scholarly journals ANALYSIS OF THE EXISTING ROUTE NETWORK OF THE CITY OF MARHANETS

2021 ◽  
pp. 60
Author(s):  
O. OHAR ◽  
I. BERESTOV ◽  
S. BANTYUKOV ◽  
N. KRUHLOVA
Keyword(s):  
Rational Design ◽  
Assessment Method ◽  
Optimization Criterion ◽  
Practical Significance ◽  
Design Parameters ◽  
Technological Parameters ◽  
Railway Stations ◽  
Route Network ◽  
Technological Assessment ◽  
Technological Evaluation

Purpose. The purpose of the work is to determine the directions for improvement the methods of formation of structures of track development of railway stations and their technical and technological assessment. Method. To determine the areas for improvement the methods of forming structures of track development of railway stations and their technical and technological evaluation, it is necessary to analyze the known scientific approaches, identify their weaknesses and strengths. Based on the analysis of these approaches to develop generalized procedures for the formation of rational structures of track development and evaluation of technical and technological parameters of railway stations. To develop the first procedure, it is necessary to choose the optimization criterion. Results. The paper analyzes the known scientific approaches to the formation of structures of track development of railway stations and their technical and technological evaluation. As a result, it was determined that the most effective way to calculate the design parameters of railway stations is to use automated design procedures, effective ways to calculate technological parameters and evaluate design decisions is to use simulation methods. The generalized procedures of formation of rational designs of track development of railway stations and their technical and technological estimation are offered. Scientific and practical significance. Improved procedures for the formation of rational structures of track development of railway stations and their technical and technological evaluation, which in contrast to the existing ones are based on determining the costs of the railway station with the cumulative total for the calculation period or project life cycle. The implementation of rational design solutions will ensure the implementation of the specified size of train and shunting operations of railway stations with a sufficient reserve of capacity and minimum costs. In addition, the results of technical and technological assessment of track development structures can be the basis for adjusting certain requirements for the construction of station necks.

CLASSIFICATION OF TWO-DISC COULTERS BY TECHNOLOGICAL AND DESIGN PARAMETERS

2021 ◽  
Vol 3 (144) ◽  
pp. 56-63
Author(s):  
Vladimir R. Petrovets ◽  
◽  
Nikolay I. Dudko ◽  
Viktor V. Amelichev ◽  
Vasiliy M. Kuzyur ◽  
...  
Keyword(s):  
Rational Design ◽  
Research Purpose ◽  
Design Parameters ◽  
Structural Elements ◽  
Coding System ◽  
Technological Parameters ◽  
The Matrix ◽  
Working Bodies ◽  
Individual Design

High-quality sowing of grain crops depends on the design of the working bodies of agricultural machines. Based on analytical studies, it was proposed to develop a new classification of individual structural elements of coulters and their technological parameters. (Research purpose) The research purpose is in improvement of the digital classification table of coulter signs, the structure and form of representation of which would allow easily complementing the signs characterizing the studied working body without changing its formation algorithm. (Materials and methods) The coulter can be considered as a system consisting of a combination of individual design and technological features that are closely related to each other. A two-disc coulter was analyzed according to the proposed classification, and a digital coding system was proposed. This classification allows us to include not only the known types of coulters, but also to predict new designs for the specified technologi-cal parameters. (Results and discussion) The features and properties of coulters in the matrix are located vertically and horizontally, respectively, and are considered in in-teraction, coulters of one class are associated with many features and properties of coulters of another class. This classification allows you to replace the existing large classifications with ordinary numbers, to conduct digital coding of any coulters of sowing machines. (Conclusions) The proposed classification allows us to apply digi-tal coding of the entire variety of features and properties of existing and new designs of two-disc coulters, to use computer technologies for searching, storing and pro-cessing information on them. The classification is used to select a rational design of the working body.

scholarly journals Air column of pressure hydrocyclone with pneumatic regulator

2021 ◽  
pp. 4-10
Author(s):  
Yuri Kopanytsia
Keyword(s):  
Solid Phase ◽  
Experimental Studies ◽  
Optimization Criterion ◽  
Design Parameters ◽  
Laboratory Model ◽  
Maximum Effect ◽  
Technological Parameters ◽  
Linear Character ◽  
Column Pressure ◽  
Air Column

A reliable non-contact pneumatic pressure regulator of a pressure hydrocyclone is offered. The regulator is installed in the area of ​​the sand nozzle. The pneumatic regulator of the standard pressure cylindrical-conical hydrocyclone provides non-contact thickening of the product in the area of ​​the sand nozzle. In the process of controlling the operation of the hydrocyclone along its axis, an air column is formed. Features of the regulator affect the formation of the air column of the hydrocyclone. The pressure in the air column is manometric. The task is to investigate the effect of pulp pressure at the inlet of the hydrocyclone, pulp thickening and air column pressure. Experimental studies were performed in the laboratory on a model of a standard industrial cylindrical-conical hydrocyclone HC360. The connection between the technological parameters of the hydrocyclone operation and the pressure in the air column has been studied. to establish possibilities of control of work of a hydrocyclone on pressure in an air column. The planning of the experiment in the laboratory on a hydrocyclone model was performed in the program Statgraphics Centurion XV. Experimental studies were performed for the optimal parameters of the angle and slit of the pneumatic regulator. The optimization criterion is chosen – the maximum effect of pulp thickening while minimizing local energy losses in the nozzle. In laboratory conditions, the change in pulp pressure and density at the inlet of the hydrocyclone over the entire operating range is simulated. The laboratory model of the hydrocyclone was made on a scale of M1:10. Flotation waste was used as pulp. Modeling of hydrocyclone operation as a part of water-sludge system at the concentrator is carried out. The density of the solid phase is 1500 kg/m3. The solids content at the inlet is 10 g/l. Samples were taken by volumetric measurement with a measuring vessel. A statistically significant relationship between the pressure in the air column of the hydrocyclone and the effect of pulp thickening in a standard cylindrical-conical hydrocyclone was established. The presence of the linear character of the dependence of the coefficient of thickening and pressure in the air column of the hydrocyclone with the pneumatic regulator is checked. The absence of a statistically significant effect of hydrocyclone supply pressure on the dependence of other selected factors was established. Experimental studies were carried out at the optimal design parameters of the pneumatic regulator according to the criteria of minimizing the loss of energy of air current in the nozzle and minimizing the volumetric flow of air.

scholarly journals ANALYSIS OF TECHNICAL AND TECHNOLOGICAL PARAMETERS OF UKRAINIAN PRE-PORT RAILWAY STATIONS

2021 ◽  
pp. 36
Author(s):  
O. CHERNOVA ◽  
R. VERNYHORA ◽  
A. OKOROKOV ◽  
A. KIMAN
Keyword(s):  
Effective Interaction ◽  
Throughput Capacity ◽  
Practical Significance ◽  
Technical Equipment ◽  
Technological Parameters ◽  
Scientific Publications ◽  
Sea Transport ◽  
Railway Stations ◽  
Railway Infrastructure ◽  
Low Efficiency

Purpose. The aim of the work is a comprehensive analysis of the technical and technological parameters of pre-port railway stations in Ukraine as key elements of the port infrastructure, ensuring the interaction of railway transport with seaports. Methodology. In the process of research, the methods of analysis and synthesis were used to study the content and the main provisions of scientific publications on the issues of establishing effective interaction between rail and sea transport,  with their subsequent comparison and generalization; methods of statistical analysis for research and systematization of technical equipment of port stations. Results. More than 60% of export cargoes go through Ukrainian ports; while 75% of export volumes are delivered to ports by rail. Currently, due to changes in the conditions for the functioning of the economy and the transport system of Ukraine, there is an imbalance between the capacities of ports and the port railway infrastructure for processing freight flows. Based on the analysis, it was found that the throughput of most stations does not correspond to the prospective, and for some stations - and the actual, volumes of work. In particular, for some stations, the capacity of track development is insufficient; a significant problem is also the low efficiency of the shunting means. An effective way to solve the problem of reducing the imbalance in the processing capacity of ports and the pre-port railway infrastructure is public-private partnership in the implementation of appropriate investment projects, the assessment of which should be carried out using modern scientific approaches. Scientific novelty. The authors have systematized the existing technical equipment of the port stations of Ukraine from the point of view of its sufficiency to ensure the existing and prospective volumes of transportation. Practical significance. The results obtained make it possible to provide a scientific basis for further research into assessing the throughput capacity of pre-port railway stations and the effectiveness of infrastructure projects aimed at increasing it.

scholarly journals Study of efficiency of liquid steel homogenization with blowing through blocks of various designs

2018 ◽  
pp. 76-80
Author(s):  
L Molchanov ◽  
N Sheremeta ◽  
Y Synehin
Keyword(s):  
Rational Design ◽  
Gas Flow ◽  
Video Recording ◽  
Similarity Criteria ◽  
Practical Significance ◽  
Design Parameters ◽  
Production Cycle ◽  
Metal Bath ◽  
Metal Melt ◽  
Process Gases

At modern metallurgical plants, blowing of steel with process gases is an obligatory component of the production cycle. In this case, it is most difficult to organize the supply of stirring gas through the bottom of a metallurgical unit. In the practice of metallurgical production, blowing units of various designs (slotted, channel and with non-directional porosity) are used to inject process gases under such a scheme. Considering that the influence of the design of the bubbler of the bottom blowing unit on the efficiency of mass transfer in a metal bath has not been studied, the aim of this study was to determine the influence of the design of the blowing unit on the efficiency of homogenization of the metal melt. To achieve this goal, the method of physical water modelling was used, based on a modified π-theorem. In order to obtain adequate results, similarity numbers (homochromicity number, dimensionless volume flow number, linear simplex and density simplex) were defined to describe the process of fluid homogenization, and an experimental installation was built that allows video recording of experiments with high image quality. According to the simulation results, photographs were obtained illustrating the dynamics of changes in the level of liquid homogenization over time (assessed by the indicator redistribution rate in the bath volume) for blowing units of various designs and different gas flow rates. The scientific novelty of the conducted research is the determination of similarity criteria describing the process of homogenization of a metal melt when blowing with an inert gas. The practical significance lies in the proposed innovative design of the blowing unit, for which rational design parameters and necessary and sufficient for rapid homogenization parameters of the blowing were defined.

scholarly journals Theoretical researches of threshing and separation processes of bread mass by the threshing-separating device

2020 ◽  
pp. 60-66
Author(s):  
O.M. Hrytsaka
Keyword(s):  
Mathematical Model ◽  
Rational Design ◽  
Theoretical Research ◽  
Design Parameters ◽  
Technological Parameters ◽  
Separation Processes ◽  
Combine Harvester ◽  
Combine Harvesters ◽  
The Mathematical Model ◽  
Grain Losses

Annotation Purpose. Theoretical researches of increase of efficiency of working processes of threshing, separation of grain mass by combine harvesters by improvement and use of a multi-drum design of the threshing-separating device with rational design and technological parameters of work capable to provide necessary agrotechnical requirements. Methods. In theoretical researches the analysis of interaction of the threshing-separating device with grain mass with use of mathematical modeling of processes of threshing of grain, separation of a rough heap and their estimation is carried out. Results. The mathematical model of the mobile multi-drum thresher modernized as a result of change of settings that allowed to increase efficiency of its work is considered; the dependences of quality on the design parameters of the threshing-separating device during the implementation of technological processes of grain harvesting due to the reduction of the total level of injuries and grain losses are obtained. Conclusions. A mathematical model of improvement of the threshing process, separation of grain mass in the threshing gap of the threshing-separating device was developed, which allowed to obtain the dependences of the influence of structural and technological parameters on the level of threshing and separation. It is established that a significant reserve for improving the process of threshing, separation of grain mass is changes in the settings of threshing drums. Keywords: combine harvester, mathematical model, threshing-separating device, theoretical research, grain harvesting, threshing process.

scholarly journals Geometric Design-based Dimensional Synthesis of a Novel Metamorphic Multi-fingered Hand with Maximal Workspace

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Wei An ◽  
Jun Wei ◽  
Xiaoyu Lu ◽  
Jian S. Dai ◽  
Yanzeng Li
Keyword(s):  
Geometric Design ◽  
Practical Significance ◽  
Design Parameters ◽  
Control Algorithms ◽  
Discretization Method ◽  
Dimensional Synthesis ◽  
Symmetrical Structure ◽  
Design And Optimization ◽  
Total Length

AbstractCurrent research on robotic dexterous hands mainly focuses on designing new finger and palm structures, as well as developing smarter control algorithms. Although the dimensional synthesis of dexterous hands with traditional rigid palms has been carried out, research on the dimensional synthesis of dexterous hands with metamorphic palms remains insufficient. This study investigated the dimensional synthesis of a palm of a novel metamorphic multi-fingered hand, and explored the geometric design for maximizing the precision manipulation workspace. Different indexes were used to value the workspace of the metamorphic hand, and the best proportions between the five links of the palm to obtain the optimal workspace of the metamorphic hand were explored. Based on the fixed total length of the palm member, four nondimensional design parameters that determine the size of the palm were introduced; through the discretization method, the influence of the four design parameters on the workspace of the metamorphic hand with full-actuated fingers and under-actuated fingers was analyzed. Based on the analysis of the metamorphic multi-fingered hand, the symmetrical structure of the palm was designed, resulting in the largest workspace of the multi-fingered hand, and proved that the metamorphic palm has a massive upgrade for the workspace of underactuated fingers. This research contributed to the dimensional synthesis of metamorphic dexterous hands, with practical significance for the design and optimization of novel metamorphic hands.

scholarly journals ON THE ISSUE OF DETERMINING THE CRITICAL CUTTING SPEED OF THE MECHANISM FOR FORMING AND TRIMMING THE FALSE EDGE OF THE DORNIER RAPIER LOOM

2021 ◽  
Vol 53 (3) ◽  
pp. 37-40
Author(s):  
Svitlana V. Bukina ◽  
Tatiana A. Sitnikova
Keyword(s):  
Rational Design ◽  
Mutual Influence ◽  
Cutting Speed ◽  
Design Parameters ◽  
Working Process ◽  
Forming Mechanism ◽  
Rational Design Parameters ◽  
Calculation Results ◽  
Knife Blade ◽  
The Impact

In this paper, an attempt is made to develop a method for determining the critical cutting speed of the threads of the false edge of the edge-forming mechanism of the weaving rapier machine. The proposed calculation method takes into account the impact nature of the cutting process at a critical speed, which allows taking into account the mutual influence of the parameters of the working process and more fully assess the mechanics of this process, in which the intensity of the cutting force and the value of the contact stress take the maximum value. The paper calculates the critical cutting speed for some of the main types of threads used and the parameters of the knife blade. The presented calculation results can be used to select rational design parameters of the knife blade, depending on the type of processed threads, when designing and researching new edge-forming mechanisms on looms.

TOOLS FOR ASSESSING THE COMPETITIVENESS OF A COMMERCIAL ENTERPRISE

2020 ◽  
Vol 10 (9) ◽  
pp. 2047-2061
Author(s):  
I.V. Sibiryatkina ◽  
Keyword(s):  
Weighted Average ◽  
Assessment Method ◽  
Practical Significance ◽  
Expert Assessment ◽  
Complex Coefficient ◽  
Advantages And Disadvantages ◽  
Proposed Model ◽  
Commercial Enterprise ◽  
Business Entities ◽  
Adaptation Model

The article presents the systematization of approaches to assess the enterprises' level of competitiveness. The advantages and disadvantages of the most famous models for assessing the competitiveness of business entities are considered. The identified shortcomings made it possible to form a hypothesis for studying the enterprises' competitiveness, taking into account the industry factor, financial criteria and quality indicators of the enterprise. For the formation of an objective adaptation model for assessing the competitiveness of an enterprise, taking into account its industry specificity, the author's approach to assessing the competitiveness of an enterprise, taking into account industry specifics, based on the relative and qualitative indicators of the enterprise's activities, selected by the expert assessment method, is considered. For trade enterprises, groups of the most significant indicators have been formed that characterize the competitiveness in the areas of observation of the sales of a trade enterprise, its costs, financial position and financial results, for the market share of the trade enterprise, the level of prices for goods, for the level of service of the trade enterprise. The indicators characterizing the level of competitiveness of a trading enterprise are divided into relative critical indicators and a group of qualitative critical indicators, which are included in the calculation of the complex coefficient of enterprise competitiveness model based on the theory of effective competition according to the weighted average arithmetic formula. The article presents the results of approbation of the proposed methodology on the example of the “PAO Magnit” trading enterprise and its trade competitors operating in Voronezh. The obtained results of the author's methodology for assessing the competitiveness of a trading enterprise have practical significance; the proposed model can be adapted according to the criteria for selecting indicators and their quantitative indicator, which contributes to the use of this toolkit in future studies of the competitiveness of trading enterprises.

scholarly journals Deflection Mechanism and Safety Analysis of Coal Mine Shaft in Deep Soil Strata

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Jihuan Han ◽  
Jiuqun Zou ◽  
Chenchen Hu ◽  
Weihao Yang
Keyword(s):  
Coal Mine ◽  
Rational Design ◽  
Coal Pillar ◽  
Design Parameters ◽  
Deep Soil ◽  
Mine Shaft ◽  
Dynamic Prediction ◽  
Probability Integral Method ◽  
Mining Conditions ◽  
Shaft Deflection

The main shaft and auxiliary shaft in the Guotun Coal Mine underwent large deflections, with deflection values of 359 mm and 322 mm, respectively. These two deflections represent the first occurrence of such large vertical shaft deviations in the soil strata in China. The deflection problem has seriously affected the hoisting safety and lining safety and has become a serious impediment to the sustainable production of mines. Therefore, the deflection mechanism must be determined. For this purpose, based on mining subsidence theory, the spatial probability integral method and a more accurate time function were used to establish a model, called 3D dynamic prediction model, for predicting the shaft movement. The formulas for calculating the lining stress caused by coal mining were based on established models. With measured shaft deflection data, the prediction parameters for deep soil strata were calculated on the basis of an inversion analysis. A comparative analysis of measured and calculated deflection values revealed that the reason for shaft deflection in Guotun Coal Mine is the insufficient size of the protection coal pillar (PCP); namely, the design parameters of the PCP in current codes are not applicable to the deep soil strata. As a result, under the asymmetric mining conditions, mining causes the shaft to deflect without damage and under the symmetric mining conditions, mining causes the lining to fracture. The results have an extremely important significance for the prevention and control of shaft deflection, for the rational design of PCP, and for the sustainability of mine production.

A Numerical Investigation of Automobile Environment Through Cooling Period and Condensation

2009 ◽  
Author(s):  
Md. Faisal Kader ◽  
Kang Hyu Goo ◽  
Yong-Du Jun ◽  
Kum-Bae Lee
Keyword(s):  
Fluid Flow ◽  
Initial Period ◽  
Three Dimensional ◽  
Practical Significance ◽  
Scale Model ◽  
Design Parameters ◽  
Experimental Investigations ◽  
Three Dimensional Model ◽  
Cooling Period ◽  
Initial Stage

Understanding the fluid flow and heat transfer characteristics within a vehicle compartment is very important for controlling the effect of major design parameters. Also, adequate visibility through the vehicle windshield over the entire driving period is of paramount practical significance. The numerical solution was done by an operation friendly, fast and accurate CFD code — SC/Tetra with a full scale model of a SM3 car and turbulence was modeled by the standard k-ε equation. Numerical analysis of the three-dimensional model predicts a detailed description of fluid flow and temperature distribution in the passenger compartment and on the inside windshield screen. During the cooling period, the lowest temperature is observed in the lower part of the windshield and in the vicinity of the defroster griller. It was found that the temperature dropped down to a comfortable range almost linearly at the initial stage. The initial period to achieve this comfortable range is dependent on the inlet velocity. Experimental investigations are performed to determine the localized thermal comfort and further validation of the numerical results.

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