bluuebunny/crossref_metadata_2025 huggingface dataset:
Interconnection of propagation velocity and electrical conductivity of flame in ICEs
Authors: Ivashin P. V. , Ramazanov M. P. , Tverdokhlebov A. Y. , Shaikin A. P. , Yasnikov I. S.
Published: May 2017

Investigation of regularities of interrelation between the local propagation velocity and electrical conductivity of flame with varying composition of the mixture in a spark-ignition engine was conducted. The electrical conductivity and the velocity of flame propagation near the spark plug with the average temperature in the combustion chamber being practically constant vary in the conditions of the experiment carried out. The power dependence between electrical conductivity and propagation velocity of flame is revealed in case the air-fuel ratio changes. This can be described by power dependence. The electrical conductivity of flame is shown to depend on the speed of chemical reactions in confined turbulent combustion. The results of the research can be used to develop methods of diagnosing local intensity of burning in combustion chambers.
Correlation and regression model for the assessment of circular non-uniformity of the gas temperature field at the outlet of small gas turbine engine combustion chambers
Authors: Lukachev S. V. , Abrashkin V. Y. , Lansky A. M. , Matveev S. G.
Published: May 2017

The paper deals with the problems of modeling circular non-uniformity of the gas temperature field (GTF) at the outlet of small gas turbine engine combustion chambers.. Correlation and regression dependence for estimating circular non-uniformity of the GTF is obtained with regard for the dimensions, the range of its application is identified.
Analyzing the quality of preparing fuel-air mixture and its influence on NOx in a low emission gas turbine engine combustion chamber
Authors: Markushin A. N. , Baklanov A. V.
Published: May 2017

The paper presents the results of research carried out to determine the concentration fields in the swirl flow of swirl burners of various design. The burners are used in combustion chambers working on the principle of burning premixed lean air-fuel mixture. The influence of the quality of pre-operation air-fuel mixture on the NOx emission in a gas turbine engine combustion chamber is assessed.
Development of an algorithm of design calculation of a combustion chamber for microturbine electric power plants
Authors: Matveev S. G. , Abrashkin V. Yu. , Orlov M. Yu. , Lansky A. M. , Makarov N. S. , Matveev S. S. , Anisimov M. Yu.
Published: May 2017

The paper deals with ways of solving some problems that might arise when using computer technology design of gas turbine engine combustion chambers.
Development of a generalized model of heat-mass transfer between fuel drops and gas stream with reference to gas turbine engine combustion chambers
Authors: Tretyakov V. V. , Sviridenkov A. A.
Published: May 2017

The paper presents a generalized model of heating and evaporation of separate fuel drops, taking into account the influence of the distribution of fuel steam concentration around the drop on the evaporation process. Numerical calculations for the operations typical for gas turbine engine combustion chambers are presented. The range of air flow temperatures over which the influence of fuel steam concentration in the drop environment on the rate of its evaporation and the fuel distribution in the swept volume of the combustion chamber is significant has been defined.
Modeling direct fuel injection by a multipin nozzle into the ice combustion chamber using CAE/CAD-systems
Authors: Biryuk V. V. , Kayukov S. S. , Gorshkalev A. A. , Uglanov D. A. , Lysenko Y. D. , Zvyagintsev V. A.
Published: May 2017

The paper describes a model of a combustion chamber with a multipin nozzle of a four-cycle fourcylinder internal combustion engine. The 3D-model is constructed in the Solid Works and ANSYS Gambit software complexes. The model is then exported to ANSYS Fluent for the calculation of the fuel injection processes.
Vortex wind power plant
Authors: Biryuk V. V. , Krasnorutskiy A. S.
Published: May 2017

Proposed to use the vortex wind power plants to generate electricity for compressor stations of gas pipelines. Designed a three-dimensional model and the numerical calculation of the stator wind-power plant at different operating conditions. The distributions of the flow in the computational domain. The dependence of the parameter values in the calculation of the wind speed around the unit.
Method of calculation and analysis of gas flow aerodynamic indices in a vortex wind power plant
Authors: Biryuk V. V. , Uglanov D. A. , Gorshkalev A. A. , Bolshov D. V. , Krasnorutskiy A. S. , Lapshina V. A. , Chertykovtsev P. A.
Published: May 2017

The article presents a semi-empirical method for calculating vortex wind plants. The method takes into account the theory of vortex Ranque effect and the provisions of the hypothesis of vortex interaction in swirling gas flows.
Thermal state of a groind-use gas turbine engine stator
Authors: Grechishnikov O. V. , Balakin A. Y. , Roslyakov A. D.
Published: May 2017

The paper presents materials on the thermal state of a ground-use gas turbine engine stator. The factors that influence the temperature of the case bands of the turbine nozzles and bearings are analyzed. The efficiency of cooling both from the outside of the base members and by hot gases is shown to have a significant effect on the temperature of the stator.
Homogeneous burners of two-staged combustion chambers
Authors: Grechishnikov O. V. , Ostapets I. I. , Roslyakov A. D. , Tsybizov Y. I.
Published: May 2017

The paper presents materials to provide the metering characteristics of two-staged combustion chambers of gas turbines of terrestrial application. The factors that affect the flow characteristics of burners are analyzed, including the working fluid flow pattern in the vortex chamber of the burner. Significant influence of design features and operating modes of the burners in the engine on the flow characteristics is shown. Flow characteristics of the burners with tangential air inlet into the burner cavity are shown to be influenced by the pressure differential.
Evaluating the possibility of using low-temperature thermal energy in liquefied natural gas complexes
Authors: Dovgjallo A. I. , Sarmin D. V. , Uglanov D A. , Shimanov A. A.
Published: May 2017

This paper presents an analysis of the possibility of using the low-temperature thermal energy of liquefied natural gas as applied to the regasification process in an evaporator at a gas distribution station.
Study of the mechanism of flame stabilization in aaluminum-air mixture
Authors: Egorov A. G. , Tizilov A. S.
Published: May 2017

This paper presents a study of the mechanism of stabilization of aluminum-air plume model based on the contact.
Fundamentals of optical measurements of informative components of complex movements
Authors: Nesterov V. N. , Nesterov D. V.
Published: May 2017

Theoretical fundamentals of optical measurements informative components of complex movements on the ba-sis of multivariate test objects are explicated.
Method of production testing of electronic parts
Authors: Nasedkin A. V. , Shumskikh I. Y.
Published: May 2017

The expediency of replacing coatings based on lacquer UR-231 on the film of poly-p-xylylene in electronic units of space instruments. To confirm the possibility of using this coating technique proposed accelerated test and test instrument design unit and an electronic assembly. Made impacts and selection of test equipment. The technique of application of poly-p-xylylene on the working surface of the electronic unit.
Discrete phase converters moving elements rotating units power units
Authors: Danilin A. I. , Grechishnikov V. M.
Published: May 2017

Presents a new class of converters of angular and linear elements rotating units power units, allowing with the minimum of preparation to ensure accuracy and reliability of the control of movements in real operational conditions.
Methodology of analysis temperature stresses in chips
Authors: Krasnoschekova G. F. , Tyulevin S. V. , Nasedkin A. V. , Mishanov R. O.
Published: May 2017

The article describes the method of analysis of thermal stresses in semiconductor chips and foil. The analysis of the main types of thermal stress: bending, shear, internal. The expressions for the evaluation of thermal stresses.
SAR which parasitize the TV signals
Authors: Borisenkov A. V. , Goryachkin O. V. , Dolgopolov V. N. , Zhengurov B. G.
Published: May 2017

The paper describes the system of obtaining radar images, using as a probe signal of TV broadcasting scheme of bistatic SAR. Describes the major functional and design characteristics of the equipment examined formation algorithm radar. Also the results obtained in the course of a natural experiment.
Circuit design receipt autodynes signal to converter displacement parameters elements rotating parts of turbune unit
Authors: Danilin A. I. , Gretskov A. A.
Published: May 2017

Suggests ways to bridge the inclusion of the active transducer element autodyne in order to obtain the info rmation signal to determine the parameters of movement of elements of turbine rotating parts.
Assessment of the error of measurement of the period which has been set by pulse signals, and method of increase of accuracy measurement
Authors: Olejnikov V. A.
Published: May 2017

We consider a method of increasing the accuracy of measurement intervals defined dome shaped signals varying in amplitude. It is proposed a device for performing the method, and a сomparative evaluation of the existing errors and recommended methods. The evaluation showed improved accuracy of the proposed method for measuring 3 ... 4 order in this range of variation of the amplitudes of the input signals.
Device for fitting thick-film resistors
Authors: Piganov M. N. , Shopin G. P. , Stolbikov A. V. , Erendeev Y. P.
Published: May 2017

This work presents device for fitting thick-film resistors to nominal value by single-electrode discharge method. Structural circuit of device is included. Work demonstrates principles of this devices work. Device provides increasing of precision and expanding of fitting ability.
Device for rejection of semiconductor diodes
Authors: Tyulevin S. V. , Piganov M. N. , Chopin G. P. , Arhipov A. I.
Published: May 2017

The article describes the control device, allowing to make rejection of semiconductor diodes. The proposed device has a high accuracy and reliability of the control. The device allows you to set different rates of change of the out-put voltage of the sawtooth generator. Quality control is performed by diode reverse branch of the current-voltage characteristics. The device provides a better signal / noise ratio at low current levels.
Automated selection of cooling system for radio electronic design of thermophysical
Authors: Goryachev N. V. , Trusov V. A. , Yurkov N. K.
Published: May 2017

Explain the principle of automated selection of uniform design of the cooling system, implemented in the pr ocess of designing termal electronic means, which uses the results of natural and computational experiments.
HF radio communication systems: development, production and perspective solutions
Authors: Luchin D. V. , Spodobayev M. Y.
Published: May 2017

The article contains the review of development of the Radio Research Development Institute Samara Branch in the area of creation of various equipment for the communication channels working in HF range. Thus presents system researches on a number of the main directions of a radio communication, development of antennas and antenna systems, including original designs in the form of ring lattices are allocated, examples of successful solutions of creation of the equipment with the improved noise stability and capacity. All development is accompanied by the corresponding information support and creation of special software products.
Structure of arterial blood pressure monitors
Authors: Fedotov A. A. , Akulov S. A. , Akulova A. S.
Published: May 2017

This article is devoted to constructing instrumental tools of noninvasive measurement of arterial blood pressure. The structure of blood pressure monitors based on simultaneous using of oscillometric and auscultatory measurement methods is considered.
Airborne LIDAR in ensuring gliding UAV flight mode
Authors: Leonovich G. I. , Matyunin S. A. , Paranin V. D. , Shornikov A. M. , Savelyev M. V.
Published: May 2017

The application of airborne aerosol lidar to search and identify the vertical direction of air flow - thermals. Describes the working principle, the basic components and parameters of the LIDAR transceiver node. The algorithm application in LIDAR glider mode in summer UAV.
Analysis of random uncertainties of heart rate variability
Authors: Fedotov A. A. , Akulova A. S. , Akulov S. A.
Published: May 2017

The article is devoted to analysis of random uncertainties of heart rate variability indices. The article contains the algorithm of Hurst indicator calculation based on RS-method and algorithm of calculation of fluctuation coefficient based on Detrended Fluctuation Analysis. The dependence between relative uncertainty of heart rate variability indices and absolute uncertainty of measurement of beat-to-beat intervals is estimated. The conclusion about sensitivity of heart rate variability indices used in the article to the uncertainty of measurement of beat-to-beat intervals is made.
Features computer simulation cluster charactiristics electromagnetic converters
Authors: Merkulov A. I. , Lavrov A. Yu. , Burkov D. S.
Published: May 2017

The paper discusses the features of the cluster modeling of eddy current probes, taking into account their mutual influence. The necessity of taking into account both the total intensity of the magnetic fields of the current cluster members eddy current probes, and the resulting cross-section of the magnetic fluxes of each transducer, which is structurally unrestricted.
Research of the dynamics of condensed product deposition
Authors: Tsaplin S. V. , Bolychev S. A.
Published: May 2017

The paper is devoted to the research of structural nonmetallic materials used in the construction of spacecraft for mass loss and gas release in a vacuum-thermal environment, as well as the research of the dynamics of deposition of gas release condensed products on the optical surfaces of optical equipment. A test bench has been developed for carrying out research of the dynamics of deposition of condensed products based on quartz crystal microbalance. In accordance with the State Standards GOST R 50109-92 mass loss and gas release tests of structural non-metallic materials (fiberglass, fiberglass honeycomb panel, polyurethane foam, tapes, textiles, adhesives, etc.) used in spacecraft construction have been carried out. The effect of the deposition of condensed products of gas release from these materials on the transmission coefficient of the optical element is determined. A conclusion about the possibility of using these materials in constructing spacecraft is made.
Nonparaxial iterative calculation of diffractive optical elements focusing in a subwave light spot
Authors: Bogdanova E. Y. , Khonina S. N.
Published: May 2017

The main efforts in overcoming the diffraction limit have been recently concentrated on the use of damped waves. The implementation, however, is connected with a serious drawback: superresolution is attained only in the immediate vicinity of the device, namely, at a distance of less than the wavelength. It is, therefore, impossible to use the available results, in particular, to reduce information on optical media. The aim of the paper is calculation of optical elements for subwave focusing of a monochromatic wave at a distance of several dozens of wave lengths. The problem of overcoming the diffraction limit expressed in accordance with the Abby theory and the Raleigh criterion dealt with in multiple fundamental and applied investigations is discussed in the paper. The analysis of subwavelength localization of radiation based on the interference effect that makes it possible to reduce the sizes of a light spot due to redistribution of energy in the peripheral area holds a prominent place in the paper. Calculations are performed using the iterative algorithm based on the method of plane wave expansion and the method of main directions. The problem is considered for the cylindrical and radial cases. Special attention is given to the search of solutions that would be more convenient for practical implementation. Prospective viability of developing the solution of the problem for data storage, contactless probing and nanolithography is demonstrated.
Method of compression of digital halftone images on the basis of markov chains with several states
Authors: Petrov E. P. , Harina N. L. , Rzhanikova E. D.
Published: May 2017

The paper presents a mathematical model (MM) of a digital halftone image (DHI) on the basis of a two-dimensional Markov chain with several states; its adequacy to real images is analyzed. On the basis of MM a method of DHI compression is developed. The method provides separation of DHI into binary images with subsequent combining of two digits in a plane. Each plane is considered as a two-dimensional random Markov process with several (N=4) states. On the basis of the theory of random Markov processes prediction of the plane elements is carried out. All incorrectly predicted elements are located in a bit stream and serve as a reference for the recovery of the image. Separation of areas containing background noise with a structure similar to the white gaussian noise (WGN) is carried out beforehand for the planes containing low- order bits, these areas are not stored, they are filled with WGN samples in case of restoration. The efficiencyof the method is no inferior to that of known methods of compression based on DCT or DWT, it does not involve computing operations and makes it possible to work with multidigital images (8 and more digits) without increase in the time of compression due to parallel processing of the planes.
Calculating sound insulation of a sandwich structure on the basis of the «inverse matrix» method
Authors: Popov P. A. , Osipov A. S. , Sindyukov A. A.
Published: May 2017

Multilayered structures are widely used in housing construction, shipbuilding, aviation and space-rocket engineering. In designing such structures it is necessary to estimate their sound insulation capacity for the forecasting of levels of noise taking place in this or that premise or compartment. The paper presents a methodology of calculating sound insulation of a multilayered structure developed on the basis of solving wave equations in each of the layers taking into account the incident angle of sound waves and losses in layers; introduction of boundary conditions establishing equality on the borders of media of normal oscillatory speeds and acoustic pressure; drawing up a system of algebraic complex equations and a matrix equation corresponding to them; drawing up an inverse matrix of factors at functions of acoustic pressure. Examples of calculating factors of sound insulation for multilayered structures with various parameters are presented (superficial weights, thickness of layers, various incident angles). A graphic comparison of the results of calculations using the methods of inverse matrix and the impedance method as well as a graphic comparison of results of flight-design measurements (FDM) of the sound insulation of a regular head part, consisting of layers of coal tape, fiber glass fabrics, aluminum honeycombs and a layer of polyurethane foam are given. The results of calculation using the inverse matrix method are given and the advantage of the method is emphasized.
Deposition of aluminum coating on items made of high-strength steel by chemical vapor deposition of an organometallic compound with the use of a catalytical additive
Authors: Pugin A. V. , Gafurov I. I.
Published: May 2017

The paper presents the results of work involving chemical vapor plating of an organometalic compound of aluminum coatings on a high-strength steel backplate using a catalytical additive. The process of coating deposition is carried out in a sealed chamber with subsequent capture of decomposition products in a nitrogen trap, which provides environmental safety of the process. The paper describes the choice of a catalytical additive among the following liquids: titanium sec-butoxide, titanium tetrachloride, three-n-propylamine used to reduce the deposition temperature. It was found that the deposition of pyrolysis-induced aluminum coatings using catalytical additives does not change the mechanical properties of high-strength steel. Corrosion tests have shown that the protective properties of samples with pyrolysis-induced aluminum coatings are superior to those of zinc coatings.
Models of reliability and determination of acceptable periodicity of maintenance of ageing aircraft fleet
Authors: Pisarenko V. N.
Published: May 2017

Mathematical models of aircraft maintenance are discussed in the paper. The first model is that of aircraft downtime, which is a function of the number of periodically performed technical operations. The second model is that of optimal maintenance periodicity to support airworthiness in conditions of providing a given level of aircraft reliability. The third model is an optimization model of aircraft maintenance costs and providing maximum profit in market economy conditions. Using the theory of differential equations as well as the theories of reliability and renewal formulae of calculating optimal allotted aircraft downtime during periodic technical operations aimed at supporting the airworthiness as well as the formulae of optimal maintenance periodicity, optimal number of maintenance operations and getting maximum profits from flight operations have been found. The proposed models are investigated with a view to specifying acceptable maintenance periodicity with regard for the cost-benefit ratio of aircraft maintenance and the possibility of using them to optimize the maintenance of the ageing fleet of civil aviation. The calculations made show the necessity of decreasing maintenance periodicity in order to optimize the servicing and efficient use of the aircraft ageing fleet.
The nature of «black spots» formation on the surface of large parts made of aluminum alloys in the process of anodic oxidising
Authors: Semenychev V. V. , Salakhova R. K.
Published: May 2017

The causes of black spot defects detected on the surface of large parts made of aluminum alloys (D16chT, 1973T2, V95pchT2, V95pchT3) following anodic oxidation are investigated in the paper. A hypothesis of such defects appearing during the dissolution of intermetallics on the surface of a part in the process of etching during anodizing was put forward and tested. A technique was developed for this purpose the essence of which was that an intermetallic was detected on a polished sample and using a microhardness tester the area including the intermetallic was marked to facilitate its subsequent detection at the end of the specimen etching. After the etching of the specimen during periods of different duration in an alkaline bath of the anodizing line the area containing an intermetallic previously labeled using the microhardness tester was detected by microscopic observations and photographed. The duration of the etching process was 120 seconds and consisted of 8 cycles. Metallographic tests of the specimens. revealed the fact that in the process of etching of an aluminum alloy dissolution (etching) of intermetallic particles opening out on the surface of the part takes place. Subsequent anodic oxidation leads to the visualization of defects which have the form of black spots.
Research of a heat-resistant intermetallic underlayer for the heat-shielding coating of gas turbine engine turbine blades
Authors: Tarasenko Yu. P. , Tsareva I. N. , Berdnik O. B. , Fel Ya. A. , Krivina L. A.
Published: May 2017

The paper presents the results of research of the structure as well as physical and mechanical properties of a heat-resistant intermetallic coating of a Ni-Co-Cr-Al-Y system produced by the method of high-energy plasma powder spraying and used as a substrate in forming a heat-shielding zirconium dioxide coating. A coating is produced with an intermetallic phase composition (b-NiAl+ g-Ni3Al) and spheroidal grain microstructure. The density of the coating is r=8200 kg/m 3, the microhardness is Нm=7,85 GPa and the roughness is 5mkm. According to the results of testing the heat shielding of the wall of a turbine blade made of the ЖС6Ф alloy with the help of a heat-shielding ZrO2 coating with a Ni-Co-CR-Al-Y substrate the metal temperature reduction amounted to 398 K. The coating is intended for the protection of the working surface of various-application gas turbine engine turbine blades against high-temperature gas corrosion in the form of a substrate for the heat-shielding zirconium dioxide coating, and also as an independent heat-shielding coating. The plasma heat-shielding coating for the Ni-Co-CR-Al-Y system has been tested as a substrate for a heat-shielding coating of zirconium dioxide with a view to extending the service life of turbine blades (made of a heat-resistant ЖС6Ф alloy) of the NK series gas turbine engine turbines.
Universal approach to the description of working medium chambers for simulating hydraulic and pneumatic systems
Authors: Timofeyev Yu. M. , Khalatov E. M.
Published: May 2017

The article is concerned with the consideration of methods of mathematical formulation of processes in interthrottle chambers and working medium reservoirs used to simulate the operation of hydraulic and pneumatic systems.

Consideration has been given to a general approach to the development of mathematical models of hydraulic and pneumatic systems; the stages of constructing models are also presented.

A generalized mathematical model of a heat-insulated chamber with variable volume is presented. The derivation of standard mathematical modules of the above chamber on the basis of the generalized model is given. The assumptions taken into consideration with the existing methods of describing the processes taking place in chambers and reservoirs of hydraulic and pneumatic systems are analyzed. The shortcomings of the existing methods are shown.

An approach to forming a mathematical formulation is proposed, which is universal in its nature and reflects the processes under consideration in full measure. The proposed description method is based on the laws of conservation of thermodynamics of a variable-mass body. A special record of thermal and caloric equations of the state model makes it universal and independent of the working medium type. When compiling the digital models of chambers, both equations of working medium state and tabulated reference data can be used.

Design diagrams and mathematical models of heat-insulated chambers with variable and constant volumes are presented as an example. A digital model is presented and the results of modeling the operation of hydraulic and pneumatic actuators performed with the use of the proposed method are given. The digital model is implemented in the training version of the Russian software package Simulation in technical devices.
Assessing skills level of flying cadets
Authors: Kuatov B. Z. , Kurtaev S. Z.
Published: May 2017

The paper presents an analysis of works attempting verification of the adequacy of both simulation and simulators themselves. However, these attempts are limited to determining the fact of adequacy or inadequacy of the systems being checked, which cannot be used to identify the skills acquired when using them in accordance with the input generalized classification. The adequacy itself is a concomitant sign of inadequate use of simulators. However, since the established reference base for assessing the adequacy of simulators does not make it possible to present it in the form of the indicator of the concomitant sign of inadequacy of use of simulators, the task of prime importance is to determine its quantitative form that would make it possible to eliminate the disparity of proficiency assessing. A system of assessing flying cadets skills level is proposed in the paper. Some propositions concerning the assessment of probabilistic levels of cadets proficiency are discussed. A five-mark grading system with pluses and minuses (12-mark system) for assessing the level of flying cadets proficiency is proposed in the paper. The system allows increasing the accuracy of flight skills identifying.
Forecasting an increment in the parts’ endurance limit due to surface hardening
Authors: Pavlov V. F. , Filatov A. P. , Semyonova O. Yu. , Sazanov V. V. , Mikushev N. N.
Published: May 2017

Rolling with various forces influence on the endurance limit of specimens made of steel 20 of 50 mm diameter with cuts of various radiuses and pressurized bush has been examined. The estimation of the surface hardening influence on the specimens endurance limit has been carried out using two criterions, namely: residual stresses on the dangerous section surface and the average integral residual stresses through the dangerous section thickness, equal the fatigue non-propagating crack critical depth. On base of carried out experiments its been established that the employment of the average integral residual stresses criterion is more rightful for the endurance limit prediction of surface hardened cylindrical specimens made of steel 20 with diameter 50 mm with cuts and pressurized bush taking into account the concentration degree. The residual stresses on the concentrator surface is not acceptable as a criterion for the endurance limit prediction of surface hardened specimens made of steel 20 with cuts and pressurized bush because the corresponding coefficient of the criterion influence on the endurance limit has a essential dispersion. Besides, the dependence of the fatigue non-propagating crack critical depth on the specimen (part) dangerous cross-section sizes has been confirmed.
Automated profiling of tool electrode in electrochemical pulse machining
Authors: Nekhoroshev M. V. , Pronichev N. D. , Smirnov G. V.
Published: May 2017

Compressor blades are the most complex and critical parts of a gas turbine engine. It is driven by the cost of their production, as well as the requirements in terms of reliability and service life. A promising method for manufacturing the blades is a pulse electrochemical machining (ECM), the main advantages of which are the lack of power and thermal effects on the treated surface, the longevity of the tool, at low values of roughness parameters when working at high current densities in high-precision copy form and stability during operation of the process at a sufficiently small interelectrode gaps. In this paper we have set out the principles for the implementation of the model applied to the electrochemical shaping pulse echo that will deliver engineering simulation methodology for processing and profiling tool electrode in a real production. In solving the problem of electrochemical formation, taking into account the factors influencing the process was proposed algorithm describing the process of pulse echo, which was based on the use of a numerical method for sample processing in time and space. This algorithm will automate profiling tool electrode during pulse electrochemical treatment.
Development of parameter-orientedmodels of bladed disks for static strength analysis
Authors: Shklovets A. O. , Urlapkin A. V. , Boyarov K. V.
Published: May 2017

In today's competitive production is important shortening time-processing products, which can be achieved using modern digital technology. Work is devoted in creating parametric finite element models of the compressor and the low-pressure turbine rotor wheels and a free turbine of modernized gas compressor unit NK-36ST using the package ANSYS Mechanical. The developed models of blades and disks allow to control grid of finite elements and the geometrical parameters of the structure in a wide range: the geometry of the blade, shapes and sizes for radius transition, shank geometry, dimensions of structural elements of the disc. The geometry of the airfoil blades is read from the file received as a result of gas-dynamic calculations. Models rotor wheels consider contacting a locking connection. Approach to the creation of the finite element mesh is to use structured and hybrid scheme that reduces the amount of grids and as a consequence, reduces the calculation time. The use of such models for the calculation of static strength under changing the geometric parameters of the gas-dynamic optimization when allowed to make them as soon as possible. With the help of the developed models in the future produced calibration calculations and confirmed reserves of strength.
A new approach to teaching descriptive geometry at higher school from the perspective of through preparation of a modern specialist
Authors: Ermakov A. I. , Chempinsky L. A.
Published: May 2017

The adaptation to a new design and manufacture technologies of products is related with necessity for forming а new of thinking of professionals. A more research should be given to learning 3D modeling. A description of processes of educational activities is presented in the form of contextual diagrams IDEF0 models for preparing specialists at the Faculty of aircraft engines SSAU, its decomposition by type of training. The goals of the Engineering graphics department, in addition to knowledge of the creation 3D modeling, are learning the basics of document management and methods of standard models parameterization and their using. At the same time a number of problems is being solving: a gradual (from the beginning) familiarization with capabilities and a consequent acquisition of skills in an environment of modern integrated CAD / CAM / CAPP systems; an optimal solution of descriptive geometry, in particular, using and development of spatial imagination, the exact solution of the metric and positional problems; achievement the new level of geometrical-graphic preparation by using parametric models for performing 3D details, automated construction the drawings on a plane with GOST rules ESKD, which significantly reduces the routine work in creating technical documentation for the following departments. Realization of this approach in training specialists allows to use a 3D model constructions for engineering analysis of their functioning in the conditions of use, as well as to model a manufacturing process in the virtual space.
Improving the accuracy of assessing the position deviation in coordinate measurements of GTE compressor and turbine blade profiles
Authors: Bolotov M. A. , Pechenin V. A. , Ruzanov N. V.
Published: May 2017

The paper proposes a method for increasing the accuracy of the iterative closest point (ICP) algorithm used in metrology problems in determining position deviation. The target of using the method for determining deviation profiles were compressor blades of a gas turbine engine (GTE). We propose to formulate the problem of the optimal match in the developed method as a multicriterion task including the criteria of the minimum of squared distances, differences of normal vectors and difference values of the depth of camber at the appropriate points of the superposed profiles. Different variants of reducing the problem to the use of a single integral criterion including the above-mentioned ones are considered. The problems of optimization were solved using the quasi-Newtonian methods of sequential quadratic programming. The proposed new method of improving the ICP algorithm based on geometric features showed greater accuracy in comparison with the discussed methods for optimizing the distance between the fitting points, especially in the case of a small number of measurement points on the profiles.
Development of the technology of diagnostics of turbo-jet aviation engines by a filtering element with a diagnostic layer
Authors: Drokov V. V. , Drokov V. G. , Muryshenko V. V. , Mukhutdinov F. I. , Khaliullin V. F.
Published: May 2017

The possibility to use the Dirt Alert diagnostic layer to diagnose PS-90A engines equipped with QA-07930-01 filter elements by Pall Corporation is shown. Division of Dirt Alert diagnostic layer into parts according to their height allows to get wash samples and to make diagnostics of PS-90A engine without disassembly and replacement of main filter element before completion of its mission. Device and ultrasound methodology of wear debris particles extraction from diagnostic layer are developed. It is determined that wash sample presentability is provided by single passage of diagnostic layer in tape drive during 20 minutes. The possibility to use a statistical model of operational PS-90A engine equipped with the filter element without diagnostic layer that had been previously developed basing on wash sample analysis in order to make a diagnostic decision on PS-90A engines equipped with QA-07930-01 filter element is considered. In this model, wear debris particles ratings are used as diagnostic parameters. It is shown that parameters of wash sample wear debris particles extracted from diagnostic layer of QA-07930-01 filter element do not differ from QA-07930 filter element wash sample particles parameters. It means that PS-90A engine equipped with QA-07930-01 filter element technical state evaluation is possible with use of the statistical model of operational PS-90A engine equipped with the filter element without diagnostic layer developed basing on scintillation analysis of wash sample taken from QA-07930 filter element. The conclusion is made that perspective direction to get express and reliable results of technical state evaluation for PS-90A engine lubrication system is to equip engines of this type with QA-07930-01-type filter element.
Verification of energy efficiency of a low-thrust liquid-propellant engine with the deflector-centrifugal injecting pattern
Authors: Ageenko Y. I. , Pegin I. V.
Published: May 2017

The article gives information about developed in Design Bureau Chemical Machinery behalf A.M. Isaev deflector centrifugal pattern mixing of propellants nitrogen tetroxide and unsymmetrical dimethylhydrazine, in which established liquid rocket engines (LREST) in a wide range of rods from 25 to 400 N. Design Bureau Chemical Machinery behalf A.M. Isaev on the basis of joint with KUAI (now SSAU named after Korolev, Samara) and studies on the characterization of the primary oxidant film on the deflector, the parameters of the secondary oxidant film on the inner wall of the combustion chamber, the parameters of the film cone spray nozzle centrifugal fuel in a venue with a secondary film oxidant parameters of the layer of liquid-phase mixing the oxidizer and fuel components on the inner wall of the combustion chamber was established mathematical model calculations of liquid-phase mixing of the components in the mixing element LREST with centrifugal deflection circuit mixing the components on the wall of the combustion chamber. Based on this Design Bureau Chemical Machinery behalf A.M. Isaev developed technique of calculations and design of LREST with centrifugal deflection circuit mixing fuel. Using this method in Design Bureau Chemical Machinery behalf A.M. Isaev designed iPart LREST 25, 50, 100, 200, 400N, with deflector centrifugal mixing scheme. Parametric studies were conducted LREST of 25, 50, 100, 200, 400 N to determine the degree of influence of various design and operational parameters of the element, such as the angle of leakage jets on the deflector angle leakage of primary films on the wall of the combustion chamber, the mean free path of the secondary oxidant film the wall of the chamber performance-liquid phase mixing of the fuel components. The results of experimental studies have confirmed the increased energy efficiency of small thrust jet engine thrust of 25, 50, 100, 200, 400 N with deflection centrifugal mixing scheme, expressed in a high specific impulse of more than 3000 m / s at the same time a large margin the temperature of engine components. Maximum temperature of the wall of the combustion chamber is at 1200 С that is provided by a large margin 600 С (permissible material temperature chamber - niobium alloy with molybdenum coating bi-silicified MoSi2 1800 С).
Development of methods of modeling and computer aided design of gas turbine engines
Authors: Krivosheev I. A. , Kozhinov D. G.
Published: May 2017

Methods of computer-aided design and modeling of GTE are discussed. The results of development of auniversal, open technology for simulation of sophisticated technical objects are described. The proposed technologyallows solving simulation tasks for modeling the performance of aircraft engines as a part of an aircraft.Other technical objects successfully simulated using this technology, include power plants of various types. Theexperience of automated selection of construction layout of gas turbine engines is shown. Co-modeling of gasturbine engine and its automated control system is described. The research was conducted using domestic PLMand CAD/CAE systems, such as SPRAD, Stalker, and a number of other applications for technological design ofparts and components of gas turbine engines. The effectiveness of combining the functionality of the multi-levelsimulation with the means of CAD/CAE/PLM systems is shown. Shown use DVIG at seminatural simulationTVVD (D-27) and its ACS. A method for obtaining the characteristics of compressors, using the developed simulationsystems blade rows, steps, compressors and dvigateley.V including new approaches to the design ofturbomachinery (tracking method jets - ISO). Shows the results of the development of LSI components for theorganization Operation Support GTD to-date. In particular, it is described developed IETM (Interactive ElectronicTechnical Manual) Operating GTR (gas turbine drive) AL-31ST used in Gazprom at compressor stations.
Development of methods of carrying out experimental research of measurement errors for sets of geometrical parameters on NC equipment as in the case of a turbine disk
Authors: Bolotov M. A. , Alexeev V. P. , Pronichev N. D.
Published: May 2017

The technique of experimental studies of measurement error groups of geometrical parameters on CNC equipment on example radial-angular positions of turbine disk is developed. This technique consists of a series of successive stages: analysis of parts and groups of geometric parameters; calibration of the measurement system; binding to the details; selection of the measurement cycle; development of the control program to be measured; measurements on CNC equipment and KIM; comparison of measurement results; error analysis, the establishment of their causes and the proposal to reduce them. For the analysis of obtained results is used a statistical method for determining the total error. The random component was evaluated by multiple repetition of the process of measuring the centering holes on CNC equipment and statistical processing of the results. The systematic error was estimated by comparing the data obtained as a result of control on CNC equipment with reference values. As reference data taken measurements on coordinate-measuring machine Global Performance 07.10.07. Control radial-angular arrangement centering holes turbine disk is possible using standard measuring cycle equipment. It is worth noting the dependence of the accuracy of measurement of the nominal angle of the dowel holes. With the increase in the angle measurement error increases. This technique is universally applicable to the measurement of many geometric parameters of the different parts.
Development of thruster chamber operating on oxygen-hydrogen fuel
Authors: Salich V. L.
Published: May 2017

The article presents the results of the development chamber thruster in the perspective oxygen-hydrogen fuel. Was established experimental model, whose main element is the chamber body, taken from the production engine and newly developed mixing head comprising a spark plug, fuel injectors, fuel manifolds, fittings for supplying fuel components, fittings for the pressure measurement. Ignition of the fuel mixture when starting chamber is electric plasma method. Fire tests were conducted camera manufacturer in terrestrial conditions on the experimental setup, which allows to measure the thrust, pressure in the combustion chamber and fuel reservoirs, determine the cost of fuel components. The test results are presented in the form of values of thrust, specific impulse, the coefficient of specific impulse at different total fuel mass flow and the fuel components ratio (different ratios of excess oxidant), suggest the achievement of acceptable energy characteristics. During the tests also confirmed the launch of a reliable chamber in a wide range of variation of the coefficient of excess oxidant confirmed efficiency of the engine during long hot work.
Iodine as an alternative propellant for electrojet engines
Authors: Ostrovskiy V. G. , Smolentsev A. A. , Scherbina P. A.
Published: May 2017

In the article the analysis of iodine as a propellant electric propulsion for electric thruster with closed electron drift is provided. This compares the iodine thruster performance with the same parameters using the traditional propellant - xenon. Advantages of electro-propulsion on the iodine compared to installing, using xenon. Justified the use of iodine as a propellant for high power thrusters. Presents the preliminary design and the results of the first tests of stationary plasma thrusters on the iodine. The article provides information about the progress of RSC Energia corporate research, the purpose of which is to develop a bench-top system for the storage and supply of iodine. It is shown and described the system layout storage and supply for experimental testing electric propulsion on the iodine. Also shown plans of RSC Energia in further research on the development of electric propulsion on the iodine. The article presents a variant of the high power thrusters on a propellant of iodine, which offers the challenge of ensuring the life of the thruster and the use of thermionic cathode. This article provides an overview of Western achievements in the use of propellant iodine in electric thruster.
Mathematical modeling and investigation of the process of thermal theatment of aluminum ingots on the basis of regulated convective heat transfer
Authors: Gorshenin A. S. , Krivosheev V. E.
Published: May 2017

Existing cooling technology of cylindrical aluminum ingots dont provide the same speed of the temperature in all parts of the ingots. The most appropriate use for cooling of ingots special camera. Existing calculation methods and modes of cooling, which take into account the geometric characteristics of the charge and a cooling chamber, and would provide the same cooling rate in all parts of the bars are missing. Therefore, the authors addressed the issue of mathematical modeling of the process of cooling aluminum ingots on the basis of the regulated convective heat transfer. When developing mathematical models were formulated assumptions, mathematical and physical formulation of the problem. The mathematical model included the analytical model of heat transfer in the system aluminum ingots - cooling air, the system of differential equations, initial and boundary conditions. A mathematical model has allowed to carry out an analytical study of the cooling process with constant and variable operating conditions and design factors such as the speed of the cooling air, the diameter of the bars and the height of the channel between the bars. An analytical study has allowed to formulate the algorithm, providing a nominal speed of each cooling of the ingot in a horizontal row by controlled cooling. To prove the validity of the analytical model was performed experimental study. The discrepancy between experimental data and analytical values averaged 34%.