Comparison of energy efficiency of a synchronous electric generator with a spark ignition engine using gasoline and gasoline blended with ethanol

ABSTRACT. The article presents new data on energy indicators, such as specific fuel consumption and power plant energy efficiency. The use of the obtained data makes it possible to establish the dependence of specific energy indicators on the levels of loading of the power unit. The established distribution makes it possible to determine the optimal parameters of the experimental setup and flow rate at different load levels. The highest specific fuel consumption is observed (1189-1297 g/(kWh) and 962-1147 g/kWh)) at the lowest and highest load for different types of fuel. Experimental data show that ethanol-free fuels can generate more electricity to be used when demand is higher.

Experimental Studies of Systems of Active Shielding of the Magnetic Field with an Orthogonal System of Compensation Windings

ABSTRACT. A physical model of single-circuit three-phase power line with a horizontal arrangement of wires and systems of active shielding of magnetic field with a system of six orthogonally arranged square Helmholtz shielding windings have been developed and manufactured. Experimental studies of open, closed and feed forward systems of active screening of the magnetic field with a system of six orthogonally arranged square Helmholtz windings were carried out. The possibility of reducing the level of magnetic field induction in a given zone by a factor of 5–10 for a system of active shielding of a magnetic field with a system of six orthogonally arranged square Helmholtz shielding windings of a magnetic actuator has been experimentally confirmed. The possibility of reducing the level of magnetic field induction in a limited area of the considered space by 15–50 times is shown.

The Electricity Distribution of Alternating Current and Voltage Higher Harmonics Research in Network with Electrical Complex of Direct Current Drive

ABSTRACT. Study of electricity consumption in the workshop of an industrial enterprise with a furnace drive electrical complex, the power part of which is made by a semiconductors rectifier - DC motor system. The study was conducted on a model compiled in a visual programming environment. Guided by the calculation formulas recommended by the IEEE 1459-2010 standard for determining of active and reactive power components, the corresponding measuring subsystem was introduced into the model. A number of experiments were carried out under the condition of control angle changing a semiconductors converter. The values of the fundamental and higher harmonics in active and reactive power are determined. It has been established that the reactive power of higher harmonics generated by a controlled semiconductors converter is transmitted through a step-down transformer without changes. The proposed procedure of separating the higher harmonics active and reactive power is rational to apply in the electric energy technical accounting systems an industrial enterprises.

Mobile Power Measuring Complex a Three-Phase Motor with Separation Low-Frequency Vibration Components

ABSTRACT. Electric drive elements are a common network
load in power supply systems. Inaccuracies in the electric
machine installation and changes in the load, lead to constant
changes in power consumption, including in the vibration event.
Vibration forces have a negative effect on the machine
mechanical fastenings and the mechanism. Vibration control is
usually provided by specialized portable equipment. As a result
vibrations there are deviations in electric power which occupy
one of key places. Therefore, to monitor the processes in the
induction motor, it is necessary to monitor the electric machine
power.
To obtain the necessary information on changes in power,
developed a device for collecting electrical signals of the power
circuit and a program for data processing. The device is
designed for data collection both in places with access to power
from the network, and in places with the appropriate voltage,
for direct connection to the network. The program is based on
wavelet conversion of instantaneous three phases power, which
allows you to convert a signal from the time domain to the
frequency time. From the total power observation in the
frequency-time domain, two frequency bands with constant
expressed signals were obtained. In addition, due to a
experiments series, a constant decrease in the amplitude power
fluctuations with a frequen

Aeroelastic flutter oscilations of distributed systems

ABSTRACT. The reasons and the set of parameters leading to aeroelastic flutter oscillations in distributed systems (DS) are investigated. The instability is caused by the combined influence of three factors: the disturbances drift along the DS in the flow, the bending stiffness, and the influence of an inertial force, which is a distributed load moving along the DS. This vertical bladeless wind turbine looks like a huge baseball bat fixed on a handle and swaying in the wind. The swaying concept is based on a flow oscillating when a fluid such as air or water flows past a cylindrical body. The vortices are created in this flow at the back of the body and periodically are separated from either side of the body. This effect is called Von Kármán vortex street. It is destructive for civil structures, and that is why the civil engineers prevent the possibility for the structures to enter into resonance. The Vortex Bladeless engineers decided to make use of this destructive effect. This innovative structure has other advantages. It starts to oscillate at the lower speeds of the wind. It is possible to locate stations much closer to each other. The turbines of the classical design with a dense arrangement do not receive enough wind flow, but this bladeless generator only benefits from a dense placement as its oscillatory effect is amplified by the vortices from the generators ahead. Also, it produces almost no harmful noise, it is safe for birds and doesn’t close the horizon. The described mathematical concept and numerical algorithm, as well as the achieved results can be used to design and optimize the bladeless wind turbines operation modes. The described mathematical concept and numerical algorithm, as well as the results obtained can be used to design and optimize the operating modes for the bladeless wind turbine.

Prediction of the final discharge of the UAV battery based on fuzzy logic estimation of information and influencing parameters

ABSTRACT. The article, based on the analysis of existing battery management systems, developed a method for determining the critical battery discharge time based on fuzzy logic apparatus that uses data on informative and influential parameters, comparing the defined critical time with the planned and, if necessary, maintaining the required level of flight safety.

Increasing the accuracy of determining the resistance of three-phase busbar’s trolleys

ABSTRACT. Shop floor power supply systems must meet stringent requirements for high reliability and efficiency. Trolley´s busbars are an important element of the power supply system. Currently, engineering methods are known that allow to determine the resistance of trolleys. But they have a high error, since they do not take into account the surface effect, skin effect, proximity effects, edge effects, as well as the higher harmonics of the current in the network. In this paper, an approach is proposed that allows to determine the resistance in the trolley´s busbars with high accuracy. This method is based on the application of the decomposition of electromagnetic processes in a trolley´s busbars. The method implements the inclusion of one of the phases of the busbar to determine the resistance without the influence of an external magnetic field. As well as two phases of the busbar to determine the active resistance in the presence of an external magnetic field caused by the action of a third-party current of the neighboring trolley´s busbars. The paper presents dependences for determining the values of resistance for the corresponding phases and harmonics of the current without spending time on field modeling. And also, regardless of the location of the trolleys, their number, shape, as well as the non-symmetry of the phase currents.

Improving the efficiency of an overhead crane feeding from a trolley’s line under conditions of higher current harmonics

ABSTRACT. A simulation model of interconnected electromagnetic processes between electric drives of an overhead crane moving mechanism (with relay-contactor system and frequency converter) and current-conducting elements of the power supply system of an overhead crane has been developed. The interconnected electromagnetic processes between electric drives of overhead crane moving mechanism and busbar's trolleys have been researched. The voltage loss relationships in the trolleys at the moment of the asynchronous electric drive have been established. Determined the maximum allowable distance of the overhead crane to the feeding point of the trolley section of the busbar, which provides trouble-free operation of the overhead crane electric drive, as well as the number of feeding points of the busbar trolley sections and the distance between them, which will ensure the same level of losses at the fundamental harmonic current. Recommendations to reduce voltage losses and active losses in the busbar's trolley from the action of higher current harmonics were developed.

An accuracy improving of determining a inductances of three-phase busbar’s trolleys, taking into account higher current harmonics

ABSTRACT. The paper presents a method, that allows to determine with high accuracy the reactance of trolleys for each k-th frequency of the harmonics of the current. It allows to take into account the presence of the effect of intimacy, surface effects, skin effect. Also the asymmetry between the phases and the distance between a trolleys. On the basis of research, dependences are obtained, that allow to determine the values of inductance, leakage inductance and mutual inductance. And also take into account the distance between the trolleys, the form of the trolleys, their number, as well as the asymmetry of phase currents, without spending time on modeling the field. According to the results of the study it was found that the inductance of the phase busbar’s trolley, when changing the angle of the current vector for its full period in the neighboring trolley, changes with the same initial phase for all k-th harmonics of the cosine law, a constant component the leakage inductance of the trolley of the corresponding frequency k-th harmonic current.

Determination of the Soil Parameters of the Outdoor Switchgear in the Dense Urban Development

ABSTRACT. The grounding system provides electrical safety for staff and the reliability of expensive equipment of outdoor switchgear. Testing the grounding system in accordance with modern standards requires the determination of soil parameters as a dependence of apparent resistivity on the sounding depth. The impact multivariate interpretation of the results of sounding on the calculation of touch voltage is presented. In this work, combined technique of soil sounding has been developed, which allow complex testing of the grounding system in accordance with the IEEE and IEC standards. Comparison of the interpretation of sounding results by the traditional Wenner configuration and the combined technique is given.

Improving the Performance of Distance Relay-Based Artificial Neural Network

ABSTRACT. Distance relays for protection of power transmission lines used, which can be based on fixed stings Adjusted. But usually, the amplitude of operation of these relays changes with changing network conditions (network topology, load value, output value, etc.) and causes the relay to malfunction, using methods that can process information and pattern recognition, such as the use of fine processors and intelligent algorithms can use new relays that have high accuracy and thus achieve proper protection. In this paper, a distance relay is simulated by a neural network and it is observed that the neural relay has higher accuracy than a normal relay. In addition to fault detection and location, the type and phase of the fault can perform simultaneous protection of three phases. As a result, the number of line relays can be reduced by using neural relays. The MLP neural network is used to simulate the distance relay

Protection of DC Microgrids Based on Frequency Domain Analysis using Fourier Transform

ABSTRACT. Due to the expansion of the use of distributed generation sources and especially renewable energy resources, the use of microgrids is increasing rapidly. The protection of DC microgrids is one of the most important challenges in the design and operation of this type of electrical network. In this paper, a new protection method based on Fourier transform with fault detection capability in different operating conditions is presented. The advantages of the proposed method in comparison with the methods of current change rate, etc., are the speed of its protective operation and the ability to detect faults with high impedance and resistance. The directional protection capability of the proposed method and the coordination of protection equipment are other advantages of the proposed method. The results of the implementation of the proposed method on a sample DC microgrid indicate the efficiency of the proposed method in different operating conditions, fault resistance, etc.

Investigation of Reliability of Emergency Shutdown of Consumers in Electric Power Systems of Explosive Hazadous Zones

ABSTRACT. The dependence of reliability of emergency shutdown of consumers in electric power systems of explosive hazardous zones on such parameters of electric network as nominal currents of electromagnetic declutch of circuit breaker and fusible fuse insert, approximate calculated impedance of transformer, material, cross - section and length of cable. The obtained results will prevent the appearance of ignition sources of electrical origin during the operation of consumers in electric power systems of explosive hazardous zones

The Microcontroller Stand for Investigation of Tripping Thresholds of Voltage Control Relays for Household Consumers

ABSTRACT. In the study of voltage control relays the problem
of voltage adjustment accuracy is occurred. During execution
of experiments with voltage control relays the preset increasing
or decreasing voltage velocity is mandatory. This paper
examines the design features of the laboratory stand for
investigation of tripping thresholds of voltage control relays for
household consumers. The main focus is applied to the
possibility of increasing or decreasing the voltage value with
the preset constant velocity precisiously and automatically.
Furthermore the servo drive based on stepping motor under
control of microcontroller is described in detail which is
needed for satisfying all of mentioned requirements. Much
attention is payed not only to solutions implemented in
electrical circuit of laboratory stand but also to
microcontroller programming solutions. The figures with
appearance of laboratory stand and electrical circuit diagrams
are presented.
In conclusion authors show that laboratory stand allows to
withdraw the protective tripping characteristic of the voltage
control relay at unacceptable voltage deviations with a small
error and in lesser time because the influence of human factor
during increase or decrease of voltage at required velocity is
excluded.
This paper might be useful for the specialists in this or
similar subject area, for instance investigations of protective
voltage relays for industrial applications.

Dynamics and energy efficiency of the process of energy storage from wind turbine installation at the pumped hydro storage station

ABSTRACT. Mathematical modeling and assessment of the energy efficiency of the energy storage process of the wind power plant at the pumped hydro storage station with different numbers of hydraulic pumping units taking into account the stochastic change in wind speed were performed. The probability distribution of the differential density of wind speeds during the year was corresponded to the two-parameter Weibull distribution. The change in water flow rate due to the presence of wind speed pulsations was determined based on the solution of a system of nonlinear differential equations that describes the dynamics of the interaction of two inertial components: a wind turbine - generator and an electric motor-hydro pump. Modeling of non-stationary electro-hydro-mechanical processes was performed using a system of the per-unit system which made it possible to apply the results of research for a wide range of changes in the power of wind turbines. The rational number of hydraulic pumping units in the pumped hydro storage station was determined to achieve the maximum values of the coefficient of utilization of the installed capacity of the wind turbine installation.

Decreasing of Bias of Modified Cross-Correlation Method for Phase Shift Measurement

ABSTRACT. This paper discusses an approach for the removal of bias of the modified cross-correlation method for phase shift measurement. Unlike the traditional cross-correlation method, which implies the calculation of the cross-correlation function between the signals with the same frequencies, the modified method is based on a preliminary calculation of several inner products of the analyzed signals with the auxiliary sine functions with different frequencies. The removal of bias is attained by the specific selection of frequencies of the auxiliary sine functions. Paper also presents the results of the comparative analysis of noise stability of the conventional and the modified cross-correlation methods under the affect of the additive and normally distributed noise contamination. The results of simulations have shown a higher level of noise stability of the modified method for the case of low values of phase shift between the analyzed signals. For the case of values of phase shift close to 90º the conventional cross-correlation method has shown a higher level of noise stability and its applying still remains preferable.

Methodology for Algorithmic Correction of Dynamic Properties of the Electric Drive of the Orientation and Stabilization System of the Sensitivity Axis of the Mobile Directional Sensor

ABSTRACT. The technique of digital algorithmic correction of dynamic properties of the electric drive is offered. The application of the technique allowed to achieve quasi-invariant properties of the electric drive in relation to the angular velocity of its rotor.

The Air Barriers Optimal Geometry Determination for a Synchronous Reluctance Motor Outer Rotor

ABSTRACT. The article is devoted to research on the design of an external synchronous reluctance motor without a magnetic rotor with a three-phase stator winding. Today, such motors are widely used in the creation of low-power vehicles with autonomous electrical power. In the design of the outer rotor, there are no expensive permanent magnets and a short-circuited winding, which leads to a decrease in its mass, moment of inertia and to the absence of electrical losses in the rotor winding. Since the source of electrical energy of such vehicles is a battery, the characteristics of traction motors are subject to increased requirements for their efficiency: high efficiency, high torque. Therefore, the issues of creating motors with the highest possible technical characteristics are very relevant. Variants of configurations of air barriers of the outer rotor are analyzed. The task was set to carry out computational modeling of various variants of shapes and sizes of air barriers of the rotor. The optimization criterion for solving this problem was to obtain the required torque on the rotor, the maximum efficiency, and the smallest value of the rotor vibrations, which are caused by magnetic interactions. Calculations by the finite element method were carried out, energy characteristics, efficiency, rotor vibrations were determined for three configurations of air barriers. The proposed algorithm for designing such motors makes it possible to determine the optimal design of the outer rotor of a synchronous reluctance motor and obtain high performance.

Simulink Study of the Dynamics of Electrical Mode Coordinates Combined Regulation of an Arc Furnace

ABSTRACT. A two-loop high-speed structure is proposed to regulate the electric mode (EM) of an arc steel melting furnace (AF) is proposed. A solution to improving the indices of the dynamics of EM coordinate regulation indices has been developed and studied. A comparative analysis of the dynamic indices of the proposed two-loop structure of fuzzy regulation of the coordinates of the EM arc furnace DSP-200 and the ARDM-T-12 serial arc power controller was performed. The time dependences of the main EM coordinates and the integral values of the quality indices of dynamics and energy efficiency during the regulation of random EM disturbances have been obtained on the computer model. The comparative analysis of the obtained dynamic indices has confirmed the effectiveness of the proposed high-speed two-circuit structure of the EM coordinate control system compared to the ARDM-T-12 controller.

Research of Electric Drive of Drawing Mill with Implementation of Electroplastic Effect

ABSTRACT. Analyzed various tests to check the wire that moves through the die to increase its plasticity and improve the quality of the hairs. Based on the calculated and experimental data, a comparison was made of energy consumption when creating a given temperature distribution by direct transmission of electric current through a moving wire and its heating in a continuous muffle furnace. Mathematical modeling of the heating parameters of each method is performed on the corresponding mathematical model. The applied mathematical model is based on the boundary value problem for the heat equation. To confirm the adequacy of the mathematical model, experimental studies were carried out with temperature measurements at the control points of the heating zone. Calculations were made of the parameters of wire heating by pulsed current, which forms the electroplastic effect during drawing. According to the results of the study, it was found that in order to increase the plasticity of the wire during the drawing operation, it is advisable to use a pulsed current.

Analysis of Operational Characteristics of SRM in Emergency Modes of the Converter Unit

ABSTRACT. The paper analyzes the issues of maintaining the operability of a switched reluctance motor (SRM) in various emergency situations. The researches were carried out using simulation modeling in the Matlab environment, the developed model was used for both normal and emergency operation modes. A series of dynamic tests of the motor torque has been carried out, and the values of the electromagnetic torque pulsation coefficient have been calculated. The possibility of maintaining the operability of a SRM in the event of various emergency situations in the phases of the motor has been proved. The static mechanical characteristics of the motor are built and the calculation of the droop of the mechanical characteristics for possible emergency modes is performed.

NEUROREGULATOR WITH A SIMPLIFIED STRUCTURE FOR ELECTRIC DRIVE WITH FRICTIONAL LOAD

ABSTRACT. A controller for electromechanical drive systems according to the structure of an output neuron is proposed. Unlike the synthesis of a traditional neural network of a neurocontroller, when finding weight coefficients, that require multiple iterative computer calculations, for the proposed controller is excluded. It’s determined by the derived analytical relations. Compared to a modal controller, for which it is necessary to measure a number of the electric drive coordinates, including those that are difficult to measure, in the proposed one it is enough to measuring only one output coordinate. It was reached through the use of inverse finite difference method and clean physical concepts. For a linear system, one output neuron is enough, for a non-linear system, their number is equal to the number of sections linearizing the non-linearity. The method was illustrated on example of 2-mass electromechanical system with frictional load.

Improving the Energy Efficiency of a Mine Drainage Installation by Means of an Industrial Electric Drive

ABSTRACT. The publication is devoted to determining the possibilities of reducing the energy consumption of drainage systems of mines and determining the numerical indicators of energy saving using mathematical modeling. Novelty of paper. The minimum required structure of the mathematical model of the mine drainage horizon for the study of energy consumption is substantiated, the existence of the minimum energy consumption of the main drainage pump at speed control is proved, the appearance of regression dependences of energy consumption and pump operating time on speed and inflow. Research methods. General methods of physics, hydraulics, mathematical analysis and computational mathematics were used in solving the tasks. Numerical solution of mathematical model equations and visualization of the obtained results were performed in MATLAB® / Simulink environment, methods of experimental design theory for regression analysis. The results obtained. The conditions under which the potential for energy saving of the pumping equipment of the main drainage of mines when using an adjustable electric drive appears. The existence of the minimum energy consumption of the pumping unit of the main drainage of the mine has been proved. Based on the regression analysis of the results of mathematical modeling of the pumping station of the main drainage of the mine, it is established that the regression dependences of the pumping unit operation time and its energy consumption have a shape close to the hyperboloid section. Practical value. The use of the results of work makes it possible in different mines to determine the potential for energy savings when using an adjustable electric drive, to make an economically sound decision on the feasibility of using an adjustable electric drive in specific production conditions.

Influence of sharp load fluctuations on electromagnetic processes in electrical equipment

ABSTRACT. The Offered methods of the study and analysis to collections paraмеtres nonveriabl power hungry electrotechnological complex in coone hundred-ve arc steel-melting stoves and agitated by them electromagnetic processes in electroequipment.

Two-channel slipping detection of the mine electric locomotive wheels by the traction electric drive current spectrum

ABSTRACT. The article substantiates the principles for determining the fact of slipping and skidding of the mine electric locomotive wheels without measuring the wheel slip speed relative to the rails. To improve the reliability detecting of excessive slip (creep) it's proposed to measure electric motor current pulsations which contain the frequency from frictional self-oscillations (FSO) and frictional oscillations (FO) from a periodic change in the normal pressure force when the electric locomotive moves along the rails. The structure of the sensor has been developed, computer simulation was performed, and the possibility of the proposed principles were shown.

Electromechanical System Motion Control in Direct and Inverse Time

ABSTRACT. The paper deals with the development of mathematical backgrounds to transform dynamical system into the generalized time domain. This transformation allows to change the trajectory of the dynamical system's motion and gives to dynamical system new properties and features. One of such features is the possibility to form motion trajectories with identical anterior and posterior fronts. This feature gives us the possibility to improve system performance and accuracy and we consider system motion in direct and inverse time to ensure it. We study different time domains and define transformation functions to perform the transition from the one time domain into another one. As a result of our studies, we define generalized transformation factor and patterns in its determining, which usage makes it possible to rewrite the differential equation of the considered dynamical system into desired time domain without applying any transformation routines and defining any transformation functions. The implementation of our approach brings us to consider variable structure dynamical system which has an identical start and stop trajectories.

Adaptive to rotor resistance variations speed estimation algorithms for induction motors

ABSTRACT. Speed estimation algorithms adaptive to rotor resistance variations for speed sensorless field-oriented controlled induction drives are presented. The proposed solution exploits the concept of the full-order flux observer. The overestimation of motor fluxes is applied in order to separate processes of speed and rotor resistance estimation. The adaptive speed estimation algorithm guarantees local asymptotic estimation of stator currents, rotor speed and rotor resistance if conditions of persistency of excitation are met. The stability properties of the estimation algorithm are studied using Lyapunov’s second method. It is shown by simulation that the algorithm provides an acceptable dynamics of the speed and rotor resistance estimation. Comparison with the algorithm without flux overestimation, designed using similar approach is presented. If conditions of persistency of excitation are not fulfilled, the algorithm can be used to separately estimate rotor resistance and then use this information in speed estimation algorithm. The proposed observer is suitable for the applications with medium requirements for speed regulation performance.

Neural Network Controller Based Slippage Prevention System For Electric Vehicle

ABSTRACT. Mathematical model of an asynchronous electric drive of an electric vehicle was built. The mathematical model of the mechanical part was built taking into account the possibility of modeling the slipping of each of the driving wheels separately with different coefficients of adhesion. A simplified model (plant model) was built, neural network parameters were chosen, such as the number of hidden layers, discretization, the number of samples and the number of epochs for training the neural network. The neural network was trained taking into account the linearized plant model, which reflects the qualitative form of real processes in the system. The analysis of the received results of network training has been carried out. The simulation of the system operation without slipping and with slipping of one of the wheels was carried out. The simulation results are compared with the mistake obtained during the training of the neural network, namely, the discrepancy between output and input signals.

Bidirectional Single-Stage Zeta–SEPIC DC-AC Converter for Traction BLDC Motors

ABSTRACT. Low battery voltage and the possibility of regeneration of braking energy are an additional important advantages of electric vehicles (EV) of low and medium power, in which simple and efficient brushless DC motors (BLDCM) are mainly used. Such results can be ensured by applying DC voltage regulation of the BLDCM using a step down/up DC-DC converter. In this work, the already known topology of the single-stage DC-AC converter based on Zeta-type converter is used, however it was developed for bidirectional ability with the obtaining of a SEPIC-type converter for the regenerative braking mode. The main attention in the work is focused on the development of a simple control system for the received object, which is described by high-order nonlinear equations. To regulate the electromagnetic torque, a single-loop current control system is proposed, which changes its structure in traction and braking modes. To compensate the dependence of this system on the angular velocity, as well as the nonlinear dynamics of the speed control loop, appropriate correctors are applied. Conducted simulations of the studied electric drive system operation at different speeds showed the effectiveness of the proposed solutions, as well as the high efficiency of the single-stage DC-AC converter.

Verification of the design methodology for configurable electromechanical systems

ABSTRACT. The purpose of the study to verify the previously created methodology for designing electromechanical systems. This methodology is based on SysML language and artificial intelligence tools such as conceptual graphs and Bayesian networks, and involves the construction of an information design model that contains knowledge about the requirements for the system being designed and a knowledge base of available technical solutions. Further, such an information model is used for automatic logical inference of technical solutions according to the requirements specified by the designer. The proposed methods and tools for design automation make it possible to trace the requirements for electromechanical systems at all stages of design, and evaluate the robustness of technical solutions to changes in these requirements.
For quick and efficient implementation of the proposed methodology in the practice of industrial design, it must be verified by evaluating the degree of efficiency, completeness, consistency and feasibility of the synthesized design solutions, the convenience of using artificial intelligence tools in the course of solving typical industrial equipment design problems. For this purpose, a configurable laboratory stand was built, which is a physical model of a simple workcell of an industrial manufacturing system.
The stand performs the typical functions of a workpieces sorter, has a modular design, and can include the implementation of specified functional requirements by various technical means. Thus, it is possible to obtain different configurations of the sorting device having differences in the sequence of operations and technical properties.
To automate the design of these configurations using the CoGui software tool, an information model was created that compares the possible system requirements for the stand with suitable variants of technical solutions. This model is used to automatically obtain descriptions of stand configurations. The performance and other properties of the resulting configurations were then tested on the operating equipment of the stand.

Hilbert transform of periodically non-stationary random signals: narrow-band high frequency amplitude modulation

ABSTRACT. Using Hilbert transform for the analysis of periodically non-stationary random signals (PNRS), is discus-sed. The narrow-band high frequency amplitude modulation is considered. It is shown that, the auto-covariance functions of a signal and its Hilbert transform are the same and its cross-covariance functions differ only by a sign, which results in an identity of cyclic spectrums of variances for analytic and raw signals. It is shown that band-pass filtering can reduces both the number of signal variance cyclic harmonics and their amplitudes.

Synthesis of an ANN-based District Heating Return Water Temperature Model Using Alternating Objective Genetic Algorithm

ABSTRACT. Achieving high accuracy of simulation of processes in a distributed heat network is a complex multi-objective optimization problem. An alternating objective approach to the synthesis of an hourly return water temperature model for a district heating source is proposed. The model is based on the RBF neural network, and is trained using a diploid genetic algorithm. It is shown, that the alternating objective approach reduces several times the number of epochs to obtain the required accuracy of the model compared to the single objective approach. The study is based on real data of heat supply in the district heating system of Kharkiv and Kharkiv CHP plant #5.

Theoretical study of the extending electric cable operation

ABSTRACT. It is shown that electrical cable systems used in mining areas experience heavy loads from their own weight, and can also be subjected to mechanical damage as a result of shifting rock layers. This leads to emergency situations at mining enterprises, which threatens the maintenance personnel lives. To compensate for tensile stresses leading to wire breakage, extension sleeves of various designs are installed on the cables. A study was made of loading schemes for sleeve flat and shell elongating elements, which showed that the shell element is a more effective component. Due to the calculation and selection the element cylindrical stiffness and of the meridian inclination angle to the symmetry axis, the best elongation effect can be achieved.

Improving efficiency energy systems - photovoltaic modules and solar collectors in construction

ABSTRACT. A method is proposed for increasing the efficiency of using energy systems (photovoltaic modules, solar collectors) due to the optimal location on the building envelope. A mathematical and graphical model has been developed, the Gelioopt program has been developed to determine the optimal orientation and area parameters for photovoltaic modules.

Active Power of Autonomous Induction Generator when Excited by a Single Capacitor

ABSTRACT. The article shows the possibility of autonomous induction generator operation with a resistive load. Self-excitation of the induction generator is carried out by a single capacitor. A load is switched on between two phases of the generator stator winding. Active power regulation in an induction generator is possible by changing the capacitance of the capacitor, the resistance of the resistive load, and the rotor speed. Power control is possible in a relatively narrow range of rotor speed and load current.

Solar Gain of the Glazing Plane Considering Influence of Nearby Structures of Unconventional Shape

ABSTRACT. A method for the determination of solar heat gain from scattered solar radiation from the sky in the shape of a spherical segment on the surface of the glazing has been developed. The geometric parameters of this model were determined. Heat gain from scattered solar radiation was determined using a mathematical apparatus of point calculus. By the point equation of the segment, a field of scanning points was obtained, according to which visualization was carried out in the Maple environment. The elementary values of solar gain were determined by known formulas within elementary pyramids, the vertices of which are located in the center of a spherical segment, and their faces pass through three or four scanning points on the segment surface. The heat flux incomes the surface of glazing in two ways. The first incomes directly from a part of sky to the fragment of glazing. The second – from a part of sky to the fragment of solar protection device, and then is reflected to the fragment of glazing. The sum of elementary values of heat fluxes determines their total value

The Problem of Determining the Level of Lightning Protection for Electrical Substations by the Risk Assessment Method

ABSTRACT. Electrical substations of 220-750 kV are objects of critical infrastructure with a complex branched technical system, various communications, and expensive equipment Current regulations provide only general concepts and calculation methods for the simplest objects; however, the issue of arranging a lightning protection system with a combination of mesh, cable, and rod lightning rods for complex power facilities has not been considered. The aim of this study was to systematize the parameters and determine the directions of research on the development of risk assessment methods for determining the level of lightning protection of existing substations with a voltage class of 220-750 kV. Using analysis and synthesis methods, the parameters influencing the risk components were identified and systematized to determine the level of lightning protection, which was performed using the risk assessment method. It has been shown that two components should be considered when determining the level of lightning protection using the risk assessment method for energy facilities: the risk of loss of human life and the risk of loss of services to the public. Areas of research with further development of the risk assessment methodology for 220-750 kV substations are outlined. The parameters for the risk assessment were grouped according to the characteristics of the energy facility, such as location, dimensions, mode of operation of personnel, and line characteristics. The transition from generalized concepts for basic parameters of the risk assessment method to terminology of power plants and substations is performed, and components and parameters that are not considered are identified, which simplifies the determination of the level of lightning protection for existing electrical substations with a voltage class of 220-750 kV

Mathematical modelling of cogeneration photoelectric module parameters for hybrid solar charging power stations of electric vehicles

ABSTRACT. The paper studies the possibility of creating local power grids for charging rechargeable batteries of electric vehicles from solar power plants based on cogeneration photovoltaic modules installed on the roofs of administrative buildings of filling stations in order to save energy obtained in a conventional way. It is suggested to use a solar power plant with cylindrical cogeneration photovoltaic modules cooled with liquid. This will enable creating hybrid solar power plants for simultaneous production of electricity and heat. A mathematical model of the surface area of a cylindrical photovoltaic converter as a function of battery parameters has been obtained. To calculate the efficiency of a hybrid photovoltaic converter, the dependency of the temperature coefficient of a cylindrical photovoltaic converter on its temperature has been derived. The results of the research are recommended for use while designing and calculating hybrid solar power plants for charging electric vehicles batteries.

Development of algorithm for the operation of a combined power supply system with renewable sources

ABSTRACT. Algorithms of forecast changes in the volume of electricity consumption from centralized and local sources as part of a combined power supply system are presented. The dependence of integrated accounting of hourly, daily and seasonal changes in electricity consumption on centralized and local energy supply systems has been developed. It is proposed to use an improved method of feasibility study of investment decisions at the stages of formalization of the technical task, based on the assessment of projected allowable costs for the construction of local power supply, which will allow consumers to have a positive economic effect and reduce the number of alternative solutions.

Coverage of load schedule peaks using power storage systems in 10 kV electrical distribution networks

ABSTRACT. The analysis of load non-uniformity in 10 kV distribution electric networks in the power system of Ukraine is presented. One of the possible directions of coverage of peak loads and in general alignment of the non-uniformity graph is considered. It is shown that one of the possible effective ways to solve this problem can be the use of storage of electricity produced at thermal power plants and nuclear power plants at night for its accumulation with the help of innovative technological batteries

Analysis ways of improving the accuracy of identification of non-sinusoidal voltages and currents distortion by means of Wavelet analysis

ABSTRACT. The criteria for selecting the optimal type of Wavelet analysis are analyzed to increase the accuracy of identification of non-sinusoidal voltage distortions, because this technique can determine the amplitude, frequency and time (duration) of the presence of harmonics in current and voltage signals. This information will be useful in assessing the technical and economic effect of the introduction of filter-compensating devices to determine the harmonics and reduce losses.

Dielectric Losses of Power High Voltage Cables in a Wide Frequency Range

ABSTRACT. A design feature of polymer-based high-voltage power cables is the presence of semiconductor shields along the conductor core and insulation to equalize the electric field on the core surface and reduce the electric field on the insulation surface. An important role in the development of power electric cables is played by research on the influence of semiconductor shields on the effective tangent of the dielectric loss angle of a three-layer insulation system, especially in the high frequency region. This is primarily due to the intensive development of networks using renewable voltage sources and the emergence of transients in such networks. The propagated surge pulses contain a wide range of components of different frequencies, which necessitates the determination of the frequency characteristics of the effective tangent of the dielectric loss angle of power cables. Experimental studies of cross-linked polyethylene-insulated cables in the high-frequency region prove the importance of semiconductor layers in determining the equivalent value of the dielectric loss tangent of the three-layer composition dielectric loss. Mathematical and physical simulations performed over a wide frequency range prove the significant influence of the thickness and electrophysical characteristics of semiconductor screens on the resulting tangent of the dielectric loss angle of high-voltage power cables. The presented algorithm for determining the effective tangent loss of a three-layer composite system is the basis for developing recommendations for reducing additional dielectric losses in a wide frequency range due to semiconductor coatings at the technological stage of manufacturing high-voltage polymer cables.

Study of Short Circuit Currents in a Distributed Traction Power Supply System with Renewable Electric Power Sources

ABSTRACT. The problems of changing short-circuit currents in a distributed traction system for using renewable energy sources were analyzed in the article. Literary sources analysis shows a further tendency for increasing the share of renewable energy sources in the total energy balance of the country and a particular increase in electricity consumption by electric traction. Goal. The main goal of the study is a method development with its practical application to impact estimation of power-boost points that connected to the traction network with energy using from renewable sources on short-circuit currents values. Methodology. The method that has developed in this study is based on well-known approaches for equivalent circuits of electrical equipment definition, but elements pair like «solar panel – inverter» it reproduces as EMF with equivalent resistance, which significantly simplifies further calculations. Results. The study results show that the application of power-boost points will not lead to a significant increase of short-circuit currents in the traction network, even if the power of photovoltaic sources will be comparable with the power of existing converting units on traction substations. This is because of the physical nature of the photovoltaic panel and its power mode, which usually closer to the current source with high internal resistance. Practical value. This also allows us to conclude that in most cases from the point of view of changing the short circuit currents, the integration of power-boost points that are powered by solar power plants is quite possible with operating sections of the traction power supply system.

Optimization of Electricity Consumption for Autonomous Monitoring Station "Theorems Dnipro"

ABSTRACT. This paper presents the results of the investigation of the power supply system of the autonomous monitoring system. The modes of operation of the autonomous automated monitoring station consumers are analysed. The most energy consuming consumers of the monitoring station are identified. Measures to reduce energy consumption of the monitoring station as a whole are proposed. It is shown that the optimization of the operating modes of the station elements can significantly (more than 6 times) reduce the total energy consumption of the station and ensure its stable operation without increasing the nominal power of solar panels and battery capacity. The described provisions received practical confirmation at a real plant put into operation at the end of 2019.

Determination of Copper Leakage Configuration in Thermal Insulation of Induction Channel Furnaces After Years of Industrial Use

ABSTRACT. Peculiarities of interrelated electrophysical and thermal processes in industrial induction channel furnaces were studied, taking into account the leakage of liquid metal into their thermal insulation after many years of operation. On the example of UPCAST furnace type for copper melting in the Comsol Multiphysics software a mathematical simulation was carried out. The three-dimensional distribution of the electromagnetic and temperature fields in the volume and on the surface of the furnace elements with different configurations of the destruction of its thermal insulation was obtained. The relationship between the size and shape of the melt leakage and the temperature distribution on the furnace lining was established. The method of determining the damage configuration of furnace thermal insulation has been improved, which, unlike the previous ones, suggests using not only the maximum value of the surface temperature at the control points, but also the temperature gradient. Since the same maximum surface temperature on the furnace body can correspond to several variants of melt leaks into insulation with different ratios of dimensional parameters, the additional determination of the temperature gradient allows to clarify the variant of the configuration that is actually observed.

The Influence of Filter-Compensating Devices on the Technical and Economic Indicators of Transformer Substations

ABSTRACT. The study of the energy consumption mode of the transformer substation in the case of a decline in the quality of electrical energy was carried out. It was found that the current flowing in the line is significantly less than the nominal one, which indicates that the line is underloaded. Economic losses caused by a decline in the quality of electric energy for the actual and calculated regimes for ten years, taking into account the increase in the cost of electric energy, are calculated. The installation of filter-compensating devices on the busbars of the transformer substation in order to improve the quality of electrical energy is proposed. The economic feasibility of the proposed technical measures using discounted estimates methods was determined.

Method of hand movement disorders determination based on the surgeon’s laparoscopic video recording

ABSTRACT. In this paper a method of hand movement disorders determination based by testing laparoscopic trainer system LAP-X Hybrid with the surgeon’s video recording was developed. A software that divides a video recording frame by frame and determines deviations from the norm in it based on specified parameters was developed. The implementation of video analysis of recorded video tests by surgeons was carried out using the methods of a computer zoo with the connection of the OpenCV library.

Descriptions of the Process of New COVID-19 Virus Infection and Transmission Using the Idea of Splicing LEGO Bricks

ABSTRACT. The Idea of splicing LEGO bricks is proposed for describing the structure of a composite viral infection, which makes it possible to explain the possibility of a recurrence of the disease and the pattern of peaks in the spread of the disease. Comparing the RNA sequences/fragments of a virus to LEGO bricks, the number of LEGO bricks an individual acquires can be used to estimate the probability of disease and death for that individual. The aim is to advise and help public health security develop appropriate measures to reduce infection, recurrence and death from disease during a pandemic. The purpose is to provide the basis for recommendations and measures developed for public health safety to reduce disease infection, recurrence and death during a pandemic.

Pre-sowing treatment of sunflower seeds in a magnetic field

ABSTRACT. Pre-sowing treatment of sunflower seeds in a magnetic field improves its sowing qualities, plant biometrics and yield, which can be explained by increasing the rate of chemical reactions in seeds, solubility of salts and acids, permeability of cell membranes, increased transport of ions, oxygen and water. Based on the obtained analytical dependences and experimentally the regime parameters of sunflower seed treatment and their optimal values was determined: magnetic induction 0.065 T, magnetic field gradient 0.57 T/m (pole division 0.23 m), fourfold re-magnetization, seed velocity 0.4 m/s, which provides energy dose of seed treatment 3.8 J·s/kg. It is established that the change in the biopotential of sunflower seeds can determine the efficiency of their treatment in a magnetic field and determine the change in activation energy, which does not exceed 3.28 kJ/g-eq. Using the optimal parameters of sunflower seed treatment in a magnetic field, an device for pre-sowing treatment of sunflower seeds in a magnetic field was designed and manufactured, the use of which increases germination energy by 28 %, germination by 24 %, sunflower yield by 26 %.

Multiphase Compartment Models of Distribution of New Coronavirus Infections.

ABSTRACT. A fundamentally new multiphase compartmental mathematical model for predicting the spread of several waves of coronavirus infection has been developed. Quality indicators in comparison with existing single-phase models are analyzed. The developed model will allow to model several waves of the process of spreading new coronavirus infections, to predict the process of loading the medical system, as well as the needs for staff, equipment and hospital beds during pandemics.

Simple Wound Healing Simulation Program Based on Mathematical Model of Angiogenesis

ABSTRACT. In the present work the existing one-dimensional mathematical model of wound healing angiogenesis was wrapped into the computer program with a convenient interface. The model considers two variables: capillary tip density and endothelial cells density. The model is continuous and consists of two PDEs. Our program allows to find the speed and the time of wound healing as well as the distribution of the variables at any stage of healing, from the small set of measured (or estimated) input parameters. The usage of the program was demonstrated on the different sets of input parameters: those that considered to be “normal” ones and “pathological” ones.

Application of binary classification of magnetic resonance therapy images to detect the threat of the disease due to COVID-19

ABSTRACT. The paper considers the use of a neural network for the binary classification of magnetic resonance imaging images to establish a possible disease of COVID-19. Processing of input data and their reduction to one format is provided, and neural network software for binary classification is developed and its training based on about 60,000 open patient images. The developed software does not require additional training of doctors and can be used according to the user's instructions. This approach makes it universal in use by both doctors and ordinary Internet users.

Possibilities of field formation by permanent magnets in Magnetic Stereotactic Systems

ABSTRACT. Abstract—In this paper, the possibility of forming a magnetic field from permanent magnets in a magnetic stereotaxic system is introduced. The strength and direction of the magnetic field of the electromagnetic coil and the permanent magnets are calculated by the simulation software, and the non-contact movement of the permanent magnets is studied by the microcontroller.

Acquisition of digital medical competences by foreign students in medical education: a comparative analysis

ABSTRACT. Digitization of all spheres of society's activity caused not only the emergence of a new quality of digital services, but also a digital revolution in the field of health care, which implies the need to increase the level of digital competence in the context of the professional activity of future doctors, and therefore also in the context of their professional training. The purpose of our work is to study the acquisition of digital competences by foreign students of higher medical institutions of Ukraine, using as an example the acquisition of digital competences during the study of the educational component “Medical Informatics”. 120 full-time students, namely, 60 students from India and 60 students from Arab countries (Egypt, Yemen, Jordan, Lebanon, Morocco, UAE, Syria and Sudan) took part in the study. The statistical analysis of the study shows that the differences in the results are not accidental, and therefore the developed model of training future doctors based on the educational component "Medical Informatics" for the use of digital health tools in professional activities should be considered effective. Our study shows that students from Arab countries have better indicators related to digital health competencies than to information competencies, where their level of competencies is quite low. In general, the assessment of the level of digital health competence of Indian students is not only higher, but also less diverse. The results of the research show that medical students in both groups have developed a solid basic understanding and basic informational and digital medical competencies, which help not only in theory, but also have great practical importance in training and in everyday life.

Acousto-magnetic excitation of a local electric field in a biological substance for diagnostic and therapeutic purposes

ABSTRACT. The possibility of using acoustic-magnetic influence for remote excitation of electric current and determination of the acoustic resistance of local sections of the biological substance for the purpose of diagnosis and treatment was established as a result of calculations and experimental studies in model samples of the substance.

Possibilities Theoretical And Natural Models For Determining The Coefficient Of Human Aerodynamic Nose Resistance

ABSTRACT. The paper presents a comparative analysis of mathematical and full-scale models in determining the aerodynamic nose drag coefficient. According to the results of experimental tests of a full-scale model obtained by 3D printing, it is possible to calculate the value of the aerodynamic nose drag coefficient by obtaining the pressure drop values total losses for the corresponding given air flow rates. The discrepancy between the values of the aerodynamic nose drag coefficients in this case did not exceed 15% and is explained by methodological errors associated with the approaches in calculating the aerodynamic model of the nasal cavity, in particular, the impossibility of taking into account all local disturbances and their mutual influence, and the properties of the plastic surface of the air channels of the full-scale model during experimental tests

The Use of Drones to Improve the Efficiency of Using Telemedicine Systems in Emergencies

ABSTRACT. The provision of primary health care to patients in emergency situations has common characteristics that dramatically increase mortality and disability rates in the population. One of these factors is the inaccessibility of the emergency area, which is typical for emergencies and disasters. For better quality medical care in emergency areas, the most effective was the integrated use of airmobile and telecommunication technologies. The authors analyze the possibility of increasing the efficiency of telemedicine complexes using airmobile and telecommunication technologies, as well as the features of using drones to solve telemedicine problems.

ABSTRACT. Diabetes is one of the leading causes of death. This is due primarily to the individual nature of the course of the disease. The algorithm of the therapy procedure (insulin administration) is determined by the doctor based on model ideas about the dynamics of the glycemic regulation process. Existing models have limitations associated with the complexity of taking into account the individual characteristics of the patient and the limited number of controlled parameters of the human body. Therefore, the development of more adequate models of glycemia and algorithms for insulin administration, which allow taking into account the current state of the patient, is an urgent task. The aim of the work is to develop the theory of mathematical modeling of complex systems and to develop an adaptive algorithm for the operation of an implantable insulin dispenser based on the proposed model of the dynamics of glucose levels in human blood. To substantiate the model of glycemia, methods of structural and parametric identification of models of homeostatic systems in the class of differential and integral equations were used, which makes it possible to obtain a model that reproduces the data of experimental studies. To test the effectiveness of the developed algorithm, experimental data on the dynamics of glycemia in patients with type 1 diabetes mellitus were used. Numerical experiments have shown the effectiveness of the proposed model of human blood glucose dynamics for developing an algorithm for normalizing glycemia using an implantable insulin dispenser. The advantage of the proposed algorithm is the ability to maintain the patient's blood glucose level regardless of the diet. As a result of numerical experiments, the effectiveness of the developed model of the dynamics of the level of glucose in human blood was shown in the case of its known dynamics. The introduction of insulin in accordance with an individual algorithm developed on the basis of the model makes it possible to normalize the concentration of glucose in the patient's blood, regardless of the diet, unlike existing insulin dispensers that work according to a strict program and require adherence to dietary regimes.Diabetes is one of the leading causes of death. This is due primarily to the individual nature of the course of the disease. The algorithm of the therapy procedure (insulin administration) is determined by the doctor based on model ideas about the dynamics of the glycemic regulation process. Existing models have limitations associated with the complexity of taking into account the individual characteristics of the patient and the limited number of controlled parameters of the human body. Therefore, the development of more adequate models of glycemia and algorithms for insulin administration, which allow taking into account the current state of the patient, is an urgent task. The aim of the work is to develop the theory of mathematical modeling of complex systems and to develop an adaptive algorithm for the operation of an implantable insulin dispenser based on the proposed model of the dynamics of glucose levels in human blood. To substantiate the model of glycemia, methods of structural and parametric identification of models of homeostatic systems in the class of differential and integral equations were used, which makes it possible to obtain a model that reproduces the data of experimental studies. To test the effectiveness of the developed algorithm, experimental data on the dynamics of glycemia in patients with type 1 diabetes mellitus were used. Numerical experiments have shown the effectiveness of the proposed model of human blood glucose dynamics for developing an algorithm for normalizing glycemia using an implantable insulin dispenser. The advantage of the proposed algorithm is the ability to maintain the patient's blood glucose level regardless of the diet. As a result of numerical experiments, the effectiveness of the developed model of the dynamics of the level of glucose in human blood was shown in the case of its known dynamics. The introduction of insulin in accordance with an individual algorithm developed on the basis of the model makes it possible to normalize the concentration of glucose in the patient's blood, regardless of the diet, unlike existing insulin dispensers that work according to a strict program and require adherence to dietary regimes.

Peculiarities of processing biomedical signals by methods of nonlinear dynamics

ABSTRACT. The application of human security contributes to a comprehensive response to the multidimensional causes and consequences of complex problems. To develop methods for timely diagnosis and prediction of heart disease in a proactive approach along with existing methods requires the use of alternative methods that complement traditional analysis of heart rate variability in time and frequency domains. The paper proposes the use of nonlinear dynamics methods for the analysis of heart rate variability, which gave a new idea about changes in heart rhythm in various physiological and pathophysiological conditions. The use of the proposed methods provides additional prognostic information and complements the traditional analysis of heart rate variability, because it is the change in the dynamics of heart rate variability and heart rate that has prognostic value for disease progression (eg, coronary heart disease) and mortality (for example, after an acute myocardial infarction). Conversely, heart rate variability indices are limited in the ability to distinguish between pathophysiological conditions or patients. However, when applied to an individual human for a certain period of time indicators may be clinically useful, differentiating disease progression.

The influence of electromagnetic fields of the surrounding environment on the condition of patients with cerebral ischemic stroke: the study on level of cells

ABSTRACT. Electromagnetic radiation is used both in household electronic devices and in diagnostics and treatment. In addition to the positive impact, there are side effects of the impact of electromagnetic radiation on living objects. Blood cells, in particular red blood cells, are the targets of such influence. Further destruction of cells can become a source of inflammation or chronic disease. The method of dielectrometry allows you to obtain information about the structure of molecules, geometric shape, size and water content in membranes and pre-membrane layers, and structural changes that occur under the influence of external factors. This study presents data on the effect of electromagnetic radiation in the 36.64 GHz range, used in various radar systems, radars for fire control systems and in anti-aircraft artillery systems on ships, on the state of red blood cells of people who have suffered the cerebral ischemic stroke. The results of the dependence of the dielectric parameters of the real and imaginary parts of the complex dielectric permittivity in different temperature ranges for the suspension of red blood cells of donors (control group) and red blood cells of patients who suffered the cerebral ischemic stroke (experimental group) was found. Red blood cells of experimental group were exposed to microwaves in the 36.64 GHz range (frequency of the Ka band) for 30 s. Dependencies of static dielectric constant at different temperature loci were obtained for red blood cells for donors and patients with ischemic stroke. The value of the specific conductivity of red blood cells for the control and experimental groups under the influence of the frequency of the Ka band was found.

Telemedical System for Monitoring the Psycho-Neurological State of Patients in the Process of Rehabilitation

ABSTRACT. Telemedical system for monitoring the psycho-neurological state for rehabilitation is evolving for assessment and supervision of various neurological syndromes. Persons with disabilities are not a homogenous group, they are facing multiple problems in their daily life. Common problem of people with disabilities and old aged people is that they have lacked access to basic services. Nowadays researchers are focused on human computer interaction-based rehabilitation technologies that bring social-emotional intelligence closer. The paper is designed to achieve cognitive rehabilitation using machine learning approaches for disabled and elderly people. Electroencephalograms are used to monitor brain activity of the human brain and Kinect sensors are used to track users’ movements. Chebyshev filter used to remove noise, for feature extraction Autoencoder technique is used, and classification is done by Transfer learning based Convolutional neural network with 95% and above accuracy. The proposed system will be applied in real time to achieve a better quality of life for disabled and elderly people.

Computational analysis of viscoelastic deformation of human blood vessels with a plaque of statistically predicted size

ABSTRACT. Viscoelastic deformation cycles of human blood vessels under normal functioning conditions were studied. Atherosclerotic plaque with stochastic development was also taken into account in the modeling. A computer simulation algorithm has been developed to perform parametric analysis for models with different geometrical dimensions. The study was carried out in a two-dimensional formulation based on the finite element method.