Omsk scientific bulletin

Modern rotary-impact mechanisms for the destruction of solid and frozen soils have a bulky and complex design. The development of a method for improving the rotary-impact mechanism construction allows solving the problem of reducing the energy intensity of the soil destruction process. The algorithm of the geometrical parameters determination of the rotary-impact mechanism is scientifically substantiated on the basis of the modern technical solutions' analysis of drilling rigs and physical bases of the drilling tool interaction with the soils of various difficulty categories. An analytical method with the use of modern computer technology, fundamental provisions of theoretical mechanics and strength theory are applied in theoretical and experimental research. The scientific innovation of the research involves a theoretically and experimentally verified method of basic engineering parameters selection for a fundamentally new rotary-impact mechanism (patent No. 2232858 of the Russian Federation) depending on the drill bit types. The proposed method for evaluating the resistance features of structural elements allows determining the P value of the non-destruction force to provide a safe impact on the groove base during drilling tool operations.

To produce competitive products, enterprises must engage in research and development activities. This work involves numerous specific factors that significantly complicate the process of labor intensity assessment. Existing labor standardization methods, while potentially applicable for evaluating labor intensity, are not fully adapted for research and development activities. Therefore, it is advisable to develop dedicated stages for assessing the labor intensity of research and development activities, allowing for consideration of all unique factors relevant to these activities.

The article proposes a method for calculating rational parameters of wire electrical discharge machining of zirconium alloy E110 using a rotatable central composite design of the second order. The influence of key processing factors such as pulse duration, inter-pulse pause, and spark gap voltage on the thickness of the recast layer and machining time is examined. The feasibility of using regression models for predicting processing parameters and optimizing their values is demonstrated. The obtained results are applicable for enhancing the productivity and quality of machining complex parts in medical, aviation, and other industrial sectors.

The article considers an inner current control loop design for a grid inverter of the battery energy storage system. For this purpose, a well-known methodology of subordinate control system design is used. According to this methodology the controller coefficients can be determined based on analytical findings. This approach will help prevent indefiniteness during the practical implementation of the automatic control system of grid inverter. The aim of the work is to advancing efficiency of the electrical system of a drilling rig with a battery energy storage system under peak load conditions. The problem of analytical determination of the coefficients of regulators in the automatic control system of a grid inverter has been solved. The structure of the automatic regulation system has been proposed. The efficiency of the automatic control system for the grid inverter is verified by the numerical indicators of the transient process quality obtained in this article.

The effective use of solid oxide electrolysers is a promising solution for the energy sector and industry in general. Therefore, scientists all over the world are conducting research on improving the electrolysers' efficiency and reliability. In this paper, a mathematical model of the material balance for a solid oxide electrolyser is considered, which allows optimizing the operating parameters of existing equipment and newly designed equipment.

In particular, special attention is focused on studying the effect of the operating parameters of electrochemical plants of planar design during electrolysis on the composition of reaction products. The relation between the compositions of reagents at the inlet and products at the outlet is determined on the basis of calculated data for a planar solid oxide electrolyser using mathematical modeling in comparison with experimental data.

The article presents the formation of a mathematical model of the wear process and estimation of the residual resource of synchronous traction generator brushes.

The authors propose to consider the peculiarities of operation and technical condition of the brush assembly in calculating the residual resource of electric brushes. The data arrays collected by the on-board monitoring system are analysed and required parameters for determining the residual resource of electric brushes are identified. The article provides a mathematical model of wear intensity of the traction generator electric brushes. The authors present the experimental research plan for determining the mathematical model coefficients. There is a scheme of experimental installation for determining the residual resource of synchronous generator brushes. The authors obtain dependences of the residual resource value on the change of operating modes.

Simple and easy-to-use modern sensors are required to monitor the levels of electric field strength around high-voltage power equipment, power lines, substations. These sensors ensure safety and labour protection of power equipment maintenance personnel. Therefore, the development of electric field strength sensors is an important and urgent task. The article proposes one of the possible options for constructing such sensors. The sensor is a two-component spherical dual-type element. Twelve biangular spherical conductive electrodes are placed in isolation on the spherical conductive surface of the sensor. The electrodes serve to form the sensitive elements of four dual sensors: two on each coordinate axis. Moreover, the dimensions of the sensor sensitive elements affect its error caused by the inhomogeneity of the field. The dual spherical sensor has a variable error: not exceeding ± 1,1 % in the 0 £ a £ 1 entire spatial range, which corresponds to the d = R minimum distance to the field source. The error of the sensor is provided by reasonably selected angular dimensions of twelve bi-angular spherical electrodes of the a₀ = 90 º and b₀₁ = 30 º sensor basic. The sensor has three outputs on each coordinate axis, two corresponding to single sensors and one to a dual sensor. This type allows expanding the sensor's functional features.

The dual spherical sensor is used for control and measurement means of electric field parameters of industrial frequency in high-intensity zones.