The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The reducing of energy consumption for transportation and manipulation of industrial objects is a topical issue. The objects of manipulation are gripped with the use of industrial robot and transported from one position to another. In gripping devices, the lifting force is created on the basis of the aerodynamic effect of lifting appearing due to the use of compressed air. The efficiency of functioning...
The research is aimed at investigating methods of forming a model for the system of adaptive control for drilling with a control object identifier. Under rapidly changing conditions of borehole drilling it is expedient to apply a strategy of the two-level adaptive control, which implies simultaneous drilling investigation and control. The subsystem of prediction is implemented on the basis of an adaptive...
Energy balance of electromechanical converter of a multi-module structure with a common hollow massive rotor has been considered. Design capacity for the motor module is chosen based on the sum of thermal and mechanical output. For the brake module operating in the mode of opposition circuit only thermal mechanical output can be chosen. These capacities are determined by preliminary thermal and hydrodynamic...
In modern transport industry there is a tendency for electric vehicles with independent power supply to increase their amount, particularly it seems to appear in the fast development of electric cars. Nevertheless, there are still some flaws in electric vehicle drives to be improved. The element of an electric drive that limits the performance of the vehicle is almost always power supply. Li-Ion accumulators,...
It is suggested to use the topological task for select the placement of distributed generation source. A topological task can not be solved by methods of functional analysis, because it is a problem with variable parameters. The algorithm of modeling for solving the topological task is proposed. The solution of the topological problem is significantly influenced by the parametric features of the object,...
Electricity, which is transmitted to the distribution network, requires approval of its parameters and quality control. The presence of photovoltaic power stations (PPS) in the network affects its parameters and, consequently, the electrotechnical equipment, relay protection and automation systems, electricity metering devices (meters), power system's reliability. The objects of research are voltage...
This paper presents guidelines for passive components design of single-stage buck-boost inverter with unfolding circuit. This inverter has low number of passive components and it is intended for application where a wide input regulation range is required. All theoretical statements are confirmed by simulation results.
Phase compounding excitation systems of synchronous generators (SG) allow improving the voltage control quality under sharp load variations, and under short circuit on SG output. However, applying classical methods of automatic control theory and simplified linear models of the circuits for synthesizing automatic excitation regulators of these systems provides an optimum operation of SG only in the...
The FOTF toolbox for MATLAB is proposed for research of fractional control systems in this article. For the technical realization of fractional controllers, it is proposed to approximate the transition functions by difference equations. For this purpose, the method of z-transform is used with the discrete integrator approximations. Telescope control system was use as the testing object of investigation...
The paper substantiates the concept of building a three-phase model of the arc furnace in the instantaneous coordinates. The computer Simulink model of the electric mode of the electric arc furnace was developed. The results of testing the developed model are presented, the analysis of which shows that the required precision of the match between the experimental and simulated processes of regulating...
In this paper, analysis of features of some objective indicators of the audio signals quality, such as the segmental signal-to-noise ratio, log-spectral distortions and bark-spectral distortions, for estimating the quality of musical signals with a limited frequency band has been presented. Obtained results of objective evaluation are compared with the quality assessments obtained by subjective testing.
This article describes a method for recognizing Ukrainian car's license plates of the most common format, which has a high percentage of correct recognition and applied in practice.
The article describes a method for recognizing the type of a fault from the analysis of gases dissolved in oil. In order to take into account the drift of the values of the coordinates of the graphic images, it is suggested to use not reference images, but reference areas that are built according to the results of DGA, equipment with the same type of defect. Standard areas for 56 faults were constructed,...
Deep learning (deep structured learning, hierarchical learning or deep machine learning) is a branch of machine learning based on a set of algorithms that attempt to model high-level abstractions in data by using multiple processing layers with complex structures or otherwise composed of multiple non-linear transformations. In this paper, we present the results of testing neural networks architectures...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.