MATHEMATICAL MODEL OF CONTROL OF RELIABILITY OF A TECHNICAL SYSTEM DURING THE DEVELOPMENT PHASE WITH APPLICATION OF THE MODIFIED METHOD OF SHORTEST DESCENT

2019 ◽  
pp. 74-84
Author(s):  
Y. N. Makarov ◽  
◽  
V. D. Babishin ◽  
N. S. Kulish ◽  
M. Y. Parfenova ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Technical System ◽  
Development Phase ◽  
Modified Method

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.

Methodical Approaches to Describe and Evaluate Uncertainty in the Transmission Behavior of a Sensory Rod

2015 ◽  
Vol 807 ◽  
pp. 205-217
Author(s):  
Christiane Marianne Melzer ◽  
Martin Krech ◽  
Lisa Kristl ◽  
Tillmann Freund ◽  
Anja Kuttich ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Electrical Properties ◽  
Development Phase ◽  
Electrical Transmission ◽  
Young’S Moduli ◽  
Mechanical And Electrical Properties ◽  
Load Carrying ◽  
Piezoelectric Charge

Load carrying mechanical structures like trusses face uncertainty in loading along with uncertainty in their strength due to uncertainty in the development, production and usage. The uncertainty in production of function integrated rods is investigated, which allows monitoring of load and condition variations that are present in the product in every phase of its lifetime. Due to fluctuations of the semi-finished parts, uncertainty in governing geometrical, mechanical and electrical properties such as Young's moduli, lengths and piezoelectric charge constants has to be evaluated. The authors compare the different direct methodical approaches Monte-Carlo simulation, fuzzy and interval arithmetic to describe and to evaluate this uncertainty in the development phase of a simplified, linear mathematical model of a sensory rod in a consistent way. The criterion to compare the methodical approaches for uncertainty analysis is the uncertain mechanical-electrical transmission behavior of the sensory rod, which defines the sensitivity of the sensory compound.

scholarly journals Acoustic Velocity Correcting Method for the Tilted Acoustic Tube in Testing of Pile by Ultrasonic Transmission

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Yongqiang Cui ◽  
Zhitao Ma ◽  
Yachao Yang ◽  
Daifu Song
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Finite Element ◽  
Acoustic Signal ◽  
Acoustic Velocity ◽  
Normal Value ◽  
Finite Element Software ◽  
Modified Method ◽  
The Mathematical Model ◽  
Depth Curve

The finite element software ABAQUS was used to simulate the detection of piles by ultrasonic transmission. The influence of the tilted acoustic tube on the testing results of the pile was analyzed. The results showed that, when the pile was complete, the velocity of the sound-depth curve of the received signal was inclined to one side due to the inclination of the acoustic tube and the velocity of the sound seriously deviated from the normal value; when there was a defect in the pile, the signal of the defect was not obvious due to the tilt of the acoustic tube, which was easy to miss or misjudge the defects of the pile. To solve the problem of the inclined acoustic tube, the mathematical model of the position relation of the acoustic tube was established, and the method for correcting the velocity of the sound based on the angle of the acoustic tube was derived. Numerical simulation and engineering examples were used to verify the modified method; the verification showed that the corrected acoustic signal could accurately determine the defects and their positions in the pile, and this method effectively reduced the influence of the tilted acoustic tube on the detection signal, which was beneficial to improve the accuracy of the testing for the pile.

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 LINGVISTIC APPROACH IN THE PROJECT MANAGEMENT SYSTEM BASED ON AN ANALYSIS OF THE CONDITIONS FOR THE ADOPTION OF ALTERNATIVE SOLUTIONS

2018 ◽  
pp. 23-31
Author(s):  
V. Yuzevych ◽  
N. Krap ◽  
O. Ogirko
Keyword(s):  
Mathematical Model ◽  
Project Management ◽  
Membership Function ◽  
Management System ◽  
Optimal Number ◽  
Project Management System ◽  
Modified Method ◽  
Optimal Value ◽  
Travel Agencies ◽  
Alternative Solutions

The article deals with the task model based on an analysis of the conditions for the adoption of alternative solutions. Using such model in the project management allows evaluating the existing number of tourists by countries of destination and choosing the the best option. A modified method of undominated alternatives was used for analysis of the subjects of tourism in Lviv region. The concepts of membership function and the degree of fuzziness on the project were proposed. Mathematical model allowing to select the optimal value of tourists served by subjects of tourism in Lviv region by country of destination was developed. On the basis of data on the distribution of citizens of Ukraine, serviced by subjects of tourism in Lviv region by country of destination the country with the optimal number of served tourists was determined. Using a modified method of undominated alternatives in the system of project management helps to optimize the work of travel agencies and describes the development of tourism in a given area of research.

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