Vol 19, No 4 (2011)

In the article authors suggest adaptive algorithm in relay system with variable hysteresis, which provides oscillation amplitude stabilization and symmetry relative to given set point in the conditions of assymetrical restriction on a control and permanent perturbations.

In this paper we propose a method to solve an optimal control problem with fuzzy targets and constraints. The decision as system of rules of a program regulator is estimated by minimax criterion and developed to satisfy the target function and the constraints.

The paper investigates the problem of integration of heterogeneous knowledge in computer-based modeling of complex systems. For solving this problem, it is proposed to use ontology-based approach, which implements in technological terms the common experience of determining the composition and interrelations of main stages of the process of real world modeling and analysis. The paper proposes and analyses the elements of the modeling environment, which act as various pieces of knowledge, all the possible variants of multimodel structures, arising from solving practical tasks, principles of controlling heterogeneous elements of modeling environment, conceptual metamodels for description and interaction of modeling environment elements.

It is considered the principle of action of the information-measuring system of the quantitative content of the impurities present in the flow of oil. The errors caused by the change of the velocity of propagation of acoustic waves and the uneven distribution of the speed of movement of the partial flow of oil.

The problems of algorithmization of normalization process for metrological characteristics of technical means of timekeeping are discussed in this article. An algorithm is presented. The algorithm allows to determine the number of metrological characteristics of technical means of timekeeping to be normalized and to establish appropriate allowances for them to ensure saving of metrological characteristics error settings on a given confidence probability level.

A method is presented for production biocompatible porous materials on the base titanium by SHS process using additives increasing the exothermicity of the initial charge. The microstructure, chemical and phase compositions are investigated, as well as the main characteristics of strength and porosity of the synthesized porous material. Results of investigation on the biocompatibility are show.

The calculation of the detonation characteristics of 1,3,5-triazine derivatives was made. On the basis of the offered calculation methods for the relative abutment tossing of the plate and the widening speed of the cylindric confinement the optimal substances for tossing the elements made of copper and brass were defined.

The article presets basics and first results of implementation of the accounting algorithm for partial failures for computing of structural reliability of electrical networks. Application of the steady state mode computing of structural reliability indices computing allows to make more exact estimation of structural properties of the considered electrical network, that allows to define more precisely a damage from an energy undersupply. In the attempt to make offered algorithm suitable for big dimension systems, it is necessary to receive quickly a power flow estimation in a network. In this case estimated methods and the models forge, that allow to receive the decision with some error, but with small estimated time and with small expenses for preliminary processing of the initial data.

In article calculation of influence of the static bending torque of the axial electromagnetic bearing for work of radial bearings at unilateral angular displacement of a rotor is presented. Calculating formulas for definition of reactions of radial bearings for bending torque are presented. Recommendations about decrease in the destabilizing bending torque are made.

A problem of synthesis of modal control system of an object with the distributed parameters is considered. An induction heater of an oil flow is used as a control plant. There are taking into account restrictions of spatial configuration of heat sources. A problem of temperature maintenance in the heater wall at maximum allowable level is solved. The oil flow temperature distribution is considered as a disturbance. Simulation results of created system are mentioned.

This paper considers the problem of searching for optimal control algorithm by internal heat sources in feed-back system for stabilization of temperature field within the volume of heated aluminum billet. The problem is solved by using dynamic programming method and finite integral transform method.

In this work there are represented the results of the determination of the group composition and individual sulfur-containing compounds of delayed carbonization of the 21-10/5К OJSC Novokuibyshevsk Refinery complex.

The results of studies aimed at creating a shaped charge for perforation wells with increased penetration in the shape lining which is different from classical axisymmetric. The design of shaped charges to ensure the creation of perforating channels with a larger size inlet opening area and volume. It is shown that the increased efficiency of the cone-linear and lengthened shaped charges, and charges with combined and multi-layer lining.

The simplified way of solving of a thermal problem of heating of contact system of the switch taking into account phase transition is considered

The algorithm and structure of system of automatic correction of a compounding of a cellular-concrete mix is offered. They are based on the analysis of a dynamic error distemper-rounds of a mix concerning reference process of a thermal emission.

The iterative procedure of synthesis control system based on shape of transient process is suggested. The quality of control system is checked for each iteration by simulation of hybrid system.

Formation of an optimum portfolio of technical decisions at creation of high technology production is considered. There are three statements of a problem of optimization with various criterion functions and restrictions: the maximum value of the project, the minimum cost price, the minimum quantity of resources.

A methodology is proposed for optimal water baths design and design of technological modes for cooling of cable production manufactured by extrusion lines, providing guaranteed achievement of the end product specified conditions accuracy.