Vol 22, No 2 (2014)

Static and dynamic characteristics of the objects with delays in time are analyzed in the paper. Self-directing robust systems and algorithms of their direction with passive (signal) adaptation are provided. The static and dynamic characteristics of robust self-adapting systems with long time delay are studied. The system of algorithms, providing for the elimination of static mistakes involving constant beginning and revolting influences without use of integrated components in a basic contour of the system is suggested. It’s shown with the help of analytical procedures and by the method of computer modeling that the systems have a property of low sensibility to variations of the object’s parameters and revolting signal influences. At that the system remains stable and guarantees the necessary complex of system’s quality demands.

The problem of equipment designing for industrial water supply systems is analyzed. Objects of investigation are intakes and water treatment systems, providing water processes for set industries that are located in the area of ​​the region. The use of intelligent decision support system for water treatment technologies is described. As a result of such a system by a set of alternative-processing circuits that contain many different types of devices is formed. The problem of optimal selection of process equipment for the resulting technological schemes is considered. This is the problem of discrete programming with Boolean variables. Constraints of the problem take into account tolerances on values ​​of water quality, energy consumption and other process variables. Examples of the use of the proposed method for several industrial water systems are given.

The importance of accuracy and reliability of the systems of power accounting metering information is emphasized in the article. Various mathematical methods of bad data identification are examined. Position of the method relative to the state estimation is the basis for methods separation into different types. Special attention is paid to the a posteriori bad data analysis. Applying of energy flow problem to reveal measurements with errors which exceeds admissible limits is described. In contradiction to traditional state estimation, energy flow problem variables are flows of energy. Test case is calculated to demonstrate the efficiency of the method.

A brief analysis of methods for measuring the frequency on instant values of harmonic signals that reduce the measurement time is considered. A new method of measuring the frequency of the harmonic signals based on the formation of additional voltage signals and comparing the instantaneous values of the input and one of the additional signals is described. In order to determine the frequency is used the temporal separation of the instant values of an additional signal on the exemplary time interval. The block diagram of measurement tool that implement the methods is provided. The results of the analysis of the method’s error due to the deviation of the actual signal from the harmonic model are considered. The obtained results allow to identify exemplary intervals that will ensure reduction of error.

The addition of nano-sized particles of titanium carbide improves the mechanical properties of the alloys without degradation of the starting of the corrosion resistance. The relevance of the study of aluminum alloys and composite application of self-propagating high-temperature synthesis to produce alloys of Al-TiC is shown. Preparation process of the charge and a composite alloy is described. The results of studies of mechanical and corrosion properties of the composite alloys aluminum matrix modified nanoparticles of titanium carbide TiC are provided. Alloys compositions such as: Al - 10 % TiC, AK7 +10% TiC and AK9ch +10% TiC were studied, as well as the starting matrix materials: pure aluminum and AK9ch. The plasticity index wad obtained by calculation. This value showed that the experimental samples are small crystal materials and nanomaterials . It is shown that the addition of nano-sized particles of titanium carbide improves the mechanical properties of the alloys without degradation of the starting of the corrosion resistance.

The paper deals with the well-known methods for coating the inner surface of the pipe, and we propose a new method to improve the quality of pipe coating. Variation of the degree of opening of the valve height of the column of material applied for determining the control algorithm process draining material in the proposed method for coating the inner surface of the pipe is determined.

The possibility of outstripping superficial plastic deforming by hydroblasting influence on cylindrical parts of various diameters (10-40 mm) made of D16T alloy with circular cuts endurance limit evaluation using residual stresses (initial deformations) of reference specimen determination results has been examined. It’s established that the maximum calculated compressive residual stresses in smooth parts differ from the experimentally found ones less than 7%, in cut parts this difference is 8%. Endurance limit increments for parts with cuts have been defined using the average integral residual stresses criterion by calculation method. The difference between experimental and calculated values of hardened parts with concentrators endurance limit increase doesn’t exceed 17%.

The methods of assessing the residual life of the pipeline at presence of the outer or inner cracks oriented in the axial or circumferential direction. It is based on methods of interpolation polynomials and statistical tests. The method is realized in the form of a program, which is a Windows-based application with a modern user-friendly interface.

The problem of optimal planning for introduction of the automatic measuring system of technological parameters taking into account restrictions on funding of each phase is discussed. As a result of solving the problem it is achieved the maximum accuracy of the calculation of technical and economic indicators of equipment at each stage. The setting of the problem takes into account the current state of the measuring system for the calculation of technical and economic indicators, the measurement error of existing and newly installed devices, the cost of the introduced system, the cost of maintenance of the existing system and the new system. An example is given of solving the problem of optimizing for the phased introduction of the automatic measuring system for the calculation of technical and economic indicators of power-generating unit.

The computer and math model of HS Togliatti, that takes into account religie lengths and diameters of pipelines, elevation of arrangement of the equipment, the roughness of the pipe load in thermal cameras, etc., was constructed and it allows to determine speeds, costs and pressures of environment in all areas of the network at any point HS and also head loss and the cost of the power plant on the transport of coolant, considering it as a unified whole ramified hydraulic system, taking into consideration all of the relationship between its elements. According to the results on the model of research, recommendations were made for the development HS optimum modes operation, reconstruction and construction its new sites.

The oil-trunk pipeline is seen as object with distributed parameters (ODP). The dependence on time and coordinates of the flow velocity in the pipeline is seen as ODP controlled value. boundary-value problems of mathematical modeling of trunk pipelines for petroleum transportation is presented in the form of the linear differential equation of the second order, the right part of which contains discontinuous functions describing involvement programs pump units at oil booster stations. These functions act as internal concentrated control functions of ODP. The linear differential equation of the second order is presented in the form of an infinite system of ordinary differential equations of second order, for integration of which applied the method of green functions.

The technology applied to the tool surfaces filing detonation coatings that improve tool life significantly reduce the manufacturing cost per unit of output, as well as requiring much less manufacturing space. Hardcourt as an abrasive material has a higher corrosion resistance, wear resistance and red hardness than steel wool and a higher thermal stability than diamond files. It uses the natural property of detonation coatings in multilayer deposition to acquire a uniform solid grungy layer across the surface being treated. In the present method was first used by the primary effect of anisotropy to increase strength "teeth" of a file.

An algorithm for determining the fractal characteristics of multicomponent signals of GC analyzers is considered. Fractal index is used as an identifier fir multicomponent chromatographic signals. For specific multicomponent chromatogram based on the analysis of the fractal index changing over time the compliance of chromatogram to the specific class is concluded.