Vol 20, No 4 (2012)

Organizational structures of the vertically integrated telecommunication enterprises are considered. Expediency of reorganization of JSC Rostelecom, and creation of two federal branches is shown: «multinetwork» and «multiservice»

The paper is the analysis of self-adapting control algorithms that provide the elimination of static errors in linear systems as well as symmetry of self-oscillations towards the demanded points in non-linear self-oscillating systems with nonsymmetric restrictions to control actions and with permanent perturbances.

The problem of identification of the spatiotemporal function of internal heat sources in the inverse thermal conductivity problem is solved. Representation of the control action is based on the modal description in the form of the infinite expansion in terms of orthogonal system of eigenfunctions; the coefficients of this series are temporary modes. Searching for the desired control is reduced to the independent identification of restricted set of temporary modes, linear combination of which provides the approximation of the specified temperature state.

The problem of optimal time control systems synthesis with interval of incompletely characteristics of the object models with distributed parameters is considered. Synthesis of optimal controller of induction heating process was performed and structure identifier parameters of characteristic control object was proposed.

The paper deals with the problems of ensuring the complete raw material processing in terms of its preliminarily placing at the purveyance stage. The paper gives the theoretical substantiation of the strategy of rational placing of incoming raw material batches at the plant storage facility. The paper also suggests methods of optimal selection of save place for every raw material batch based on this strategy.

The issue of modeling and analysis of criterion sets of portfolio management quality assessments is considered. The various risk criteria are investigated. The analysis is carried out for portfolio models with Markowitz's and Black's constraints, and also the Russian legislation constraints for qualified and non-qualified investors.

The method of constructing the inverse digital filters for solving inverse problems of reconstruction of signals based on an approximation approach. The criterion used criterion of moments.

Updating of a measuring circuit is offered at realization of a method of measurement of parameters of capacitor gauges. Results of the analysis of an error of the method caused by a deviation of real transient from incorporated in model are resulted.

A new method for determining crack toughness of materials is described based on test data of small-size chevron-notched specimens in terms of commercial titanium BT1-0 and titanium alloy BT6 with ultra-fine grain (UFG) structure, obtained by methods of severe plastic deformation (SPD). A problem of separating a part, connected with variations in specimen ductility under crack propagation, of the total displacement of load application point, is solved. Equations to calculate specific fracture energy are obtained. The calculated values of stress intensity factor K Ic are in good agreement with known test data of standard specimens.

Discusses the method of determining the angular accuracy of profile joints with gaps and transitional plantings. Identifies areas requiring special profile control of precision in manufacture. Influence of errors of the profile on the angular precision of the connection.

The paper deals with the problem of mathematical modeling and analysis of quasi-stationary processes in multicircuit overhead power transmission line in a field setting. The paper lists the analytical expressions for determining the components of strength vectors of the magnetic and electric fields at every point.

The paper performs the research of electromagnetic and thermal fields in the induction system for the plastics production. The paper also lists the results of calculations based on the numerical model. Mathematical model of the induction heater is developed in order to solve the problem of designing the induction systems for injection molding machine

The structural diagram of the servo drive with the synchronous motor is developed, allowing to increase its response time. Analytical expressions for calculation of parameters of the regulators providing the unidirectional approach to the set coordinate in a combination with small time of transients are received.

The paper consider computation of electric field s and parameters multielectrode electro-capacity converters moisture meters of oil in the cross – through-flow sensing. The analytical expressions for the potentials and the components of the electric field in the control zone are obtained.

This paper describes the search for the optimal control action on a mixture of wood in the manufacture wall beam from woody organic waste. The application of the maximum principle, which measures the value of the control actions U for wood blend as best for speed and at the same time providing the greatest stability region.

The method of measurement of integrated characteristics on instant values with use of orthogonal making harmonious signals is investigated. Results of the analysis of an error of the method caused by a deviation of a real signal from harmonious model are resulted.

Classification of methods of measurement of integrated characteristics by instant values with use of orthogonal harmonious signals is considered. The new approach to the synthesis of such methods is offered. Four methods synthesized on the basis of the given approach are examined.