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The paper presents a part of the research results connected with the scientific work relating to the determination of the algorithm of the tram vehicle control according to the criterion of the minimum electrical energy consumption. By way of example for the modernized tram of type 105N with choppers in the driving system, the problem of traffic time-lag liquidation by energy saving ride has been...
This paper presents a novel zero voltage transition (ZVT) boost converter that can be used in the photovoltaic (PV) array sources to reduce the switching losses. The auxiliary circuit used in the proposed converter is implemented by using only one auxiliary switch and a minimum number of passive components without an important increase in the cost and complexity. The main advantage of the proposed...
In the paper the LabVIEW application designed for simulation of the operation principle and virtual investigation of binary weighted digital to analog converter (DAC). is presented. The application permits performance virtual experiments thanks to the possibility of the modification of the DAC electronic circuit parameters. The application can be used both for education and for specific research purposes.
Examples of measurement results concerning the influence of selected disturbance factors on the accuracy of readings of single-phase Watt-hour meters were presented in the paper. The research was realized on a designed measuring position. The measuring position makes it possible to set selected disturbance factors. The influence of voltage drop, temperature and strong magnetic field on the measuring...
The paper presents calculation of two-dimensional distribution of current density in three-phase circuits with geometrical asymmetry by means of the boundary element method, taking into consideration proximity effect and skin effect. Moreover, the paper includes example calculation results of the current density distribution of some definite systems.
The computer measurement system used for testing electrical and magnetic properties of superconductors was presented in this article. The main system's modules are: measurement module, sources control module and cryostat control module. The IEEE-488 bus is the main digital communication bus used in the presented system. All modules are controlled by the computer program prepared specially for the...
The paper describes the idea of searching the space of 2D cellular automata rules using the graphs of connections. Nodes are the "one" cells in the configurations for which the rule takes the value "1". Branches of a graph connect all "ones" in given configuration. The same graph when only rotated or mirror reflected is connected with group of rules, which generate the...
In this article a simulation model of 1 -phase voltage inverter and its control system is described. Experimental model of this inverter is presented also, especially taking into consideration digital control system, based on ALS-MOD21K board. Chosen results of simulation and experimental researches are shown as well.
In this paper the authors propose using dynamic (optimizing) artificial neural networks as well as interactive environment MATLAB to correct nominal parameters of active filters of higher ranks with a simultaneous process of optimization of a circuit designed [8, 9]. The MATLAB's [3, 15] capabilities of fast constructing and testing algorithms of artificial neural networks as much as a verification...
The paper includes proposals of formulation of photovoltaic module models based on the measurement data obtained during faultless operation of the considered object. With the use of the application the coefficients of the models describing the faultless operation of the considered object have been determined. A multidimensional approximation with optimization has been used, that consisted in minimization...
In the article the selected methods of modeling radiative energy transfer in participating media were compared. Calculations were performed for furnace chamber filled an absorbing-emmiting gas. Accuracy and duration of calculations using different methods were compared.
The simplification of calculations with assuring the sufficient accuracy in making tomography images of analyzed physical phenomenon should succeed in faster obtaining of results. This issue is important because the contemporary tomography is expected to bring real time, tomography images of dynamically changing environment. Taking into consideration growing ecology and safety demands, there is a...
In the paper, two examples of use of computer tools in design work on lighting systems covering complex catoptric systems of lighting fittings and extensive illumination systems are presented. In both cases, application of numerical calculation methods allows to analyze large numbers of test rays reflected from optically active surface of the catoptric element or from the object's elevation. As a...
In the paper some possibilities of using the HSV colour space for the multichannel nage filtering are analysed. The most typical problem with the hue component is its circular character, so for the adaptive filtration the appropriate choice of the "starting" point, known from the conditional ordering, is proposed. Such approach can be useful also or some other colour median filtering methods...
A layout of the pulse generator dedicated for fault location of three conductor coupled power lines is presented. The generator offers three outputs. The first output applies a probing pulse to the selected line while the remaining adjacent conductors are short-circuited in order to eliminate the induction of pulses at the moment of delivery of the testing pulse. Such procedure improves the process...
In this paper issues related to vibration suppression in the drive system with an elastic joint are presented. The control structure with a state controller is considered. During the design the mathematical model of the torque control loop is taken into consideration. The influence of the neglected dynamics of torque control loop on the drive performance is shown. To provide the information of non-measurable...
The paper presents continuation of work [14]. In the paper a stability analysis of nonlinear analog phase-locked loop with the fourth order Butterworth lowpass filter has been made. The stability analysis of the loop has been done using the first Lyapunov method. Presented results were illustrated by example.
Face pose determination represents an important area of research in Human Machine Interaction. In this paper, I describe a new method of extracting facial feature locations from a single monochromatic monocular camera for the purpose of estimating and tracking the three dimensional pose of human face and eye-gaze direction.
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