Том 13, № 5 (2012)
- Жылы: 2012
- Мақалалар: 52
- URL: https://journals.eco-vector.com/2712-8970/issue/view/7704
Articles
ABOUT PERMISSIBLE LIMITS AT ASSIGNMENT OF BOUNDARY EFFECT FOLLOWING THE SHOCK WAVE
Аннотация
The author considers influence of boundary effect following the shock wave on evolution of the shock wave itself, when it penetrates the shift layer. Permissible limits at assignment of boundary effect are revealed. Concepts of Uskov’s invariant and angle are introduced.
Siberian Aerospace Journal. 2012;13(5):6-12
6-12
CALCULATION OF TIME-OPTIMAL MANEUVERS OF A SPACECRAFT IN CASE OF CHANGING MODES OF ORIENTATION
Аннотация
The author considers angular movement of a space vehicle. The spiro consists of two phases: workable control (in an apogee vicinity) during which the device is to solve a target problem, and duty control phase During duty control phase of the orbit the problems of orbit correction performance are solved with the help of electrojet engines and gravitational unload of accumulated angular momentum of operating members, namely, flywheels. At the process, for transition to orbit correction modes or for transition into demanded orientation on workable control phase, program maneuvers of a space vehicle are made. From the point of view of increase in time taken for gravitational unload is expedient to minimize durations of maneuvers of a space vehicle. Comparison of two ways of maneuvers of a space vehicle, optimum on speed [1, 2], is made. Comparison is made by the results of mathematical modeling at various sets of initial data.
Siberian Aerospace Journal. 2012;13(5):12-14
12-14
14-17
ANALYSIS OF POWER LOSSES IN SWITCHING SHUNT REGULATOR
Аннотация
The paper presents the results of power losses analysis in switching shunt regulator versus harness length and duty cycle, got by means of P-Spice simulation. The authors show that the power losses in switching shunt regulator are about 30 % of total power losses. The rest of losses are the share of shunt and blocking diodes of a solar array, slip rings of solar array drive and harness.
Siberian Aerospace Journal. 2012;13(5):17-22
17-22
ANALYSIS OF OPERATING MODES OF HIGH POWER LED LIGHT SOURCES SUPPLIED BY SWITCHING CONVERTER
Аннотация
The paper presents results o/ experimental investigation o/ operation o/ high power LEDs supplied by switching converter with output current regulation. Dynamic per/ormance o/two LEDs is investigated. Influence o/LED dynamic characteristics on operating mode o/ converter output filter is analyzed.
Siberian Aerospace Journal. 2012;13(5):22-28
22-28
RELIABILITY IMPROVEMENT OF COMPLEX NETWORKS SOFTWARE
Аннотация
The authors describe a model of estimation of reliability of software of complex architecture and options for the construction of multi-version modules and consider variable characteristics of software architecture and estimate cardinality of its optimization.
Siberian Aerospace Journal. 2012;13(5):28-33
28-33
DESIGN OPTIMIZATION OF THERMO-TECHNICAL SYSTEMS OPERATING IN A CLOSED CIRCUIT
Аннотация
This article presents the approach to mathematical modeling of thermo-technical systems. The principles of construction and solutions of systems of equations of mathematical models are considered. Examples of forward and reverse cycles modeling are given.
Siberian Aerospace Journal. 2012;13(5):34-38
34-38
ABOUT NONPARAMETRIC ALGORITHMS OF NONLINEAR DYNAMICAL PROCESSES IDENTIFICATION
Аннотация
The authors consider a problem of nonlinear dynamical systems of Wiener-Hammerstein type identification, when linear dynamical part of the system is in conditions of nonparametric uncertainty. The type of nonlinearity is assumed to be unknown or known completing the parameters. The algorithm for creation of adequate, as root mean square criterion, for models of systems. The proposed method of dynamic objects modeling is on nonparametric estimation of linear and nonlinear sub-systems.
Siberian Aerospace Journal. 2012;13(5):39-44
39-44
INVESTIGATIONS OF NONPARAMETRIC MODELS OF TUBULAR TYPE PROCESSES
Аннотация
The article considers a problem of identification of multivariate systems with static connection of sub-vectors of input variable. The last circumstance leads to the new class of stochastic processes, namely, «tubular» processes. Nonparametric and parametric methods of identification are compared. The results of computer simulation are presented.
Siberian Aerospace Journal. 2012;13(5):44-48
44-48
DATA ANALYSIS IN A PROBLEM OF STATIC SYSTEMS IDENTIFICATION
Аннотация
The authors investigate a problem of identification of multidimensional inertia-free system with delay in conditions of non-parametric uncertainty. The main emphasis is laid on the problem of filling of a matrix of observation for the case when control discretenesses of “input-output" variables differ very much. The filling of the observation matrix technique is offered, numerical results of calculation experiments ,illustrating the efficiency of the offered technique for identification problems solving, are given.
Siberian Aerospace Journal. 2012;13(5):49-54
49-54
METHOD OF AUTOMATIC QUALITY ASSURANCE OF WORK OF TECHNOLOGICAL SYSTEMS
Аннотация
The author presents a method of automatic control of process ofproduction of granulated materials with the use as controllable parameter of selective values of humidity with application of statistical analysis and identification of a kind of distribution.
Siberian Aerospace Journal. 2012;13(5):54-59
54-59
COMPUTER MODELING OF FINITE TWO-GENERATOR GROUPS OF EXPONENT 5
Аннотация
Let B 0 (2,5, k) be the largest finite, provided by two, Burnside group ofperiod of the 5 th step of nilpotency k, and {a 1, a 2} be generators of this group. In this article the growth functions of the groups B 0(2,5, k) relative to A = {a 1, a- 1, a 2, a- 1}, are calculated for cases k = 1, 2, 3, 4, 5.
Siberian Aerospace Journal. 2012;13(5):59-62
59-62
COST ESTIMATION FOR MODERNIZATION OF CRITICAL RELIABILITY SYSTEMS SOFTWARE
Аннотация
The authors present the approach of estimation of cost of software upgrade with the account of different stages of life cycle and putting into effect software redundancy. The calculations of the cost of modernization of the software of the real system are made.
Siberian Aerospace Journal. 2012;13(5):62-65
62-65
ANALYSIS OF APPLICATION OF RELIABILITY ASSESSMENT MODEL OF ENTERPRISE AUTOMATED MANAGEMENT SYSTEMS
Аннотация
The author considers the aspect of application of the offered earlier model of reliability assessment of an enterprise automated management systems, in the case of project development of trade enterprise automation. The purpose is to give system reliability assessment in the form of a certain index and to calculate it at each stage of life cycle of development, and experimentally confirm dependence ofparameters which occur at formulas and to evaluate efficiency of the offered method of reliability assessment.
Siberian Aerospace Journal. 2012;13(5):65-70
65-70
STABILITY OF PULSE-WIDTH MODULATION STABILIZER IN MODE OF INTERMITTENT CURRENTS
Аннотация
In its article, on the basis of the offered by the author new approach to analysis and synthesis of pulse-duration systems, the dynamics of pulse-width modulation stabilizer of tension in the most complex run of pulsating currents is investigated.
Siberian Aerospace Journal. 2012;13(5):71-74
71-74
GEOMETRICALY NONLINEAR MODEL OF AN TRANSFORMED RIM OF A BIG SPACE ANTENNA WITH FLEXIBLE COMPOSITE ELEMENTS
Аннотация
A new geometrical and nonlinear model of a transformable rim of a large space antenna constructed with the use of flexible composite strips, as basic elements, is considered. The decision found will allow to define the optimum form of the bent curvilinear strip and to estimate the stored energy.
Siberian Aerospace Journal. 2012;13(5):75-80
75-80
80-84
H-MODELS FOR NON-INERTIA SYSTEMS WITH A DELAY
Аннотация
The author considers a problem of the new class of processes with а «tubular» structure in the space of “input-output” variables. Modeling of these class processes differs highly from the generally accepted parametric models being a surface of the same space. A question of multidimensional systems modeling having small volume of learning samples is analyzed specially. To develop the trainable parametric models of «tubular» processes, the corresponding non- parametric indicator is introduced. A new class of trainable parametric models, and some results of the numerical investigation are presented.
Siberian Aerospace Journal. 2012;13(5):84-89
84-89
USAGE OF METHODS OF MULTI-DIMENTIONAL DATA PROCESSING FOR ANALYSIS OF ENERGY CONSUMPTION OF ALUMINUM REDUCTION CELLS
Аннотация
The authors present a review of methods of application of multi-dimentional statistical analysis of database of aluminum industry. Estimation of effectiveness of devices and quality of products output is made. Application of major components for the analysis of energy consumption of two potrooms of an aluminum smelter is considered.
Siberian Aerospace Journal. 2012;13(5):89-95
89-95
DECISION MAKING WITH INTELLIGENT INFORMATION TECHNOLOGY ENSEMBLE
Аннотация
Genetic programming algorithm for neural network automatic design is suggested. Ensemble member competence estimations, based on decision making with intelligent information technologies, is proposed. The approach effectiveness is approved on qualificatory and real-world problems.
Siberian Aerospace Journal. 2012;13(5):95-99
95-99
NUMERICAL COMPUTATIONS FOR ARTIFICIAL EARTH SATELLITE POSITION UNDER RESTRICTIONS ON MEASUREMENTS ERRORS
Аннотация
The application of the least squares and minimax methods for near-earth space object position identification under known restrictions on the measurement errors is considered in this article. The computational schemes being used for a space object trajectories parameters evaluating under different measurement errors are studied. The given algorithms accuracy characteristics under different measurement errors distributions are determined. The results of the computations are presented.
Siberian Aerospace Journal. 2012;13(5):99-104
99-104
104-105
MULTIPLE ATTRIBUTE COMPOSITION OF DEPENDABLE CONTROL AND DATA PROCESSING SYSTEMS
Аннотация
The article presents a model of composition of dependable control and data processing system. An iterative procedure of dependable system composition is proposed. Software system of multiple attribute of choice of components of dependable control and data processing system is presented.
Siberian Aerospace Journal. 2012;13(5):106-110
106-110
110-113
DEVELOPMENT AND THERMAL VACUUM TESTS OF HEAT SHIELDS FOR PROTECTION OF MECHANICAL ELECTRIC DRIVE UNIT FROM EFFECT OF “SOLAR TRAP”
Аннотация
The authors present the results of investigations of autonomous thermal control subsystem of the unit of antennas mechanical guidance system. Processing of telemetry data for a revolution of the spacecraft, named «Luch-5A», is done. Critical modes of operation of the subsystem are investigated as well. Experimental investigations of simulation of antenna pointing subsystem operation at the orbit with heat shield and without it are conducted. Verification of the data with the calculated values, obtained by mathematical modeling on the end of each mode, is done.
Siberian Aerospace Journal. 2012;13(5):116-122
116-122
EXPERIMENTAL INVESTIGATIONS OF INCOMPRESSIBLE VISCOUS FLUID IN THE FRONT GAP BETWEEN ROTATING DISK AND FIXED BOUNDARY
Аннотация
Experimental studies of viscous fluid in the front gap between rotating disk and fixed boundary are conducted, a design procedure for determination of parameters of the working fluid in the front gap is developed, comparative analysis with the methods of calculation of other authors is presented.
Siberian Aerospace Journal. 2012;13(5):123-126
123-126
ROTATIONAL FLOWS HEAT TRANSFER IN TURBOMACHINES BASED ON TWO-LAYER MODEL OF TURBULENT BOUNDARY LAYER
Аннотация
Individual case of flow of gas flow induced by rotation of disk is considered in the article. Integral relations of energy equation of dimensional boundary layer for flow with rotary power law velocity distribution is presented. Dependencies for estimation of local heat transfer coefficients of rotational flows with different velocity distribution are obtained.
Siberian Aerospace Journal. 2012;13(5):127-129
127-129
METHODOLOGICAL BASES OF ESTIMATION OF SYSTEMIC ACTION OF ADDITIONAL PAYLOAD ON SPACECRAFT FUNCTIONING
Аннотация
Systemic astion of additional payload on spacecraft functioning is considered. The structure of mathematical model for assessment of this influence is defined. Indicators of resistibility of a spacecraft and hypothesis used are presented.
Siberian Aerospace Journal. 2012;13(5):130-136
130-136
FEATURES OF FORMATION OF CAVITATIONAL CAVITIES IN CENTRIFUGAL HIGH-SIDED PUMP
Аннотация
Features of cavitational processes in a flowing part of high-sided centrifugal pump are considered. On the basis of high-speed registration on visualization of formation of cavitational cavities, the experimental materials describing the form, volume and parameters of development кавитационной to a cavity, are presented. Dependence of change of volume of a cavity, during work of centrifugal pump in a range of the parameters describing stalling mode of a pump unit and following it cavitational self-oscillations in hydro-system of a liquid rocket engine, is obtained.
Siberian Aerospace Journal. 2012;13(5):136-139
136-139
MECHANISM OF OPERATED TELEMETRY FOR A SPACECRAFT
Аннотация
This article presents query-oriented method of receiving telemetry information from the board of a spacecraft, analyses advantages of this method. For implementing this method, the possibility of creation of hardware database is considered.
Siberian Aerospace Journal. 2012;13(5):140-144
140-144
PRINCIPLES OF ON-BOARD CONTROL COMPLEX DEVELOPMENT FOR SMALL SPACECRAFTS
Аннотация
This paper describes the main technical decisions made during design of the on-board control complex for small spacecrafts and determines open technologies and products used in the project. Network architecture and on-board control complex design are presented. The results of the development of the experimental model are given.
Siberian Aerospace Journal. 2012;13(5):144-149
144-149
ELECTROCALORIC AND BAROCALORIC EFFECT IN SOME FERROELECTRIC HYDROSULFATES AND TRIGLYCINE SULFATE
Аннотация
A comparative analysis of electrocaloric and barocaloric efficiency in ferroelectrics Rb x(NH 4) 1-xHSO4 and TGS is performed. A good agreement was found between intensive electrocaloric effects measured experiшentally and calculated using electric equation of state. Barocaloric effects were evaluated by analysis of the experimental data on heat capacity and Т-р phase diagrams.
Siberian Aerospace Journal. 2012;13(5):152-155
152-155
RACEMISM OF TRIGONAL SINGLE RARE-EARTH OKSIBORATES
Аннотация
The authors describe the uncovered racemic twinning in single crystals of RM 3(BO 3) 4 (R=Y, La-Lu; M=Fe, Al, Ga) and its dependence on chemical composition of the crystals. The authors prove that number of left and right isomers can be changed by the introduction of substitute elements in R and M sublattices, which makes it possible to eliminate the influence of twinning on the properties of crystals.
Siberian Aerospace Journal. 2012;13(5):156-157
156-157
METHOD FOR MONITORING OF IMPACT OF MAGNETIC FIELDS IN THE PROCESS OF ELECTRON-BEAM WELDING BY X-RAY RADIATION FROM TREATMENT AREA
Аннотация
Method for monitoring of rnpact of magnetic fields on the electron Ьеат in the process of electron-Ьеат welding is proposed. The mathematical model of collrnated X-ray sensor of he effect of magnetic fields monitoring is developed.
Siberian Aerospace Journal. 2012;13(5):158-163
158-163
THEORETICAL STUDY OF SORPTION AND DIFFUSION OF HYDROGEN IN INTERMETALLIC COMPOUND Mg 2Ni
Аннотация
In this report we present theoretical study of intermetallic compound Mg 2Ni as a promising material for hydrogen absorbtion. Processes of hydrogen sorption and diffusion in the bulk of this material are investigated. The influence of Mg 2NiH x structure features on sorption energy of hydrogen atoms is studied.
Siberian Aerospace Journal. 2012;13(5):163-167
163-167
PECULIARITIES OF MAGNETIC BEHAVIOR OF CRYSTALS Pb 3Mn 7O 15 DOPED BY Fe, Ga, Ge IONS
Аннотация
Structure and magnetic properties of Pb 3(Mn 1-xFe x) 7O 15 with х = 0, x = 0.05, х = 0.1, х = 0.15 and х = 0.2 and Pb 3(Mn 0.9 5Ge 0. 05) JO 15, Pb 3(Mn 0. 95Ga 0, 05) JO 15 single crystals, grown by spontaneous crystallization from solution in melt, are investigated. All grown crystals belong to the hexagonal space group P6 3/mcm. The magnetic properties appeared to be heavily dependent on the level of doping by diamagnetic Ga and Ge ions, as well as by paramagnetic Fe ions. The authors show also the revealed destruction of 3-D magnetic ordering during doping by Ga ions and by Fe ions in the quantity of x > 0.1.
Siberian Aerospace Journal. 2012;13(5):168-170
168-170
LATTICE DYNAMICS OF CRYSTAL HoFe 3B 4O 12
Аннотация
Crystal lattice vibrational frequencies in the center of the Brillouin zone have been determined with the Raman spectroscopy method. The lattice vibrational frequencies, elastic modulus, high frequency dielectric constant and temperature dependence of the lattice heat capacity have been calculated with the use of density functional method.
Siberian Aerospace Journal. 2012;13(5):171-172
171-172
THERMAL PROPERTIES, MAGNETOAND BAROCALORIC EFFECTS IN La0.7Pb0.3MnO3 SINGLE CRYSTAL
Аннотация
The authors present results of investigations of heat capacity, thermal dilatation, intensive magnetocaloric effect and susceptibility to hydrostatic pressure of La 07Pb 03MnO 3 single crystal. Experimental data were analyzed within the frame of the magnetocaloric and barocaloric efficiency of manganites in the vicinity offerromagnetic phase transition.
Siberian Aerospace Journal. 2012;13(5):173-176
173-176
177-181
181-184
INVESTIGATION OF STRUCTURE PHASE TRANSITIONS IN OXYFLUORIDE K 3WO 3F 3
Аннотация
The article presents investigation of vibrational spectra of oxyfluoride K 3WO 3F 3 by Raman technique at different temperatures and under high hydrostatic pressure; the nonempirical lattice dynamics calculation was carried out in framework of generalized Gordon-Kim model. It was shown, that ferroelectric phase in cryolite K 3WO 3F 3 is realized due to displacements of potassium atoms from equilibrium state, as a result of phase transitions at Т1 = 452 K and Т2 = 414 K, but is not due to ordering of anions atoms in octahedron [WO3F3] 3-.
Siberian Aerospace Journal. 2012;13(5):185-189
185-189
INVESTIGATION OF LATTICE DYNAMICS OF OXYFLUORIDE Rb 2KMoO 3F 3
Аннотация
In the work the complete Raman spectra of oxyfluoride Rb 2KMoO3F3 in the temperature range 7-260 K were obtained. The structural phase transition at T ~ 185 K was found. The lattice dynamics of disordered crystal was simulated, the calculated spectra contain the «soft» modes of oscillations.
Siberian Aerospace Journal. 2012;13(5):190-194
190-194
INFLUENCE OF CAPACITOR VOLTAGE MULTIPLIER ON ARC BURNING STABILITY IN THE CARBON DIOXIDE
Аннотация
During welding with forward and reverse polarity in carbon dioxide with wires of 1,2 mm diameter, formation of welded seams of of 12 amps or more , is provided. Spraying at the minimal voltages is not observed. Metal transfer in the arc without the explosive phenomena is fixed visually at currents 12-20 A.
Siberian Aerospace Journal. 2012;13(5):194-196
194-196
197-201
SYNTHESIS AND INVESTIGATION OF HIGH-QUALITY SINGLE CRYSTALS LA 075CA 025MNO 3
Аннотация
Growth modes of single crystals La 0i75Ca 0i23MnO 3 are developed with optical floating zone technique. X-ray, RFA, magnetization and resistivity studies performed on the crystals point out that high-quality single crystals are obtained.
Siberian Aerospace Journal. 2012;13(5):201-204
201-204
HARD MAGNETIC PLASMA-SPRAYED COVERINGS ON THE BASIS OF SM-CO ALLOYS
Аннотация
The authors describe a process ofproduction of hard magnetic coatings by plasma spraying method, based on Sm-Co alloys obtained by the electric arc method. The influence of technological parameters of spraying process and heat treatment on the structure and magnetic properties of the coatings is investigated.
Siberian Aerospace Journal. 2012;13(5):204-208
204-208
210-212
212-215
PUBLIC-PRIVATE PARTNERSHIP AS A STIMULATION MECHANISM OF INVESTMENT ACTIVITIES IN THE REGIONS OF SIBERIAN FEDERAL DISTRICT
Аннотация
The description of region legislation in Public-Private Partnership (PPP) is presented, the realized region PPP-projects are analyzed, problems and perspectives of development of Public-Private Partnership in Siberian regions are indicated.
Siberian Aerospace Journal. 2012;13(5):215-220
215-220
QUALITY ASSESMENT OF BUSINESS-PROCESSES OF UNIVERSITY STRATEGIC MANAGEMENT AT GLOBAL EDUCATIONAL COMPETITION
Аннотация
Connection between assessment of efficiency of strategy of innovative development of higher education institution in the conditions of competition in the world educational market and assessment of quality of business processes of strategic management of innovative development is established. Business processes of strategic management by innovative development of higher education institution are classified. Use of special analytical tools of assessment of quality of business processes of strategic management of innovative development of higher education institution is proved.
Siberian Aerospace Journal. 2012;13(5):221-226
221-226
STRATEGIC PLANNING OF MILITARY-INDUSTRIAL COMPLEX: MATRIX MODEL OF ECONOMIC POLICY DEVELOPMENT
Аннотация
The issues of economic policy-defense companies as a tool for strategic planning of defense enterprises are considered in the article. The classification of the factors of economic policy-defense enterprises is presented. Matrix model for economic policy development is suggested.
Siberian Aerospace Journal. 2012;13(5):227-232
227-232
232-238