Wyniki wyszukiwania - Biblioteka Nauki

1

Model analityczny silnika przełączalnego reluktancyjnego (SRM) na potrzeby optymalizacji jego konstrukcji

100%

Majchrowicz M.

Elektrotechnika i Elektronika

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2007

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tom T. 26, z. 1--2

46-53

PL

W artykule przedstawiono sposób modelowania indukcyjności uzwojenia fazowego silnika reluktancyjnego przełączalnego (SRM) oparty na metodzie sieci reluktancyjnych (MSR). Model pozwala wyznaczyć przebieg indukcyjności własnej uzwojenia fazowego w zależności od kąta położenia wirnika, dla różnych wartości parametrów geometrycznych silnika (m.in. szerokości biegunów stojana i wirnika). Model uwzględnia nieliniowość magnetyczną rdzenia. Artykuł zawiera opis konstrukcji bazowej analizowanego silnika, opis procedury wyznaczania indukcyjności uzwojenia oraz przykładowe wyniki otrzymane przy użyciu modelu. Dla różnych wartości wybranych parametrów geometrycznych pokazano przebiegi kątowe indukcyjności oraz jej pochodnej względem kąta położenia wirnika i porównano je z wynikami obliczeń polowych oraz wynikami otrzymanymi przy użyciu podobnego modelu innego autora. Ponadto pokazano wyniki wstępnej analizy wrażliwości parametrów przebiegu kątowego indukcyjności (zdefiniowanych tak, aby charakteryzowały moment) na zmiany geometrii silnika. Model zostanie wykorzystany do optymalizacji konstrukcji silnika. Model został zaimplementowany w środowisku MATLAB.

EN

A method of determining inductances of a switched reluctance motor (SRM) based on reluctance network analysis has been presented in the paper. The model allows calculating a self inductance function of one phase versus rotor angular position, for a few variable parameters of the geometry (e.g. a width of the rotor and stator poles). The model takes into consideration the magnetic non-linearity of a core. The paper comprises a description of a base construction of the analyzed motor, a procedure of calculating the inductance and results obtained by means of the model. Inductance functions and their derivatives versus rotor angular position for selected variable parameters of the geometry have been presented for the proposed model, an earłier model of another author, and finite element calculations. Moreover, a sensitive analysis has been performed for the inductance function as well as three criterial functions assumed to be used in optimization. The model is designed to optimize of the SRM construction. The model was implemented in the MATLAB environment.

2

Modernizacja linii piecowej nr 1 w Cementowni Górażdże - wymiennik ciepła, piec obrotowy

100%

Majchrowicz M.

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tom R. 8/70, nr 4

182-187

PL

Modernizację cyklonowego wymiennika ciepła i budowę układu dekarbonizacji przeprowadziła firma Technip-Coflexip. Piec obrotowy posiada po modernizacji tę samą średnicę i długość, wymieniono cały płaszcz pieca i zwiększono prędkość obrotową z 2 do maksymalnie 4 obr/min. W pierwszym stopniu wymiennika ciepła wymieniono cyklony, w stopniach drugim, trze- cim i czwartym zwiększono średnice rur centralnych i zmodyfikowano kanały gazów łączące poszczególne stopnie wymiennika. Dekarbonizator RSP MINOX umożliwia maksymalną redukcję emisji tlenków azotu przy spalaniu paliw o niskiej wartości opałowej. Posiada on dwie komory spalania, po jednej w każdej gałęzi cyklonów. Ostateczne reakcje spalania i dekarbonizacji zachodzą, w komorze mieszania i przewodzie „gęsia szyja". Przez zainstalowany bocznik odprowadzanych jest 5-7% gazów powstających w piecu. Do odpylania gazów odlotowych z pieca i nadmiarowych gazów z chłodnika wybrano niskociśnieniowe odpylacze workowe.

EN

The modernization of cyclone preheater and the construction of precalcining system were carried out by Technip-Coflexip. The rotary kiln has after modernization the same diameter and length, but the whole kiln shell has been replaced and rotational speed has been increased from 2 to maximum 4 r.p.m. In the first stage of cyclone preheater cyclones have been replaced, in the second, third and fourth stages diameters of central tubes have been increased and gas passages connecting individual preheater stages have been modified. RSP MINOX calciner enables a maximum reduction of nitrogen oxides emission by combustion of fuels with low calorific value. It has two combustion chambers, one in each cyclone string. Final combustion and decarbonation reactions occur in mixing chamber and "goose neck" pipe. Installed by-pass carries off 5-7% of gases formed in the kiln. For dedusting of exhaust gases from the kiln and excess gases from cooler low-pressure bag filters are chosen.

3

Management of IoT Devices in a Smart Home through the Application of an Interactive Mirror

63%

Majchrowicz M. , Hufnagiel M.

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2017

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tom Vol. 22, no. 4

43--50

EN

Internet of Things (IoT) devices are big part of concept, which is called by electronic producers and many others Smart Home. Authors of this paper have decided to take a look at it and as a result of this analysis propose and implement (in a form of working prototype) a system that could manage different kinds of devices. The main objective of the project presented in the paper is a device that looks like a mirror and it is known to most people also is an interactive center, a place to obtain information of the devices that surround us and various parameters coming from sensors. Authors have prepared a prototype, that will be the central point of the apartment and allow users control over IoT devices.

4

Wybrane aspekty optymalizacji silnika reluktancyjnego przełączalnego (SRM) przeznaczonego do napędu samochodu elektrycznego

63%

Majchrowicz M. , Jażdżyński W.

Maszyny Elektryczne : zeszyty problemowe

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2009

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tom Nr 84

147-150

EN

In the paper an optimization procedure concerning a construction of a 6/4 type SRM has been described. A magnetically linear analytical model derived with the help of a reluctance network method has been employed in this task. The model allows determining all quantities required in a design synthesis program. A sensitivity analysis has been performed for two criterial functions related to an average value of the electromagnetic torque and the rated efficiency, with respect to one of the optimization variables, as well as an assumed value of the rated velocity. An example of optimization concerns a minimization of the amplitude of the pulsating component of the electromagnetic torque. Optimization results are presented and validated by means of a magnetically non-linear FEM model. After some modifications the presented approach can be applied when searching for a best construction of any type SRM, in particular for a drive motor in an electrical vehicle.

5

Wybrane zagadnienia wyznaczania strat w silniku reluktancyjnym przełączalnym

63%

Majchrowicz M. , Jażdżyński W.

Prace Instytutu Elektrotechniki

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2008

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tom Z. 239

5-16

PL

W artykule rozpatrywany jest problem wpływu strumienia ścian bocznych biegunów na otrzymywane przebiegi składowej normalnej indukcji magnetycznej w biegunach silnika reluktancyjnego przełączalnego (ang. Switched Reluctance Motor) typu 6/4, wraz z propozycją jego uproszczonego rozwiązania. Nieuwzględnienie faktu przenikania strumienia przez ściany boczne biegunów prowadzi do zniekształconych przebiegów indukcji w biegunach maszyny i w konsekwencji może prowadzić do niedokładnego wyznaczenia wartości strat magnetycznych. Rozważania są oparte na wynikach otrzymywanych przy pomocy uproszczonego modelu analitycznego silnika SRM, weryfikowanego metodą elementów skończonych (Flux 2D). Artykuł zawiera zarys procedury wyznaczania strat magnetycznych w silniku SRM przy użyciu modelu analitycznego maszyny. Obliczenia z wykorzystaniem modelu uproszczonego przeprowadzono w środowisku MATLAB.

EN

An influence of flux penetrating side walls of poles on a function of the flux density (normal component) in poles and magnetic losses in a 6/4 switched reluctance motor is investigated in the paper. A proposal of a simplified solution of this problem and relevant calculation results are presented. It has been shown that disregarding the fact that the flux penetrates the side walls of poles causes a deformation of the flux density function in the poles and is a reason of overstated values of magnetic losses. Considerations based on results obtained from an analytical model of SRM have been verified by means of finite element calculations (Flux 2D). In the paper an analytical calculation procedure in MATLAB environment, used to determine magnetic losses in the SRM, is proposed.

6

Acceleration of image reconstruction process in the electrical capacitance tomography 3D in heterogeneous, Multi-GPU system

51%

Majchrowicz M. , Kapusta P. , Jackowska-Strumiłło L. , Sankowski D.

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2017

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tom T. 7, nr 1

37--41

EN

Electrical capacitance tomography is an innovative method for visualization of industrial processes. One of its main advantages is it’s high time resolution that allows to the usage of ECT in systems with high volatility. In recent years there has been significant development of electrical capacitance tomography 3D, which however, has significantly reduced industrial it’s applications due to the complicated process of image reconstruction. The authors propose the use of multi-node, multi-GPU system to accelerate the process of image reconstruction in ECT 3D.

PL

Elektryczna tomografia pojemnościowa jest innowacyjną metodą wizualizacji procesów przemysłowych. Jedną z jej głównych zalet jest duża rozdzielczość czasowa pozwalająca na zastosowanie ECT w instalacjach o dużej zmienności. W ostatnich latach nastąpił znaczący rozwój elektrycznej tomografii pojemnościowej 3D, która jednakże ma znacznie ograniczone zastosowanie przemysłowe ze względu na skomplikowany proces rekonstrukcji obrazu. Autorzy artykułu proponują zastosowanie wielowęzłowego systemu Multi-GPU do przyspieszenia procesu rekonstrukcji obrazu w ECT 3D.

7

Optimization of Distributed Multi-Node, Multi-GPU, Heterogeneous System for 3D Image Reconstruction in Electrical Capacitance Tomography

51%

Majchrowicz M. , Kapusta P. , Jackowska-Strumiłło L. , Sankowski D.

Image Processing & Communications

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2016

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tom Vol. 21, no. 3

81--90

EN

Electrical Capacitance Tomography is a non-invasive imaging technique, which allows visualization of the industrial processes interior and can be applied to many branches of the industry. Image reconstruction process, especially in case of 3D images, is a very time consuming task (when using classic processors and algorithms), which in turn leads to an unacceptable waiting time and currently limits the use of 3D Electrical Capacitance Tomography. Reconstruction using deterministic methods requires execution of many basic operations of linear algebra, such as matrix transposition, multiplication, addition and subtraction. In order to reach real-time reconstruction a 3D ECT computational subsystem must be able to transform capacitance data into images in a fraction of a second. By assuming, that many of the computations can be performed in parallel using modern, fast graphics processor and by altering the algorithms, time to achieve high quality image reconstruction will be shortened significantly. The research conducted while analysing ECT algorithms has also shown that, although dynamic development of GPU computational capabilities and its recent application for image reconstruction in ECT has significantly improved calculations time, in modern systems a single GPU is not enough to perform many tasks. Distributed Multi-GPU solutions can reduce reconstruction time to only a fraction of what was possible on pure CPU systems. Nevertheless performed tests clearly illustrate the need for further optimizations of previously developed algorithms.

8

Analysis of Application of Distributed Multi-Node, Multi-GPU Heterogeneous System for Acceleration of Image Reconstruction in Electrical Capacitance Tomography

51%

Majchrowicz M. , Kapusta P. , Jackowska-Strumiłło L. , Sankowski D.

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2015

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tom Vol. 20, no. 3

5--14

EN

3D ECT provides a lot of challenging computational issues that have been reported in the past by many researchers. Image reconstruction using deterministic methods requires execution of many basic operations of linear algebra, such as matrix transposition, multiplication, addition and subtraction. In order to reach real-time reconstruction a 3D ECT computational subsystem has to be able to transform capacitance data into image in fractions of seconds. By assuming, that many of the computations can be performed in parallel using modern, fast graphics processor and by altering the algorithms time to achieve high quality image reconstruction will be shortened significantly. The research conducted while analysing ECT algorithms has also shown that, although dynamic development of GPU computational capabilities and its recent application for image reconstruction in ECT has significantly improved calculations time, in modern systems a single GPU is not enough to perform many tasks. Distributed Multi-GPU solutions can reduce reconstruction time to only a fraction of what was possible on pure CPU systems. Nevertheless performed tests clearly illustrate the need for developing a new distributed platform, which would be able to fully utilize the potential of the hardware. It has to take into account specific nature of computations in Multi-GPU systems.

9

Application of the Layered Model Management System in an interactive map of the university campus

51%

Faustryjak D. , Majchrowicz M. , Jackowska-Strumiłło L.

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2017

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tom Vol. 22, no. 4

51--58

EN

The paper presents a web application for navigation through the university campus, which is based on Global Positioning System GPS and Open Street Map. The application has a multilayer structure and multi-labelling support. The proposed solution ensures better management of visual data more efficient image processing comparing to the other known methods. With the new search system, users can place a lot of information on one layer without losing the legibility of displayed data. All the information that was displayed on the map was grouped and assigned to the appropriate categories.Therefore a map contains a lot of related information that needs to be linked to each other. The system has been divided into modules that ensure the integrity of the displayed things. Presenting so much information at the same time is managed by modules. Their main job is to provide results that is then segregated and grouped. System presented in this paper was applied for Lodz University of Technology.

10

Application of GPU Parallel Computing for Acceleration of Finite Element Method Based 3D Reconstruction Algorithms in Electrical Capacitance Tomography

51%

Kapusta P. , Majchrowicz M. , Sankowski D. , Banasiak R.

Image Processing & Communications

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2012

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tom Vol. 17, no. 4

339--346

EN

With the increasing complexity and scale of industrial processes their visualization is becoming increasingly important. Especially popular are non-invasive methods, which do not interfere directly with the process. One of them is the 3D Electrical Capacitance Tomography. It possesses however a serious flaw - in order to obtain a fast and accurate visualization requires application of computationally intensive algorithms. Especially non-linear reconstruction using Finite Element Method is a multistage, complex numerical task, requiring many linear algebra transformations on very large data sets. Such process, using traditional CPUs can take, depending on the used meshes, up to several hours. Consequently it is necessary to develop new solutions utilizing GPGPU (General Purpose Computations on Graphics Processing Units) techniques to accelerate the reconstruction algorithm. With the developed hybrid parallel computing architecture, based on sparse matrices, it is possible to perform tomographic calculations much faster using GPU and CPU simultaneously, both with Nvidia CUDA and OpenCL.

11

Applying parallel and distributed computing for image reconstruction in 3D electrical capacitance tomography

51%

Kapusta P. , Majchrowicz M. , Banasiak R.

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2010

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tom T. 14, z. 3/2

711-722

EN

The main goal of this article is to describe the set of solutions based on the OpenCL and Xgrid technologies that would accelerate image reconstruction calculation process in 3D Electrical Capacitance Tomography. The authors propose a new idea of performing the image reconstruction process by combining graphic cards and parallel programming techniques using OpenCL technology with distributed computing based on Xgrid clusters.

PL

Głównym celem tego artykułu jest opisanie zbioru rozwiązań opartych na technologiach Xgrid i OpenCL, które mogą przyśpieszyć rekonstrukcję obrazu z wykorzystaniem elektrycznej tomografii pojemnościowej 3D. Autorzy proponują nowy sposób rekonstrukcji obrazu przez połączenie kart graficznych i technik programowania równoległego, wykorzystując OpenCL w połączeniu z rozproszonymi obliczeniami wykonywanymi z pomocą klastrów Xgrida.

12

Analysis of application of distributed multi-node, multi-GPU heterogeneous system for acceleration of image reconstruction in Electrical Capacitance Tomography

51%

Majchrowicz M. , Kapusta P. , Jackowska-Strumiłło L.

Image Processing & Communications

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2013

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tom Vol. 18, no. 2-3

109--117

EN

3D ECT provides a lot of challenging computational issues that have been reported in the past by many researchers. Image reconstruction using deterministic methods requires execution of many basic operations of linear algebra, such as matrix transposition, multiplication, addition and subtraction. In order to reach real-time reconstruction a 3D ECT computational subsystem has to be able to transform capacitance data into image in fractions of seconds. By assuming, that many of the computations can be performed in parallel using modern, fast graphics processor and by altering the algorithms time to achieve high quality image reconstruction will be shortened significantly. The research conducted while analysing ECT algorithms has also shown that, although dynamic development of GPU computational capabilities and its recent application for image reconstruction in ECT has significantly improved calculations time, in modern systems a single GPU is not enough to perform many tasks. Distributed Multi-GPU solutions can reduce reconstruction time to only a fraction of what was possible on pure CPU systems. Nevertheless performed tests clearly illustrate the need for developing a new distributed platform, which would be able to fully utilize the potential of the hardware. It has to take into account specific nature of computations in Multi-GPU systems.

13

Distributed multi-node, multi-GPU, heterogeneous system for 3D image reconstruction in Electrical Capacitance Tomography – network performance and application analysis

45%

Kapusta P. , Majchrowicz M. , Sankowski D. , Jackowska-Strumiłło L. , Banasiak R.

Przegląd Elektrotechniczny

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2013

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tom R. 89, nr 2b

339--342

EN

3D ECT provides a lot of challenging computational issues as image reconstruction requires execution of many basic operations of linear algebra, especially when the solutions are based on Finite Element Method. In order to reach real-time reconstruction a 3D ECT computational subsystem has to be able to transform capacitance data into image in fractions of seconds. By performing computations in parallel and in a distributed, heterogeneous, multi-GPU environment a significant speed-up can be achieved. Nevertheless performed tests clearly illustrate the need for developing a highly optimized distributed platform, which would mitigate existing hardware and software limitations.

PL

3D ECT zapewnia wiele złożonych problemów obliczeniowych, jako, że rekonstrukcja obrazu wymaga wykonania wielu podstawowych operacji algebry liniowej, zwłaszcza, gdy rozwiązania oparte są na Metodzie Elementów Skończonych. W celu osiągnięcia rekonstrukcji w czasie rzeczywistym system obliczeniowy musi być zdolny do przekształcania danych pomiarowych na obraz w ułamkach sekund. Poprzez wykonywanie obliczeń w sposób równoległy, z wykorzystaniem rozproszonego środowiska heterogenicznego multi-GPU można uzyskać znaczne ich przyspieszenie. Niemniej przeprowadzone badania wyraźnie pokazują potrzebę opracowania wysoce zoptymalizowanej, rozproszonej platformy, która pozwoliłaby na ominięcie istniejących ograniczeń sprzętowych i programowych.