Home – Home – Jornals – Advanced Search

The paper considers the problem of control of movable objects with distrib-uted parameters, optimal according to standard quality criteria, concerning the actual goal of optimization of the operational temperature modes for continuous process instal-lations for preheating semi-finished products before subsequent pressure treatment. The solution to the problem provides the optimal energy consumption distributions of the heat sources' power along over the length of the heater in stationary modes of its operation, which act as the desired design solutions for the installation. Algorithms for automatic programmed and positional control of operational transient modes of a heating installa-tion are proposed that are optimal in terms of a standard quadratic quality criterion under conditions of a given accuracy of uniform approximation of the final spatial temperature distribution to the required one. The procedure for synthesizing an optimal controller is reduced to constructing a control system with linear feedback based on incomplete measurements of the object's state with non-stationary transmission coefficients determined by a preliminary calculation of programmed control.

To solve the problem of compensation of the influence of a perturbation on the angular position of the spacecraft, an engineering technique is proposed for the synthesis of an algorithm for controlling the flywheel orientation and stabilization system, based on ensuring selective invariance of the control system and the anti-accumulation signal scheme. The effectiveness of the method is confirmed by numerical modeling.

To solve the problem of estimating the orientation and position of an aircraft, a system based on series-connected Kalman filters is proposed: a linear Kalman filter in the attitude stabilization loop and an extended Kalman filter in the subsystem of maintaining the target location. The effectiveness of the developed control system is confirmed by experimental results of the quadrocopter indoor flight control.

The problem of monitoring the metal particles of friction pairs’ wear in lubrication systems of power plants is considered. The solution is proposed on the base of a multi-channel cluster eddy current sensor with single-coil sensitive elements. The sensor is installed in the oil pipeline break and provides the identification of ferromagnetic and non-ferromagnetic metal particles, as well as their ranking by several size groups. The features of the conversion of sensing elements’ inductances in differential measuring circuits during the movement of metal particles through the oil channel of the sensor are considered. The effect of the particles’ speed in the oil flow on the result of the conversion of sensor signals is analyzed. The algorithm for recognizing and assigning metal particles to specified size groups is given. Considering the possible effect of the particles’ speed on the result of the conversion of sensor signals, the operational correctness of the algorithm is evaluated.

The problem of estimation of the force loading channel gain of the electrohydraulic strength test bench is considered, in particular, on the basis of the frequency response analysis, the gradient method, the least squares method with sliding window, and the recursive least squares method with forgetting factor and based on the harmonic analysis. The calculation relations of the algorithms for obtaining an estimate of the force loading channel gain are given, the results of implementation of these methods on the experimental bench are presented, and a comparison of the estimates obtained by different methods is performed. As a result of the conducted research, recommendations are given for building an adaptive control system with the force loading channel coefficient identification loop on the aircraft structures strength test stand. The obtained results make it possible to automate the process of regulators’ adjustment for electric hydraulic actuators of the stand and to speed up the process of strength and fatigue strength tests of aircraft structures.

Solving problems of environmental monitoring reasonably requires collecting, digitizing, storing, and analyzing a large amount of spatiotemporal data. Data processing often needs distributed computing. As a rule, there are no means to fully support such computing in the well-known geographic information systems. In the paper, we propose an approach to solving this problem based on integrating a geographic information system with tools for developing and using distributed scientific applications in a heterogeneous computing environment through representing applied software as web data processing services. We show the advantages of the proposed approach in reducing the complexity of preparing and carrying out experiments with geodata.

The problem of improving the synchronization accuracy of three-phase voltages of an autonomous four-wire inverter with a network is considered. Increasing the synchronization accuracy is achieved by applying a proportional-integral-differential (PID) resonant controller. A new structure of the PID resonant controller and a methodology for calculating its parameters are proposed. The peculiarity of the proposed approach consists in the application of the time-scale separation method, which makes it possible to calculate the PID-component of the controller regardless of the choice of the parameters of its resonant components. Application of this approach to the calculation of the controller of autonomous voltage inverters makes it possible to improve electromagnetic compatibility and reduce losses in distributed power generation systems. The results of numerical simulation are presented.

The manmade acoustic signal properties are determined for rock mass monitoring aimed to predict main roof subsidence in coal longwalls. The limit properties for the automatic problem algorithm are defined. The dynamics of the informative parameters of a manmade acoustic signal is demonstrated as a case-study of the main roof subsidence areas in longwalls in Yalevsky Mine, Kirov Mine and Komsomolets Mine. The parameter stability of the integral resonance frequency energy at different distances from a setup room lengthwise an extraction panel is studied in three longwalls in coal mines of SUEK-Kuzbass in order to find correlation between relative stresses and intensity of interlaminar strains. The proposed and proven prognostic parameter enables timing of main roof subsidence and evaluation of the process dynamics.

Gas and dust clouding after large-scale blasting at Sitovo Quarry in the Lipetsk Region and the resultant pollution of the neighborhoods of the nearest towns is studied. The concentrations of solid particles less than 2.5 µm in size are determined in real time using modern equipment. The electronic filming of a large-scale blast and the dust cloud transfer with the wind within the limits of the quarry allowed considering a theoretical partial problem on propagation of fine-dispersion dust from the upper portion of the cloud from a height of 50-100 m to the recording points on ground surface beyond the quarry limits. The methods of computational fluid dynamics are used to model flow at the bottom of the atmospheric boundary layer disturbed by the wind interaction with the quarry topography. It is shown that turbulent diffusion ensures vertical dispersion of micro particles down to the recording points. An explanation is proposed for the revealed non-monotonic maximal concentration of dust over ground surface with an increasing distance from the quarry.

The new dust suppression method using chemical agents has been developed, patented and put in use in some surface and underground mines in Kuzbass, in the Novosibirsk Region and in Khakassia. As compared with the known solutions, this method allows enhancing efficiency of dust suppression in combination with extra effect of decreased freezing of coal during transportation.