Вестник УГАТУ

Possibility of using a penetrator to explore the planet Venus

2025-04-03T12:35:33+00:00

The planet Venus has specific conditions for the operation of research vehicles on it – a dense and “aggressive” atmosphere, high temperature and pressure, and strong winds. A penetra tor as a technical means of research is a tool for collecting primary scientific information about the physical and chemical composition of the soil, studying seismic activity and climate, which will help in the best way to explore the soil of Venus. The possibility of using a penetrator for the study of Venus was shown, an analysis of existing projects on this topic was carried out, a prototype was selected on the basis of which it is possible to simulate a ballistic descent in the atmosphere - this is the Mars-96 project, which included two penetrators. A mathematical model of the motion of the penetrator probe in the atmosphere of Venus has been compiled, using which evaluation calcula- tions of the prototype with various mass-dimensional characteristics, as well as for different diame- ters of the inflatable braking device and without it, have been carried out.

Optimization of Return Channels of Centrifugal Compressor Stages Using IOSO

2024-02-16T07:04:53+00:00

In this work, a multi-criteria optimization of the return channel with a return channel blades was carried out taking into account the parameter fields behind the first stage of a centrifugal compressor. The methodology of direct optimization calculations in IOSO software for return channels has been developed. According to the results of multi-criteria optimization, a Paretto-multiplicity of solutions for the pressure recovery ratio and flow irregularity at the outlet has been obtained, from which the optimum point with the maximum value of pressure recovery ratio has been selected. CFD calculation of the optimized return channel with the first stage of a centrifugal compressor was performed, according to the results of which the increase in the pressure recovery ratio of the return channel was 5.5%.

Problems of using alternative types of aviation fuel with a reduced carbon footprint on advanced aircraft for regional aviation

2024-11-22T07:44:19+00:00

In regional aviation in accordance with Russia's low-carbon development strategy, it is planned to introduce technologies for using more ecological alternative types of aviation fuel. At the same time, the aviation industry ensures transport accessibility throughout the country and requires an assessment of the effects of decarbonization on the economic efficiency of air transportation. The features of the use of aviation condensed fuel ACF, petroleum-based low life cycle emissions fuel LCAF and aviation fuel from renewable sources SAF are shown. The possibility of using a particular type of fuel is related to its production process and the availability of raw materials. The main provisions of the methodology for environmental and economic assessment of the efficiency of the use of various types of alternative aviation fuels for advanced regional aircraft, including in order to fulfillment obligations to reduce greenhouse gas emissions in aviation, are presented.

The yield strength modeling of intermetallyds Ni3(Al,Me) monocrystalline alloys of turbine blades

2025-01-31T09:40:36+00:00

New materials are characterized by limited information about their properties, which is necessary for calculating the stress-strain state of turbine blades. Under these conditions, a need for theoretical methods for calculating elastic, thermophysical, and strength characteristics arises based on taking into account interatomic interaction forces, since classical methods for calculating the mechanics of a deformable solid based on the continuity hypothesis do not allow this. The results of calculating the temperature dependence of the yield strength of Ni3(Al, Me) intermetallics of single-crystal alloys of turbine blades are presented

Macrophenomenological modeling to determine an efficient grain structure for the gas turbine engine disk

2024-12-26T19:57:51+00:00

The paper considers the issue of the influence of the average grain size on the complex of strength characteristics of the turbine disk of a gas turbine engine made of Inconel 718 alloy. For a structurally similar element in the conditions of stationary engine operation, the initial boundary value problem of determining temperature, strain and stress fields was posed and solved. The applied material model allows us to take into account the dependence of the fatigue properties and the plasticity limit of the material on the average grain size. A number of numerical experiments were carried out in which a gradient and uniform grain size distribution over the disk radius was set, and the fulfillment of static and kinematic fatigue strength criteria for various areas of the part was verified. The results of numerical modeling have shown that the gradient grain size distribution – from 30 microns near the hub to 60 microns near the rim – under the conditions under consideration shows better resistance to fatigue strength, and provides a greater margin of static strength compared with the uniform design of the average grain size. The comprehensive analysis showed the stability of the developed model to perturbations of the key parameters of exposure (temperature) and the state of the structure (grain size).

Thermogasdynamic modeling of “hot” hovering in the TA-14 APU

2025-01-15T17:47:02+00:00

This article presents a comparison of the results of thermogasdynamic modeling and experimental data on the high-altitude start of the TA-14 auxiliary power unit (APU) with “hot” hovering. The modeling stages are described, and the average error at control points is calculated.

A formalized approach to assessing the qualitative conditions of the ion-plasma hardening coating process

2025-01-22T07:34:08+00:00

A method is proposed for quantifying the qualitative state of ion-plasma coating processes by analyzing a set of technological conditions of the process using qualimetry methods. A mathematical model of the complex of qualitative characteristics of the plasma medium in the coating process is considered, which assumes a quantitative assessment of the main characteristic parameters, taking into account the relationship between the operating pressure of the gas in the vacuum chamber and the presence of gas impurities in it. The results of the approbation of the proposed method under various conditions for the implementation of ion-plasma coating are presented.

Calculation of the effective engine power of machine and tractor units based on probabilistic and statistical operational characteristics

2025-04-28T06:59:21+00:00

This article discusses a mathematical model for calculating the effective engine power of machine and tractor units based on their probabilistic and statistical performance characteristics, tak ing into account the use of an additional transport and technological module. The developed mathematical model is implemented in Python. A computational experiment was also conducted to calculate the power required for the transport and technological module

Investigation of durability of steel ropes depending on used lubricant and external operating conditions.

2025-02-06T04:41:39+00:00

The paper presents the dependence of determining the number of cycles of bending the steel rope before destruction, depending on the type of steel rope, its operational factors, as well as the used lubricant and external operating conditions. A method has been developed to determine the values of the С₁ and K coefficients, taking into account the influence of the lubricant used and the external operating conditions of the steel rope, respectively. It was found that the lubricant increases the durability of the steel rope at least 1,9 times when tested under normal climatic conditions, 1,7 times when exposed to a negative temperature of minus 60° C and 1,3 times when exposed to sea water, in relation to the non-lubricated rope.

About silver loss during soldering with silver containing solders in vacuum

2025-02-07T10:53:30+00:00

The recent emergence of new soldering equipment, which allows the process to be carried out in a high vacuum, and the known volatility of silver in a vacuum, have raised the question of the possibility of soldering structures in such equipment with silver solders. The article provides calculated estimates of the rate of evaporation of silver in a vacuum. For calculations, the equation of the molecular theory of rarefied gases was used. The results of calculations of the loss of silver used as a coating on the soldered part during contact-reactive soldering, as well as silver included in sheet solder, are presented. It has been shown that high vacuum does not prevent defect-free soldering of units with sheet silver-containing solder, and in the case of contact-reactive soldering with solder in the form of galvanic coatings, the condition of a tight fit of the soldered parts must be met.