The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The paper substantiates the concept of building a three-phase model of the electric arc furnace in the instantaneous coordinates. The computer Simulink model of the electric mode of the electric arc furnace was developed. The results of testing the developed model are presented, the analysis of which shows that the required precision of the match between the experimental and simulated processes of...
The article proposes a new method of digital loop control based on the sharing of digital PID control formula, characterized by preventive assessment of the control object during each control cycle to select the control action. The selected control action for a subsequent control cycle corresponds to the discrete PID control formula that will ensure the best dynamics control parameter during the next...
The power generated by photovoltaic (PV) systems is highly dependent on operating and environmental conditions. In order to increase the efficiency of PV systems, several methods have been developed to track the maximum power point (MPP). This paper proposes an analytical method that introduces a new expression for the extraction of the value of voltage and current at MPP based on the five parameters...
A large signal non quasi static (LSNQS) compact model has been developed, implemented and applied to the simulation of organic thin film transistors (OTFTs) and test circuits realized with a printed organic CMOS process. The model is based on the current continuity equation discretized by using a spline collocation approach. The model is well suited for the simulation printed OTFTs since it assumes...
The program environment for electromechanical system analysis based on object-oriented approach and authorial method of mathematical modeling is presented. This environment allows constructing computer models of comprehensive electrotechnical systems with semiconductor converters. Such computer models are distinguished by the high operation speed and ability of real-time operation in interaction with...
The paper deals with a single-phase induction machine operating as a stand-alone self-excited single-phase induction generator for generation of electrical energy from renewably energy sources. By changing number of turns and size of wires in the auxiliary stator winding, considerable improvement of performance characteristics of the generator were obtained as regards no-load and load voltage of the...
Fast and stable processing optimized for given simulation problem is essential for any modern simulator. It is characteristic for electronic circuit analysis that complexity of simulation is given by circuit size and used device models. Implementation of electronic device models in program SPICE uses traditional functional paradigm allowing fast computation but further modification of model can be...
In the paper the approaches how to develop models of electrotechnical objects using the test example of two-winding transformer are discussed. A comparing of the continuous model created using the description of physical processes and discrete macromodel obtained using the “black box” approach based on field experiment are carried out. It is shown that the model obtained using the “black box” approach...
We present EMI simulations of a silicon carbide MOSFET traction inverter. The simulations are based on a transient circuit simulation and frequency domain simulations of different 3D geometry models. In a first step, an equivalent circuit is derived from parts of the geometry model and combined with an analytical model of the MOSFETs and an equivalent circuit model of the DC link capacitor. The results...
The use of virtual simulation in industrial design and validation processes has considerably increased over the last years, due to better algorithms, affordable computational power with good performance and gradual acceptance of its results by technical experts. Nevertheless, although electromagnetic simulation has also evolved, it still does not have the same penetration in validation processes as...
The paper considers the constructing issue of ontology for the GMDH-based inductive modeling domain. It examines the main components of the GMDH algorithms in terms of their synthesis for designing the domain ontology. Such ontology significantly expands opportunities for construction of inductive modeling tools for model building and forecast of complex processes of different nature.
Using analytical calculations, a precise large signal equivalent circuit model of square CMUT dynamics was developed. The model predicts many intrinsic properties of a square CMUT cell including resonance frequency, phase and magnitude of the membrane displacement, membrane velocity, electrical conductance, collapse voltage, etc. ANSYS 3D finite element analysis (FEA) was used to validate the equivalent...
Induction machines for traction applications are operated at working points of high ferromagnetic saturation. Depending on the working point, a broad spectrum of harmonic frequencies appears in the magnetic flux density of induction machines. Detailed loss analysis therefore requires local and temporal highly resolved nonlinear field computation. This loss analysis could be performed in the post processing...
An efficient and unconventional modelling approach is established for the investigation of power delivery network (PDN) constituted by a multilayer printed circuit board (PCB) structure. The proposed model is applied to the power integrity (PI) analysis through a PDN structure with power/ground planes, vias and decoupling capacitors. The modelling methodology is based on the tensorial analysis of...
The ribbon microphone lends itself as a good example to use for education of multi-physics computer modeling and simulation. The value of the ribbon microphone as teaching aid can be extended by adding a transformer and electronic amplifier to the model. The complete model can be used to illustrate the importance of impedance matching and noise suppression.
Smoothed Particle Hydrodynamics (SPH) is a numerical method for fluid flow modeling, in which the fluid is discretized by a set of particles. SPH allows to model complex scenarios, which are difficult or costly to measure in the real world. This method has several advantages compared to other approaches, but suffers from a huge numerical complexity. In order to simulate real life phenomena, up to...
An accurate nonlinear lumped equivalent circuit model is used for modeling of capacitive micromachined Ultrasonic Transducers (CMUTs). Finite element analysis (FEA) is a powerful tool for the analysis of CMUT arrays with a few number of cells while with the equivalent circuit model, the entire behavior of a large-scale arbitrary CMUT array can be modelled in a very short time. Recently, an accurate...
An averaged state-space model of the coupled inductor double boost converter (C2B) operating in discontinuous conduction mode and without considering losses is presented in this paper. Differential equations depend on the time intervals lasted by the interchange of energy between the magnetic elements. Thus, expressions that permit to estimate those values as a function of the averaged states are...
Characterizing neural responses and behavior require large scale simulation of brain circuits. Spatio-temporal information processing in large scale neural simulations often require compromises between computing resources and realistic details to be represented. In this work, we compared the implementations of point neuron models and biophysically detailed neuron models on serial and parallel hardware...
Thermal issues become serious bottlenecks for high-end and mobile ICs as well. To analyse the temperature dependent behaviour, functional-thermal co-simulation can be performed. We are developing a framework called LogiTherm which can be used to perform such simulation of digital and mixed signal circuits on different abstraction levels. The framework utilizes the so-called simulator coupling technique...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.