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    Wyświetlanie 1-7 z 7
    Tytuł:
    Consideration of the spatial orientation of magnetic field quantities and tensile mechanical stress in the Finite Element Analysis of electrical machines
    Autorzy:
    Schauerte, Benedict
    Xiao, Xiao
    Jansen, Kevin
    Hameyer, Kay
    Powiązania:
    https://bibliotekanauki.pl/articles/2172800.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnetic measurements
    magneto-mechanical coupling
    vector hysteresis
    non-oriented electrical steel
    Villari effect
    Opis:
    Due to speed-dependent centrifugal forces, the support of the torque, static mechanical stress introduced by manufacturing processes the laminated core of rotating electrical machines is exposed to considerable mechanical stress. The resulting stress distribution changes the magnetic properties of the electrical steel. To take this into account, a magnetization model is constituted on the basis of vector magneto-mechanical measurements that include the magnetic permeability as a function of the mechanical stress and the angle between magnetization - and the maximum principal stress direction. Subsequently, the model is integrated into the finite element simulation of a permanent magnet excited synchronous machine at different rotational speeds.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 4; 949--961
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical identification of Preisach distribution function including temperature effects
    Autorzy:
    Chelghoum, Leila
    Powiązania:
    https://bibliotekanauki.pl/articles/2086685.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnetic hysteresis
    Preisach distribution function
    Preisach model
    soft ferromagnetic materials
    temperature effect
    Opis:
    Magnetic hysteresis occurs in most electrical engineering devices once soft ferromagnetic materials are exposed to relatively high temperatures. According to several scientific studies, magnetic properties are strongly influenced by temperature. The development of models that can accurately describe the thermal effect on ferromagnetic materials is still an issue that inspires researchers. In this paper, the effect of temperature on magnetic hysteresis for ferromagnetic materials is investigated using a self-developed numerical method based on the Preisach distribution function identification. It employs a parameter depending on both temperature and the Curie temperature. This approach is of the macroscopic phenomenological type, where the variation of the magnetization (in direct connection with the Preisach triangle) is related to the observed macroscopic hysteretic behavior. The isotropic character of the material medium is predominant. The technique relies on a few experimental data extracted from the first magnetization curve provided by metallurgists. The ultimate goal is to provide a simple and robust magnetic behavior modeling tool for designers of electrical devices. Temperature is introduced at the stage of identifying the distribution function of the Preisach model. This method is validated by the agreement between the experimental data and the simulation results. The developed method is very accurate and efficient in modeling the hysteresis of ferromagnetic materials in engineering particularly for systems with ferromagnetic components and electromagnetic-thermal coupling.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 2; 297--309
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient approach for iron loss separation of non-grain-oriented electrical steels considering the impact of cut edge effect
    Autorzy:
    Mülder, Christoph
    Elfgen, Silas
    Hameyer, Kay
    Powiązania:
    https://bibliotekanauki.pl/articles/140851.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cut edge effect
    hysteresis losses
    iron losses
    transient loss model
    Opis:
    The purpose of this paper is to focus on the loss separation of non-grain-oriented electrical steels used for speed-variable rotating electrical machines. The impact of laser-cutting, used in prototype manufacturing and of flux density harmonics, occurring locally in the lamination, on the loss distribution is studied in detail. Iron losses occurring under operation can physically be separated in different loss components. In this paper, a frequency-based loss model with parameters identified for single-sheet tester specimens, cut in strips of different widths, is therefore used. Moreover, a time-domain approach considers loss distributions occurring from higher harmonics. Hysteresis losses having high sensitivity to cut edge effects are calculated by the well-known Jiles-Atherton model adapting the frequency-based loss parameters. The model is validated by free-curve measurements at a single-sheet tester. It has been shown that the studied elliptical hysteresis model becomes inaccurate particularly for specimens with small strip widths with similar dimensions as teeth of electrical machine laminations. The incorrect mapping of losses occurring from minor hysteresis loops due to higher harmonics is concluded. The results showconsequently that both, the impact of a cut edge effect and local distributions of flux density harmonics need to be considered in terms of accurate iron loss prediction of electrical machine design.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 2; 237-244
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Value added of intellectual capital in banks and the hysteresis effect
    Autorzy:
    Smuda-Kocoń, Marlena
    Powiązania:
    https://bibliotekanauki.pl/articles/325937.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    value added
    hysteresis effect
    intellectual capital
    wartość dodana
    efekt histerezy
    kapitał intelektualny
    Opis:
    The aim of this paper is to contribute to the identification, illustration and description of patterns in the Value Added Intellectual Capital for banks in the long term. The study is part of the discussion on contemporary measures of organisational success and sources of value creation. Based on the subject literature, it is hypothesised that intellectual capital creates added value with some delay due to the operation of various external stimuli (e.g. financial market turbulence, economic slowdown), which may be explained in a logically coherent way using the hysteresis effect. The analysis covers empirical material obtained during broader research on a sample of banks listed on the Warsaw Stock Exchange in the years 2007-2017. As results of the study show, over the last decade, banks have evidently recorded the creation of added value in connection with the held intellectual capital resources. Its growth should, however, be interpreted with a large degree of caution. The occurrence of turbulence on the financial markets in the years 2007-2009 was not without impact on the results obtained.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2019, 136; 551-563
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Magnetic Properties of Pt/Co/Pt Films by $Ga^{+}$ Ion Irradiation: Focused versus Uniform Irradiation
    Autorzy:
    Sveklo, I.
    Mazalski, P.
    Jaworowicz, J.
    Jamet, J.
    Vernier, N.
    Mougin, A.
    Ferré, J.
    Kisielewski, M.
    Zablotskii, V.
    Bourhis, E.
    Gierak, J.
    Postava, K.
    Fassbender, J.
    Kanak, J.
    Maziewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398198.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    ultrathin films
    ion irradiation
    magnetic hysteresis
    magnetic anisotropy
    magneto-optic Kerr effect
    Opis:
    30 keV $Ga^{+}$ irradiation-induced changes of magnetic and magneto-optical properties of sputtered Pt/Co/Pt ultrathin trilayers films have been studied as a function of the ion fluence. Out-of-plane magnetic anisotropy states with enhanced magneto-optical effects were evidenced for specific values of cobalt thickness and irradiation fluence. Results obtained after uniform or quasi-uniform focused ion beam irradiation on either out-of-plane or in-plane magnetized sputtered pristine trilayers are compared. Similar irradiation-induced magnetic changes are evidenced in quasi-uniformly focused ion beam or uniformly irradiated films, grown either by sputtering or molecular beam epitaxy. We discuss on plausible common mechanisms underlying the observed effects.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1215-1226
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ZRÓŻNICOWANIE WSPÓŁCZYNNIKA OKUNA ZE WZGLĘDU NA WIEK I PŁEĆ BEZROBOTNYCH - ANALIZA PANELOWA DLA KRAJÓW UNII EUROPEJSKIEJ
    DIFFERENTIATION OF OKUNS LAW COEFFICIENT ACCORDING TO THE AGE AND SEX OF THE UNEMPLOYED - PANEL ANALYSIS OF THE COUNTRIES IN THE EUROPEAN UNION
    Autorzy:
    Misiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/453259.pdf
    Data publikacji:
    2015
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
    Tematy:
    różnicowa wersja prawa Okuna
    struktura bezrobotnych
    efekt histerezy stóp bezrobocia
    model SUR
    Okun's law “difference version”
    the structure of unemployment
    a hysteresis effect of unemployment rates
    SUR model
    Opis:
    W opracowaniu dokonano oszacowań współczynników prawa Okuna w wersji różnicowej dla danych panelowych obejmujących kraje Unii Europejskiej w latach 1998-2014, uwzględniając strukturę bezrobotnych ze względu na wiek oraz płeć. Autor przedstawia teoretyczny model zależności rozszerzając różnicową wersję prawa Okuna o efekt histerezy stóp bezrobocia, który poddał empirycznej weryfikacji bazując na danych panelowych dla krajów UE, które zostały podzielone na dwie grupy UE15 oraz UE13. Taki podział na grupy wynika z chęci zaobserwowania wpływu stopy wzrostu gospodarczego na przyrost stopy bezrobocia różnych grup bezrobotnych (ze względu na wiek oraz płeć) w krajach „starej” oraz „nowej” UE. Analizy empiryczne prowadzone były w oparciu o dwa warianty estymowanych zależności: równanie różnicowej wersji prawa Okuna oraz zaproponowane równanie prawa Okuna w wersji różnicowej z uwzględnieniem efektu histerezy stóp bezrobocia w poszczególnych grupach. W estymacjach wykorzystano model SUR (Seemingly unrelated regression), który dopuszcza skorelowanie składników losowych pochodzących z różnych przekrojów (contemporaneous correlation), co w przypadku rynku pracy w UE wydaje się być uzasadnione. Uwzględniając zaś efekt histerezy stóp bezrobocia skorzystano z zerojedynkowych zmiennych przełącznikowych . Wprowadzenie zmiennych przełącznikowych wynika stąd, iż pełnią one rolę zmiennej korygującej oddziaływanie stopy bezrobocia z poprzedniego okresu na przyrost bieżącej stopy bezrobocia i zależą od tego czy stopa ta rosła czy malała.
    In this study, the estimations of coefficients of Okun's law in “difference version” were made for the panel data covering the countries from the European Union and including the structure of the unemployment according to the age and the sex. The author presents a theoretical model based on Okun's law but additionally broadens the “difference version” of Okun's law by the hysteresis effect of unemployment rates, which was a subject for empirical verification based on panel data for EU countries for the years 1998-2014, which were divided into two groups EU15 and the EU13. This division into groups resulted from a desire to observe the impact of the economic growth rate on an increase in unemployment of different social groups (according to the age and sex) in the „old” and „new” EU. The empirical analyses were conducted upon the basis of two variants of estimated dependences: the equation of “difference version” of Okun's law and the proposed equation of Okun's law in “different version” taking into account the effect of hysteresis in unemployment rates between analyzed groups. In the estimations the SUR (seemingly unrelated regression) method was used what allows for calculating contemporaneous correlation of components from different sections, which in the case of the EU labor market seems to be justified. When taking into account the effect of hysteresis in unemployment rates the dummy variables were used. Such approach is an effect of assumption that the dummy variables act as variables correcting the impact of the unemployment rate from the previous period on the increase in the current rate of unemployment and they depend on whether the rate has increased or decreased.
    Źródło:
    Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 4; 34-43
    2082-792X
    Pojawia się w:
    Metody Ilościowe w Badaniach Ekonomicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of hysteretic live load effect in a soil-steel bridge
    Autorzy:
    Sobótka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178773.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    soil-steel structure
    flexible steel culverts
    live load effect
    hysteresis
    obciążenie o zmiennym położeniu
    histereza
    podatny przepust stalowy
    Opis:
    The paper presents numerical simulation of hysteretic live load effect in a soil-steel bridge. The effect was originally identified experimentally by Machelski [1], [2]. The truck was crossing the bridge one way and the other in the full-scale test performed. At the same time, displacements and stress in the shell were measured. The major conclusion from the research was that the measured quantities formed hysteretic loops. A numerical simulation of that effect is addressed in the present work. The analysis was performed using Flac finite difference code. The methodology of solving the mechanical problems implemented in Flac enables us to solve the problem concerning a sequence of load and non-linear mechanical behaviour of the structure. The numerical model incorporates linear elastic constitutive relations for the soil backfill, for the steel shell and the sheet piles, being a flexible substructure for the shell. Contact zone between the shell and the soil backfill is assumed to reflect elastic-plastic constitutive model. Maximum shear stress in contact zone is limited by the Coulomb condition. The plastic flow rule is described by dilation angle ψ = 0. The obtained results of numerical analysis are in fair agreement with the experimental evidence. The primary finding from the performed simulation is that the slip in the interface can be considered an explanation of the hysteresis occurrence in the charts of displacement and stress in the shell.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 1; 103-109
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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