Method of Theory of Dimensions in Experimental Research of Systems and Processes

Dmytriv, Vasyl; Dmytriv, Ihor; Horodetskyy, Ivan; HORODNIAK, Roman; Dmytriv, Taras

doi:10.35633/inmateh-65-24

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…The above-listed studies are limited by the number of parameters that can be taken into account during the modeling of the dosing process and in experimental research. To take into account the maximum number of indicators, Dmytriv et al [41] propose using the method of complex criterion equations that combine several parameters in experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Efficiency of the Centrifugal Conical Disk Dispenser of Bulk Materials

Dmytriv,

Bembenek,

Banha

et al. 2024

Materials

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Centrifugal disk dispensers are widely used in various tasks of dosing bulk, dispersed materials. The design of the disk depends on the physical and mechanical characteristics of the dosing medium. The work discusses the development of an analytical model of the movement of a material particle along a conical centrifugal disk depending on the kinematic characteristics of the dosing process and the characteristics of the dosing material, as well as experimental confirmation of the theoretical model, which is relevant for the calculation and design of working elements of this type. The obtained system of differential equations is solved using the Runge–Kutta numerical method. Experimental studies were carried out using the method of a planned factorial experiment. The experiment was conducted for three factors at three levels. The feedback criterion was the performance of a centrifugal conical disk dispenser for bulk materials. The disk cone angle was set at 10, 20, and 30°. The disk diameter was 130, 150, and 170 mm, the gap between the disk and the edge of the hopper neck was 6, 8, and 10 mm, and the rotational speed of the conical disk was 0.65, 1.02, and 1.39 rad/s. The dispensing rate of the dispenser ranged from 15 to 770 g/s, depending on the values of the experimental factors. For use in the regression equation of the natural values of the factors, a method of transforming the terms of the equation from coded values to natural ones is provided. The obtained experimental correlation dependencies were checked for reproducibility with Cochrane’s test, and the adequacy of the model was checked using Fisher’s test. The significance of the coefficients in the correlation equation was evaluated using the Student’s t-test. The difference between the experimental data and the results of the theoretical modeling does not exceed 5%. The obtained system of differential equations makes it possible to model the radial velocity of the ascent of bulk material from the conical rotating disk depending on the rotation frequency, disk diameter, and the height of the annular gap between the discharge throat of the hopper and the conical disk. The analytical model enables the modeling of the productivity of the conical dispenser for bulk materials for arbitrary parameters of rotation frequency, disk diameter, and the size of the annular gap between the discharge throat of the hopper and the conical disk.

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Section: Introductionmentioning

confidence: 99%

Modeling of the Efficiency of the Centrifugal Conical Disk Dispenser of Bulk Materials

Dmytriv,

Bembenek,

Banha

et al. 2024

Materials

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“…The development of surfacing technologies is carried out by taking into account theoretical approaches to the selection of the alloy component composition [22,23,24], technological heredity [25], and optimization of detail manufacturing technologies [26] to ensure the functioning of products during the life cycle [27,28].…”

Section: Introdactionmentioning

confidence: 99%

Comparative studies of the three-body abrasion wear resistance of hardfacing Fe-Cr-C-B-Ti alloy

Trembach

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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In this research, the mechanical and tribological properties of two deposited metal of Fe-C-Cr-B-Ti alloying systems. In this study, comparative tests of the deposited metal hardfacing by two self-shielded flux-cored wires electrode were carried out: with an exothermic additive (110Cr4Cu5Ti1MnVB) and without an exothermic additive (140Cr15TiSi1MnVB). Abrasive wear resistance was evaluated using a slightly modified procedure on a standardized tribological machine for abrasive wear, according to the limits established by the ASTM G65. The results of studies of the efficiency of introduction of an exothermic addition CuO-Al system into the core filler of a flux-cored wire electrode were presented.

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“…Brake discs, drums, and pulleys are usually made from cast or rolled billets and 3D printed. During the manufacture of machine parts, considerable attention is paid to achieving accuracy [8,9,10] and the quality of operational surfaces [11,12,13], optimization of technologies [14], iincluding taking into account technological heredity [15], to ensure long-term operation of engineering products during their life cycle [16,17].…”

Section: Introductionmentioning

confidence: 99%

Analytical study of heat transfer through friction overlay of band-pad brakes

Pazen

Tatsiy

Ropyak

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The paper analyses the operating conditions of band-pad brakes of drilling winch, materials and coatings for strengthening the metal elements of friction pairs. Methods of researching the thermal and stress-strain state of elements of brake friction units are considered. The problem of the development and theoretical research of the properties of new polymer materials with gradient properties for the production of friction overlays of band-pad brakes with improved operational characteristics is singled out. A mathematical model heat transfer through friction overlays of band-pad brakes of drilling winches with a variable coefficient of thermal conductivity of the material based on the thickness of the specified overlays has been developed. According to the developed mathematical model, an analytical study of the process of heat transfer through the friction overlays of band-pad with variable coefficient of thermal conductivity of their polymer material according to the thickness of the friction overlays was carried out according to different laws. It was established that the highest intensity of heat removal from the friction zone of the brakes is ensured when the thermal conductivity coefficient changes according to the law described by a second-order polynomial.

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Method of Theory of Dimensions in Experimental Research of Systems and Processes

Cited by 4 publications

References 20 publications

Modeling of the Efficiency of the Centrifugal Conical Disk Dispenser of Bulk Materials

Modeling of the Efficiency of the Centrifugal Conical Disk Dispenser of Bulk Materials

Comparative studies of the three-body abrasion wear resistance of hardfacing Fe-Cr-C-B-Ti alloy

Analytical study of heat transfer through friction overlay of band-pad brakes

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