on the test object being used. A procedure is proposed for testing the system of separating the upper stage from the I block that makes it possible to reduce the number of loadings of the object.
Peculiarities of acoustic loading of the space vehicle in the nose fairing launched as part of a «Soyuz»-type rocket
Authors: Popov P. A. , Sindyukov A. A. , Kryuchkov A. N.
Published: May 2017

The paper describes a method for finding resonant acoustic modes taking into account the influence of the spacecraft geometry and that of the nose fairing of the "Soyuz" rocket. An example of determining the resonant acoustic modes under the nose fairing is given. A method of determining the effects of spacecraft component density under the payload fairing on the acoustic loading is described. The analysis of acoustical characteristics of the nose fairing compartment is carried out taking into account the influence of cutouts of sound insulation elements. Recommendations on the reduction of acoustic loads on the upper surface of the spacecraft are given.
The main trends of aviation science development
Authors: Alyoshin B. S. , Chernyshev S. L.
Published: May 2017

The paper is devoted to the promising civil directions in the field of aerodynamics, aircraft configurations, power plants, materials and structures. The goals facing the aviation science with respect to improving aircraft are dealt with. Projects which are conducted by TsAGI in these directions are described. The paper is based on the materials of the plenary session of the Symposium Aircraft building in Russia. Problems and Prospects devoted to the 70th anniversary of Samara State Aerospace University named after academician S. P. Korolyov.
Integrated assessment of the efficiency of an orbital inspection space system based on small satellites
Authors: Tkachenko I. S. , Kaurov I. V.
Published: May 2017

The paper presents a method of integrated assessment of the efficiency of an orbital inspection space system based on small satellites with electrojet power modules. The main indicators of the systems efficiency are defined. An algorithm for calculating the coefficient of integrated relative assessment of an orbital inspection system is developed. The approbation of the developed algorithm was carried out in order to define the most efficient variant of creating the system with the given priority coefficients. The results of assessing the systems efficiency are shown to depend strongly on the values of the coefficients of priority of the indicators.
Increasing the overall performance of a two-stroke engine with spark ignition by fuel injection
Authors: Dovgyallo A. I. , Krasheninnikov S. V. , Shchepetov D A.
Published: May 2017

The paper deals with the problems of organizing the process of gas mixing in two-stroke internal combustion engines with spark ignition and crankcase scavenging. Fuel injection into the intake manifold is chosen as the most effective way of mixing from the point of view of the authors. The increase of overall performance of a two-stroke internal combustion engine is estimated. The principle of operation of the system and the experimental installation are described.
Peculiarities of heat transfer in thermoacoustic converters
Authors: Dovgyallo A. I. , Nekrasova S. O.
Published: May 2017

The problems of heat transfer in thermoacoustic converters are discussed in the framework of analysis of studies of heat exchangers of thermoacoustic converters with a view of summarizing the concepts of physical processes of heat transfer in parameters of the theory of heat transfer, fluid dynamics and wave theory.
Evaluation of internal combustion engine cycle work using an ionic current sensor
Authors: Ivashin P. V. , Ramazanov M. P. , Tverdokhlebov A. Ya. , Shaikin A. P. , Yasnikov I. S.
Published: May 2017

The interrelation between the electrical conductivity of flame and the internal combustion engine cycle work is found experimentally with the aid of an ionic current sensor installed in a spark ignition internal combustion engine combustion chamber. It is shown that only one ionization cycle is needed for the analysis of combustion process parameters in a spark ignition internal combustion engine.
Adhesion strength of heat-insulating and wear-resistant ceramic coatings on aluminum alloys
Authors: Krishtal M. M. , Ivashin P. V. , Polunin A. V. , Pavlov D. A. , Nikerov K. N.
Published: May 2017

The paper presents a review of research devoted to the determination of adhesion strength and tendency to cleavage of a wear-resistant heat-insulating layer on aluminum-silicon alloys strengthened by the microarc oxidation method. The possibility of using the microarc oxidation technology for the strengthening of parts made of aluminum-silicon alloys operating under high-temperature conditions and significant thermal deformations in power plant engineering.
Automated generation of structural members of a spacecraft thermal model
Authors: Kulikov D. S. , Shatin A. A. , Velmisov I. G.
Published: May 2017

The paper presents software for the calculation of temperature conditions of spacecraft, its advantages and disadvantages are discussed. The main idea is using combined software for the generation of structural members of a spacecraft thermal model taking into account the labor input of constructing such a model.
Defects of shrouded blade platforms of high-temperature gas turbines
Authors: Belousov A. I. , Nazdrachyov S. V.
Published: May 2017

The article describes the defects of airfoil shroud platforms of the high pressure turbine of an NK-36ST engine for ground application and shows corrective actions for defect elimination. The structure of a light airfoil shroud platform that can increase the blade lifetime is introduced.
Influence of energy separation and vortex tube geometry on the flow turbulence
Authors: Piralishvili Sh. A.
Published: May 2017

The paper outlines the interconnection between the characteristics of energy separation and the turbulence of the vortex flow based on the geometrical characteristics of the vortex tube (such as length, diameter, etc.). The calculated data are compared with the experimental results.
Method of calculating GTE gas-thermodynamic parameters with blade row description of an axial multistage compressor
Authors: Boyko L. G. , Karpenko E. L. , Akhtemenko U. F.
Published: May 2017

A method of calculating the operating performance of a turboshaft gas turbine engine for steady- state conditions has been developed based on a mathematical model with a row- after- row presentation of a multistage axial compressor. This method as opposed to the existing ones makes it possible to determine gas turbine engine gas-thermodynamic parameters at different ratings taking into account such factors as air bleeding and blow off directly from the air-gas channel, the variation of geometrical parameters of compressor blade rows and meridian bypasses and changes in the programme of regulating variable stator vanes. The results of investigating the thermodynamic parameters of the main units, their elements and performance characteristics of a turboshaft gas turbine engine are presented for a wide range of rotor speeds (throttle performance). Comparisons between the computational results and the experimental data are made, their agreement is shown to be satisfactory.
Analysis of stress distribution in the dangerous section area of specimens with fillets under bending using the finite-element modeling method
Authors: Vakuljuk V. S.
Published: May 2017

The results of testing specimens with the diameter of 12 mm made of steel 20 with fillets of various radii (0,5 mm, 1 mm, 3 mm and 5 mm) both non-hardened and hardened by peening have been analyzed by the finite- element modeling method. It is experimentally established that the fillet radius increase results in the dangerous section moving to the specimen smallest section and reaching it at the extreme. This fact is confirmed by thecalculation method. The dependences of the stress concentration coefficient in the dangerous section area of cylindrical specimens with fillets of various radii under bending regularities have been obtained out by the finite- element modeling method.
Development of pneumatic- type starting nozzles for a full-scale low emission combustion chamber
Authors: Vasilyev A. J. , Blumkin P. I. , Chelebyan O. G.
Published: May 2017

To provide stable operation and confident firing up in the main combustion chamber of a gas turbine engine under high-altitude flight conditions a new scheme of a pneumatic- type starting nozzle is developed. The firing tests carried out in a full-scale low-emission combustion chamber showed their principal fitness for work. The results of the experimental study of two versions of starting nozzles for the purpose of determining comparative starting and stalling characteristics at different heights are presented in the paper.
Peculiarities of application of biofuel mixture in combustion chambers of modern gas turbine engines
Authors: Vasilyev A. J. , Medvedev R. S. , Chelebyan O. G.
Published: May 2017

An experimental study of combustion processes occurring during the combustion of both standard aviation fuel and alternative fuels (biofuels) is carried out. The range of steady-state combustion in the compartment of a chamber working on fossil fuel as well as on biofuel and ethanol is investigated. As a result, the scheme has shown its combustion efficiency, and the results have provided the necessary conditions for the solution of practical engineering problems.
Aerodynamic improvement of GTE compressors by space profiling of blade vanes
Authors: Gerasimenko V. P. , Shelkovsky M. Y.
Published: May 2017

The optimum spatial profiling of blade vanes of GTE compressor stages is considered on the basis of calculation of a three-dimensional viscid stream. The simultaneous varying of geometrical parameters of blades and blade cascades in their profiling substantially accelerates the procedure of parametric optimization. As an integral criterion of minimization of different types of hydraulic losses the efficiency of compressor stages is used. The coefficient of hydraulic resistance is shown to decrease as compared to the initial vane, in a wide range of incidence angles, as a result of experimental research of the optimized output straight vane cascade of a stationary GTE compressor.
Quasi one-dimensional model and calculation of processes in gas turbineengine combustion chambers given the heterogeneity of the combustible mixture, changes in mass, composition, temperature and stirring efficiency of the working body
Authors: Didenko A. A. , Sokolov A. B.
Published: May 2017

The methodology of one- dimensional calculation of the combustion chamber existing at SSAU has been significantly complemented: a) the uneven distribution of fuel in the combustion zone and its combustion in the range of excess air ratio 0.55 ... 1.65 has been taken into account; b) the amount of vaporized fuel at each site is determined by considering the size of evaporating droplets; c) for each fraction of the fuel burnt the equilibrium composition and the adiabatic equilibrium flame temperature is determined; d) a scheme of mixing the combustion products with the secondary combustion air and mixing air is proposed in order to evaluate the non-uniformity of the temperature of exhaust gas at the output of the combustor; e) a mixing quality factor is introduced. The impact of the completeness of mixing, composition and temperature of the gas on the quantity of nitrogen oxides along the length of the flame tube, the NO emission index and the non-uniformity of the temperature field in the output section is assessed. The updated method of calculation is illustrated by the low- emission aviation turbine engine combustor.
Determination of the maximum values of the spatial angle of attack of a nanosatellite in motion on lowcircular orbits
Authors: Glukhova L. V. , Timbai I. A.
Published: May 2017

Spatial motion of an uncontrolled nanosatellite around its center of mass on low circular orbits is considered. The aerodynamic characteristics of nanosatellites CubeSat-2U and CubeSat-3U are determined. The distribution functions of the maximum angle of attack of nanosatellites for various flight altitudes depending on the dispersion of the components of the initial angular velocity are obtained.
Software and algorithmic support for the ground-based complex for small spacecraft attitude determination
Authors: Grigoryeva M. Y. , Kramlikh A. V.
Published: May 2017

The paper is devoted to problems of constructing software and algorithmic support for a ground-based complex for determining the attitude of small satellites. The kinematic attitude determination algorithms based on the integration of diverse information form the software basis.
Developing methods for electrical tests of onboard devices incorporated in spacecraft
Authors: Karasev A. A. , Chuprinskiy I. I.
Published: May 2017

The paper deals with the development of methods of testing onboard equipment incorporated in automatic spacecraft. Considerable difference in methods of assessing the technical state of the object under investigation in normal operation during the tests is shown. A way of testing using the pattern for the modification of onboard equipment control programmes with the aim of increasing its controllability is discussed.
On-stand emergency protection and control system for propulsion tests of «Soyuz-2-1B» launch vehicle
Authors: Liseykin V. A. , Tozhokin I. A.
Published: May 2017

The paper presents some issues related to on-stand emergency protection and control systems developed by the center (FKP NITs RKP) in support of propulsion tests of the new Russian Soyuz-2-1в launch vehicle.
Improvement of the quality of the surfaces of monowheel blades of liquid rocket engine turbopump assemblies
Authors: Mozgov S. A. , Panov D. V. , Saushkin B. P.
Published: May 2017

Considered the problem of poor quality of blade surfaces monowheels after the electroerosion. The recommendations on selection of electrolyte composition and parameters of the treatment regime. Proposed the use of special equipment to implement the process of electrochemical surface treatment of blades monowheels.
Spacecraft preset orbital parameters control by means of thrusters
Authors: Salmin V. V. , Volotsuev V. V. , Shikhanov S. V.
Published: May 2017

To clause the problem of a choice of design characteristics low-orbit space vehicle, incorporating Electric Rocket Propulsion System (ERPS) for correction of parameters of an orbit is considered. The mathematical models describing interrelation of factors of an environment, design parameters of onboard systems (including ERPS) and design characteristics low-orbit space vehicle as a whole are considered.
Detector of micrometeoroids and space debris for the small spacecraft AIST-2
Authors: Telegin A. M. , Syomkin N. D.
Published: May 2017

The paper presents a design of a sensor for studying micrometeoroids and space debris.
Module of storing information: combining the functions of authorizing access and transfer of information within the control system equipment
Authors: Hanevsky D. A. , Solovieva N. V. , Ananyin A. S. , Shchepochkin I. N.
Published: May 2017

The paper presents a module of information storage, designed for universal, not connected with a particular order, realization of the functions of authorizing access, storage and transfer of information within the equipment of a control system.
Increasing the lifetime of power gyroscopes and momentum wheels
Authors: Khrutskaya M. V. , Kamaldinov A M.
Published: May 2017

The article discusses technological capabilities of increasing the lifetime of power gyroscopes and momentum wheels due to the improvements in the technology of assembling them. It is shown that the axial preload on the main bearings of power gyroscopes and momentum wheels has a considerable influence on their lifetime. It is necessary to control the magnitude of the axial preload in conditions close to operating ones.
Simulation modeling as a method of assessing the resource intensity of space rocket complex support equipment operation
Authors: Shcherbina I. S.
Published: May 2017

Simulation by software models is one of the most frequently used techniques for the analysis of complex engineering and organizational systems. The paper presents the analysis of capabilities of analytical and simulation models when analyzing the functioning of complex engineering and organizational systems. The resource intensity of operation is assessed with the help of the proposed simulation models of the system of operating the support equipment of medium capacity boosters launch facilities taking into account the application of various methods of controlling the technical condition of the equipment and the influence of degradation processes on the equipment reliability. The dependences of the availability factor and maintenance costs on the time in service have been obtained for the launch systems that make it possible to assess the advantages and disadvantages of the control strategies taking into account long periods of launch facilities operation.
Multilevel system of Earth operational hyperspectral monitoring
Authors: Anshakov G. P. , Egorov A. S. , Raschupkin A. V. , Skirmunt V. K.
Published: May 2017

The paper presents an innovative project of Samara Aerospace Cluster Multilevel system of Earth operational hyperspectral monitoring the goals and tasks of the project are outlined.
The effectiveness of using multispectral and hyperspectral remote sensing data for environmental monitoring
Authors: Anshakov G. P. , Zhuravel Y. N. , Fedoseev A. A.
Published: May 2017

Aspects of Earth remote sensing data processing for the detection and identification of natural and anthropogenic objects are examined in the paper. The results of research carried out on multi- and hyperspectral images of Samara region obtained from EO-1 and Landsat-8 spacecraft are presented.
Modelling of solving problems of Samara region ‘s water bodies bathymetry by means of Earth remote sensing
Authors: Anshakov G. P. , Malinovskii V. A. , Sinelnikova E. A. , Skirmunt V. K.
Published: May 2017

Methods of solving the problems of depth sounding of small rivers and ponds by means of Earth remote sensing are discussed in the paper. The results of the experimental work carried out are presented.
Analysis of landing process dynamics for different reentry vehicle landing device support schemes
Authors: Borzykh S. V. , Voronin V. V. , Shchiblev Y. N.
Published: May 2017

The paper presents a mathematical model of dynamics of the process of the reentry vehicle landing on the landing surface aimed at investigating the stability of motion and the landing device efficiency. The mechanical system, including the vehicle body and the landing device elements is a structure of absolutely rigid bodies with internal connections. A comparative analysis of the landing process is carried out for the optimal choice of the landing device configuration.
Single-coil eddy-current transducers for measuring mechanical parameters
Authors: Borovik S. Yu. , Sekisov Yu. N.
Published: May 2017

Eddy-current transducers with single-coil sensitive elements are discussed in the paper. Embodiment modifications are presented and examples of using the transducers for measuring mechanical parameters are demonstrated.
Numerical investigation of gas dynamics in nozzles of small-dimensioned gas generators and flowing out jets
Authors: Ivanov I. , Kryukov I. , Shustov S.
Published: May 2017

The paper presents the statement of the problem of numerical simulation of gas dynamics of nozzles and jets of small-dimensioned gas generators of supersonic flows based on boundary layer and Navier-Stokes equations and the results of solving it. The results of the numerical studies of gas dynamics of nozzles and jets for standard small-dimensioned gas generators with a thrust 6 N and 12 N are given. Significant potential of increasing specific impulse by optimizing the contour of supersonic nozzles of small-dimensioned gas generators are exhibited. The process of shock wave formation in the supersonic part of the nozzle of a standard smalldimensioned gas generator is numerically investigated. Significant impact of shock waves on the gas dynamics of vacuum jets is illustrated.
Computer simulation of forming thin-walled t-tees
Authors: Popov I. P. , Severinenko A. Yu. , Petrof Yu. O.
Published: May 2017

The paper presents a new method of forming thin-walled t-tees. A finite- element software product ANSYS/LS-DYNA is applied to analyze the quality of the t-tees produced and to compare them with those obtained by flanging. The variation in thickness of t-tees is analyzed and the efficiency of the forming method proposed is confirmed.
Implementation of hardware-software filtering in a measuring converter of the arterial pulse signal
Authors: Fedotov A. A. , Akulov S. A.
Published: May 2017

The paper deals with a technique of hardware-software filtering implemented in a measuring converter of the arterial pulse signal. As a result of research the optimal pass band of a digital filter and optimal cut-off frequency of a hardware high-pass filter were determined. The metrological characteristics of a photometric measuring converter of the arterial pulse signal were investigated. The instrumental errors of measurement of amplitude-time characteristics of the recorded arterial pulse signal were determined.
Comparative modelling of laser beam propagation in a uniaxial crystal based on integral operators
Authors: Krasnov A. P. , Khonina S. N.
Published: May 2017

A comparative numerical calculation of propagation of Gauss-Laguerre and Bessel laser modes in an isotropic medium and in a uniaxial crystal by means of integral propagation operators based on the plane and spherical wave expansion is presented.Numerical simulations with different types of beam polarization and different position of the crystal axis has made it possible to determine the conditions under which the greatest astigmatic distortion of the beams takes place. The analysis may be useful in practice to determine the position of the crystal axis.
Design of robust systems for the stabilization of unmanned aircraft equipment
Authors: Sushchenko O. A. , Azarskov V. N.
Published: May 2017

A model of a triaxial system for the stabilization and control of sight axis orientation of observation devices operated at unmanned aircraft is developed. The features of the robust structural synthesis procedure as applied to a system of the type analyzed are discussed. The results of the simulation of a synthesized system are presented.
Post-operation state and extension of service life of compressor blades of the gas-turbine power plant GTE-45-3
Authors: Tarasenko Y. P. , Berdnik O. B. , Tsareva I. N.
Published: May 2017

Gas turbine engine compressor blades are the most essential parts among all the units of gas turbine power plants. They are made of chromium stainless steels. Erosive and corrosive wear of working surfaces as well as thermal stress fatigue are the main types of damage of compressor blades after long-term use. The aim of this work was to develop methods of recovering the serviceability of the material of the power plant ГТЭ-45-3 compressor blades with a view to extending their service life. To examine the post-operation state of compressor blades and the material serviceability the compressor blades of the gas turbine engine power plant ГТЭ-45-3 made of corrosion-resistant steels ЭИ961 (13Х11Н2В2МФ) and 12Х13 were investigated after their service life expired with the total engine hours equal to 50000. To evaluate the serviceability of the blade material an unconventional approach and know-how were used. The results of analysis of the microstructure of corrosion-resistant steels as well as their physical and mechanical properties are presented in the paper. A process of material serviceability recovery is developed with a view to extending the service life of compressor blades. The process includes the following sequence of operations: machining aimed at removing corrosion and mechanical defects, argon-arc welding that restores the geometry of the rotor blades, thermal tempering for removing residual stress.
Structural and acoustic anisotropy of turbocompressor blade material
Authors: Tarasenko Y. P. , Krivina L. A. , Motova E. A. , Nikitina N. Ye.
Published: May 2017

The investigation is concerned with working compressor blades of the sixth and eighth stages of the turbo-compressor rotor of the ДЖ59Л engine made of stainless ЭИ961 (13Х12Н2В2МФ) heat-resistant steel in a post-operation state and the same blades after tempering. The objects of research are the parameter of intrinsic acoustic anisotropy and the structural anisotropy factor of the carbide phase of material of turbo-compressor blades in post-operation state and subsequent tempering. The aim of the study is to show that the ultrasonic echo technique holds promise as a method of nondestructive control of the material structure directly on the product both at the stage of output control in the production and repair of blades, and in the post-operation state. The analysis of the blade material structure is carried out using the methods of optical metallography with the use of the GoodGrains software and ultrasonic echo technique of nondestructive control. Using the method of optical metallography it was established that a carbide phase of acicular shape is present in the material of blade airfoil with a high degree of anisotropy, which indicates the degradation of microstructure in the post-operation state. Positive influence of tempering on the uniformity of carbide phase distribution in the material of rotor blades is noted. Correlation between the parameter of acoustic anisotropy and the metallographic anisotropy factor of inclusions of a carbide phase in the blade material is revealed. The echo technique of nondestructive control of structure shows great promise for application at any stage of output control directly on a product.
Heat-shielding zirconium dioxide coating on an intermetallic substrate obtained by the method of high-energy plasma spraying for gas-turbine engine turbine blades
Authors: Tarasenko Y. P. , Tsareva I. N. , Berdnik O. B. , Fel Ya. A. , Fedorchenko D. G.
Published: May 2017

The paper discusses the task of protecting the working surface of turbine blade made of heat-resistant nickel alloys against high-temperature gas corrosion and high temperature gradient. Improvement of the performance characteristics of a heat-shielding coating is achieved by increasing the energy characteristics of the plasma spraying process (temperature of the plasma flow, mass-average velocity of the plasma jet) with the help of up-to-date ЖС6Ф equipment using a ПНК-50 plasma torch. Special attention is given to the study of high-temperature stability of the alloy as the process of high-energy plasma spraying is associated with the heating of the substrate. The patterns of forming the phase composition and microstructure of the zirconium dioxide coating formed on the intermetallic substrate of the Ni-Co-Cr-Al-Y system, sprayed using the ПНК20Х20Ю13 powder mixture with particles of various dispersion are analyzed. The results of research of the structures, physical and mechanical properties as well as the efficiency of a zirconium dioxide heat-shielding coating, formed by high-energy plasma spraying and designed to provide thermal protection of turbine blades of gas turbine engines are presented. The results of the investigation showed that the coatings developed are designed to protect various-application gas turbine blades against the starting load high-temperature gradient, gas corrosion and erosive wear.
Parametric instability of the dynamics of gear wheels
Authors: Kurushin M. I. , Balyakin V. B. , Kurushin S. A.
Published: May 2017

Analytical research was carried out with the aim of finding the cause of dynamic processes of vibrationexcitation of gear wheels. This paper presents an elastic model of gearing without regard for compliance of supports.It is shown that parametric oscillations are caused by a periodic change of mesh force gearing in passingfrom one tooth mesh to double pair meshing and vice versa. The dynamics of an elastic system can be controlledby using the contact ratio e in the gear mesh which does not depend on the transmitted power. The size of instabilityzones depends both on the gear wheel rotation frequency and on the degree of overlap in teeth mesh.There are several zones of instability and stable operation of elastic systems at all gear wheel rotation frequenciesexcept those equal to doubled first frequencies. All zones of instability and resonances are located in thezones of phase vibration changes, with maximum efforts taking place in the areas of one tooth mesh before passingthe zone of instability or resonance, while after passing these zones the maximum mesh force, on the contrary,will take place in the areas of double pair meshing.
Dependence of the endurance limit on the character of residual stresses distribution in the surface layer of hardened parts
Authors: Kirpichyov V. A. , Vakulyuk V. S. , Bukaty A. S. , Lunin V. V. , Mikhalkina S. A.
Published: May 2017

The influence of the character of compressive residual stress distribution on the endurance limit of surfacehardened specimens made of various steels and alloys under bending has been examined. Specimens madeof ВНС40 and 38Х2МЮА steels with V-shaped notches were hardened by nitriding, foundation specimensmade of ВКС-5 alloy by cementation and ionic cementation, flat specimens made of ЭИ698ВД alloy by airshot-blasting. The influence of surface hardening on the endurance limit was assessed using two criterions,namely: residual stresses on the dangerous section surface and the average integral residual stresses. It was establishedthat the endurance limit of surface-hardened specimens (parts) is determined not by the value of compressiveresidual stresses on the surface but by the completeness of the diagram of the residual stress over the partsurface layer thickness on condition that the surface layer thickness is equal to the critical depth of the nonpropagatingfatigue crack. The average integral residual stress criterion calculated over the thickness of a surfacelayer of the dangerous section equal to the critical depth of the non-propagating fatigue crack gives a rather accurateestimation of the influence the character of compressive residual stress distribution has on the endurancelimit of hardened specimens (parts). In practice the estimation of the increment of surface- hardened specimens(parts) endurance limit by the criterion of residual stresses on the dangerous section surface may lead to a significanterror.
Cycle parameters of an internal combustion spark-ignition gas piston engine with an electronic control system
Authors: Shishkov V. A.
Published: May 2017

The purpose of the work is to develop methods of managing the cycle of bifuel and single-fuel vehicleswith engines running both on petrol and gas fuel as well as physically and mathematically reasonable algorithmsfor an electronic control system. On the basis of full-scale tests of an internal combustion spark-ignition pistonengine and a technique developed for designing an ejeсtor with non-stationary physical parameters of workingbodies a method of compensating power losses by ejecting a portion of air with the help of pressure differenceon the valve of a gas electromagnetic injector is proposed. On the basis of the theoretical analysis and experimentaldata an algorithm of determining the fuel injection rate taking into account the subcritical or critical fueldischarge from the injector nozzle, the change in the speed of sound, the gas fuel pressure undershoot in the processof fuel feeding and the power supply voltage on the electromagnetic coil of the gas injector is developed. Amethod of determining the ignition advance angle when switching from petrol to gas fuel is developed for anelectronic control system of an internal combustion spark-ignition engine which serves as the basis for calculatingthe adjusting factors for liquefied petroleum gas and compressed natural gas.
The study of shrouded fan vibration modes and frequencies on holograph and as a part of the engine on the test rig
Authors: Koskin A. O. , Seleznev V. G.
Published: May 2017

The article reports about application results of holographic interferometry method for the analysis ofrotating fan vibration modes. So far there are no practically the experimental works explaining behavior ofturbomachinery bladed discs as a part of the engine, on the basis of knowledge about modes and frequencies ofobservable disc in the absence of rotation. Having initially bladed disc amplitude-frequency characteristics in theform of vibration modes pictures with the corresponding frequencies, and then strain-gauging data for this diskbeing a part of the engine, makes it possible to carry out the vibration modes analysis of rotating disk. Vibrationmodes, received on holographic installation, are identified with vibration modes of a rotating disc on coincidenceof their frequencies.Vibration frequencies and modes of a fan first stage, received on holograph, and thefrequencies, received using spectral analysis method for strain-gauging data, are given in the article. Closevalues of these frequencies allowed to connect vibration modes with rotating disc frequencies. Moreover, there isthe example of turbine rotor disc research, illustrated the importance of knowledge of turbomachinery discsvibration modes, in the article. The study revealed the existence of "horizontal" connection for some vibrationmodes, when two different vibration modes accord with almost the same frequency. On the basis of the carriedoutstudy it is possible to draw a conclusion that before installation of the bladed disc in the engine it isnecessary to define natural frequencies and vibration modes of this disc using modern optical methods, inparticular a holographic interferometry; that will allow to predict more reliably any occurrence of disc vibrationsduring its working as a part of the engine.
Results of numerical modeling of two-phase liquid / gas flow on the basis of a simplifield model of oil chamber
Authors: Lisitcin A. N. , Badernikov A. V. , Pechenik E. V.
Published: May 2017

Numerical simulation results of multiphase liquid/gas flow are presented. Calculation was preformed forsimplified bearing chamber. Work was kept within the framework of developing the methods of multiphase flows modeling in oil chambers of gas-turbine engine. At present there is no the instrument of the analysis, allowingto simulate the oil flow in oil systems, and oil chambers of gas-turbine engine. The tightening requirementsto mass, overall dimensions and performance of the engine need to reduce of the oil system sizes andamount of the oil, used for lubrication and cooling of bearing with increasing of their resource. At present, oilchamber design based on successful previous experience of the similar work, but performance of oil system ischecked only in process of the engine test. This problems in this case lead to significant time and financial expense,so this instrument of analysis allow simultaneously increase the bearing resource, reduce mass and size ofthe oil system. The most rational model of multiphase flow was also chosen and analysis of the mesh size influenceon steady calculation results was made.
Development of methods of modeling and computer-aided design of compressors
Authors: Krivosheev I. A. , Rozhkov K. E.
Published: May 2017

Discusses the methods of calculation allowing to calculate the characteristics of cascades of profiles, rowsblade, the compressor as a whole. Make improvements to previously known methods of calculation. It is proposedto allocate an additional (along the surface current) elementary channels that can achieve output of rowsdiagrams parameters. Preparation thus permits the compressor, in turn, to calculate the characteristic of the developedengine steady and unsteady modes with high accuracy. The proposed method allows the selection ofgeometric parameters of blade rows, and in operation - perform account the influence on the characteristics ofchanges in the geometry of the blades (due to erosion, dirt, etc.). Allows you to analyze the effect of prepollutionand erosion of the blades to change the characteristics of the nodes, and the results of the identificationof the plant model to solve the inverse problem - to identify the actual values of pollution and erosion in specificstages and crowns. The resulting geometry of the rims may be used as an initial approximation for the boundaryconditions at the solid-state 3D modeling and gas-dynamic calculations in СAE- systems such as Ansys CFX.
Influence of tension and contact stress on sliding in cylindrical roller bearings in support of gas turbine engines
Authors: Belomytcev O. M. , Pischalnikov A. B.
Published: May 2017

The tie between coefficient of slip and tight in a roller bearing 1032930 rotors of the turbine jet of PS-90family with a rated mounting gap of 0,0425 mm is established. Tight in the bearing is defined in the estimatedway depending on thermal deformations and inertial forces. Values of temperatures are taken from bench tests ofthe engine in case of rotational speeds from 9228 to 11308 RPM, the values of tight corresponding to them dependalso on fit of an outside ring with the casing (the damping sleeve). In case of fit with tight in the bearingtight makes from 0,021 to 0,058 mm, in case of fit with a gap from-0,0059 to 0,0478 mm. Owing to volume compressive stress of a shaft and stretching of the casing with a bearing outer ring of value of contact deformationsand stress from tight considerably decrease, expressions for determination of each type of deformationsare given. Stress of contact deformations is determined by a formula of Hertz and can change from 0 to 901N/mm2 depending on rotational speed and fit of an outside ring with the casing. Curve dependences of values oftight, temperature, contact stress and coefficient of slip from rotational speed are constructed, so in case of tightfrom 0,0464 to 0,0558 mm and stress from tight of 659-895 N/mm2 the coefficient of slip makes about 2%. Thevalid stress in contact is unknown as conjugation of an outside ring to the casing has indefinite character, in caseof the combined support the dispersion on deformation of a ring significantly will decrease that will lead tosmaller dispersion on such indexes as coefficient of slip and longevity of the bearing.