Vol 19, No 1 (2011)

The article refers to the problem of entrance lag effect compensation when identifying an active structure which is represented by consecutive connection of a linear dynamic nonlinear state and second linear dynamic elements. The problem is solved by adapting a known method of Hammerstein object identification. The paper presents several ways of mentioned adaptation.

The paper refers to the usage and building of individuals crossover and mutation operators in vector genetic programming. In article the analysis of various approaches and their efficiency for evolutionary synthesis of control systems is given.

By hierarchy consideration of multi-agent decision support system of the enterprises group a basic level is the bottom level of active elements of the system functioning in the heterogeneous market environment. In given article features of existing models of active elements are investigated and requirements to active elements the systems conducting to working out of new formal model are formulated.

The article examines syntactic and semantic structure of taxonomy-based natural language texts. In order to do this, texts vocabulary was analysed and connection between basic lexical structures and their meaning was determined. The analysis allows to construct a model of subjective knowledge about taxonomy described in the text. This model can be used for automated acquisition of taxonomic structure from the text describing it.

The paper refers to searching overloads in cargo support equipment of maritime ships by building the structure schemes of dynamic elements and defining their transfer function. Various factors influence on overload values is investigated

This article describes image processing before X-ray, reflecting the current state of the impact of the implantable component «LitAr» on damaged tissue. The proposed method allows to obtain a compressed form of an image with high resolution and thus to quantify the interaction between the implanted component of the surrounding tissue. We also show that the proposed method does not require large time consumption and is characterized by invariance with respect to the shift of data within the analyzed window.

The paper deals with efficient architecture of remote labs for real experiments. The conditions, which provide maximum flexibility robustness and controllability of such systems are evaluated.

The information technology for functioning performance characteristics evaluation of regional information systems (RIS) based on information and communication service-market simulation has been developed. As a RIS integral performance criterion the user satisfaction of information needs degree for the consideration is proposed. The user structure dynamics and regional information service-market development simulation models have been designed.

The method of physical modeling of multielectrode electro-capacity converters of multi-flow oil hydrometers is given. Experimental data that allow to optimize the choice of basic structural parameters of converters in various pipeline calibers is obtained.

The paper refers to parametric evaluation of a random process spectral power density based on building of a linear differential model of random process time series. To obtain stable results of parameter evaluation data smoothing is conducted. The algorithm scheme for desired parameters evaluation is presented

The mode of the annealing of forgings made of steels R6M5 and R6M5K5, which are implemented directly in the two-chamber kiln at the site of forging is proposed and first developed.

Complex of the finite cylinders discretely moving from an input to an output with one control action in the form of power of internal sources of heat is considered as subject to control. Transfer functions of object with the distributed parameters in relation to the concentrated control action and perturbations in the form of a stream of heat losses are found. The structural model of the distributed object is offered as a complex of the finite cylinders with general surface of contact at the end,, considering presence of a heat transfer from surfaces due to a difference of temperatures of bounding workpieces.

The method of achievable parameters evaluation of a high sensitivity measurement oscillator with negative capacity converter is presented. Evaluation of a wide-range of achievable parameters of a highly sensitive measurement of the oscillator with the negative capacitance converter.

The problem of increasing the dynamic accuracy of a closed loop automatic control system of precision revolving table is considered in this paper. Accuracy of positioning this device 2- 3// (arc second). Coordinate boring machine coordinate grinding machine, coordinate measuring machine are equipped with revolving table to implement complex motion trajectory of tool relative to piecel and to guarantee declared accuracy.

Two variants of construction of magnetic rotor suspension control system are considered. Transfer functions of closed-loop system are found and stability conditions are defined. Analytic expressions for calculation of regulators parameters are obtained

The paper presents the procedure of finding of transfer function of disc's temperature field as an object with distributed parameters. Definition of two-dimensional problem in polar coordinates is examined. Heat losses from disc's end surface are considered as a function of a heat current depending on surface temperature. Simulation of behavior of disc's thermal field is performed for a case of continuously active thermal sources.

This paper considers the task of searching for optimal control algorithm of internal heat sources in feed-back system for stabilization temperature field within aluminum plate. Method of method of subsequent approximation for finding coefficients of this algorithm is investigated.

The paper describes the methodology of developing a method for determining the water content and total content of metal microelements in petroleum or petroleum products in the flow of the pipeline. The theoretical basis of the method for determining the percentage of water content in petroleum, which is the measurement of dielectric permeability of the dehydrated and crude petroleum are presented. The method for identification of petroleum from fields is proposed.