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In this paper frequency characteristics approximation methods are presented. Model which is to be reducing is delay-less SISO described by 100 state variable.
In this paper, results of a study on acoustic emission (AE) signals, which arise during partial discharges (PDs) generation inside a transformer tank filled with synthetic oil, are described. The Rogowski coil is used to determine the propagation time. The signals are registered as a function of time.
This paper presents a new modification of the least squares Prony's method for power quality analysis in terms of estimation of harmonics and interharmonics in an electric power signal.
A computer based system for acoustic emission signal generation is presented in the report. Applied signal frequencies are in the range from 1 kHz to 1 MHz. The digital signal amplitude equals š12 V. The acoustic wave is invoked by a piezoelectric transducer and may have an arbitrary shape.
The purpose of this article is to present basic features of vector extensions introduced in the x86 family of processors. In order to compare the speed of programs using the vector extensions with those using scalar data, a few programs are developed, in particular programs performing operations on graphical BMP files, counting the indicated integral using the rectangles method and generating fractals.
This paper describes the Omnet++ as an objective-oriented environment for computer networks simulation. It is a full programmable and modular environment and it was designed for networks modeling support. It has powerful graphical tool that allows to represent running simulation. It is open-source and free project for non-commercial use.
The article presents the possibility of an application of the Rogowski coils to diagnostic the electrical motors. The metrological values of the coils make them fully useful to diagnostic of motors.
Dynamic light scattering (DLS), known also as photon correlation spectroscopy, is being used as a helpful tool at the research where measuring of the size of particles in liquid is necessary. Technology of breaking a monochromatic light beam and changing it's wavelength by (Brownian) motion of particles which the light stream has been sent to.
The paper presents an analysis of influence of operation frequency on losses in a winding of a choke inductor in DC - DC step - down switched mode converter. A field - circuit finite element model of the converter is used to compute winding losses of an inductor.
The paper presents a design project of measuring system to detection of partial discharges phenomena using in mobile inspection robot. A description include specific futures of the sensor and proposition of realization in support new freely available technology.
The article presents methods for identifying chemical compounds on the basis of their spectrums in Infrared. Specifically, transformation of the spectra from absorbing to transmitting ones and vice verse and calculation of the so-called base line and the maxima of the spectra are considered.
The influence of mesh density on the magnetic field solution has been presented. Many meshes with different densities have been chosen for comparison of the calculation results. The force acting on magnetic bearing has been determined for different meshes in respect of computing error and calculation time for the simulation.
The paper presents the commutation algorithms used for the brushless direct current motors with discrete sensors of rotor position. The commutation algorithms using a 120 and a 180-degree conduction mode of power transitors are tested. The algorithms are implemented and tested on the constructed laboratory test-stand.
In the paper, a measurements of fullerene dissolution in mineral transformer oil are analized. The proposed method uses UV absorption as dissolution indicator.
The article presents advantages of using parallel computing in solving engineering problems as well as author's remarks about legitimacy of using this technology.
A diesel combustion engine is a nonlinear dynamic plant whose operation is accompanied by the processes of energy and mass accumulations. A result of the processes is production of power, but a by-product is the emission of harmful substances in exhaust gases to the environment. Therefore, many research centers are seeking technical solutions to improve this problem by modifying the diesel engine...
The paper describes the test results on the laboratory on prototype permanent magnet synchronous motors (PMSM). The advantages are demonstrated of those motors in comparison with induction motors.
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