Calculation of working profiles of rotary machines, consistent with their gears

Leonid Kutsenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0003-1554-8848

Sergey Vasyliev

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-6602-8765

Borys Kryvoshei

National University of Civil Defence of Ukraine

https://orcid.org/0000-0002-2561-5568

Elena Sukharkova

National University of Civil Defence of Ukraine

https//orcid.org/0000-0003-1033-4728

DOI: https://doi.org/10.52363/2524-0226-2022-35-12

Keywords: geometric modeling, rotary planetary mechanism, Wankel machine, functions of a complex variable

Аnnotation

A method for calculating a rotary planetary machine of the Wankel system is presented. A feature of the Wankel machine is that the movement of the rotor in relation to the body is carried out using a planetary mechanism, which is based on an internal gear. The proposed method makes it possible to take into account the connection between the parameters of the geometric shape of two pairs of mutually conjugate curves characteristic of the Wankel machine. The first pair of curves are the working profiles of the casing and the rotor. The second pair is formed by the tooth profiles of the internal gears. Accounting for this connection made it possible to find a description of the function of the change in time of working volumes limited by the profiles of the body and rotor (i.e., to determine the productivity of the machine). As a result of the research, it was found that the performance of the Wankel machine can be found by taking into account three features of this machine. The shaping of the conjugated working profiles of the rotor and stator is carried out using a planetary mechanism, for the calculation of which the functions of complex variables are used. The performance function of the machine is determined by the change in time of the volumes of space limited by the working profiles of the rotor and housing. An approximate description of the functions of changing the working volumes of the machine with time was carried out using specially developed graphic constructions. To match the geometrical parameters of the Wankel with the parameters of the tooth profiles of the gear train of the internal clutch, a method of graphic running has been developed. The results obtained are useful because the scheme of the considered Wankel machine is embedded in the design of the internal combustion engine of the same name, as well as in the design of various hydraulic machines, pumps, compressors, etc.

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Research of parameters of explosive zones of reservoirs with light oil products

Oleg Kulakov

National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-5236-1949

Albert Katunin

National University of Civil Defence of Ukraine

http://orcid.org/0000-0003-2171-4558

Yuliia Mykhailovska

National University of Civil Defence of Ukraine

http://orcid.org/0000-0003-1090-5033

DOI: https://doi.org/10.52363/2524-0226-2022-35-10

Keywords: explosive zone, reservoir, light oil products, explosive environment, wind speed, speed of source

Аnnotation

Classes and sizes of explosive zones of reservoirs are set with light oil products depending on the terms of their storage: into a reservoir, round respiratory to the valve that does not eliminate the coil of dangerous vapour from a reservoir in an atmosphere, and during rapid uncatastrophic depressurization of reservoir. Calculations came true by three methods: by the calculation method of determination of hypothetical volume, calculation method with the use of nomograms and determined method. The calculations executed by the determined method do not answer the results got with the use of calculation methods. Calculations, determinations of hypothetical volume conducted by a method, the high sizes of explosive zones give pain in comparing to got a method with the use of nomograms. Classes and sizes of zones after the determined method are fixed and case insensitive environment. Into a reservoir the explosive zone of class takes place 0. Round a respiratory to the valve reservoir depending on the rate of movement evaporation through opening to the valve at different speeds of wind at normal terms after calculation methods time of existence of explosive zone is maximal in default of the forced dispersion of explosive mixture. At the increase of rate of movement evaporation through opening of respiratory to the valve increase of radius of explosive zone it takes place on a logarithmic law. The change of temperature results in the insignificant change of radius. During depressurization of reservoir of increase of radius of explosive zone at the increase of speed of source takes place also on a logarithmic law. Radius of zone, got the method of determination of hypothetical volume have in two times exceeds the radius expected by a method with the use of nomograms. A maximally possible radius presents a 20 m and 9 m accordingly at speed of source of petrol 10 kg/s a radius is fixed the Determined method at the level of a 3 m for all terms of source.

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Determination of thermal impact formation parameters for testing fire detectors

Yaroslav Kalchenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-3482-0782

Kostiantyn Afanasenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0003-1877-1551

Diana Іstratova

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-5229-5600

DOI: https://doi.org/10.52363/2524-0226-2022-35-11

Keywords: thermoresistive sensitive element, thermal fire detector, thermal effect

Аnnotation

Experimental studies have been carried out to determine the parameters of the formation of thermal effects on the thermoresistive sensitive element of thermal fire detectors during tests using a method based on the Joule-Lenz law. According to the results of the experiment, a mathematical model of the dependence of the temperature of the thermistor on the electric current and the electric voltage applied to it during the tests. The graph of dependence of temperature of a sensitive element on these parameters is constructed. From the analysis of the graph it follows that the temperature of the sensitive element of the thermal fire detector largely depends on the electrical voltage applied to it during the tests. The time of reaching the temperature of the thermoresistive sensitive element of the temperature of operation of thermal fire detectors of class A1 has been experimentally determined. The numerical values of the parameters of the formation of thermal influence on the thermoresistive sensitive element of the thermal detector, when conducting tests based on the Joule-Lenz law, are presented in the form of tables. The recommended values of electric voltage and electric current for heating the thermoresistive sensitive element to a temperature of 54 ºС, which is the minimum operating temperature of thermal fire detectors of class A1, have been determined. Limit values of electric voltage and electric current at which the sensitive element of the detector is not heated to the minimum operating temperature are determined. It is shown that the obtained research results can form the basis for the development of new thermal fire detectors, which are tested in automatic mode and at the place of its installation. It is shown that conducting tests of thermal fire detectors by a method based on the Joule-Lenz law will reduce the time of its conduct by at least 1,83 times.

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8. Abramov, Y. O., Kalchenko, Y. Y. (2020). Theoretical bases of tests of thermal fire detectors. NUCDU, 120.
9. Kalchenko, Y. Y., Abramov, Y. O. (2015). Identification of dynamic setting fire detectors with thermoresistive sensitive element.Fire Safety Journal, 37, 71–74. http://repositsc.nuczu.edu.ua/handle/123456789/11586
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Improvement of the probability model of a typical fragment of the departmental digital telecommunications network of the SESU

Andrew Feshchenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-4869-6428

Alexander Zakora

National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-9042-6838

Larisa Borisova

National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-6554-1949

DOI: https://doi.org/10.52363/2524-0226-2022-35-9

Keywords: digital telecommunication network, reliability, probability of trouble-free operation, emergency situation

Аnnotation

The analysis of working conditions of constituent elements, hierarchy of structure of departmental digital telecommunication network allows to consider it as set of standard fragments which are executed without reservation, and with repeated reservation of the central, regional, regional knots connected by communication channels for which block diagrams are developed. reliability and probabilistic models taking into account the standardized operating parameters of these elements. It is shown that the required reliability of the telecommunication network is achieved by increasing the reliability of its elements and multiplicity of redundancy, with uncertain influence on the maintenance of equipment, so studies of the dependence of the probability of good condition of the redundancy of the corresponding network nodes and communication channels and are given in the form of analytical and graphic materials of statistical mathematical modeling. As a result of research it is established that in order to reduce the requirements for the reliability of the elements of a typical fragment of the departmental digital telecommunications network it is enough to use structural separate double redundancy of nodes of different hierarchies in the presence of triple redundancy. Research data are useful and important to increase the probability of good condition of a typical fragment of the departmental telecommunications network as at the design stage by choosing the structure and multiplicity of redundancy nodes not only at the central level but also at regional and district level nodes. maintenance of nodes and communication channels depending on the ratio of the period of preventive maintenance to the time of operation to failure.

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11. Feshchenko, A., Zakora, O., Borysova, L., (2021). Rozrobka imovirnisnoyi modeli typovoho frahmenta vidomchoyi tsyfrovoyi telekomunikatsiynoyi merezhi DSNS. Problems of Emergency Situations, 1(33), 222–233. URL: http://repositsc.nuczu.edu.ua/handle/123456789/13957, doi: 52363/2524-0226-2021-33-17