ISSN 0021-3454 (print version)
ISSN 2500-0381 (online version)
Summaries of the issue


On the example of synthesis of structure of two-level distributed system of collection and pro-cessing of information on technical condition of space vehicles in the course of their life cycle, a state-ment is given of the problem of formation of the information system target state. An approach to imple-mentation of the concept of functional-structural synthesis of complex systems based on solution of mul-ti-criteria discrete programming problem is used. Composition and dimensions of generalized vectors of structural parameters of the system and its elements are specified. Expressions for estimating the prob-lem dimensionality are presented. It is concluded that a special technique of reduced iteration of infor-mation system variants is necessary to be applied.
A theory of questionnaires is development in the direction of studying the questionnaires features with questions with equal number of outcomes (homogeneous questionnaires). A special attention is given to ternary questionnaires in which the questions have three outcomes. Such questionnaires may be used to solve a wide range of discrete search, identification, and technical diagnostics tasks. Com-pared to binary questionnaires, ternary questionnaires may turn out to be questionnaires with a much lower cost for identical sets of identifiable events. The advantage is considered as a significant one when maximum cost of the questionnaire is limited, e. g., in the tasks of technical diagnostics with limited time for diagnosis. The questionnaires in which the questions allow for occurrence of errors, and the answers – for uncertainties, are studied. Methods of constructing questionnaires with errors and uncertainties for the matrix form of the task are described, and specifics of optimization of such questionnaires are con-sidered.
ANALYSIS OF DYNAMIC SYSTEM PROPERTIES Bystrov Sergey V., Grigoriev Valeriy V., Mansurova Olga K., Petrov Vadim A., Ivan M. Pershin
The possibility of using recognized parametric relations between qualitative characteristics of dy-namic processes in analyzed system and its fundamental features (types of stability and instability) for development of effective techniques of the system function analysis in various conditions and for design of control devices – regulators providing the required performance quality is considered. For continuous and discrete dynamic systems, a unified approach to the analysis of their functioning properties is devel-oped. The analysis includes a procedure for constructing ellipsoidal estimates of the areas of dynamic processes behavior parameters and estimating permissible parameter changes under the conditions of qualitative exponential stability.


An indirect method of aircraft aerodynamic angles measuring with accelerometers and pressure sensors is presented. The peculiarity of the method is the application of measured flight parameters and structural characteristics of the aircraft to formulate equations for derivation of current values of attack and slip angles. Aircraft aerodynamic characteristics and calibration motor characteristics are used as design data. Equation of forces is formulated in the related coordinate system with subsequent projec-tion on the speed coordinate system. Solution to the nonlinear equation for attack angle is obtained using the chord method for calculation of approximate root to the equation with high precision sufficient for practical application. Slide angle is found from a linear equation solution. Simulation of three flight phases is performed and the iteration procedures of equation root evaluation are illustrated for takeoff climb, glideslope descent, and horizontal turn with the roll of 30 degrees.
PROTOTYPING DIGITAL SYSTEMS OF CONTROL OVER PACKET PIEZOAKTUATORS Boikov Vladimir I. , Bystrov Sergey V., Alexander A. Kulchitsky, Pavel V. Karev, Nguyễn Bá Huy, Andrey I. Smirnov
The questions of organization of a software and hardware complex for prototyping digital control systems of executive thin-film package piezoelectric actuators using MatLab Simulink are considered, characteristics of experimental complex are presented. The complex is built using the ACV demo stand by Cedrat Technologies with the piezoactuator APA-60SM and the STM32F4Discovery module by STMicroelectronics. Automatic generation of the program for the microcontroller is performed by means of the Waijung Blockset software library for working with STM32F4 microcontrollers. It is demonstrated experimentally that the software-hardware complex allows automating the studies of the control object dynamic characteristics and working out control algorithms for packaged piezoactuators in real time with full-scale samples.


The problem of software evaluation based on results of tests performed during its certification is considered. The formulated approach is based on relationship between criteria, factors, metrics and evaluated features of software and can be used in creation of a database of test results for different types of software. At the preliminary stage, it is advisable to analyze the formed sets, providing a check of the structural properties (observability, decomposability, aggregation) of the measuring complex of the test center (laboratory). The applied estimates of utility function can be used in express analysis of soft-ware products, as well as for formation of relevant databases of test units.
Based on a unified multi-model dynamic description, an approach is proposed which allows to solve simultaneously a set of problem of synthesis of modernization plans and functioning of a complex object. It is proposed to consider a complex object as a set of structures that have the property of struc-tural dynamics and interconnected by nodes that perform processing, transmission, and analysis of in-formation, as well as development of control actions. A set-theoretic formulation of the problem of man-agement of modernization and functioning of a complex object is presented. The proposed method makes it possible to synthesize a reference plan for solving the problems of modernization management and operation of complex objects and reasonably choose compromise solutions for multivariate solu-tions related to modernization management.


The problem of provision of basic indicators of quality of micro- and nanodevices at the design phase is considered; the indicators include characteristics of performance, reliability, and manufactura-bility. The group technologies used in manufacturing micro and nanodevices provide interrelation be-tween the parameters of a device formed in a single technological cycle, which imposes restrictions on the methods of ensuring serial suitability and reliability of micro-and nano instruments. The traditional design methodology does not allow to achieve an optimal combination of indicators of purpose, manu-facturability and reliability of the batch of devices. A new methodology is proposed for integrated design of micro - and nanodevices that within the group of production technology allows to achieve optimal combination of the above indicators in given conditions of production and reliability in the operation con-ditions under the given constraints on the parameters the device purpose. A stage of technological opti-mization is included in traditional scheme of the design process. As a result of the optimization, correc-tions for the nominal values of the device design parameters are determined, maximizing the target function. For the target function, the probability of finding the indicators of the purpose of the device with-in the limits of the imposed restrictions is taken, i.e. the probability of performing the specified functions during the operating time, or gamma-percent operating time to parametric failure. The proposed meth-odology is worked out on the examples of micro - and nanoelectronics devices, namely, a mixer and a rectifier of microwave radio signals with a resonant tunnel diode as a nonlinear element.
Resonant tunnel diodes (RTD) are promising elements for use in microwave and HF transceivers, in particular, in nonlinear frequency converters of radio signals. The use of RTD as nonlinear elements allows to improve the performance of the converters, as well as to expand the operating frequency range up to terahertz. The kinetics of RTD volt-ampere characteristic at specified operating conditions under the influence of high temperature and ionizing radiation is studied. Mathematical models describing degra-dation of the RTD volt-ampere characteristic under the effects are developed. The obtained models are used as a basis of a software package that allows to simulate the kinetics of RTD volt-ampere character-istic caused by the action of above factors. The simulation results are compared with experimental data.
Assembling of small-gear cylindrical gears is considered from the point of view of the require-ment to minimize the kinematic error in accordance with State Standards 9178-81 and 1643-81. A meth-od is proposed for calculating and minimizing the kinematic error of gears consisting of wheels with po-sition errors equal to the maximum permissible values specified by the GOST. Estimates of the kinemat-ic error are presented, recommendations for choosing the relative position of the gears in the process of gear assembly are formulated. The cases of assembly with multiple and non-multiple gear ratios are considered separately.