MATHEMATICAL MODEL FOR DETERMINING THE WORKING PARAMETERS AND MODES OF THE FUNCTIONING OF THE INFORMATION TECHNICAL SYSTEM

2018 ◽  
Vol 8 (2) ◽  
Author(s):  
O. Brovarets ◽  
Keyword(s):  
Mathematical Model ◽  
Technical System ◽  
Working Parameters

Vibration Analysis of a Vertical Roller Mill: Modeling and Validation

2014 ◽  
Author(s):  
Engin H. Çopur ◽  
Metin U. Salamci ◽  
Selahattin Gülbeyaz
Keyword(s):  
Mathematical Model ◽  
Vibration Analysis ◽  
Compressive Force ◽  
Vibration Characteristics ◽  
Physical Parameters ◽  
Roller Mill ◽  
Vibration Tests ◽  
Working Parameters ◽  
The Mathematical Model ◽  
Vertical Roller

In this paper, vibration characteristics of a Vertical Roller Mill (VRM) are studied by using physical parameters of an operating VRM. The mathematical model is derived and simulated for a set of working parameters. Mechanical properties of the grinding material and the physical properties of the mechanical construction are used in the vibration model in order to obtain more realistic results. Simulation results are presented which give critical frequencies of the VRM. The effects of the hydraulic compressive force to the vibration characteristics are investigated. The effects of the material feeding rate (which affects the mineral thickness to be grinded) to the vibration characteristics are also simulated. In order to validate the mathematical model, a set of experimental vibration tests are performed on the VRM. Vibrations are measured during the run-down procedure of the VRM in order to determine natural frequencies of the mill as well as excitation frequencies of the system. The measurements showed the validity of the proposed mathematical model for the vibration analysis of the VRM.

scholarly journals Mathematical Model of Reliability of Restored Technical System

2017 ◽  
Vol 2 (1) ◽  
pp. 23-26
Author(s):  
Razi J. Al-Azawi ◽  
Raid S. Jawad ◽  
A. Kadhem
Keyword(s):  
Mathematical Model ◽  
Technical System

scholarly journals MATHEMATICAL MODEL OF A TECHNICAL SYSTEM

2018 ◽  
Vol 58 (02) ◽  
pp. 1-4
Author(s):  
Gennady Evgenievich Markelov ◽  
Keyword(s):  
Mathematical Model ◽  
Technical System

ТЕОРЕТИЧЕСКИЕ И ТЕХНИКО-ТЕХНОЛОГИЧЕСКИЕ ОСНОВЫ КОМПЛЕКСНОГО РЕГУЛИРОВАНИЯ ГИДРОТЕРМИЧЕСКОГО РЕЖИМА АГРОФИТОЦЕНОЗА В УСЛОВИЯХ ОРОШЕНИЯ

2020 ◽  
pp. 9
Author(s):  
V.V. Borodychev ◽  
M.N. Lytov
Keyword(s):  
Mathematical Model ◽  
Automatic Control ◽  
Experimental Studies ◽  
Technical System ◽  
Irrigation Systems ◽  
Row Crops ◽  
Hydrothermal Regime ◽  
Climate Risks ◽  
Integrated Regulation ◽  
Climatic Risks

Актуальность исследований определяется преимуществами комплексного регулирования гидротермического режима агрофитоценоза и проекции посевов от климатических рисков, реализуемых на базе единой технической системы с автоматическим управлением. Цель исследований разработать теоретические и технико-технологические основы комплексного регулирования гидротермического режима агрофитоценоза в условиях орошения. Исследованиями разработана укрупненная модель формирования гидротермического режима агрофитоценоза в условиях орошения, предложена система сенсоров и критериев управления гидротермическим режимом агрофитоценоза, разработан концепт математической модели формирования гидротермического режима агрофитоценоза с регуляторами на основе взаимосвязанного решения задач тепло- и водообмена в системе, обоснована система перспективных технико-технологических решений в области регулирования гидротермического режима агрофитоценоза и комплексной защиты посевов от климатических рисков. Модельные и экспериментальные исследования эффективности предложенных технико-технологических решений подтвердили приоритет комбинированных стационарных систем орошения для однолетних пропашных культур и многолетних насаждений.The relevance of research is determined by the benefits of comprehensive regulation of the hydrothermal regime of agrophytocenosis and the projection of crops from climatic risks, implemented on the basis of a single technical system with automatic control. The purpose of the research is to develop theoretical and technical-technological foundations for the integrated regulation of the hydrothermal regime of agrophytocenosis under irrigation conditions. Studies have developed an enlarged model for the formation of the hydrothermal regime of agrophytocenosis under irrigation conditions, proposed a system of sensors and criteria for controlling the hydrothermal regime of agrophytocenosis, developed a concept for a mathematical model of the formation of the hydrothermal regime of agrophytocenosis with regulators based on the interconnected solution of heat and water exchange problems in the system, justified a system of promising technical and technological decisions in the field of regulation of the hydrothermal regime of agrophytocenosis and comp eksnoy protect crops against climate risks. Model and experimental studies of the effectiveness of the proposed technical and technological solutions have confirmed the priority of combined stationary irrigation systems for annual row crops and perennial plantings.

MODELING AND ENVIRONMENTAL-ECONOMICAL EVAL UA TION OF GEOTECHNICAL STRATEGY FOR THE MINING OF TRANSITION AREAS OF ORE DEPOSITS

2020 ◽  
Vol 2 (1) ◽  
pp. 153-167
Author(s):  
I.V. SOKOLOV ◽  
◽  
I.V. NIKITIN ◽  
Y.M. SOLOMEIN ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Computer Program ◽  
Ore Deposits ◽  
Technical System ◽  
Mining Method ◽  
Mining System ◽  
System Method ◽  
Evaluation Algorithm ◽  
Transition Areas ◽  
Utilization Of Wastes

The economic-mathematical model of geotechnological strategy for the mining of transition areas at the consecutive scheme of the combined mining of ore deposits, representing a set of the methods for determining the parameters and indicators of the mining technical system, the evaluation algorithm and the corresponding computer program, was created. In the result of modeling the developed options of geotechnical strategy with different the condition of quarry, sequence of mining, method and scheme of opening, mining system, method of isolation goaf from quarry, method of utilization of wastes from mining and mineral processing, the optimal option was selected on proposed complex environmental and economical criterion.

scholarly journals Numerical analysis of heat transfer in air-water heat exchanger with microchannel coil

2019 ◽  
Vol 95 ◽  
pp. 02004
Author(s):  
Vladimir Glazar ◽  
Anica Trp ◽  
Kristian Lenic ◽  
Fran Torbarina
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Fluid Flow ◽  
Heat Exchanger ◽  
Numerical Analysis ◽  
Flow Direction ◽  
Heat Fluxes ◽  
Experimental Investigations ◽  
Flow And Heat Transfer ◽  
Working Parameters

This paper presents numerical analysis of fluid flow and heat transfer in the heat exchanger with microchannel coil (MCHX). In accordance with previously published experimental results, 3D mathematical model has been defined and appropriate numerical simulation of heat transfer has been performed. Geometry and working parameters of cross-flow air-water heat exchanger with microchannel coil, installed in an open circuit wind tunnel and used in experimental investigations, have been applied in numerical analysis in order to validate the mathematical model. 3D model with air and water fluid flow and heat transfer domains has been used, as it gives more precise results compared to models that assume constant temperatures or constant heat fluxes on the pipe walls. Developed model comprised full length of air and water flows in the heat exchanger. Due to limitations of computational capacity, domain has been divided in multiple computational blocks in the water flow direction and then solved successively using CFD solver Fluent. Good agreement between experimentally measured and numerically calculated results has been obtained. The influence of various working parameters on heat transfer in air-water heat exchanger has been studied numerically, followed with discussion and final conclusions.

scholarly journals A WORKING MATHEMATICAL MODEL OF A TECHNICAL SYSTEM ELEMENT

2019 ◽  
Vol 69 (01) ◽  
pp. 52-55
Author(s):  
Gennady Evgenievich Markelov ◽  
Keyword(s):  
Mathematical Model ◽  
Technical System ◽  
System Element

scholarly journals MATHEMATICAL MODEL OF A TECHNICAL SYSTEM ELEMENT

2018 ◽  
Vol 57 (01) ◽  
pp. 111-113
Author(s):  
Gennady Evgenievich Markelov ◽  
Keyword(s):  
Mathematical Model ◽  
Technical System ◽  
System Element
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