No. 9

Abstracts. No. 9, 2021 year
 
ABSTRACTS
Sigov A.S., Kudzh S.A. (e-mail: vsleptsov@gmail.com)
To the 85th anniversary of the founding of Moscow State University of Instrument Engineering and Computer Sciences (MGUPI)

The article discusses the issues of the founding and development of MGUPI, whose activities are related to training of highly qualified specialists for the country.

Keywords: industry, specialists, enterprises, training, instrumentation, informatics, economics.

Kondratenko V.S., Kadomkin V.V., Naumov A.S., Velikovsky I.E. (e-mail: vsk1950@mail.ru)
Laser treatment of metals using immersion coolant

The article considers the application of a new method of laser separation of materials in metal processing – the method of laser immersion processing of materials. The possibilities and advantages of the method are considered, the obtained experimental results are evaluated.

Keywords: laser cutting, immersion processing of materials, laser cutting of metals.

Shkatov P.N., Didin G.А., Ermolaev A.A., Rodyukov M.S. (e-mail: petr_shkatov@mail.ru)
Flaw detection of graphite electrodes in electric furnaces

The work is devoted to the identification of continuity defects in the cylindrical graphite electrodes of electric furnaces by the eddy current and ACFM method based on passing an alternating current through the object and registering the distribution of the magnetic field over the controlled area. The theoretical analysis of the proposed two-frequency flaw detection method ACFM method is carried out. The threshold parameters of defects detected by the eddy current and ACFM methods against the background of the noise component determined by the inhomogeneity of the electrode material are experimentally determined.

Keywords: electrodes, flaw detection, eddy current method, ACFM method.

Sleptsov V.V., Lagunova A.D., Ablaeva A.E., Dinh Ba Phuong (e-mail: sleptsov@mirea.ru)
Development and analysis of information-measuring and tricopter control systems

The article deals with the issues of synthesis and analysis of information-measuring and control systems of tricopters. A feature of the work is the development of a general mathematical model of the tricopter, taking into account the specific characteristics of the elements: adjustable electric drives (both DC and AC), parameter sensors (barometers, accelerometers, range finders, etc.). The type and parameters of regulators of tricopter coordinates control systems are determined.

Keywords: tricopter, adjustable electric drive, parameter sensors, modulus optimum.

Shkatov P.N., Kuzub I.G., Ermolaev A.A. (e-mail: petr_shkatov@mail.ru)
Tuning from the influence of the variation of electromagnetic propertiesmetal in determining the depth of surface cracks by potential drop technique

The work is devoted to increasing the accuracy of measuring the depth of surface cracks by the potential drop technique by suppressing the influence of changes in the electromagnetic properties of the metal on the defective area in comparison with the defect-free one. This is achieved by eliminating the need for measurements on a defect-free area in the proposed method for determining the depth of a crack.

Keywords: the potential drop technique, crack depth.

Arbuzov V.N., Ivchenko V.D. (e-mail: arbuzov@mirea.ru)
Application of the most advanced functions to compress information and identify the most informative diagnostic signs

The solution to the diagnostic problem presupposes the presence of a large amount of information about the state of the system in various modes of its operation. To process, store and make decisions based on such information, significant amounts of on-board computer memory are required. Providing the required amount of memory in on-board computing devices is currently a simple, but costly task. Significant memory savings can be achieved by storing not the realizations themselves, but their codes, which are the coefficients of the expansion of the realizations in some n preselected orthonormal functions. This method, along with a gain in the amount of memory, makes it possible to apply the algorithm for making a decision on the state of the system adopted in the problem of pattern recognition. The idea of the algorithm is as follows. Each realization is associated with a point in n-dimensional space with a basis of n orthonormal functions. The coordinates of this point are the expansion coefficients. With this approach, it is possible to identify areas that are characteristic of each system malfunction. By the magnitude of the distance from the point characterizing the current implementation to the nearest point or to the center of some area, one can judge the health of the system or determine the type of malfunction. With this approach, the problem is reduced to the choice of such orthonormal functions that provide an acceptable accuracy of the expansion for the minimum value of n. Such functions are called the best fit.

The most adapted functions are found as eigenfunctions corresponding to the smallest eigenvalues of the integral equation, which provides the minimum of the total squared error of approximation of all realizations.

An algorithm for finding eigenfunctions has been developed and results are presented that confirm the efficiency of the algorithm.

Keywords: pattern recognition, orthogonal series, eigenfunctions, eigenvalues, orthogonal expansions, technical diagnostics.

Kosbergenov E.Zh. (e-mail: ernazar.kosbergenov@gmail.com)
The influence of nickel atoms on the radiation and thermal stability of polycrystalline silicon

It is shown that alloying polycrystalline silicon with nickel leads to a significant weakening of radiation defect formation at doses of γ-irradiation up to 5 · 107 R. In addition, the material's resistance to technological heat treatment increases.

Keywords: polycrystalline silicon, diffusion, nickel, γ-irradiation.

Senyanskii M.V., Gavrilenkov S.I. (e-mail: mv@tenso-m.ru)
A method for evaluating the accuracy of automatic measurement of weight parameters of vehicles at extreme axle loads and velocities

Automatic monitoring of weight and dimensions is widely used in Russian for monitoring of the axle load of road vehicles to provide road safety and prevent pavement damage. During the test of weigh-in-motion (WIM) systems, it is necessary to measure axle load in the whole measuring range of loads and vehicle velocities, which is unfeasible without violating traffic road regulations and cargo transportation regulations. This paper proposed a method of evaluating WIM system accuracy using a dynamic loading device, which rules out the need for test ride of reference vehicles with maximum velocities and axle loads.

Keywords: Weigh-in-motion (WIM), measurement error, dynamic characteristic, natural frequency.

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