The article analyzes the common methods of analysis of technical aluminum, in particular, photocolorimetric, X-ray spectral and optical emission methods, as well as the principle of operation of the equipment and their capabilities. Particular attention is paid to comparing technical and economic indicators of various methods, including the cost of analysis, equipment, the cost of electricity and equipment maintenance. The article also identifies the differences between various methods from each other and selects the most optimal analysis method in a production environment.

https://doi.org/10.48081/YDUB5196

2020

Issue 4

The study in question is the model problem for shallow tunnels that investigates the influence on elastic half-space of periodic load moving uniformly along the surface of a circular cylindrical cavity with various subsonic velocities. The motion of the half space is described in the form of dynamic equations of the theory of elasticity in the moving coordinate system. To solve the equations we used the method of incomplete variables eparation. It is shown that in order to avoid the collapse of the tunnel roof, the influence of surface Rayleigh waves on ground building structures and eventual formation in them of resonance oscillations, the speed rate for objects transported along the tunnel should be below the Rayleigh velocity.

https://doi.org/10.48081/TWLR9106

2020

Issue 4

The article presents the calculation of elements of the designed film stacker using the APM FEM system. The use of modern software tools will allow you to design and perform comprehensive engineering analysis in a high-quality, reliable and competitive manner and make constructive decisions based on it. Based on the calculation results, the most optimal values of the main parameters were selected and engineering analysis was performed to improve the quality of design solutions and reduce time spent at the stage of technological preparation. The use of the APM FEM system in the calculation of elements of agricultural machinery allows you to improve the design performance without field tests, it is possible to determine the design flaws.

https://doi.org/10.48081/DKTJ9805

2020

Issue 4

The problem of the stability of a wind power installation with a horizontal axis is considered under conditions of a change in the speed of the wind wheel rotation, which is caused by connecting and disconnecting electricity consumers. Factors affecting the stability of a wind power plant are analyzed. The movements are represented as mathematical equations. The mathematical model of the mast is an inverted pendulum with elastic fastening at the base, the air flow is assumed to be quasi-stationary. The modes of changing the rotational speed of the wind wheel, leading to an increase in mast oscillations, are found. The results of numerical simulation are presented.

https://doi.org/10.48081/KSRO3038

2020

Issue 4

The review of the operation, design, and operation features of the mini-hydro power plant that can provide electricity to a private household or a separate private house. A project has been developed to supply the private sector with electricity from a mobile hydroelectric power station. To accommodate the hydropower plant, it was decided to install the DN500 pipeline. The selected water flow rate and the difference in the location of the channel and the location of the turbine installation allow you to provide the required power. The novelty of the work consists of electrifying a private economy using a mobile hydroelectric power station and establishing the advantages and disadvantages of this solution with an assessment of the impact of all design parameters on the output parameters. The research results can be applied for the manufacture of the mobile hydroelectric power station to their usage in the peasant farms, to save electricity, as well as in the development of experimental-industrial samples of electrical installations for various purposes.

https://doi.org/10.48081/XFGH3307

2020

Issue 4

Classic hydro-test methods for tube-tube plate joint performance test are reviewed. Advantages and disadvantages of these methods are identified and reviewed. There are methods proposed to accelerate tightness and strength tests to forecast the operation of new fixed joints in their operation. Carrying out of hydraulic tests is a necessary measure to assess quality and reliability of equipment operation in future for taking appropriate measures. In the process of testing the equipment is tested for strength by test pressure, which is usually set at the level exceeding operating pressure for 15–20 %. The test pressure is estimated separately and is used both after manufacturing and during regular scheduled inspections. In this way, the reliability of the tube-tube plate joint is tested, as well as the expansion of the tube under pressure.

https://doi.org/10.48081/BHGO1953

2020

Issue 4

This article deals with the preparation of iron-containing alloys by a carbonfree method. The article is devoted to theoretical, technological and environmental issues of metallurgy, as the most important branch of the world economy, where one of the main problems is air pollution. Various processes of metal production are considered. the traditional technology of metal production is based on carbonthermal recovery, which is harmful to the environment. Special attention is paid to the technology of obtaining iron by a carbon-free method. The main problem in the production of iron-containing alloys should be of ore minerals. Carbon oxides, together with other wastes from metallurgical production, have a very significant impact on the processes of warming the Earth’s climate with all the consequences that follow from this. The article discusses the processes of obtaining iron by various methods, namely the blast furnace process, the process of obtaining iron from oxide using aluminum, and direct reduction processes.The possibility of using hydrogen to reduce iron oxide is described below. The article also highlights methods for producing hydrogen, such as steam conversion of water and methane, methane cracking, water electrolysis, and pyrolysis.

https://doi.org/10.48081/VTUX4454

2020

Issue 4