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ISSN 0536-1028 (Print) ISSN 2686-9853 (Online)

УДК 550.837

DOI: 10.21440/0536-1028-2021-8-34-44

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Introduction. The paper considers the theory and interpretation of pulse induction sounding that includes the formation measurement of the magnetic field created by a vertical magnetic dipole (VMD) over a layered medium or S-plane.
Research methods. A spectral calculation method with the numerical Fourier sine transform of the spectral function density was applied to study the non-stationary formation of the field. For the case of a homogeneous conducting half-space with the non-conducting upper half-space, it has been shown that magnetic field frequency and time characteristics change similarly, i.e. decrease equally, as the observation point depth increases.
Research results. The pulsed mode of changing the source current in the near-field zone of low frequencies or long transient periods, which are of primary interest in studying the geological section conducting properties, does not have advantages over the harmonic mode. By analyzing the behavior of a field with a source in the form of a vertical magnetic dipole, it is possible to formulate its limiting frequency and time cases. The nature of the magnetic field formation curve revealed that magnetic induction extrema values do not depend on the specific electrical resistance of the medium. However, their position in time is determined by the distance to the dipole and medium resistivity. For the known spacing for remote sounding, the dependence between the magnetic field extremum time and the medium resistivity is a way to estimate it.
Conclusions. In this work, the apparent resistivity for typical layered cross-sections of two-layer and three-layer media was calculated. It has been shown that the results for dipole magnetic field time and harmonic characteristics correspond to one another when studying inhomogeneous layered geoelectric sections.

Keywords: non-stationary electromagnetic field; remote inductive sensing; vertical magnetic dipole;
apparent electrical resistance.
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УДК 622.44

DOI: 10.21440/0536-1028-2021-8-45-54

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Research relevance. The article proves the advisability of applying high-speed axial fan systems by aerodynamic configuration with one impeller for gas air-cooling units.
Objective and methods of research. Equations for the efficiency factor of a fan system and a fan depending on flow kinematics and fan system geometry have been obtained by mathematically analyzing axial flow turbomachine main regularities.
Results. Based on the optimization theory, the formulae for maximum efficiency factor for a fan and a fan system of various specific speeds have been obtained depending on the flow coefficient and the impeller hub ratio. The method of creating the axial fan system aerodynamic configuration has been proposed for the K-type gas air-cooling units with the limiting maximum values of the efficiency factor for the prescribed values of the specific speed, impeller hub ratio, lift-to-drag ratio of the impellor profiles, airflow resistance coefficient of the flow channel, and the flow coefficient. The capability was shown to create the fan system with a speed exceeding 400 and efficiency of not less than 0.86.
Keywords: fan system; flow channel; input elements; output elements; efficiency factor; specific speed; lift-to-drag ratio; air-flow resistance coefficient.

REFERENCES

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News of the Higher Institutions. Mining Journal. 2020; 8: 81–89. (In Russ.)

УДК 622.5; 622.58

DOI: 10.21440/0536-1028-2021-8-62-71

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Introduction. The article deals with the research of parameters and characteristics of mine drainage elements for conveying unlit mine water, evaluation of efficiency and rationality of using such transport complexes as loading-delivery machines, scraper winches, wagons for mechanized cleaning of drain sumps from settling and accumulating mine sludge. At present, the solution of this issue is a widespread task for operating services of mining enterprises. At the same time, it is a promising direction for scientific research.
Methods of research. The scientific and practical experience in the field of mining drainage was analyzed and generalized. Mine drain sumps and their principles operation were described. Drain sumps operation working cycle was calculated and described. Operational parameters for a mechanized method of cleaning with transport complexes were calculated. The effectiveness of the measures for cleaning drain sumps using the means of a mechanized complex were calculated and assessed by determining quantitative efficiency indicators in the form of time spent by load-haul machines and transport complexes for cleaning.
Results and analysis. The efficiency of transport complexes was evaluated by calculating the time of their use for non-productive work. The structural scheme of sequential operation of water collectors and the process of their treatment during the calendar time is developed. It is determined that the existing drain sumps currently perform the function of mine water clarification ineffectively. The interrelation of decreasing of operating time of elements of centrifugal drainage pumps and composition of pumped liquid has been established.
Scope of results. The results of the research are recommended for implementation for all enterprises conducting underground mining works with the use of mine drainage, as well as for design institutes designing mine workings.

Keywords: drain sump; transport complex; productive time.

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УДК 622.6

DOI: 10.21440/0536-1028-2021-8-55-61

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By studying this curve, it will be possible to find equivalent forces and, based on the comparative estimation, develop design recommendations for choosing the graph’s efficient shape. Trapezoidal and parabola graphs are most common. This research determines the equivalent force at a trapezoidal velocity graph.
Methods of research. The analytic calculation takes into account that the trapezoidal graph allows many velocities and accelerations not only at different, but also at constant values of the rise and travel time, whereas the parabola velocity graph does not. It greatly widens the possibilities for efficient dynamic modes selection. The non-isosceles property of a trapezoidal widens the possibilities still greater. The indicated properties of the trapezoidal graph were taken into account when deriving the estimated dependencies.
Research result. The kinematics of the mine winder vessel with a trapezoidal velocity graph is analyzed. Formulas have been obtained that allow to determine the root-mean-square and equivalent effort, suited for feasibility estimation a trapezoidal graph, without preliminary calculation a n d graphs of velocity, acceleration and force.
Conclusions. The trapezoidal velocity graph provides the possibility of a large choice of energetically expedient dynamic modes, since these modes depend not only on the frequency of operations, but also on graph’s degree of incompleteness and asymmetry coefficient. The kinematic and force dependencies obtained analytically make it possible to make a reasonable choice of the velocity graph when designing a mine winder.
Keywords: mine winder; equivalent force; root mean square force; hoisting speed; velocity graph; trapezoidal graph; velocity graph asymmetry.

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