Issue № 3(7) Vestnik of Tver State Technical University. Series «Technical Science»

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• ON THE ONE NONSTANDARD PARAMETER OF A ROUGH SURFACE PROFILE
  Authors: V.V. IZMAILOV, Dr. Sc., M.V. NOVOSELOVA, Cand. Sc.
  Abstract: A dimensionless profile parameter of a rough technical surface μ is proposed, which characterizes its operational properties, including tribotechnical ones. The parameter characterizes the relative location of the profile mean line along the height of the rough layer and is equal to the ratio of the maximum profile valley depth to the maximum height of the profile within the sampling length. For a symmetrical profile, μ = 0,5. Values μ > 0,5 correspond to a surface with a predominant location of the material in the upper sections of the rough layer and individual deep valleys. Such a surface has increased rigidity and wear resistance, good oil absorption, i.e. has a combination of positive tribotechnical properties. The advantages of the proposed parameter are visibility, ease of calculation and low variability
  Keywords: rough surface, topography, profile, roughness parameters, operational properties.

• MODELING OF THERMOPHYSICAL PHENOMENA
  Authors: A.M. MIGRANOV, M.Sh. MIGRANOV, Dr. Sc., A.F. SADYKOV, I.I. KHUSAENOV
  Abstract: The results of the computer modeling of thermophysical phenomena in the contact zone during blade cutting of metals with multi-layer composite wear-resistant coatings are presented. These results ensure the adaptability of the cutting wedge to friction conditions. In-situ experimental studies of the cutting temperature during turning with various coatings and structural-phase analysis of the surface layer of the cutting tool were carried out to explain the mechanism of formation of secondary structures with a shielding effect - the self-organization effect.
  Keywords: wear, tribosystem, activation, passivation, secondary structures, self-organization, thermal phenomena, wear-resistant coatings, shielding effect.

• SYNTHESIS OF THE COMPOSITE CERAMIC MATERIAL AND INVESTIGATION OF ITS ABRASIVE PROPERTIES
  Authors: A.N. BOLOTOV, Dr. Sc., O.O. NOVIKOVA, Cand. Sc., V.V. NOVIKOV, Cand. Sc.
  Abstract: The innovative diamond-containing composite material formed by micro-arc oxidation on the surface of a sintered billet from a diamond-aluminum mixture has been developed. The method of the modification of the basic technology of a material obtaining has been proposed in order to reduce energy consumption and improve its frictional properties. The total time of material formation is reduced by replacing a part of the aluminum powder with white fused abrasive alumina powder, subsequent sintering and formation of diamond-ceramic material by micro-arc oxidation. It was found that the addition of corundum powder has a positive effect on the progress of the microarc oxidation process. A basic structural model of the new material has been developed. Friction tests have shown the advantage of diamond-containing materials of modified composition in comparison with the basic one. It is proposed to use the new material as a tool one for precision abrasive micro-processing of solid materials.
  Keywords: abrasive ceramic material, micro-arc oxidation, aluminum oxide modifications, friction, wear.

• THE RELIABILITY ANALYSIS OF PEAT MACHINES FOR MILLING METHOD OF PRODUCTION
  Authors: I.V. GORLOV, Dr. Sc.
  Abstract: The methodology for determining of the reliability parameters of peat machines that do not have sufficient statistical data on operation has been proposed. The proposed approach will permit to determine the change of the technical status of a wide range of peat machines for the milling method of extraction. It will enable peat enterprises to operate taking into account their individual condition and plans for the peat production, and will permit to carry out the major repairs of technological equipment in the autumn-winter period without decreasing the works productivity in the mining season. For peat machines that do not have enough statistical data to analyze their operation, one can use the generalized data on similar peat machines to obtain approximate dependencies which permit to predict changes in the technical state of the equipment under study with some accuracy. With an increase of statistical data amount, it is proposed to use the coefficient method using operational data. It permits to improve the quality of forecasting and as a result to reduce the number of downtime due to failures and to increase the seasonal productivity of peat machines.
  Keywords: peat machines, operation, reliability, resource, forecasting, productivity, research.

• STUDY OF THE OPERATION OF THE SUCTION NOZZLE OF PEAT PNEUMATIC HARVESTER
  Authors: А.L. YABLONEV, Dr. Sc., D.M. SCHERBAKOVA
  Abstract: The extraction of milled peat by the pneumatic harvesting complex of machines has a number of advantages in contrast to the mechanical method. These advantages are as follows: the milling of wet peat deposits during harvesting is excluded, the range of required equi-pment is reduced, and the cycle time is shortened from two to one day. The latter is especially important, since two-day periods with good sunny weather in the production season are much less than one-day ones. Therefore, in general, the reliability of the method with pneumatic peat harvesting is higher. To evaluate the efficiency of the modern KTT-2 pneumatic harvesting machine, a field experiment was conducted to evaluate the suction speed of the nozzle of the machine. The results of the study made it possible to build the velocity field of the suction torch and determine the maximum suction speed – 26.74 m/s. The minimum air flow velocity in the studied zone is 0.3 m/s and is observed at a distance of 0.5 m from the nozzle. An analysis of the velocity field of the suction torch revealed the dependence of the air flow velocity on the distance from the nozzle. The size of the active zone of the suction plume has been identified and ways to optimize its size have been proposed.
  Keywords: peat, weather conditions, pneumatic harvesting machine, suction torch, nozzle, active zone, fractional composition, anemometer

• EFFECT OF OPERATING PARAMETERS OF VERTICAL PNEUMATIC TRANSPORT OF CRUSHED PEAT ON RELATIVE SLIDING OF AIR AND SOLID PHASES
  Authors: S.M. PETRENKO, N.I. BEREZOVSKY, Dr. Sc.
  Abstract: The actual operating parameters of the vertical pneumatic conveying of milled peat are determined by numerical methods on the grounds of the pressure differential in the pneumatic conveying pipeline section and flow rates known from experience. The assessment of the influence of the main operating parameters on the coefficient of relative slip of the air and solid phases is carried out.
  Keywords: vertical pneumatic conveying, crushed peat, actual operating parameters, air and solid phase, relative slip.

• THE IMPROVED METHODOLOGY OF PREPARATION FOR THE PERSPECTIVE COMPLEX OF AUTOMATION TOOLS OF THE CONTROL POINT OF THE AIR DEFENSE FORMATION
  Authors: V.A. MORENKOV, Cand. Sc., I.S. ZHIKHAREV, Adjunct
  Abstract: The article describes the existing training methodology for a promising set of automation tools for a control point of an air defense unit, shows ways to improve it on the base of use of modern information technology of training in the light of adopting a promising complex of automation tools, as well as taking into account organizational and technical shortcomings, which are the reasons for the low level of practical training of students.
  Keywords: a complex of automation tools, information technology, simulator, practical level of training, training methodology, expert method.

• METHODOLOGY OF CALCULATING OF THE RAMIFICATION OF THE DIGITAL RADIO RELAY DATA TRANSMISSION NETWORK OF THE AEROSPACE FORCES ASSOCIATION
  Authors: S.E. MIKHAILOV, Adjunct
  Abstract: The article considers a methodology for increasing the stability of a digital data transmission network, which will take into account connectivity when changing its structure, due to rational clustering of communication centers using neural networks.
  Keywords: control system, communication system, radio relay network, neural network, clustering of communication centers.

• QUALITY CONTROL SYSTEM FOR THE TECHNOLOGICAL PROCESS OF THE BAKERY PRODUCTS MANUFACTURE BASED ON FUZZY LOGIC MODELS
  Authors: M.A. ALLYAMSHIN, P.M. MURASHEV, V.N. BOGATIKOV, Dr. Sc.,
  Abstract: The paper considers a fuzzy model of a system for the control of bakery products technology, as one of the tools for use in an expert system for making decisions. On the grounds of the selected parameters the technological process of the manufacture of bakery products in a small bakery is evaluated and the results of experiments and the operation of the fuzzy control model are compared.
  Keywords: quality control system; technological process; bakery product; random disturbances; expectation; variance; standard deviation; decomposition of context diagram; context diagram; fuzzy rules

• DISPATCHING ALGORITHMS FOR THE PRODUCTION UNITS WORK
  Authors: G.B. BURDO, Dr. Sc.
  Abstract: Presents the approach to dispatching the work of mechanical processing technological divisions of machine-building single and small-scale multi-product production plants. Algorithms for technological processes dispatching based on the fuzzy control method are shown. Input and output fuzzy variables are defined and their membership functions are shown. The control algorithm is given in the form of fuzzy rules. An example of the algorithm implementation is shown.
  Keywords: machine-building multi-nomenclature production, dispatching, production rules, technological process.

• INFRARED THERMOCHEMICAL GAS AND VAPOR DETECTOR STUDY
  Authors: L.V. ILIYASOV, Dr. Sc.
  Abstract: The results of experimental study of the thermochemical gas and vapor detector (ITCGVD) are given. Functional principle of this detector is based on the measurement of infrared radiation intensity formed during catalytic combustion of flammable gases and vapors on the pellistor surface. The ITCGVD scheme is described. It contains the measuring and the comparing cells equipped with pellistors and infrared diodes working in photogalvanic mode and a counter connected ensuring their signal difference formation, which is registered after amplification by a potentiometer. The dependences of ITCGVD signal on most important parameters were determined as a result of experimental study with use of impulse method of analyzing gases input. These parameters are as follows: analyzing gas concentration in carrier gas (air) flow, a pellistor supply voltage, a distance of a pellistor from infrared photodiode window, carrier gas flow rate. The possibility of ITCGVD use in alerters and analyzers of flammable gasses and vapors micro concentration in air was determined. Experimental correlation of detector signal to hydrogen, methane and propane volume concentration in air was developed. Possibility of ITCGVD application in gas chromatography by using the analysis of calibration gas-air mixture is shown. Basic metrological characteristics of ITCGVD were determined. They are as follows: sensitivity threshold 4 . 10–5 volume percent, maximum concentration within a linear statistical characteristic – 0.4 volume percent; linear dynamic range 1 . 104; the drift of apparent zero signal – 0.6 mV/h; time constant 0.3…1 s (depends on carrier gas flow). Measuring and comparing cell volume was 0.3 ml.
  Keywords: automation of technological processes, gas detector, thermochemical detector, infrared detector, experiment, installation, concentration.

• THE INTERACTION OF PROCESSES OF TESTING LABORATORY MANAGEMENT SYSTEM ACCORDING TO THE GOST ISO/IEC 17025-2019 REQUIREMENTS
  Authors: S.S.S. AL-BUSAIDI, S.V. PONOMAREV, Dr. Sc.
  Abstract: The execution order of the processes of the management system (MS) of the testing laboratory (TL), certified according to the requirements of the standard GOST ISO / IEC 17025-2019, is discussed. It was established that the process “8.9 Management Review” is the main process in managing activities in a testing laboratory. The interaction of this process with other MS TL processes is considered, in particular: “6.2 Personnel”, “6.4 Equipment”, “6.5 Metrological traceability”, “7.2 Selection, verification and validation of methods”, “7.6 Evaluation of measurement uncertainty”, “7.7 Ensuring the validity of results”, “7.10 Management of inappropriate work”, “8.5 Actions related to risks and opportunities”, “8.6 Improvement”, “8.7 Corrective actions”, “ 8.8. Internal Audits”, etc.
  Keywords: production control, monitoring, risks, opportunities, data analysis, management reviews, corrective actions, improvement.

• ASPECTS OF FUZZY GH-MODELS USING FOR SOCIAL RELATIONS REPRESENTING
  Authors: E.R. MUNTYAN, Cand. Sc.
  Abstract: In the article the modified graph and hypergraph models are proposed for monitoring and modeling the relations of subjects and groups of subjects in accordance with the classification of types of social relations. Modification of graph models is the combination of homogeneous, heterogeneous and multiple connections in the form of a vector. Modified hypergraph models are distinguished by the use of separate components of GH-graphs in their structure, connections between a vertex and a hyperedge, as well as connections between two hyperedges. The advantages of the proposed GH-models lie in decrease of the execution time of data analysis in systems with different types of information flows by using multiple connections in the form of a vector between vertices, which allow you to combine several different types of connections into only one
  Keywords: actor, social network, social relations, subject, fuzzy GH-graph, fuzzy GH-hypergraph, fuzzy GH-model, different types of connections, multiple connections.