Vedyakov_articles / Прибостроение.Статья

P. 30—36.

UTILIZATION OF HEAT AT CONTACT WELDING

A system of recycling of thermal energy emitted at contact welding is considered. Mathematical models of thermal processes are described, and quantitative estimations of thermal energy are obtained for various capacities on contact welding electrodes.

Keywords: contact welding, mathematical model, thermal processes.

P. 36—43.

THE GRAMIAN-BASED APPROACH TO ESTIMATION OF ENERGY EXPENDED IN CONTROL OVER CONTINUOUS SYSTEMS UNDER STATIONARY STOCHASTIC EFFECTS

The problem of estimation of energy expenditure in control over a continuous system is considered. The case of input stochastic action of the type of exponentially correlated noise is analyzed. Interpretation of stochastic system characteristics based on Gram matrix theory is presented. An algorithm is proposed for energy consumption estimating by control dispersion in relative numbers.

Keywords: stationary stochastic process, Gramian for energy expenditure, white noise, colored noise.

P. 44—48.

PRIORITY-BASED STRATEGIES OF TRAFFIC MANAGEMENT IN MULTISERVICE COMPUTER NETWORKS

Models and methods for investigation on characteristics of multiservice computer networks with prioritybased strategies of traffic management are considered. Fulfilment of QoS requirements by means of an appropriate choice of priority-based strategy is discussed.

Keywords: multiservice computer networks, priority-based management strategies, Quality of Service, heterogeneous traffic, model of functioning.

ИЗВ. ВУЗОВ. ПРИБОРОСТРОЕНИЕ. 2011. Т. 54, № 6

P. 49—55.

APPLICATION OF CHARACTERISTIC POLYNOMIALS OF M-SEQUENCES TO PSEUDORANDOM CODE SCALE CONSTRUCTION

The paper provides the characteristic polynomials construction method for M-sequences of the same span, via only one predefined polynomial. At the basement of the proposed method lies the usage of M-sequences’ decimation property and Berlekamp — Massey algorithm.

Keywords: characteristic polynomial, M-sequence, decimation, pseudo-random code scale.

Data on authors

Ilya D. Zakharov — Post-Graduate Student; St. Petersburg State University of Information Technologies, Mechanics and Optics; Department of Computing Technique;

E-mail: zakharov_ilya@hotmail.com

Alexander A. Ozhiganov — Dr. Techn. Sci., Professor; St. Petersburg State University of Information Technologies, Mechanics and Optics; Department of Computing Technique;

E-mail: ojiganov@mail.ifmo.ru

P. 56—59.

METHODS OF RECORD RETRIEVAL IN PRODUCTION SYSTEMS

A review of investigation lines and main results in inference engines design for production systems is presented. The problems under consideration include facts indexing and pre-selection, application of relational algebra methods for reasoning are presented, implementation of database management systems in Prolog environment.

Keywords: production systems, relational algebra, Prolog language.

Data on author

Igor A. Bessmertny — Cand. Techn. Sci.; St. Petersburg State University of Information Technologies, Mechanics and Optics; Department of Computing Technique;

E-mail: igor_bessmertny@hotmail.com

P. 59—65.

ANALYSIS OF TRIANGULAR DYNAMIC STRUCTURES

The problem of system effect is considered for structure of three elements bounded by dynamic relations.

Keywords: triadic structure, homeostat.

ИЗВ. ВУЗОВ. ПРИБОРОСТРОЕНИЕ. 2011. Т. 54, № 6

P. 66—74.

CARDAN-LESS INERTIAL ORIENTATION SYSTEM WITH ELECTROSTATIC GYROSCOPES FOR ORBITAL SPACESHIP

Results of development of cardan-less inertial orientation systems with electrostatic gyroscopes for orbital spaceships are reviewed. Construction of electrostatic gyroscope with solid rotor is described, and inertial system designed on the base of the gyroscope for orientation of space vehicles for remote sensing of the Earth is presented. The problem of system accuracy is considered, special features of software developed for the system are described. Some results of the system flight tests are demonstrated.

Keywords: electrostatic gyroscope, inertial system, orbital spaceship.

P. 75—80.

PRINCIPLE STAGES OF DEVELOPMENT OF DOMESTIC MICROMECHANICAL GYROSCOPES

Principle stages of theoretical investigations and practical developments of domestic micromechanical gyroscopes are reviewed. Achievements of Russian manufacturing companies and universities in creation of new generation of the sensors are described. Some peculiarities of the design accounting for specific character of applied materials and technologies are considered.

Keywords: micromechanical gyroscope, silicon, technology.

Data on author

Mikhail I. Evstifeev — Dr. Techn. Sci., Professor; Public Corporation TSNII Electropribor, St. Petersburg; Head of Department; E-mail: evstifeevm@mail.ru

P. 81—86.

PRECISION ELECTRIC DRIVE FOR OPTICAL SPACE CONTROL SYSTEMS

Requirements are formulated to accuracy characteristics of pointing systems for modern high-precision optical space control complexes. Main problems related to realization of tracking electric drives for the systems are discussed. Some approaches to development of energetic and informational subsystems of the drives are described.

Keywords: optical space control systems, tracking electric drive, support-rotating device.

Data on authors

Mikhail A. Sadovnikov — Dr. Techn. Sci.; Public Corporation “Scientific Production Corporation Precision In- strument-making Systems”, Moscow; Deputy General Designer;

E-mail: msadovnikov@gmail.com

ИЗВ. ВУЗОВ. ПРИБОРОСТРОЕНИЕ. 2011. Т. 54, № 6

P. 86—91.

SYNTHESIS OF LQG-CONTROLLER OF PRECISION TRACKING ELECTRIC DRIVE FOR TRAJECTORY MEASURING TELESCOPE AXIS

Synthesis of linear-quadratic-Gaussian (LQG) controller used in automatic system control of telescope axis precision tracking electric drive is considered. Application of LQG-controller is shown to afford higher accuracy of the system due to robustness to object process noise.

Key words: robust control, LQG-controller, high precision tracking electric drive.

P. 91—98.

MATHEMATICAL MODEL OF BRUSHLESS DIRECT CURRENT MOTOR OF TELESCOPE TURNTABLE

A mathematical (simulation) model is proposed for brushless direct current motor of telescope turntable. Stator windings of the motor are divided into three independent winding sections. Each winding zone is supplying from own inverter. These sections interact with a general permanent magnet rotor. Influence of stator windings asymmetry on motor static characteristics is studied.

Keywords: brushless DC-motor, divided stator winding, stator coil, elementary torque.

ИЗВ. ВУЗОВ. ПРИБОРОСТРОЕНИЕ. 2011. Т. 54, № 6