Omsk Scientific Bulletin

Optimization of the rotor of a magnetoelectric synchronous machine with pole tips shaped as elliptical arcs

2025-01-24T06:22:26+00:00

The article optimizes the rotor of a synchronous machine with tangentially magnetized magnets. The rotor pole tips have a shape resembling an arc of an ellipse. The simulation of the magnetic circuit of a synchronous machine is performed using the FEMM program. The optimization problem is solved using the coordinateby-coordinate descent method; for each coordinate axis, the minimum value of the objective function is determined by the dichotomy method. Permissible ranges of variation for the variable values, which define the dimensions of the rotor's structural elements, are considered as segment boundaries within the dichotomy method for each coordinate axis. The optimal size values of the permanent magnets and pole tips on the rotor, shaped as an elliptical arc for a four-pole machine, are calculated. The curves of the normal component of magnetic induction in the air gap of a synchronous machine with pole tips shaped as both a circular arc and an elliptical arc are compared. A mock-up of a four-pole electric machine with permanent magnets on the rotor is constructed, and the electromotive force curves of the stator winding at idle are obtained.

Informative value of online monitoring of turbo generator technical condition parameters compared to visual inspection

2025-04-02T10:09:05+00:00

Measurements of partial discharge amplitudes and spectral analysis of vibration at different times and often by different people are poorly informative, which are accepted in the practice of turbine generator diagnostics. The information content is much higher when both discharges and vibrations are measured at the same point, this allows you to see both the synergy of “vibration phenomena and discharges” and the reverse synergy of “discharges and vibration phenomena”. And the analysis of the distribution of the magnetic field over the surface of the generator housing makes it possible to identify the result of the “operation” of the discharges and vibration. To determine their effect on tires and current-carrying elements of turbo generators the paper provides practical examples of determining defect zones using this method and confirming them during visual and instrumental inspection during repairs.

Investigation of the environmental impact on the capacity of overhead power lines

2025-04-22T04:54:14+00:00

Due to the growing demand for electricity and the deterioration of existing infrastructure, overhead power lines in many cases are forced to operate at the limit of their thermal capabilities. This encourages engineers to increasingly pay attention to the consideration of weather factors affecting the temperature of conductors, using appropriate mathematical models. This makes it possible to quickly respond to changes in the thermal regime of the conductors. In this article, based on the equations of thermal balance, analytical expressions are derived for calculating the temperature of insulated and non-insulated wires of overhead power lines. The presented mathematical model is confirmed by comparison with the finite element method implemented in the Ansys software package. The study also included a comprehensive study of how ambient temperature, wind speed and atmospheric pressure affect the thermal state of the conductor.

Application of artificial neural networks for saturation correction in current and voltage transformers

2025-04-16T08:30:31+00:00

The article investigates the application of artificial neural networks for saturation correction in current and voltage transformers. Under saturation conditions, these transformers can distort signals, leading to the incorrect operation of measuring and protection devices. The use of artificial neural networks allows increasing accuracy in signal processing, thereby improving the reliability and safety of electric power systems. The paper describes methods for training neural networks using historical data, modeling transformer operation under various conditions, and developing algorithms for correcting distortions caused by saturation.

Study of elastoplastic deformations during static and dynamic interaction of two deformable solid bodies. Indenter with a conical tip

2025-01-31T15:19:09+00:00

The work analyzes the dynamic and static relationships between force and indentation depth when conical indenters are pressed into various materials. The indenter consists of a cylindrical body with a pointed conical tip. Indenters and targets are fabricated from steel, duralumin, and brass. Through digitization of graphs representing the investigated relationships, interpolation formulas describing the distribution of elastic and plastic deformation energies within the contact zone are derived. The obtained results can be applied in the design of dies and matrices for material forming processes, as well as in the determination of parameters for technological operations during the fabrication of profiled parts from steel and duralumin sheets.

Stamping of forgings with side outlets of tee-type in a split tool

2024-12-17T07:45:22+00:00

The article considers the options for analyzing design and technological solutions for hot volume stamping of tees in split dies on a double-action crank hot stamping press. The analysis technique is based on assessing the parameters of shaping with acceptable changes in the shape and size of the shaping tool engraving and the dimensions of the blanks. Modern research methods are used, accompanied by a technology design cycle from setting the initial conditions to creating a 3D model of stamped forgings and manufacturing the tool. The developed algorithm for designing the technology allows for simplifying and accelerating the process of preparing for the production of forgings. In conclusion, the factors that determine the possibilities of improving the quality of stamped products are presented, and directions for possible improvement of the technology for stamping forgings of parts with tee-type processes are proposed.

Bezier curve conjugation for smooth curve joining and corner rounding

2025-01-10T08:06:16+00:00

The authors propose an analytical method for the smooth connection of two Bezier curves of arbitrary degree using a connecting curve, which is also a Bezier curve. At the points of connection between the connecting curve and the original curves, the smoothness order corresponds to the degrees of the original curves. Additional constraints can be imposed on the connecting curve, which frequently arise when addressing practical design challenges. Theorems establishing the necessary conditions for the existence of the connecting curve are proven. The capabilities of the proposed method are demonstrated by solving two problems: the smooth connection of two initially given Bezier curves and the smooth rounding of an interior corner formed by intersecting initially given Bezier curves. The solution to the second problem enables both symmetric and asymmetric rounding of corners formed by the intersection of non-straight lines, while maintaining a high degree of smoothness at the connection points. The influence of additional constraints on the connecting curve's shape is shown.

The proposed mathematical method is based on solving a system of linear equations, where the equations represent the derivative equality conditions at the connection points and at the points where additional constraints are applied. Bezier curves are treated as special cases of B-splines. The proposed method is applicable to both 2D and 3D scenarios.

Methodology for calculating the fractional content of dust after cleaning in cyclone-type dust collectors and its post-cleaning

2025-04-17T04:52:28+00:00

The problem with using cyclone dust collectors is the insufficient degree of cleaning of small dusts. Therefore, it is necessary to introduce sequential post-cleaning to meet the requirements of the MAC. Usually, the calculation of the residual dust concentration is carried out on average, which does not give a complete picture of the fractional content of dust after cleaning and increased breakthrough of small fractions. This article presents a method for calculating the fractional residual dust concentration for its sequential post-cleaning using an electrostatic precipitator.

Modeling of the wire electrical discharge machining process using the finite element method

2025-01-14T21:28:05+00:00

The paper proposes a methodology for modeling of wire-cut electrical discharge machining processes by finite element method. The authors describe the main approaches to calculating thermal fields by analyzing the recast layer and phase transformations occurring during material processing. Moreover, the article considers the feasibility of using the model to predict the depth of the recast layer and the topography of the processed surface. The proposed methodology allows estimating the influence of machining parameters on the quality of titanium and zirconium alloy blanks. The methodology can be applied in aviation and space industry, medicine, shipbuilding and other industries where high precision machining of complex parts is required.

Analysis of quality management in digital production design and technological preparation

2025-03-21T10:29:48+00:00

The article is devoted to the analysis of the current state of quality management of design and technological training of digital productions. The main trends and challenges facing enterprises in the context of the transition to digital technologies are considered. The main attention is paid to the research of methods and tools used for quality management of design and technological preparation of production facilities, such as the introduction of PLM systems, the use of Industry 4.0 technologies. The groups of problems that arise during digitalization in the quality management of design and technological training of production are described. Promising research directions necessary for further development of the quality management level of design and technological preparation of production facilities have been identified.

Strategic mapping of iterative technology development based on modular analysis of modification quality indicators

2025-04-29T05:40:52+00:00

The article presents the results of the technical facilities development at the stages of the product life cycle. Using elementary development functions, a description of the transitional phases of modification in the process of existence is given. As a result of which, a conclusion is drawn about the inevitable obsolescence of the object as a result of the influence of natural factors. To offset the degradation of engineering facilities, it is necessary to initiate innovative processes aimed at adding value to the product. Innovation is based on a target vector or strategy that describes the operations and resources needed to achieve a planned result. To form a strategy for managing the development of a technological solution, it is proposed to use a modular method for analyzing quality indicators based on the study of situational, retrospective and predictive indicators described using three types of maps: innovation flow, technological gaps and frontiers. As a result of the construction of these maps, a comprehensive understanding is formed of the nature of technology improvement and the prospects for its development, implemented in several iterations.

HIL modeling of systems using the multipole filter

2025-06-20T08:59:18+00:00

The article proposes an interface (multipole filter) that provides stability of the semi-natural modelling of the initial systems when the fragments of the system are represented by N-poles connected with each other by high intensity loopback (HIL). Thus, the article considers a generalized radio-technical system as an initial system, which fragments are N-poles that exchange currents and voltages with each other at every simulation through the proposed interface (2xN-pole/filter). The stability analysis of the HIL modeling process is carried out by circuit theory methods and numerical methods of systems of linear algebraic equations solution. The method of the stabilizing filter parameters determination is demonstrated. At these parameters the filter is an ideal delay line, i.e. the amplitude-frequency response of the filter does not depend on frequency, and the phase-frequency response changes directly proportional to frequency with the proportionality coefficient as the delay time. The adequacy of the obtained theoretical results is illustrated by means of numerical modeling on threephase inverter parts. Moreover, the article assumes that since the filter, with the correct choice of parameters has unique characteristics, it is not only an ideal delay line, but also a pure delay filter, as its amplitude-frequency response is constant and equal to one, it would be called a multipole pure delay filter (mppd-filter).

Analysis of equipment for assessing radio product stability under external factors

2025-02-18T15:46:29+00:00

The development and manufacture of devices and products in the electrical, aviation, and military industries necessitate rigorous testing of finished products to ensure operability and the preservation of functional properties under various operating conditions. In the current environment, producing high-quality and reliable products is a primary objective for any manufacturing operation in Russia. Due to the departure of imported test equipment suppliers from the Russian market, domestic enterprises are compelled to seek alternative sources for the test equipment required to evaluate their products. This paper presents a comparative analysis of heat and humidity chambers from both domestic and foreign manufacturers. The problem is addressed through information analysis and data synthesis using a comparative methodology.