scholarly journals Mathematical description typification in the problems of synthesis of optimal controller of foundry technological parameters

2014 ◽  
Vol 1 (4(67)) ◽  
pp. 43
Author(s):  
Дмитрий Александрович Дёмин
Keyword(s):  
Mathematical Description ◽  
Optimal Controller ◽  
Technological Parameters

scholarly journals Mathematical Model of Pressure Formation Process along the Helix Channel Length of Screw Grinder

2020 ◽  
Author(s):  
Valery Pelenko ◽  
Ilkhom Usmanov ◽  
Vyacheslav Pokholchenko ◽  
Irina Smirnova
Keyword(s):  
Energy Consumption ◽  
Mathematical Description ◽  
Analytical Description ◽  
High Energy ◽  
Channel Length ◽  
Operating Conditions ◽  
Technical Equipment ◽  
Mining Equipment ◽  
Technological Parameters ◽  
Total Energy Consumption

The improvement of the technical equipment effectiveness is currently becoming particularly important. This applies not only to large and high-energy-intensive machines, but also to household appliances, the total energy consumption of which often exceeds the energy consumption of the overall equipment. These types of devices include, in particular, grinding and cutting equipment. The mathematical description of the processes carried out on this equipment is generalized and can be extended to a wider class of machines, including waste processing and mining equipment. The technological parameters, the design of screw grinders, and the processes of movement, deformation, extrusion and cutting carried out in them are characterized by a significant number of factors affecting the energy intensity. The main ones are the geometric parameters of the screw, machine’s body, cross knife, grinding plate’s thickness, the number and diameter of holes in it, as well as the product’s physical-mechanical characteristics and operating conditions. The most important for the mathematical description are the zones and processes where the main share of the consumed power is spent. The complexity of their analytical description is due to a simplified consideration of either individual technological zones of grinders’ existing designs, or the use of unreasonable simplifications.

scholarly journals MODELING OF BILATERAL END-FINISHING KINEMATIC CHARACTERISTICS

2020 ◽  
Vol 2020 (7) ◽  
pp. 20-26
Author(s):  
Leonid Vayner
Keyword(s):  
Relative Position ◽  
Mathematical Description ◽  
Computer Experiments ◽  
Kinematic Parameter ◽  
Considerable Extent ◽  
Technological Parameters ◽  
Kinematic Characteristics ◽  
Shape Errors ◽  
Limiting Errors ◽  
Cylindrical Roller

The paper is dedicated to the bilateral end-finishing improvement at the expense of efficient kinematic characteristics realization in parts machined ensuring limiting errors minimization in end surfaces. A systematization of parts rotation experimental characteristics is carried out. It is shown that they may be referred to six basic kinds. There are offered equivalent characteristics of rotation used while grinding modeling and their mathematical description is given. The dependences obtained determine a kinematic parameter of a shaping form in the equation of the surface worked. There is considered an influence of billet rotation characteristics upon shaping and accuracy of frictionless bearing cylindrical roller machining under virtual technological conditions equivalent to industrial. As a result of computer experiments carried out it is defined that dynamics and balance of shape errors and a relative position of end surfaces of the roller to a considerable extent are defined with the kind of realized rotation characteristics. The error sensitivity of a shape and end beating to kinematic characteristics realized and technological parameters must be taken into account during bilateral end-finishing control.

MATHEMATICAL MODELING AND STUDY OF THE GRAIN CLEANING MACHINE SIEVE FRAME OPERATION

2020 ◽  
Vol 60 (1) ◽  
pp. 19-28
Keyword(s):  
Mathematical Modeling ◽  
Technological Process ◽  
Mathematical Description ◽  
Process Model ◽  
Technological Parameters ◽  
Machine Operation ◽  
Nodal Points ◽  
Link Mechanism ◽  
Kinematic Study ◽  
Cleaning Machine

The purpose of this work is a mathematical description of sieve frame structural and technological parameters necessary for the implementation of the technological process model of a grain cleaning machine operation. The paper presents the results of the study of the grain cleaning machine sieve frame operation. A kinematic study of a flat swivel multi-link mechanism of the grain cleaning machine sieve frame was made. The method of determining the coordinates of the sieve frame nodal points was developed to calculate their speed. Structural and technological parameters of the mechanism were also studied.

scholarly journals Modeling of the process of screening of seeds

2017 ◽  
Vol 6 (2) ◽  
pp. 123-129
Author(s):  
Князев ◽  
A. Knyazev ◽  
Бородин ◽  
N. Borodin ◽  
Максименков ◽  
...  
Keyword(s):  
Mathematical Description ◽  
Maximum Efficiency ◽  
Regression Equations ◽  
Technological Parameters ◽  
Promising Direction ◽  
Multi Stage ◽  
The Creation

The article presents a mathematical description of the process of screening of seeds of forest crops based on dimensional criteria in a multi-stage roller separator. The obtained regression equations allowing to determine the optimal constructive-technological parameters of the separator at which maximum efficiency of the process is screening. The creation of a multi-stage roller separator is a promising direction in addressing the issue of screening and preparation of coniferous seeds for sowing in the nursery.

scholarly journals MATHEMATICAL MODELING AND STUDY OF THE GRAIN CLEANING MACHINE SIEVE FRAME OPERATION

2020 ◽  
pp. 19-28 ◽  
Author(s):  
Ildar Badretdinov ◽  
Salavat Mudarisov ◽  
Ramil Lukmanov ◽  
Radik Ibragimov ◽  
Valeri Permyakov ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Technological Process ◽  
Mathematical Description ◽  
Process Model ◽  
Technological Parameters ◽  
Machine Operation ◽  
Nodal Points ◽  
Link Mechanism ◽  
Kinematic Study ◽  
Cleaning Machine

The purpose of this work is a mathematical description of sieve frame structural and technological parameters necessary for the implementation of the technological process model of a grain cleaning machine operation. The paper presents the results of the study of the grain cleaning machine sieve frame operation. A kinematic study of a flat swivel multi-link mechanism of the grain cleaning machine sieve frame was made. The method of determining the coordinates of the sieve frame nodal points was developed to calculate their speed. Structural and technological parameters of the mechanism were also studied.

scholarly journals EMERGENCE OF MECHANICAL SOIL EROSION ON SLOPES AND WAYS TO REDUCE IT

2018 ◽  
Vol 13 (3) ◽  
pp. 96-102 ◽  
Author(s):  
Зиннур Рахимов ◽  
Zinnur Rakhimov ◽  
Салават Мударисов ◽  
Salavat Mudarisov ◽  
Ильдар Рахимов ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Mathematical Description ◽  
Technological Parameters ◽  
Maximum Displacement ◽  
Horizontal Field ◽  
Direction Of Movement ◽  
Mechanical Erosion ◽  
Working Bodies

The work is devoted to the mathematical description of the process of occurrence and flow of mechanical soil erosion on slope fields and ways to reduce it. The dependences of mechanical erosion on the steepness of the slope, the type and parameters of the working unit, the direction of movement of the unit relative to the horizontal field are given. The obtained mathematical dependences allow us to calculate the displacement of the soil down the slope, depending on the type and parameters of the working unit and on the technology of tillage used. Purpose of the study. Reduction of mechanical soil erosion in slope fields by improving technologies and structural and technological parameters of tillage and seeding machines. Calculations showed that when the unit moves at an angle θ = 45 ÷ 70° to the horizontal of the field, the maximum displacement of the soil occurs by the lower wing of the working body (Δ1). Minimal mechanical soil erosion is provided for lancet working bodies when the unit moves relative to the horizontal of the field at an angle of 90 ± 35°, for unilateral working bodies - 120 ± 40°. It is desirable to avoid the direction of movement of the unit θ ≈ 0 ... 70°, when maximum mechanical erosion is observed when processing by one-sided working bodies (plow bodies) exceeding mechanical erosion when moving along the field horizontals 1.5 times.

A possibility of using nickel concentrate, obtained as a result of hydrometallurgical enrichment of manganese-containing raw materials, at steel alloying

2020 ◽  
Vol 76 (7) ◽  
pp. 709-715
Author(s):  
O. Yu. Kichigina
Keyword(s):  
Raw Materials ◽  
Experimental Studies ◽  
Selective Extraction ◽  
Technological Parameters ◽  
Nickel Iron ◽  
Nickel Recovery ◽  
Nickel Concentrate ◽  
Steel Alloying ◽  
High Degree ◽  
Comprehensive Processing

At production of stainless steel expensive alloying elements, containing nickel, are used. To decrease the steel cost, substitution of nickel during steel alloying process by its oxides is an actual task. Results of analysis of thermodynamic and experimental studies of nickel reducing from its oxide presented, as well as methods of nickel oxide obtaining at manganese bearing complex raw materials enrichment and practice of its application during steel alloying. Technology of comprehensive processing of complex manganese-containing raw materials considered, including leaching and selective extraction out of the solution valuable components: manganese, nickel, iron, cobalt and copper. Based on theoretical and experiment studies, a possibility of substitution of metal nickel by concentrates, obtained as a result of hydrometallurgical enrichment, was confirmed. Optimal technological parameters, ensuring high degree of nickel recovery out of the initial raw materials were determined. It was established, that for direct steel alloying it is reasonable to add into the charge pellets, consisting of nickel concentrate and coke fines, that enables to reach the through nickel recovery at a level of 90%. The proposed method of alloying steel by nickel gives a possibility to decrease considerably steel cost at the expense of application of nickel concentrate, obtained out of tails of hydrometallurgical enrichment of manganese-bearing raw materials, which is much cheaper comparing with the metal nickel.

Operation intensification methods of aggressive industrial sewage neutralization facilities

2020 ◽  
Vol 76 (11) ◽  
pp. 1149-1153
Author(s):  
N. S. Tsarev ◽  
V. I. Aksenov ◽  
I. I. Nichkova
Keyword(s):  
Cold Water ◽  
Specific Productivity ◽  
Technological Properties ◽  
Technological Parameters ◽  
Preliminary Heating ◽  
Sediment Treatment ◽  
Circulating Water ◽  
Equipment Operation ◽  
Sediment Volume ◽  
Industrial Sewage

To neutralize the waste pickling solutions and rinsing water, resulting from cleaning metal products s surface of rust by acids solutions, lime is used. Being cheap, this method of sewage neutralization has considerable drawbacks. Forming in the technological pipes strong gypsum depositions and low specific productivity of the equipment for sediment dewatering are most significant of them. Characteristic of aggressive industrial sewage, formed at pickling of ferrous metals presented. Methods of elimination of drawbacks of industrial sewage neutralization by lime considered, including stabilization of neutralized industrial sewage and control of properties of the sediment formed. It was noted, that stability of the circulating water can be provided by accelerating of crystallization of the forming gypsum sediments by introducing in it fine priming powder and heating the neutralized water up to 65-70 °С followed by thermal softening of a part of circulating water, removed out of the circulating system. It was shown, that the heating of the water and the ongoing changes of the composition and properties of the sediment result in decrease of filtration resistance 2-3 folds, increase of deposition speed 3-4 folds and decrease the sediment volume 1.5-2 folds comparing with lime neutralization in cold water. Calculated dozes of lime at the heating were taken the same as at the regular lime neutralization. Elimination of the circulating water oversaturation by bi-water gypsum can be reached also by addition into the water of powder-like gypsum pulp - priming powder for microcrystals of the gypsum, followed by aeration during 30-40 min. This method was tested under industrial conditions. Technological properties of the forming sediment can be improved by sediment treatment by flocculants and preliminary heating of the neutralized water up to 65-70 °С. Control of technological properties of the sediment is done by addition of flocculants and heating of the neutralized water. Recommendations for improving operation of the neutralization facilities presented with indicating particular technological parameters of the equipment operation for sewage and sediment treatment. 

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