scholarly journals DETERMINATION OF CHARACTERISTICS AND SMOKE EXHAUSTERS PARAMETERS IN CONDITIONS OF INDEPENDED AND JOINT WORK WITH OTHER DEVICES BASED ON MATHEMATICAL MODEL

2018 ◽  
Vol 1 (2) ◽  
pp. 10-17
Author(s):  
A Kodryk ◽  
O Titenko ◽  
V Prysiazhniuk ◽  
S Semychaievskyi
Keyword(s):  
Mathematical Model ◽  
Aerodynamic Resistance ◽  
Exhaust System ◽  
Axially Symmetric ◽  
Axial Fan ◽  
Joint Work ◽  
Mixture Flow ◽  
Operating Modes ◽  
Table Data ◽  
Independent Work

The principle of construction and examples of implementation of the developed mathematical model of the smoke exhaust system designed for operational use in case of fire for the elimination of gas pollution and lowering the temperature in the premises. Estimated target features of the installation are based on existing experience, namely: expected aerodynamic airway resistance: 80 Pa and volumetric air mixture flow rate of 3.3 m3/s. The specified characteristics and parameters necessary for the design, or modernization of existing axial fans, and their choice for three operating modes: independent work, joint work with the supply of finely divided water, joint work with the foam generating plant. Simplifications were used in the development of a mathematical model: scheme of the design of the axial fan, which does not involve the presence of a guiding apparatus; it is assumed that the flow in the operating cavity of the pump is axially symmetric; it is assumed that the thermodynamic process taking place in the pump cavity is isothermal; simplified formula of the lifting factor and drag coefficient of the grid is used on the basis of known table data. The mathematical model takes into account: the dimensions of the smoke exhaust system, the number and size of the blades, the angle of attack of the blade, the frequency of rotation, the amount of aerodynamic resistance of the airway, the density and the amount of supply of finely divided water or foam. The examples of the implementation of the developed mathematical model of the smoke exhaust system are illustrated in the form of diagrams of the location of the working points (volume flow of air mixture, m3/s, pressure, Pa; power of the engine of the smoke exhaust system, W) at operation of a smoke exhaust system in the conditions of the average airway for the three above-mentioned operating modes.

scholarly journals The method of dynamic operating modes investigation in electrohydraulic drive systems with improved accuracy of positioning executive elements

2018 ◽  
Vol 226 ◽  
pp. 04024
Author(s):  
Valeriy V. Grechikhin ◽  
Galina A. Galka ◽  
Anatoliy I. Ozerskiy ◽  
Mikhail E. Shoshiashvili
Keyword(s):  
Mutual Influence ◽  
Hydraulic Drive ◽  
Joint Work ◽  
Operating Modes ◽  
Hydraulic Machines ◽  
Dynamic Operating ◽  
Electrohydraulic Drive ◽  
Drive Systems ◽  
Improved Accuracy ◽  
Executive Elements

The article describes the method of dynamic operating modes investigation in electrohydraulic drive systems with improved accuracy of positioning output element. The method is the evolution of the fundamental positions of the mechanics of continuous media with moving boundaries as applied to the research of non-stationary processes accompanying the operation of hydraulic drive systems with piston hydraulic machines. The method is based on generalized modeling (technical, physical, mathematical and computer), takes into account the peculiarities of mutual influence of electric and hydraulic machines during their joint work as part of the electrohydraulic drive, which raises the level and adequacy of actuators simulation, as well as the reliability of the assessment of their technical condition. The method extends the field of research, improves the accuracy of the calculation of the positioning of the executive elements, taking into account the different dynamic modes of the drives under study.

scholarly journals Application of physical theory of cavity in the construction of double skin facades

2021 ◽  
Vol 9 (1) ◽  
pp. 40-53
Author(s):  
Boris Bielek ◽  
Daniel Szabó ◽  
Josip Klem ◽  
Kristína Kaniková
Keyword(s):  
Flow Line ◽  
Aerodynamic Resistance ◽  
Climatic Conditions ◽  
Operating Modes ◽  
Outdoor Climate ◽  
Energy Needs ◽  
In Situ Experiments ◽  
Correct Function ◽  
Double Skin ◽  
Double Skin Facades

Abstract The article deals with the issue of double skin transparent facades as a new technological-operational system of transparent exterior walls. Especially of high-rise buildings, which with its operating modes ingeniously uses a renewable source of solar energy to reduce the energy needs of the building. The basic precondition for the correct function of the double skin facade is its functional aerodynamics in any climatic conditions of the outdoor climate. In the critical state of windlessness, the aerodynamic quantification of a double skin facade is the total aerodynamic resistance of the cavity, which consists of the aerodynamic frictional resistances along the length of the air flow line and local aerodynamic resistances of the cavity. The article analyses the functional aerodynamics on two frequented types of double skin facades with a narrow type and corridor type cavity. At the end it confronts functional aerodynamics with the results of their temperature, aerodynamic and energy regime obtained from in-situ experiments.

scholarly journals Mathematical model of multicomponent mixture flow of gases with regard to the possibility of the liquid phase

2018 ◽  
pp. 1-36
Author(s):  
Victor Timofeevich Zhukov ◽  
Yuri Germanovich Rykov ◽  
Olga Borisovna Feodoritova
Keyword(s):  
Mathematical Model ◽  
Liquid Phase ◽  
Multicomponent Mixture ◽  
Mixture Flow

scholarly journals Turbogenerator: Part 1: Simulation

2018 ◽  
Vol 7 (3.15) ◽  
pp. 277
Author(s):  
Lev Yu. Lezhnev ◽  
Alexey P. Tatarnikov ◽  
Arсady A. Skvortsov ◽  
Igor A. Papkin ◽  
Aleksandr S. Nekrasov
Keyword(s):  
Mathematical Model ◽  
Power Generation ◽  
Comparative Analysis ◽  
Power Plants ◽  
Computational Analysis ◽  
Exhaust System ◽  
Electric Machine ◽  
Distributed Power Generation ◽  
Technical Solutions ◽  
Work Done

The article describes the process of developing a turbogenerator for power plants of small and distributed power generation. The analysis of the component base for the turbogenerator was carried out, and thereof a comparative analysis of possible technical solutions was conducted. The work considered the installation variants of a turbogenerator in the exhaust system, an electric machine of a turbogenerator, types of turbines of a generator. A mathematical model for computation of the output effective and geometric parameters of a turbogenerator was described. The results of computational analysis were presented, and the parameters of the turbogenerator being developed were selected. Based on the results of the work done the conclusions were made  

scholarly journals Development of a mathematical model of diesel-generator units with a valve-inductor generator

2021 ◽  
Vol 2057 (1) ◽  
pp. 012076
Author(s):  
V A Zhigarev ◽  
A V Minakov ◽  
D V Guzei ◽  
M I Pryazhnikov ◽  
V I Panteleev
Keyword(s):  
Mathematical Model ◽  
Calculated Data ◽  
Power Losses ◽  
Diesel Generator ◽  
Fuel Injectors ◽  
Operating Modes ◽  
Effective Operation ◽  
Generator Unit ◽  
Operation Parameters

Abstract The paper presents a comprehensive mathematical model of a diesel-generator units with a valve-inductor generator. The calculated data obtained using this model allows optimizing the operation of fuel injectors and adjust the injection characteristics. The electromagnetic part of the model allows taking into account the power losses and efficiency of the generator, calculating the phase windings and their connection schemes, methods for setting the voltage or current of any shape that feeds the windings of the valve-inductor generator, as well as the characteristics of the rotor, stator, and winding materials to obtain the most effective operation parameters of the engine in various operating modes as part of the generator unit.

EXPERIMENTAL RESEARCH ON COMPRESSION FOAM COOLING DURING ITS DELIVERY AT DIFFERENT AMBIENT TEMPERATURE MODES

2021 ◽  
Vol 4 ◽  
pp. 40-44
Author(s):  
Gumirov A. ◽  
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Low Temperatures ◽  
Empirical Method ◽  
Research Application ◽  
Mass Consumption ◽  
Operating Modes ◽  
Research Findings ◽  
Conducting Research ◽  
The Impact

Purpose. The article describes methodology for conducting research on parameters of compression foam cooling during its delivery through hose-pump systems depending on the operating modes of the foam generating installation. The impact of mass consumption of compression foam on its cooling at low temperatures has been examined. The application of a mathematical model of air-foam mixture movement in hose-pump systems at different temperature modes has been substantiated. Methods. Empirical method-experiment has been used for research. Findings. A number of experiments have been carried out to confirm the developed model of compression foam moving in hose-pump systems at different temperature modes. A mobile installation for generating and delivering compression foam has been used as the object of the research. Inaccuracy in calculations obtained with the help of a mathematical model in comparison with the experimental data is 10% which makes a possible to claim that the model of compression foam moving in hose-pump systems at different temperature modes has been chosen properly. Research application field. According to the obtained data, it is possible to plan means and forces of fire units for extinguishing fires using compression foam at low temperatures. Conclusions. The developed mathematical model of compression foam movement during its delivery through hose-pump systems is confirmed by experimental data. The dependence of mass consumption impact on compression foam cooling when it is delivered through fire hoses at low temperatures has been obtained experimentally.

THE USE OF CASE TECHNOLOGY IN THE PROCESS OF STUDYING THE DISCIPLINE "MILITARY PSYCHOLOGY AND PEDAGOGY" AMONG CADETS IN THE SPECIALTY OF MILITARY MEDICAL SUPPORT

Vestnik ◽  
2021 ◽  
pp. 274-276
Author(s):  
Д.Т. Адырбеков ◽  
А.Т. Акчин ◽  
А.Ж. Мустафаева ◽  
Ж.Н. Бисенбаева ◽  
Л.Б. Абдулина
Keyword(s):  
Subject Area ◽  
Medical Support ◽  
Joint Work ◽  
Military Psychology ◽  
Ability To Work ◽  
Technical Literature ◽  
Research Activities ◽  
Research Ability ◽  
Pedagogical Knowledge And Skills ◽  
Independent Work

В данной статье рассматриваются вопросы использования кейс-технологии в процессе изучения дисциплины «Военная психология и педагогика» у курсантов. В статье указаны следующие условия повышения мотивации курсантов к изучению «Военной педагогики и психологии» а также указаны методы самостоятельных работ над ситуацией, где курсанты выполняют разновидности аналитической деятельности. Также указан анализ, что в ходе научно-исследовательской деятельности приобретаются и развиваются следующие качества у курсантов такие как: умение самостоятельно проводить исследование; умение работать с научно-технической литературой; инициатива и творчество; использование, расширение и углубление психолого-педагогических знаний и умений; опыт совместной работы с преподавателями специальных дисциплин; самоутверждение учащихся в данной предметной области и т.д. Кроме этого предлагается активная работа учащихся на основе использовании кейса, которая рассчитана на индивидуальное и групповое выполнение данных ситуаций. This article discusses the use of case technology in the process of studying the discipline "Military psychology and pedagogy" among cadets. The article specifies the following conditions for increasing the motivation of cadets to study "Military pedagogy and Psychology" and also specifies methods of independent work on the situation where cadets perform types of analytical activities. The analysis also indicates that in the course of research activities, the following qualities are acquired and developed in cadets, such as: the ability to independently conduct research; ability to work with scientific and technical literature; initiative and creativity; use, expansion and deepening of psychological and pedagogical knowledge and skills; experience of joint work with teachers of special disciplines; self-affirmation of students in this subject area, etc. In addition, it offers active work of students based on the use of the case, which is designed for individual and group implementation of these situations.

scholarly journals Creation of a mathematical model to identify short circuits in power lines

2019 ◽  
Vol 124 ◽  
pp. 02019
Author(s):  
A.N. Alyunov ◽  
O.S. Vyatkina ◽  
I.G. Akhmetova ◽  
B.E. Umirzakov ◽  
D.A. Tashmukhamedova
Keyword(s):  
Mathematical Model ◽  
High Speed ◽  
Power Lines ◽  
Small Length ◽  
Operating Modes ◽  
Modeling Power ◽  
Instantaneous Values ◽  
Short Circuits

We consider the issues of modeling power lines using a self-adjusting mathematical model which allows analyzing the lines operating modes while tracking instantaneous values of parameters. The obtained model can be used to build high-speed protection against phase-to-phase faults in power lines with a voltage of 10–35 kV, which have a small length.

scholarly journals Development of a mathematical model of vibratory non-lift movement of light seeds taking into account the aerodynamic forces and moments

2021 ◽  
Vol 3 (1 (111)) ◽  
pp. 70-78
Author(s):  
Аnton Nikiforov ◽  
Аlina Nykyforova ◽  
Roman Antoshchenkov ◽  
Vitalina Antoshchenkova ◽  
Sergey Diundik ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Aerodynamic Resistance ◽  
Euler Method ◽  
Dynamic Resistance ◽  
Algebraic Equations ◽  
Aerodynamic Forces ◽  
Tobacco Seeds ◽  
Fine Size ◽  
Lift Movement ◽  
The Impact

The modern practice of using vibratory machines when working with fine-size light-weight seeds is faced with such an undesirable phenomenon as the impact of aerodynamic forces and moments on the kinematics of vibrational movement of particles of the seed mixture fractions. According to the results of scientific studies devoted to the solution of this problem, only mathematical models of vibrational movement are used, where the aerodynamic factor is taken into account as taking the seeds by airflow. This is typical only for cleaning modes with the rebound of seeds from the vibrating surface. Aerodynamic forces and moments are present in them only as a force of aerodynamic resistance. The action of lateral aerodynamic forces and their moments are not taken into account. Their consideration allows to extend the range of action of the aerodynamic factor on the modes of vibration cleaning (vibroseparation) without rebound (but with sliding and rolling) which are of greater interest in terms of improving the efficiency of processing fine-size seeds. A mathematical model of seed vibration movement taking into account the action of a complete set of aerodynamic forces (dynamic resistance forces and lateral aerodynamic forces) and moments was proposed. This makes it possible to simulate non-lifting modes of vibrational movement of seeds. A system of algebraic equations that are linear with respect to the kinematic parameters of seed movement which was obtained by translating differential equations of movement into a finite-difference form was presented. The possibility of numerical solution of equations of movement by the Euler method was shown. The results of the evaluation of the model adequacy for the processes of vibration separation of tobacco seeds and false flax were presented. As shown by the results of calculations and experiments, the developed model provides an increase in the adequacy of the simulation results by 30 % in comparison with the model where the aerodynamic factor is not taken into account

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