Mathematical Modeling of Technological Parameters of The Work of Bucket Wheel Excavators

2018 ◽  
Author(s):  
Ahmet Bytyçi ◽  
Nexhmi Krasniqi ◽  
Hazir Qadraku
Keyword(s):  
Mathematical Modeling ◽  
Technological Parameters

scholarly journals Simulation of Diffusion Processes in Chemical and Thermal Processing of Machine Parts

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 698
Author(s):  
Kateryna Kostyk ◽  
Michal Hatala ◽  
Viktoriia Kostyk ◽  
Vitalii Ivanov ◽  
Ivan Pavlenko ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Temperature Distribution ◽  
Thermal Treatment ◽  
Diffusion Processes ◽  
Nitrogen Concentration ◽  
The Body ◽  
Functional Dependencies ◽  
Technological Parameters ◽  
Gas Nitriding ◽  
Temperature State

To solve a number of technological issues, it is advisable to use mathematical modeling, which will allow us to obtain the dependences of the influence of the technological parameters of chemical and thermal treatment processes on forming the depth of the diffusion layers of steels and alloys. The paper presents mathematical modeling of diffusion processes based on the existing chemical and thermal treatment of steel parts. Mathematical modeling is considered on the example of 38Cr2MoAl steel after gas nitriding. The gas nitriding technology was carried out at different temperatures for a duration of 20, 50, and 80 h in the SSHAM-12.12/7 electric furnace. When modeling the diffusion processes of surface hardening of parts in general, providing a specifically given distribution of nitrogen concentration over the diffusion layer’s depth from the product’s surface was solved. The model of the diffusion stage is used under the following assumptions: The diffusion coefficient of the saturating element primarily depends on temperature changes; the metal surface is instantly saturated to equilibrium concentrations with the saturating atmosphere; the surface layer and the entire product are heated unevenly, that is, the product temperature is a function of time and coordinates. Having satisfied the limit, initial, and boundary conditions, the temperature distribution equations over the diffusion layer’s depth were obtained. The final determination of the temperature was solved by an iterative method. Mathematical modeling allowed us to get functional dependencies for calculating the temperature distribution over the depth of the layer and studying the influence of various factors on the body’s temperature state of the body.

Mathematical Modeling of the Test Process of Construction Materials

2019 ◽  
Vol 828 ◽  
pp. 115-120 ◽  
Author(s):  
Narine Pirumyan ◽  
Mihran Stakyan ◽  
Gagik Galstyan
Keyword(s):  
Mathematical Modeling ◽  
Building Materials ◽  
Computational Algorithm ◽  
Least Squares Method ◽  
Construction Materials ◽  
Building Structures ◽  
Technological Parameters ◽  
Processing Data ◽  
Optimization Principle ◽  
Test Process

A mathematical model has been proposed for processing data from tests of building materials and obtaining optimal links between the characteristics of the bearing capacity and technological parameters of building materials for the use of these connections in refined design and construction procedures for building structures. To improve the accuracy of the results obtained, a three-level optimization principle was applied using the least squares method and a computational algorithm was compiled that allows us to develop an additional computational subroutine expanding the capabilities of the corresponding standard computer programs.

A Study on Mathematical Modeling Technology for Magnetic-Fluid Grinding

2011 ◽  
Vol 335-336 ◽  
pp. 406-410
Author(s):  
Shu Qin Wu ◽  
Yao Ming Li
Keyword(s):  
Mathematical Modeling ◽  
Magnetic Field ◽  
Magnetic Fluid ◽  
Work Piece ◽  
Technological Parameters ◽  
Si3n4 Ceramic ◽  
Working Mechanism ◽  
Modeling Technology ◽  
Magnetic Center ◽  
Grinding Time

The paper introduces the precision processing technology of grinding using magnetic fluid and presents the working mechanism of magnetic-fluid grinding. Based on Preston Equation, it also establishes a mathematical modeling for magnetic-fluid grinding, which is used to study the relationships between the effects of grinding and the variation of such technological parameters as the revolving speed of work-piece, the intensity of magnetic field, the distance between work-piece surface and magnetic center, the size of the magnetic fluid and grinding time, etc. Analysis on the grinding of Si3N4 ceramic-balls proves that the model has been well established.

scholarly journals Mathematical modeling of processes of interaction of functional and which contaminate microorganisms in biotechnology system

2019 ◽  
Vol 81 (1) ◽  
pp. 252-255
Author(s):  
A. V. Skrypnikov ◽  
E. V. Belokurova ◽  
N. V. Sotnikov
Keyword(s):  
Mathematical Modeling ◽  
System Analysis ◽  
System Model ◽  
Microbial Populations ◽  
Simultaneous Occurrence ◽  
Technological Parameters ◽  
Microbiological Processes ◽  
Microbiological Process ◽  
Common Resource

Mathematical modeling of processes occurring in the biotechnological system, including those describing the interaction of functional microorganisms with contaminating microflora, is currently a promising scientific direction. The article discusses the issues of system analysis of the processes occurring in the biotechnological system during fermentation. By "microbiological system" is meant a microbiological process consisting of two subsystems or populations of microorganisms. During a given technological process, these populations interact with each other by using a common resource. Systems analysis and mathematical modeling of microbiological processes is a complex task. It is necessary to take into account a lot of factors, such as the simultaneous occurrence of several non-stationary processes; many state parameters, including analysis of the links between them; change in real time of technological parameters, in particular, the main resource, consideration of various properties of microbial populations affecting the behavior of microbiological systems (mortality, fertility, the existence of extraneous microflora, etc.), and other factors that have a direct impact on the quality of the finished product. In turn, a quantitative analysis of these interactions will lead to the development of scientifically based methods and approaches that minimize the effect of contamination. The analysis was carried out and a system model was constructed reflecting the entire spectrum of interactions between useful and extraneous populations of microorganisms in the production of bakery products. The presented system model allows to continue the study of the questions posed in the work, by further studying its components.

scholarly journals Study of the process of preparing feeding mixtures using the composite mixer

2018 ◽  
Vol 5 (1) ◽  
pp. 17-22 ◽  
Author(s):  
M. Chernovol ◽  
M. Sviren ◽  
R. Kisiliov
Keyword(s):  
Mathematical Modeling ◽  
Slope Angle ◽  
Mixing Process ◽  
Solid Mass ◽  
Technological Parameters ◽  
Effi Ciency ◽  
Paddle Mixer ◽  
Working Bodies ◽  
The Impact ◽  
The Mathematical Model

Aim. Enhancing the quality and improving the technological process of mixing feeds using the new con- struction of the mixer and substantiating its rational parameters. Methods. Mathematical modeling theories, fundamentals of using machinery in animal breeding. Results. The estimated model of the functioning of a constructive-technological scheme of a composite mixer and the mathematical model of the dynamic interac- tion of mixer paddles and the solid mass of feeds were elaborated. It was established that the technological effi ciency of preparing the homogeneous mixture depends on physical and mechanic properties of its compo- nents, the impact and interaction between the form and geometric parameters of the attacking surface of the paddles, the slope angle, the setting increment and working modes of the mixer. Conclusions. The results of the studies confi rm the possibility of enhancing the effi ciency of the technology of preparing completely balanced feeding mixtures for cattle via the intensifi cation of the mixing process using the construction of the composite belt-paddle mixer, the elaboration of theoretical fundamentals of the interaction of feed components with the working bodies and substantiating their main constructive and technological parameters.

Mathematical Modeling and Optimization of Fluidized Layer Carbonitriding Process for 1C 25 Steel

2017 ◽  
Vol 1143 ◽  
pp. 180-187
Author(s):  
Marian Iulian Neacsu ◽  
Sorin Dobrovici
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Software Package ◽  
Order Equation ◽  
Graphical Interface ◽  
Technological Parameters ◽  
Fluidized Layer ◽  
The Mathematical Model ◽  
Hardness Values ◽  
Temperature Depth

This paper presents the experiment-based mathematical modelling of fluidized bed carbonitriding process for 1C 25 steel meant to optimize this type of thermochemical processing.Based on experimental results, the mathematical model was developed, which is a second order equation with three unknown terms (parameters): temperature, depth of carbonitrided layer, the percentage of ammonia.The mathematical model allowed the simulation of the fluidized layer carbonitriding process according to its parameters and the thermal energy optimization for obtaining HV hardness values in the range 300-400 MPa.Using the software package Matlab a graphical interface was done, through which all the combinations of technological parameters of the carbonitriding process are determined, leading to obtaining values of microhardness between 300 and 400 MPa, as well as the amount of energy consumed for each variant. The variant consuming the lowest energy is considered optimal.

scholarly journals Mathematical modeling of the main technological parameters of the two-rotor shock-centrifugal disintegrator on the basis of correlation analysis

2019 ◽  
Vol 109 ◽  
pp. 00060 ◽  
Author(s):  
Volodymyr Nadutyi ◽  
Anastasiia Loginova ◽  
Vitalii Sukhariev
Keyword(s):  
Mathematical Modeling ◽  
Kinetic Energy ◽  
Correlation Analysis ◽  
Power Consumption ◽  
Multiple Regression ◽  
Structural Parameters ◽  
Kinematic Scheme ◽  
Technological Parameters ◽  
Different Types ◽  
Combined Action

Technological disintegration indicators (productivity and power consumption) were determined and their generalized multiple regression variability depending on the regime and structural parameters of the shock-centrifugal disintegrator and the parameters of the output product were obtained. Economic and technological advantages of using the two-rotation kinematic scheme of a shock-centrifugal disintegrator, which implements the destruction of the material mainly by shock shifts due to the combined action of the kinetic energy of the interconnected flows, were justified. The research was carried out using such types of rocks: granite, tuff, limestone, basalt. The nature of the dependencies was determined by comparing the corresponding values of the reliability of different types of approximation.

scholarly journals RESEARCH OF THE CUTTING MECHANISM AT ELECTRICAL DISCHARGE GRINDING

2021 ◽  
pp. 37-44
Author(s):  
Roman Strelchuk ◽  
Oleksandr Shelkovyi
Keyword(s):  
Mathematical Modeling ◽  
Electrical Discharge ◽  
Geometric Modeling ◽  
Functional Dependence ◽  
Hard Alloys ◽  
Technological Parameters ◽  
Cutting Mechanism ◽  
Modes Of Processing

The paper presents the results of a study of the cutting mechanism during electrical discharge grinding of hard alloys. The cutting mechanism during electrical discharge grinding was studied using mathematical modeling. By means of geometric modeling, a method of grinding cup wear was developed. The functional dependence of the diamonds use factor in the Kw wheel on the technological parameters of processing, wear and tool characteristics were determined. Analysis of the results of the study shows that an increase in efficiency at electrical discharge grinding can be achieved by reducing the wear of S, and by corresponding variation in the concentration of diamonds and technological modes of processing.

scholarly journals Development and improvement of lost foam casting technology based on mathematical modeling

2018 ◽  
Vol 224 ◽  
pp. 01025 ◽  
Author(s):  
Nikolay Nesterov ◽  
Boris Vorontsov
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Detailed Analysis ◽  
Low Frequency ◽  
Lost Foam Casting ◽  
Technological Parameters ◽  
Optimum Range ◽  
Casting Technology ◽  
Low Frequency Oscillations ◽  
Lost Foam

A detailed analysis of the process of filling the mould for lost foam casting technology was made based on a mathematical model, that takes into account the emergence of low-frequency oscillations. The optimum range of technological parameters for a few specific details were discovered. The factors that may lead to the release of metal and to mould collapse were also identified.

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