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The paper studies comparative characteristics of the solenoid coil windings, which make assertions about the uniformity and intensity of the magnetic field. In addition, an effect of the solenoid inductance of the coaxial magnetoplasma accelerator on the contribution of the kinetic energy in the initial energy of the system for two different models was considered. The coaxial magnetoplasma accelerator,...
The paper provides a method for assessment method of functionality of electrodynamic destruction of ice on power lines. The mathematical model of oscillations of wire under the action of a periodic force of Ampere has been developed. Based on a mathematical model of a numerical experiment, research of the electrodynamic method was performed. The results of the mathematical model are presented. The...
The problem of approximating the complex-valued function modulus using a minimax criterion is of interest in many technical applications, such as standard process controlling systems with limiting the transient oscillations, low-side-lobe antenna arrays, or multiplexing devices having a deep channel isolation. The paper introduces approximate formulas to compute the absolute value of a complex number...
The article provides the properties of the family of sum codes with on-data bits and one weighted data bit concerning the error detection in data vectors. In comparison with classic Berger codes, the described weighted and modular weighted sum codes have improved error detection characteristics. Also, weighted sum codes, as well as Berger codes, detect any unidirectional errors in data vectors, and...
The article is devoted to the modeling of multiarc welding in ESI SYSWELD. Functionality of the program allows modelling MMA, MIG, MAG welding processes, submerged arc welding, multi-pass and hybrid welding. However, there is no mathematical model for multiarc welding. The use of multi-pass welding does not reflect the physical essence of the multiarc welding, because the bead joints in multipass...
This paper describes the criterion of the end of the transient in the measuring circuit. The circuit model is represented by a dynamic element of the first order. The standardized interval criterion that is characterized as an empirical one is shown to be widely used in the digital measuring devices such as power transformer winding resistance meters. The dependence of the critical value of the maximum...
The paper presents the experimental results of performance evaluation of two types of arc suppression reactors (ASRs): traditional (plunger-type) and magnetically controlled (MC-type) one. The aperiodic component in reactor current is observed and its influence on reactors response speed is analyzed. It is shown that the delay in complete capacitive earth-fault current compensation is determined mostly...
The paper presents the results of simulation and study of operating modes of a photovoltaic power plant with the maximum power point tracking controller. A number of search methods are considered: constant voltage method, open voltage method, short circuit method, method of observing perturbations and incremental conductance method. A complex model of the photovoltaic power plant with the controller...
The work proves relevance of developing calculation methods to find equilibrium concentrations of aggressive gases in condensate during operation of heat exchange apparatus. It lists main reasons for high content of dissolved corrosive gases in the condensate. The authors propose their own methods for determining equilibrium concentrations of gases in condensate based on Henry's Law. The methods for...
The paper presents theoretical aspects of calculation of the efficiency of air cleaning electrostatic filter (ESF) used for removal of fine-dispersed dust, depending on the design of systems of collecting electrodes and their materials. The obtained analytical expressions for the calculation of the degree of cleaning, allow determining constructive and technological parameters providing the required...
The authors propose a new method of supplementing the common methods of decision making, in which possibility of overload element (s) of electric power systems will be relevant to making decisions on the admissibility of the regime not only in the event of a special regime that the authors call the regime of cascade failures. This method may be cost effective at taking management decisions when designing...
To optimize the network structure and main equipment composition, the problem of choosing the most effective decisions is solved at the stage of engineering project development for the various power supply system reconstruction. This problem occurs frequently when the distributed generation equipment installation and modification are planned for power supply systems of industrial enterprises. The...
Seabed conditions, which are characterized by low bearing ability of ground and rough terrain, often make traditional types of movers inefficient. Walking machines are better for bottom works; they differ in extremely high ground and shape passableness. In underwater conditions, there are certain features of walking mover interaction with ground. In particular, there is “compression effect” on low...
This paper presents the hypersynchronous converter cascade with intermediate DC-link scheme and one of the easiest and most reliable ways to control valves dependent on the rotary transducer rotor flux current. The equations explaining the regulation principle and the basic expression for calculating the hypersynchronous converter cascade static characteristics are presented. The design and control...
Detailed analysis of transients when switching channels of switch contact held and dependences of mutual influence of channels on the signal frequency parasitic capacitance and conductance of the active component of open switch channels is introduced. Recommendations on magneto controllable contacts matrix management providing the required level of reliability, performance and accuracy of measurement...
Today, modern power systems increasingly use new managed funds for the formation of regions (power cluster) with an intelligent power system and active-adaptive networks. The operating personnel of major nodal substations and network operations centers has to perform a whole range of tasks for power cluster management equipment to maintain the desired voltage level, to minimize losses and ensure the...
This article is focuses on the integrated analysis of the condition of technogenic safety of territory for information support of decision-making at different levels of management. The classification of the territorial system's objects, based on a classification scale with overlapping classes of condition is offered. Use of statistical indexes calculated on the basis of the classification task solution...
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