Parallel processing applied to high frequency electromagnetic field analysis

W artykule przedstawiono algorytmy równoległe, mające zastosowanie w metodzie FDTD (ang. Finite-Differences Time-Domain), będącej jedną z najpopularniejszych metod analizy pola elektromagnetycznego wielkiej częstotliwości. W pracy przedstawiono metodę dekompozycji analizowanej przestrzeni, jak również algorytmy dekompozycji programu na zespół współbieżnych wątków. Ze względu na szczególne zainteresowanie autora algorytmami mającymi zastosowanie w klastrach komputerowych, przedstawione będą wyniki doświadczeń, uzyskanych w czasie testów wydajności programu równoległego, opartego na dekompozycji przestrzeni w wersji podziału "plastrowego". Zdecydowano się na przedstawienie algorytmów zaimplementowanych w klastrze homogenicznym, jak również w heterogenicznym - przy wykorzystaniu dodatkowego algorytmu dynamicznego podziału obszaru analizy.The paper contains parallel algorithms applied in the FDTD method, which is one of more popular ways of electromagnetic field of high frequency analysis. The work shows algorithms which decompose a program into a group of parallel threads, and a method of the analyzed area decomposition. The first type of algorithms enables achieving good speedups and makes it possible to use e.g. graphic cards in computations conducted with the use of the FDTD method. Whereas space decomposing algorithms help enlarge the analyzed area represented by a grid of elements built of electromagnetic field components presented in a differential form. Thanks to that it is possible to compute areas of great capacity, greater than the com-putational abilities of a single PC unit. The work focuses on presenting the results of efficiency examination of the parallel program based on this method. The author decided to show algorithms implemented on a homogeneous cluster, as well as in a heterogeneous one-with the use of an additional dynamic decomposition of the analyzed area

Flight parameters visualization and monitoring module applied in an unmanned aerial vehicle

W niniejszej pracy przedstawiono inżynierskie rozwiązanie systemu do zdalnego monitorowania parametrów lotu bezpilotowego aparatu latającego. W treści artykułu zawarto omówienie poszczególnych kroków realizacji modułu wizyjnego oraz oprogramowania służącego do rejestracji obrazów z kamery pokładowej. Przedstawiono także sposób dekodowania sygnału przesyłanego za pomocą modulacji FSK (Frequency-Shift Keying).The work presents a simple engineering solution for remote monitoring of unmanned aerial vehicle flight parameters, based on the camera equipped with the OSD system. The article includes discussion of the particular steps of creation of the module and software for video recording images from a camera installed onboard. Moreover, the way of signal coding with the use of frequency-shift keying modulation is presented

Mechanical and electrical impedance matching in a piezoelectric beam for Energy Harvesting

A piezoelectric beam is one of transducers for energy harvesting. It provides easy implementation and good performance in changing mechanical stress into electric voltage. In order to maximize output power, it is important to provide mechanical and electrical impedance matching. In the paper the authors proposed a methodology which allows to find values of lumped elements in an electromechanical model after completing appropriate measurements. Due to linear equations, it is possible to model a beam in both mechanical and electrical ways, and match the best load depending of frequency. The proposed model of a piezoelectric cantilever shows a potential use of these devices in micro scale as a cantilever which is a part of a silicon structure. Moreover, in the paper, the authors discuss mechanical aspects of using a weight as the way to tune the piezoelectric beam to a specific frequency. The electrical aspect of matching the source impedance with load, which is based on an electrical model of a piezoelectric transducer, is also presented. In the paper a mathematical model was verified by an experiment in which a laboratory stand equipped with a vibration generator, a piezoelectric energy harvester and acceleration sensors was used

The calibration process and metrological analysis of a transducer used to measure two physical quantities

This article presents a way of calibration of an unconventional two-current circuit, named 2J+2R, which consists of two current sources and two referential resistors connected to the circuit mass. This bridge was used to measure the beam deflection and the temperature increase simultaneously with the use of a pair of metal strain gauges. This paper contains theoretical and corrected (after calibration) processing characteristics of the measurement circuit. Calibration coefficients of both inputs, responsible for measurement of the measured values in the places where the strain gauges are attached, were calculated. Moreover, the standard combined and expanded uncertainties of both calibration coefficients were calculated and an uncertainty budget was made

The correct method of measuring flow curve and its parameters by uroflowmeter

Представлена конструкция урологического инструмента – так называемого урофлоуметра, созданного авторами статьи. Использован тензометрический сенсор массы с автоматическим способом измерения, соединенный с компьютером через интерфейс RS 232. На основе измеряемой в определенном промежутке времени массы вычисляются все необходимые параметры. Показан способ оценки неопределенности результатов регистрации акта мочеиспускания и их параметров.Надана конструкція урофлоуметра, розробленого авторами статті. Використано тензометричний сенсор ваги з автоматичним процесом вимірювання, що з’єднаний з комп’ю¬тером гніздом RS 232. на основі ваги, що вимірюється за певний проміжок часу, розраховуються всі необхідні параметри. Показано спосіб оцінки невизначеності результатів реєстрації акту сечевиділення та його параметрів.In this paper the construction and measuring truck of uroflowmeter is presented. The strain gauge sensor with amplifier and A/D converter make an independent instrument which is connected to PC by RS232. On the base of mass measures which are done in defined time the flow curve and all necessary parameters are calculated. The method of expression of uncertainty in this case is mentioned