Vol 21, No 1 (2013)

Questions of industrial technologies formalization are considered. The equivalent circuits of some physicochemical processes are offered.

The problem of controller design for continuous-discrete object is solved. A set of rules of the regulator is synthesized. Numerical-analytical procedure is used for this purpose. It is based on the joint application of finite-dimensional optimization methods for the determination of the conditional part of each of the rules as a logical expression of temporal logic and on sufficient optimality conditions for the analytical procedure of searching for each of time intervals of the control law with full feedback.

The main results of the study of automation prepress publications issues and the attempt to expose the use of the mathematical theory of decision-making in the planning practice of publishing activities are presented. The algorithm of the information system for further use in the software product «Automated executive secretary» (AES) is developed.

Results of the analysis of the measuring device error of integrated characteristics of the harmonious signals, using formation of additional signals with the help of the phase-shifting block are given. The received analytical expressions and diagrams of the error allow to choose optimum parameters of measuring process and a phase corner shift of the phase-shifting block providing reduction of the given error kind .

The paper discusses and classifies different approaches for sentiment analysis, shows its implementation for solving a problem of optimizing online advertisements and gives practical recommendations for SA setup depending on problem domain specifics, task requirements and languages of documents.

Calculation and quantitative evaluation of thermal conductivity and surface medium integral temperatures of multi-layer composite SHS pressed cathodes for deposition of vacuum-arc coatings were presented. Thermal conductivity of multilayer SHS cathode in TiC 0,5-Al and TiC 0,5-Al-Si systems is more than thermal conductivity of titanium cathode. However, due to the higher current of the arc temperature of SHS cathodes is approximately equal to the temperature of titanium cathode. It was found that the main factor determining the content of micro droplets phase of vacuum arc coatings is the fusion temperature of the evaporated cathode material.

The analysis of models describing the stick mechanism of elastic bodies at Coulomb friction at cyclic loading is done. The factors having a significant impact on the onset of full and partial shakedown in frictional contact are described. The results of numerical modeling of the fields slip and stick in conjugate cell assembly at cyclic loading at the example of cloves in cone drill bit are presented.

The influence of technological pre-tension of fibers, panel thickness, orientation angles of composite layers and volume fraction of fibers and resin on the forming of multilayered panels done of composite materials is considered. The validation of the developed mathematical model was made by comparing the theoretical and experimental results.

In article the results of application of Modal Assurance Criterion method for estimating experimental and calculated natural frequencies conformity, gained for a product «Souyz 2-1B», are presented. Calculations are carried out through FEM in ANSYS.

The influence of degradation processes as a result of continuous operation, and severe plastic deformation (SPD) on the change of structure, the crystal lattice parameter and the dislocation density in the pipe steel VSt3sp is considered. The long-term operation of the pipe contributes to the development of degradation processes in the crystal structure and modifies the mechanical properties of the material is shown.

The optimal conditions of use perspective type of the correction tool are submitted.

The specificity of digital control hydraulic actuators consisting of rigid requirements for accuracy, speed, reliability, technological consistency, overall and widespread and economic parameters of elements and the automation devices is considred. A method of reproduction of complex functional relationships, the essence of which lies in the spline approximation of a signal using as a criterion for approximation of the curvature and the lengths of arcs approximable plane curves and basis splines with a focus on graph-analytic realization is offered.

The approach for deriving refined mathematical model of electromagnetic transmission in cell power systems in the form of electromagnetic interference and lightning impulse quasi surge is developed.

The system of ordinary differential equations equivalent to one-dimensional thermal conductivity equation with boundary conditions of the first kind is derived which is oriented to solve the tasks in the field of complex systems control. Comparative appraisal of the accuracy of the approximation task solutions is given for the different methods applied with few elements partition of the heated body.

The process model of making three-dimensional parts by deep drawing has been investigated. The block Diagram has been elaborated as the object of the automatic control system.

The problem of an automatic measurement of the size of dead zone of the backlash in kinematical chain of the jig boring machine is considered in this paper. Algorithm of automatic measurement and functional scheme of this system are given.

Now ΣΔ-ADC are the de facto standard in the construction of high-precision measuring systems, but to achieve these characteristics often do not address specific applications. In work the analysis the shortcomings of the main ways to increase the accuracy of ΣΔ-ADC, from the point of view of their use in products for critical applications.