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In this paper the problem of design optimization of a microwave wearable antenna is investigated. Reference is made to a specific antenna design that is wideband vee antenna which is characterized by 6 geometrical parameters. Those parameters were automatically adjusted with an evolution strategy based algorithm to obtain the impedance matching of antenna located in the proximity of the human body...
A novel stochastic finite-difference time-domain (S-FDTD) technique is presented in this paper for the precise and rapid assessment of electromagnetic field statistical properties. The featured algorithm is systematically verified through detailed comparisons with the results obtained via existing, yet rather resource (CPU and memory) consuming, Monte Carlo-FDTD and other stochastic implementations.
Topology optimization is one of the mathematical methods for finding the optimal structure of electrical machinery. Because topology optimization can make a design with much higher degree of freedom in terms of structure than other optimization methods, there is a possibility for achieving a completely new shape that is not limited to the conventional model. The optimized structure is strongly dependent...
Technical condition of large power transformers has large impact on reliability of a power system since they are the connection points for generators and distribution system. Power transformers can experience various faults that can disrupt their reliable operation such as mechanical defects caused by magnetostriction or electrodynamic forces. Magnetostriction is a phenomenon occurring in transformer...
This paper presents a summary of a vibrational behavior investigation of a 27 slots / 24 poles combination surface mounted synchronous electric motor. To achieve this investigation, first, an electromagnetic analysis is done using a quasi 3D finite element model allowing to consider the rotor skewing and to compute the machine magnetic quantities. Second, a modal analysis is done using a 3D FE structural...
Carbon nanotubes (CNTs) are long cylindrical structures of carbon atoms hexagonal connections and having the aspect ratio higher than 1000. For immense electrical and mechanical properties, great specific surface and high thermal and chemical stability, since Ijima discovery in 1991 [1], carbon nanotubes attracts great attention among many research groups because due to possible applications. CNTs...
This paper presents a methodology to increase the transmission lines (TLs) capacity and, simultaneously, decrease the intensity of electric field produced by its conductors in the ground level. A methodology for ascertaining whether Corona Loss is within acceptable limits is also developed. Such method aims to improve the performance of the TLs and it is based on analytical electromagnetic modeling...
Magnetic pulse welding (MPW), Crimping (MPC) or forming (MPF) are very promising technologies based on pulsed magnetic field using a magnetic pulse generator. This paper aims to study the current and temperature distribution produced by an intense pulsed current in a massive one turn coil. The study involves a 3D numerical simulation model of the coil in LS-DYNA® based on Maxwell equations and Finite...
BCI mental tasks (hands movements and words imagination) classification becomes a challenging task of EEG signal processing and analysis. State-of-art approaches bother with spatial, unstable structure of highly noised EEG signals. Presented approach not only provides spatially dedicated convolutional neural network (CNN) architecture but also adaptively optimize method parameters. Provided method...
A mathematical model of electrically charged plastic particles movement in the free-fall electrostatic separator is discussed based on the theoretical analysis and experimental observation. The formulated model considers both field-to-particle and also particle-to-particle interactions and takes into account stochastic characteristics of the model parameters. Simulation of particle motion, therefore,...
Vehicles and billion other physical devices are today enriched with electronics, sensors and software that enable data collection and exchange. At the same time, Internet-of-Things initiates a new era where the world will change deeply and decisively in many ways. In this context, both industry and research community attempts to merge engineering and artificial intelligence. This direction considers...
Vacuum switching devices (circuit breakers and contactors) dominate the current market of medium voltage devices. In the paper a classification of electromagnets and actuators which are used in MV vacuum switching devices is presented. Peculiarities, advantages and disadvantages of bistable and monostable electromagnets and actuators are analyzed. Information on the developments of the authors as...
In this paper, a new hybrid model is proposed to control the DC/DC converter of Grid Connected Photovoltaic System. The approach used to build the developed controller is divided into three steps, the first step is to generate a data based on the fuzzy logic controller (FLC), the second step is to choose an artificial neural network (ANN) structure to model the FLC and the last step is the training...
In this paper an optimization method of a dual-band wearable antenna is presented. The antenna geometry is described with 8 geometrical parameters that are automatically adjusted with the use of a evolutionary algorithm to obtain the impedance matching of antenna located in the proximity of a human body. The antenna has been designed to operate in the ISM band which covers the frequency range of 2...
In the paper, the Wind Driven Optimization WDO algorithm is applied to the optimal shape design of a class of switched reluctance motors. The goal of the optimization is to identify a class of geometries which maximize the torque and simultaneously minimize the iron losses of the motor. Because of the twofold design criterion, the multi-objective version of the wind driven algorithm M-WDO is used...
Computer simulation of temperature field control system of induction heating object, for example for prediction purposes, encounter difficulties associated with the system nonlinearity on the one hand and time of calculation on the other hand, when numerical analysis of magneto-thermal field, especially 3D, is used. The paper presents the methodology of fast simulation the temperature field of complex...
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