scholarly journals Mathematical models of magnetic circuits of a magnetomodulation DC converter

2021 ◽  
Vol 2094 (5) ◽  
pp. 052039
Author(s):  
N O Ataullayev ◽  
D F Nizomova ◽  
B Q Muxammadov
Keyword(s):  
Mathematical Models ◽  
Line Graph ◽  
Operation Mode ◽  
Power Supplies ◽  
Differential Sensitivity ◽  
System Control ◽  
Static Characteristics ◽  
Magnetic Circuits ◽  
Improve Accuracy

Abstract Monitoring of the operation mode of autonomous power supplies with magnetically modulating DC converters and system control, differential sensitivity, improve accuracy and reliability and monitor its static characteristics in the form of a line graph.

scholarly journals RESULTS OF EXPERIMENTAL STUDIES OF ACCELERATIONS OF THE DM-617 VIBRATORY ROLLER USING DIGITAL SIGNAL PROCESSING TECHNOLOGY

2020 ◽  
Vol 17 (2) ◽  
pp. 182-195
Author(s):  
I. S. Tiuremnov ◽  
S. N. Ivanov ◽  
A. S. Kraiushkin
Keyword(s):  
Mathematical Models ◽  
Dynamic Modulus ◽  
Vibration Mode ◽  
Operation Mode ◽  
Experimental Studies ◽  
Vertical Vibration ◽  
Vertical Acceleration ◽  
Soil Deformation ◽  
Compacted Soil ◽  
Vertical Accelerations

Introduction. To improve the vibrating rollers in order to increase sealing capacity, reliability and vibration safety, the interaction of vibrating roller parts between each other and with compacted soil is simulated mathematically. The developed models are validated, i.e. compared with the results of experimental studies. However, the known results of experimental studies were obtained based on a relatively small list of vibrating roller models and soil types, as well as in a steady vibration mode. The paper presents the results of experimental studies, which used a vibratory drum of a roller to study its vertical vibration accelerations both in the steady vibration, as well as transient mode at turning the vibration generator on (speedup) and off (halt). This expands the range of opportunities to validate the existing and newly developed mathematical models.Materials and methods. Experimental studies of vertical vibration accelerations of a drum were conducted using the DM-617 vibrating roller when compacting natural sand-gravel aggregate. The accelerometer readings show high-frequency harmonics, which makes it significantly more difficult to determine amplitude values of vibration accelerations, therefore a low-frequency filter with a boundary frequency of 200 Hz was used for digital processing.Results. It was determined that when the DM-617 vibrating roller is compacting soil with maximum driving force within the range of variation of dynamic modulus of soil deformation Evd=14…25 MPа, amplitude values of vertical vibration accelerations of the vibratory drum are from 65... 77 to -61... -69 m/s2 . At the start-up (speedup) of vibration generator, acceleration amplitudes are 1.1 times higher than vertical accelerations of steady operation mode of the vibrating drum and practically do not depend on the dynamic modulus of soil deformation Evd. At turning off (stop) of the vibration generator, amplitude of vertical accelerations do not exceed the vertical accelerations of the steady operation mode of the vibratory drum.Discussion and conclusion. The vertical acceleration amplitudes of vibratory drums of DM-617 do not depend on the dynamic soil deformation modulus Evd, and this is consistent with the results of experimental studies of the vibratory drum mounted on DM-614. The obtained vertical vibration accelerations of the drum mounted on DM-617 in the steady vibration mode, as well as at switching the vibration generator on (speedup) and off (halt) make it possible to verify the existing and developed mathematical models of interaction of vibrating rollers with compacted soil.Financial transparency: the authors have no financial interest in the presented materials or methods. There is no conflict of interest.

scholarly journals Analysis of magnetic fields of electrical devices based on their circuit models

2021 ◽  
Vol 11 (1) ◽  
pp. 7-11
Author(s):  
Vsevolod Horyachko ◽  
◽  
Orest Hamola ◽  
Taras Ryzhyi ◽  
◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Mathematical Models ◽  
Electric Machines ◽  
Physical Parameters ◽  
Design Features ◽  
Magnetic Systems ◽  
Magnetic Circuits ◽  
Electromagnetic Devices ◽  
Electrical Devices ◽  
Lumped Elements

he article deals with an analysis of magnetic fields of electric machines and electromagnetic devices on the basis of their circuit mathematical models. The magnetic systems of electrical devices in these models are presented in the form of planar nonlinear magnetic circuits with lumped elements. The parameters of these elements are determined on the basis of geometric dimensions taking into account the design features of the devices and the physical parameters of the environment.

Basic Software for NSLS-II Booster Synchrotron Magnetic System Control

2014 ◽  
Vol 9 (3) ◽  
pp. 88-98
Author(s):  
Anton Derbenev ◽  
Sergey Karnaev ◽  
Aleksandr Makeev ◽  
Pavel Cheblakov
Keyword(s):  
Control System ◽  
Power Supply ◽  
Digital Control ◽  
Magnetic System ◽  
Power Supplies ◽  
System Control ◽  
Basic Software ◽  
Booster Synchrotron ◽  
Specific Control

NSLS-II booster synchrotron magnetic system requires a specific control hardware and software. This article describes the control system as a whole and its concepts of operation. Principles of control were proposed and EPICS-based software was developed, permitting individual independent digital control of each power supply. This design provides precise alteration of power supplies operation in each synchrotron cycle with frequency of 1 or 2 Hz

Physical and mathematical models of ballast bed tamping via rotary device

2016 ◽  
pp. 5-16
Author(s):  
Nikita Polyanichko
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Operation Mode ◽  
Practical Importance ◽  
Theoretical Research ◽  
Technological Parameters ◽  
Physical Experiments ◽  
Physical And Mathematical Models ◽  
The Mathematical Model ◽  
Rotary Device

Objective: To develop a mathematical model and program for defining rational technological parameters and operation mode of a rotary device for tamping the ballast bed in the tie space area. Establish the veracity of calculations performed using the mathematical model and program developed via mathematical and physical experiments. Methods: Experimental and theoretical research conducted. Results: Established veracity of the mathematical model and program for calculating the technological parameters and operation mode of the device for tamping the ballastbed in the tie space area. Practical importance: The program developed provides the ability to select rational technological parameters and operation mode for the device. It is recommended that it be used when creating tools for ballast bed solidification in the ballast box area.

scholarly journals Analysis of Various Approaches to Modeling of Dynamics of Lifting-Transport Vehicles

2018 ◽  
Vol 7 (4.3) ◽  
pp. 64 ◽  
Author(s):  
Otto Grigorov ◽  
Evgenij Druzhynin ◽  
Galina Anishchenko ◽  
Marjana Strizhak ◽  
Vsevolod Strizhak
Keyword(s):  
Numerical Modeling ◽  
Mathematical Models ◽  
Dynamic Characteristics ◽  
Equations Of Motion ◽  
Operation Mode ◽  
Design Models ◽  
Software Complex ◽  
Container Cranes ◽  
Container Crane ◽  
Modeling Of Dynamics

The results of analytical and numerical modeling of dynamic characteristics of linear and non-linear mathematical models of the “trolley-load” system of bridge and container cranes are presented. KiDyM software complex is used for numerical modeling, which, based on the use of the apparatus of structural matrices and the built-in computer algebra system, allows the construction of ordinary differential equations of motion of the class of systems under consideration at the analytical level. Recommendations on the possible use of the considered mathematical models of the “trolley-load” system in various regular and forced operation modes of bridge and container cranes are given on the basis of the analysis. The ratio of the results of calculations for various design models of regular and forced operation of the bridge crane has been established. The magnitude of the distribution of the maximum values of the dynamic characteristics of motion of the container crane has been designed by calculating the forced operation mode using various mathematical models.  

scholarly journals Multi-Objective Optimization Dispatch Based Energy Management of A Microgrid Running Under Grid Connected and Standalone Operation Mode

2021 ◽  
Vol 10 (2) ◽  
pp. 333-343
Author(s):  
Marouane Lagouir ◽  
Abdelmajid Badri ◽  
Yassine Sayouti
Keyword(s):  
Optimization Problem ◽  
Operation Mode ◽  
Operating Cost ◽  
Optimization Techniques ◽  
Pollutant Emission ◽  
System Control ◽  
Optimization Approach ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Weighted Sum Method

This paper presents a novel optimization approach for a day-ahead power management and control of a DC microgrid (MG). The multi-objective optimization dispatch (MOOD) problem involves minimizing the overall operating cost, pollutant emission levels of (NOx, SO2 and CO2) and the power loss cost of the conversion devices. The weighted sum method is selected to convert the multi-objective optimization problem into a single optimization problem. Then, analytic hierarchy process (AHP) method is applied to determine the weight coefficients, according to the preference of each objective function. The system’s performance is evaluated under both grid connected and standalone operation mode, considering power balancing, high level penetration of renewable energy, optimal scheduling of charging/discharging of battery storage system, control of load curtailment and the system technical constraints. Ant lion optimizer (ALO) method is considered for handling MOOD, and the performance of the proposed algorithm is compared with other known heuristic optimization techniques.  The simulation results prove the effectiveness and the capability of the developed approach to deal better with the coordinated control and optimization dispatch problem.They also revealed that economically running the MG system under grid connected mode can reduce the overall cost by around 4.70% compared to when it is in standalone operation mode.

scholarly journals Electronic devices for studying mechanical properties of biological tissues

2020 ◽  
pp. 40-47
Author(s):  
A. G. Dubko ◽  
R. S. Osipov ◽  
Yu. V. Bondarenko ◽  
O. F. Bondarenko
Keyword(s):  
Mechanical Properties ◽  
Mathematical Models ◽  
Biological Tissue ◽  
Low Cost ◽  
Operation Mode ◽  
Experimental System ◽  
Biological Tissues ◽  
Optimal Operation ◽  
Biocompatible Materials ◽  
Tissue Samples

The paper shows the relevance of studying the mechanical properties of biological tissues and biocompatible materials for solving the problems of general and reconstructive surgery, transplantology, manual therapy, virtual simulation of surgical operations, robotic surgery, etc. The authors present basic information about biological tissue as an object of research and give a brief overview of the devices used for studying the mechanical characteristics of biological tissues. An experimental system for testing deformations of biological tissues and biocompatible materials during compression is described. The system is developed using modern hardware and software, as well as effective technical solutions. The results of the practical use of the developed device are presented and the obtained dependences of the mechanical stress of biological tissue samples on their deformation under pressure are analyzed. The system has high metrological characteristics and low cost, and allows performing all the necessary functions for measuring, processing and visualizing the data. The measurements obtained with this system can help form the recommendations for doctors on choosing the optimal operation mode of medical devices and instruments in each specific case. In addition, the measured data can be used to create mathematical models of biological tissues and biocompatible materials in order to further carry out virtual experiments. In further studies, the authors plan to create the mathematical models of biological tissues based on the finite element method and using the actual values characterizing the tissue, obtained with the developed system.

scholarly journals Development of Refined Electromagnetic Models of Reciprocating Electric Generators with Permanent Magnets

2021 ◽  
Vol 64 (4) ◽  
pp. 291-302
Author(s):  
A. B. Menzhinski ◽  
A. N. Malashin ◽  
P. B. Menzhinski
Keyword(s):  
Magnetic Flux ◽  
Mathematical Models ◽  
Permanent Magnets ◽  
Magnetic System ◽  
Optimization Problems ◽  
Reciprocating Motion ◽  
Magnetic Circuits ◽  
Electromagnetic Calculation ◽  
Electric Generators ◽  
Electromagnetic Models

The analysis of scientific papers devoted to the mathematical description of electric generators of reciprocating motion with permanent magnets demonstrated that the proposed mathematical models of this type of generators are based on the theory of magnetic circuits. Such mathematical models are based on a simplified representation of the magnetic system and the magnetic field in the form of a magnetic circuit with corresponding magnetic conductivities. However, unlike traditional rotary type electric machines, electric generators of reciprocating motion have a number of features, the omission of which in mathematical modeling causes the increase of  the cost of their creation (due to the duration of the design and experimental refinement of the generators). Therefore, at the initial stages of electromagnetic calculation and solving optimization problems, it is necessary to use adequate mathematical models to improve the accuracy of calculations of the parameters of these generators. For this purpose, a mathematical model based on field theory can be used; however, its main drawback is the complexity of its application for solving optimization problems. In this regard, to improve the accuracy of calculations of the parameters of electric generators of reciprocating motion with permanent magnets, it is proposed to use refining coefficients (coefficients of scattering and buckling of the magnetic flux) in mathematical models based on the theory of magnetic circuits. The authors have developed refined electromagnetic models of electric generators of reciprocating motion with permanent magnets, which make it possible to obtain the main parameters of generators at the initial stages of electromagnetic calculation and when solving optimization problems with acceptable accuracy. A distinctive feature of the refined electromagnetic models of generators is the consideration of the scattering and buckling coefficients of the magnetic flux in the magnetic system that change during the simulation.  

scholarly journals High-frequency periodic processes in two-winding power transformers

2021 ◽  
pp. 96-100
Author(s):  
M.S Seheda ◽  
P.F Gogolyuk ◽  
Y.V Blyznak
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Mathematical Models ◽  
High Frequency ◽  
Structural Parameters ◽  
Power Transformers ◽  
Voltage Distribution ◽  
Magnetic Circuits ◽  
Periodic Processes ◽  
The Mathematical Model

Purpose. Mathematical modeling of high-frequency periodic processes in winding power transformers to improve the technology of their design and operation. Methodology. The methods of the formation of mathematical models for the research of high-frequency periodic processes in transformers and methods of solving systems of partial differential equations are applied. Findings. The mathematical model for the research of high-frequency periodic processes in two-winding transformers, with adequate considering of electromagnetic connections of windings and structural parameters of transformers, is created. Originality. To form a mathematical model for the research of high-frequency periodic processes, a substitute scheme of a two-windings transformer, taking into account the parameters of the electric and magnetic circuits of windings and electromagnetic connections between them, is proposed. Practical value. The mathematical model, which allows analyzing the voltage distribution in the transformer windings for high-frequency periodic processes in windings, and adjusting their insulating abilities, is created.

Sign in / Sign up

Export Citation Format

Share Document