scholarly journals Continuous-Discrete Boundary Problems in the Concepts of the Construction of Foundry Rotary-Conveyor Lines

2019 ◽  
Vol 57 ◽  
pp. 29-34
Author(s):  
Volodymyr Doroshenko ◽  
Volodymyr Kravchenko ◽  
Olena Mul ◽  
Olena Tokova
Keyword(s):  
Technological Parameters ◽  
Boundary Problems ◽  
Interval Model ◽  
Conveyor Line ◽  
Sand Mixture ◽  
Dispersed Medium ◽  
Rotational Systems ◽  
Production Output ◽  
Metal Castings ◽  
The Given

The problem of mathematical construction for the process of the control of the metal casting crystallization and cooling in a foundry mold is considered. The casting is surrounded by a layer of sand mixture, which is a porous dispersed medium that conducts heat, in terms of the concepts of the construction of foundry rotary-conveyor lines (RCL). The problem of developing an interval model for determining the speed of the conveyor line from the production of metal castings is studied. Herewith, continuous processes of the transport and technological movement of the processed materials, equipment, tools, energy carriers, and final production output are combined with inevitable stops of this continuity, which lead to discreteness, and a combination with a number of accompanying continuous, discrete or reciprocating processes. The adequacy of the model for the given technological parameters is justified. The mathematical description and agreement of the values of technological parameters for regulation and finding the optimal speed of the conveyor line at the interaction of its component rotational systems, as well as the mathematical models for program control and remote monitoring of technological modes in order to obtain the casting of the given quality are considered. The possibility of selecting the corrective parameters for the change of the conveyor line speed is shown. Tiek skatīta matemātiskās konstrukcijas problēma metāla liešanas kristalizācijas un dzesēšanas kontroles procesam liešanas veidnē. Lējumu ieskauj smilšu maisījuma slānis, kas ir poraini izkliedēts materiāls, kas vada siltumu. Lietojot lietuves rotācijas konveijeru līniju (RCL) koncepciju, tiek pētīta intervāla modeļa izveides problēma konveijera līnijas ātruma noteikšanai metāla lējumu ražošanai. Tajā pašā laikā nepārtraukti apstrādājamo materiālu, iekārtu, rīku, enerģijas nesēju un gala produkcijas transportēšanas un tehnoloģiskās kustības procesi tiek apvienoti ar šīs nepārtrauktības neizbēgamajiem apstāšanās gadījumiem, kas noved pie kombinācijas ar vairākiem nepārtrauktiem, diskrētiem vai pārvietošanās procesiem. Ir pierādīta modeļa piemērotība attiecīgajiem tehnoloģiskajiem parametriem. Tiek parādīta iespēja izvēlēties koriģējošos parametrus konveijera līnijas ātruma maiņai.

USE OF ACRYLIC COPOLYMER ADDITIVE SOIL STABILIZATION PLUS FOR PREPARATION OF MIXTURES MADE BY COLD RESYCLING TECHNOLOGY AND CRUSHED STONE-SAND MIXTURES IN PAVEMENT FOUNDATION LAYERS

2021 ◽  
Vol 2021 (24) ◽  
pp. 48-59
Author(s):  
Anatolii Mudrychenko ◽  
◽  
Ivan Balashov ◽  
Sergey Illyasch ◽  
◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Soil Stabilization ◽  
Crushed Stone ◽  
Technological Parameters ◽  
Acrylic Copolymer ◽  
Sand Mixture ◽  
Recycling Technology ◽  
Complex Binder ◽  
Cold Recycling ◽  
Pavement Foundation

ntroduction. Rehabilitation of public roads network requires a comprehensive recovery with strengthening of the bearing capacity of the pavement foundation. Rehabilitation of the foundation bearing capacity performed by arranging layers of road material made by cold recycling technology (hereinafter — CRRM) in accordance with [4] or by arranging a layer of crushed stone — sand mixture reinforced with cement or complex binder (hereinafter — CSSM 20) according to [13]. Purpose. The purpose of the work is to study the feasibility of using acrylic additives for the preparation of mixtures made by cold recycling technology and crushed stone-sand mixtures treated with cement in the layers of pavement foundation. Materials and methods. Experimental comparative tests of CRRM and CSSM 20 with different content of complex binder were performed. Results. Feasibility of acrylic additives use has been established (hereinafter — the additive) for the preparation of CRRM and CSSM 20 in the pavement foundation layers. Recommendations on technological parameters of preparation, transportation, laying and compaction of mentioned mixtures are given. Conclusions. Performed researches have shown that according to physical and mechanical indicators CRRM and CSSM20 meet the requirements of the current normative documents of Ukraine. The advantages of use are noted.

scholarly journals LEAN MANUFACTURING PROCESS PLANNING FOR 5 AXES CNC DRIVEN MILLING MACHINE

2019 ◽  
Vol 4 (1) ◽  
pp. 10-28
Author(s):  
Sándor Bodzás ◽  
Béla Krakkó
Keyword(s):  
Lean Manufacturing ◽  
Optimal Choice ◽  
Depth Of Cut ◽  
Milling Machine ◽  
Technological Parameters ◽  
Future State ◽  
Manufacturing Process Planning ◽  
Manufacturing Technologies ◽  
The Right ◽  
The Given

The aim of this publication is to determine the OEE (Overall Equipment Efficiency) indicator for 5 axes milling machine found at Diehl Aircabin Hungary Ltd. for the present and future state. Based on this value, the utilization of the machine for the given production amount can be calculated. With the optimal choice of the right production parameters (the number of cuts, feeding, depth of cut, etc.) greater productivity can be achieved i.e. the machine main time (time of cutting) will be less. The possibilities of the reduction of the machine time will be analysed and calculated. Setting of the appropriate technological parameters the machine main time could be decreased. The calculation of the machine main time will be determined for the most frequent manufacturing technologies.

scholarly journals Mathematical model of thermal processes in a biogas plant

2018 ◽  
Vol 212 ◽  
pp. 01032 ◽  
Author(s):  
Amur Fiapshev ◽  
Olesya Kilchukova ◽  
Yuriy Shekikhachev ◽  
Marat Khamokov ◽  
Luan Khazhmetov
Keyword(s):  
Mathematical Model ◽  
Heat Exchanger ◽  
Biogas Plant ◽  
Thermal Processes ◽  
Livestock Waste ◽  
Technological Parameters ◽  
Entire Volume ◽  
Design Characteristics ◽  
Alternative Sources ◽  
The Given

One of the promising areas of processing poultry and livestock waste is anaerobic digestion, which helps to prevent pollution of the natural environment, as well as to receive processing products such as gaseous fuel, biogas and highly effective biofertilizer. The use of plants for the production of biological gas as alternative sources of energy is largely determined by its design characteristics and the worked out technological regimes. The study was conducted with the aim of obtaining data on the effect of the main parameters of the biogas plant and the heat exchanger-agitator on the quality of its operation. This paper considers the thermal processes taking place in the biogas plant in which the mixing device and the heating element are combined into one unit, which allows heating and maintaining the given temperature regime more evenly due to the rotation of the heat exchanger and the transfer of biomass heat throughout the whole volume of the methane. As a result of theoretical studies of the processes of heat exchange and heat transfer taking place in the biogas plant, a mathematical model has been obtained that allows determining the distribution of the temperature of the biomass throughout the entire volume of the methane. It is established that the theoretical temperature homogeneity of the stirred medium is achieved by combining the heat exchanger and the mixing device into one unit, the design and technological parameters of which characterize the intensity of the forced motion of fermentable manure, while changing the value of thermal conductivity.

THE REGULARITY OF SOLUTIONS FOR THE CURL BOUNDARY PROBLEMS AND GINZBURG-LANDAU SUPERCONDUCTIVITY MODEL

1995 ◽  
Vol 05 (04) ◽  
pp. 529-542 ◽  
Author(s):  
JIN LIANG
Keyword(s):  
Regularity Of Solutions ◽  
Parabolic Problems ◽  
Ginzburg Landau ◽  
Boundary Problems ◽  
The Given

In this paper, we discuss the regularity of solutions for curl boundary elliptic and parabolic problems and related Ginzburg-Landau superconductivity models. The solutions are smooth up to C∞ if the boundary and the given data are smooth enough.

Vibration and Experimental Comparison of Machining Process

2015 ◽  
Vol 669 ◽  
pp. 179-186 ◽  
Author(s):  
Anton Panda ◽  
Marek Prislupčák ◽  
Jozef Jurko ◽  
Iveta Pandová ◽  
Peter Orendáč
Keyword(s):  
Water Jet ◽  
Machining Process ◽  
Experimental Comparison ◽  
Abrasive Water Jet ◽  
Technological Parameters ◽  
Microsoft Excel ◽  
Frequency Spectra ◽  
Acceleration Amplitude ◽  
The Impact ◽  
The Given

Abrasive water jet technology is among the unconventional ways of machining. In today's modern and progressive era is often used for cutting and machining of various types of materials because of lower costs and environmental impact, as the cutting tool is water, in our case, with the addition of abrasives. Objective of the measurements was to evaluate the impact of vibration on the technological head in abrasive water jet technology in changing the selected technological parameters and the flow rate of technological head. In the given experiment, the used material - steel Hardox 500 with a thickness of 10 mm. The effort was to investigate the effects of changes in the speed rate of technological head (by speeds - 40, 200, 400 mm / min) on the size of the vibration acceleration amplitude and its frequency. Based on the measured values ​​of vibration to the technological head create the database and from it is evaluated the data in selected softwares (LabVIEW, SignalExpress and Microsoft Excel). Findings and conclusions are formulated on the basis of graphical dependencies, envelopes frequency spectra and comparison chart of envelopes.

scholarly journals Improvement of the assortment to optimize grape production technology in the Anapo-Taman zone

2021 ◽  
pp. 120-124
Author(s):  
Л.П. Трошин ◽  
Р.В. Кравченко ◽  
Н.В. Матузок ◽  
Р.Н. Куфанова
Keyword(s):  
Growing Season ◽  
Climatic Conditions ◽  
Technological Parameters ◽  
Planting Pattern ◽  
Piedmont Zone ◽  
Table Grapes ◽  
Early Ripening ◽  
High Head ◽  
Grape Varieties ◽  
The Given

Дан обзор результатов ампелографической оценки перспективных розовоягодных сортов винограда Анюта, Аркадия розовая, Виктор, Памяти хирурга в условиях Анапо-Таманской зоны Краснодарского края. Агротехника соответствовала общепринятой для данной культуры и зоны. Схема посадки - 3,0 х 2,5 м. Кусты формировались по типу высокоштамбового двуплечего горизонтального кордона. Все агробиологические учеты проводились по общепринятым методикам. На кустах формировалась одинаковая нагрузка побегами и гроздями. Анализ метеорологических условий периода вегетации, агробиологических и хозяйственно-технологических показателей изучаемых сортов свидетельствует о том, что почвенно-климатические условия Анапо-Таманской зоны Краснодарского края являются благоприятными для их возделывания в неукрывной культуре. Сорта Виктор и Аркадия розовая были отнесены к группе сортов очень раннего срока созревания, сорт Памяти хирурга - раннего, а сорт Анюта - к группе сортов среднепозднего срока созревания. Суммирование рангов сортов по признакам позволяет классифицировать их по комплексной ценности (в убывающем порядке ряда): Виктор, Анюта, Аркадия розовая и Памяти хирурга. В конце ряда - контрольный сорт Кишмиш лучистый. То есть все сорта народной селекции по комплексу биолого-хозяйственных признаков превосходят контрольный сорт и потому их следует рассмотреть как перспективные для районирования в Южно-Предгорной зоне Краснодарского края. Анализ результатов исследований показал, что для производства свежего столового винограда в условиях Анапо-Таманской зоны Краснодарского края в неукрывной культуре рекомендуется выращивание выделившихся по комплексу биолого-хозяйственных признаков сортов Виктор, Памяти хирурга, Аркадия розовая и Анюта. The article provides the summary of results on ampelographic assessment of promising rose-berry grape varieties ‘Anyuta’, Arcadia Rose’, ‘Victor’, ‘Pamyati Khirurga’ in the Anapo-Taman zone of the Krasnodar Territory. Agricultural techniques corresponded to those generally accepted for the given culture and zone. The planting pattern was 3.0 x 2.5 m. The bushes were trained as high-head two-armed horizontal cordons. All agrobiological surveys were carried out according to generally accepted methods. Identical loading with shoots and bunches was trained on the bushes. The analysis of meteorological conditions of the growing season, agrobiological and economic-technological parameters of the studied varieties indicates that the soil and climatic conditions of the Anapo-Taman zone of the Krasnodar Territory are favorable for their cultivation in open-earth culture. The varieties ‘Victor’ and ‘Arcadia Rose’ were attributed to the group of very early ripening varieties, the variety ‘Pamyati Khirurga’ - early, and ‘Anyuta’ - mid-late ripening varieties. Summing-up of varietal ranges according to the characteristics allows classify them according to their complex value (in range in descending order): ‘Victor’, ‘Anyuta’, ‘Arcadia Rose’ and ‘Pamyati Khirurga’. The control variety ‘Kishmish Luchistyi’ is at the end of this range. It means that all varieties selected by local inhabitants are superior to the control variety in terms of the complex of biological and economic characteristics, and therefore they should be considered as promising for zoning in the South Piedmont zone of the Krasnodar Territory. The analysis of the research results showed that in order to produce fresh table grapes in the Anapo-Taman zone of the Krasnodar Territory in open-earth culture, it is recommended to cultivate the varieties ‘Victor’, ‘Pamyati Khirurga’, ‘Arcadia Rose’ and ‘Anyuta’, distinguished by a complex of biological and economic characteristics.

scholarly journals RESEARCH OF THE POSSIBILITY OF INCREASING THE QUALITY OF PREPARATION OF DRY MIXTURES IN A HORIZONTAL VANE MIXER

2021 ◽  
Vol 6 (10) ◽  
pp. 99-108
Author(s):  
S. Khanin ◽  
N. Kikin ◽  
O. Mordovskaya
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Experimental Studies ◽  
Ultimate Compressive Strength ◽  
Regression Equations ◽  
Technological Parameters ◽  
Sand Mixture ◽  
Paddle Mixer ◽  
Mixed Material

Paddle mixers with horizontal shafts are common at building materials enterprises for the preparation of concretes, mortars, dry mortars. A new design of a horizontal paddle mixer with rod elements located in front of the working surfaces of the blades, changing the trajectories of material particles, increasing their mobility, which leads to an increase in the degree of homogeneity of the mixed material, is considered. The aim of the study was to assess the influence of rod elements on the quality of preparation of a cement-sand mixture, to establish patterns of influence on it by the design and technological parameters of a two-shaft paddle mixer and to determine the areas of their rational values. The following tasks have been solved. A bench installation of a two-shaft horizontal paddle mixer with rod elements has been developed, on which experimental studies have been carried out on the preparation of dry cement-sand mixtures. For the criterion characterizing the quality of the mixture, the ultimate compressive strength of the prism specimens made from it is adopted. Regression equations are obtained that adequately describe the compressive strength of prism samples from the design and technological parameters of the mixer: the angle of the blades, the distance from the working surfaces of the blades to the rod elements, the rotational speed of the blade shafts, and their analysis is performed. The analysis of the change in the ultimate compressive strength of the prism specimens from the parameters under study is carried out, the rational ranges of their values are determined. It was found that a mixer with rod elements allows to obtain a dry cement-sand mixture, products from which have a higher compressive strength. During the work, the method of mathematical planning of experiments was used. As a result of the study, an assessment of the influence of rod elements on the quality of preparation of a cement-sand mixture was carried out, the regularities of the influence on it of the design and technological parameters of a two-shaft paddle mixer and the area of their rational values were established.

scholarly journals Determination of technological parameters and tool for flanging holes from sheet blanks

2020 ◽  
Vol 164 ◽  
pp. 14019
Author(s):  
Khaidar Kaderov ◽  
Sergey Kireev ◽  
Marina Korchagina ◽  
Aleksey Lebedev
Keyword(s):  
Technological Development ◽  
Three Dimensional ◽  
Hole Diameter ◽  
Simultaneous Increase ◽  
Technological Parameters ◽  
Cad System ◽  
Dimensional Models ◽  
Three Dimensional Models ◽  
The Given

In the article the parameters of shaping operations of internal axisymmetric cylindrical flanging are considered. The article is written to improve the quality and speed of flanging round holes development from sheet blanks and tooling construction by increasing the accuracy of hole diameter calculation for flanging in the automated mode of building three-dimensional models of workpiece and a flanged product. Given formulas increase the accuracy of hole diameter calculation for flanging, taking into account the deformed condition of the sheet blank. The accuracy of the hole diameter calculation for flanging according to the given formulas is determined by comparing the mass of the workpiece with the mass of the flanged part. CAD system algorithm for automated construction of the flanged parts sketch and determination of technological parameters is implemented. The parameterized scheme of a typical construction of a flanging stamp is presented. The constructed schemes allow making changes in their parameters and providing automatic representation of calculation results and also their correct graphic interpretation. Discussion of the article results allows drawing conclusions about correctness of the given mathematical model and its applicability for the automated construction of three-dimensional models of the flanged details that will allow simplifying technological development and constructed documentation with simultaneous increase of their accuracy and reducing costs of production preparation.

scholarly journals Fundamentals of property and compositions management concrete mix and concrete

2021 ◽  
Vol 264 ◽  
pp. 02061
Author(s):  
Bakhridin Khasanov ◽  
Ruzimurot Choriev ◽  
Nikolai Vatin ◽  
Zukhra Ismailova ◽  
Alisher Tillaev ◽  
...  
Keyword(s):  
Raw Materials ◽  
Laboratory Data ◽  
Physical And Mechanical Properties ◽  
Concrete Mixture ◽  
Normal Density ◽  
Technological Parameters ◽  
Concrete Composition ◽  
Concrete Mix ◽  
Design Characteristics ◽  
The Given

The choice of the concrete composition following the set research tasks must satisfy the following requirements: 1-the maximum achievable strength on the given starting materials; 2-the required formability, corresponding to the accepted vibration-impact-peristaltic pressing; 3-a given level of dehydration of the concrete mixture, providing a residual W/C, close to the normal density of the cement paste. The accepted conditions are necessary and sufficient when using the physical-analytical method of designing concrete composition. Distinctive features of the method are the use of a large amount of information and the absence of arbitrary coefficients, technological constants, or parameters. The necessary data for the assignment of concrete compositions are determined according to the data of preliminary laboratory experiments, the given technological parameters of mechanisms and equipment, and the design characteristics of concrete and the structure to be formed. For the experimental study, a total of six independent information streams of initial data are used: 1-physical and mechanical properties of the constituents of concrete (Rc, ρc, ρc°, [V/C], рс, γ3, ρshch, γsh, γshch°); 2-laboratory data of tests of raw materials in concrete mix and concrete (a, b, c, Ku, A, B); 3-design characteristics of concrete mix and concrete (Rb, F, W, OK, Zh); 4-characteristics of the product to be concreted (V, h, l, μ); 5-technological characteristics of equipment, mechanisms, and devices (th, tb, TO, t0); 6-the cost per unit volume of raw materials (Sc, Cn, Ssh, Se, Sg). Obviously, the listed volume of initial information comprehensively characterizes the materials used and the conditions for forming the product. The previously developed technological conditions for forming concrete pipes, in addition to the above, require, when assigning the composition of concrete, to take into account the observance of the balance of masses in the concrete mixture and compacted, modified concrete. This should be manifested in checking the equation of absolute volumes for the original and compacted (dewatered) concrete.

scholarly journals DEVELOPMENT OF COOPERATIVE AGRO-CREDIT SYSTEM IN GEORGIA

2020 ◽  
pp. 180-184
Author(s):  
PAATA KOGUASHVILI ◽  
DAVID MAMUKELASHVILI
Keyword(s):  
Agricultural Production ◽  
Social Economic ◽  
National Policy ◽  
Entrepreneurial Activity ◽  
Credit System ◽  
National Production ◽  
Economic State ◽  
Production Output ◽  
Social Economic Development ◽  
The Given

The work deals with the progressive system social and economic changes to be implemented in the given historical period in Georgia, which are based on the fundamentally different approaches to the economic policy. This is to lead an intensive rise in the population’s income and in the national production output, mass employment and will ensure the formation of an environment targeted to a long-term development of entrepreneurship. A special role for the social-economic development of a society is ascribed to the use of inclusive forms of entrepreneurship, which conditions, in turn, the necessity of the cooperation sector development – an important component of the modern economy. The cooperation projects proper have the viability and sustainability basis, which, together with economic selfgovernment, is conditioned by the high level of production concentration. Only by mass production (through reduction of prime cost, generation of added value in the uniform production cycle, constant, effective rather than impulsive operation). It would be possible to ensure competitive production and accumulation of a definite part of revenues from its sales for reproduction, without which the economic system development and the spill–over effects could not be achieved. Therefore, cooperation projects have objective bases of real viability and sustainability. The advantage of the given model consists in a complex nature of the main directions, ensuring thus the best conditions for approaching the optimum functioning of enterprises. The future of the Georgian village depends on the correct analysis and assessment of the key problems, without which the establishment of progressive views concerning its development and the working out of relevant projects would be impossible. The finding out of an organizational and legal form, most complying with the social and economic mission of the State in the village most prioritized in terms of the governmental support is of vital importance in the proper policy establishment. The work deals with the impact of agricultural cooperation and cooperative agro credit system on the entrepreneurial development of the population directly engaged in the agricultural sector and agricultural production. It also considers the major grounds for the development of agricultural cooperation in Georgia, describes the current economic state of the local agricultural production and rural population and makes an analysis of the increased migration causes and the organizational setup of agricultural activity. Thanks to analysis of the current social-economic state in Georgia and the experience of the successful countries, it is proved that the entrepreneurial activation of the population is best achievable by an active support of the cooperative sector, which will be directly reflected in the reforms to be implemented in the country regions and by using diverse forms of cooperation will enable mass employment of the population and intensive raising of national production output. A special and irreplaceable role of agricultural cooperation in overcoming rural poverty, in the stepping up of the entrepreneurial activity of the population and in implementing the complex process of forming a healthy middle class has been justified. The legal regulation of the agricultural cooperation process and the industrial regulations represent the main component identifying the organizational form of an agricultural cooperative, because the introduction of these rules proper creates an economic environment, in which a high degree of return of the labour resources of the population directly engaged in the agricultural production rather than the prospects of gaining dividends from the material resources contributed to the share fund represents the factor determining the rural entrepreneurial activity. The industrial regulations of the cooperative system represent the basis for minimizing the production risks, rising economic efficiency, stability and viability. The Georgian village owing to disregard and improper social-economic policy carried out for years has found itself in a very humble state. Under such conditions, the recovery by the complex and dissimilar system without the respective protective mechanisms and support is impracticable. Therefore, the establishment of a qualitatively new policy of inclusive social-economic development in respect to existing circumstances is a must, for which the inside and outside poverty-determining factors should be identified and the mechanisms of overcoming them be worked out. For conducting a viable national policy should be categorically defined that the hard economic standing of the rural population at the current stage is a problem of special urgency and the national policy should be mostly based on the given reality. For this, the special impact of agricultural cooperation and of cooperative agro credit system on the country’s development should be adequately thought out, and the State should, like many developed countries, undertake and fulfil the coordinating, organizing and supporting function of the sustainable and forced development of this system.

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