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    Wyświetlanie 1-8 z 8
    Tytuł:
    Using a particular sampling method for impedance measurement
    Autorzy:
    Lentka, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/221836.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impedance measurement
    impedance analyzer
    particular sampling
    Opis:
    The paper presents an impedance measurement method using a particular sampling method which is an alternative to DFT calculation. The method uses a sine excitation signal and sampling response signals proportional to current flowing through and voltage across the measured impedance. The object impedance is calculated without using Fourier transform. The method was first evaluated in MATLAB by means of simulation. The method was then practically verified in a constructed simple impedance measurement instrument based on a PSoC (Programmable System on Chip). The obtained calculation simplification recommends the method for implementation in simple portable impedance analyzers destined for operation in the field or embedding in sensors.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 497-508
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A family of new generation miniaturized impedance analyzers for technical object diagnostics
    Autorzy:
    Hoja, J.
    Lentka, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/220894.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technical object diagnostics
    impedance spectroscopy
    impedance analyzer
    Opis:
    The paper presents the family of three analyzers allowing to measure impedance in the range of 10 Ω<|Zx|<10 GΩ in a wide frequency range from 10 mHz up to 100 kHz. The most important features of the analyzer family are: miniaturization, low power consumption, low production cost, telemetric controlling and the use of an impedance measurement method based on digital signal processing (DSP). The miniaturization and other above-mentioned features of the analyzers were obtained thanks to the use of the newest generation of large-scale integration chips: e.g. "system on a chip" microsystems (AD5933), 32-bit AVR32-family microcontrollers and specialized modules for wireless communication using the ZigBee standard. When comparing metrological parameters, the developed instrumentation can equal portable analyzers offered by top worldwide manufacturers (Gamry, Ivium) but outperforms them on smaller dimensions, weight, a few times lower price and the possibility to work in a distributed telemetric network. All analyzer versions are able to be put into medium-volume production.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 43-52
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast high-impedance spectroscopy method using sinc signal excitation
    Autorzy:
    Kowalewski, M.
    Lentka, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/220740.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impedance spectroscopy
    sinc signal
    Fourier transform
    impedance analyzer
    Opis:
    In this paper the method of fast impedance spectroscopy of technical objects with high impedance (|Zx| ≥ 1 GΩ) is evaluated by means of simulation and a practical experiment. The method is based on excitation of an object with a sinc signal and sampling the response signals proportional to current flowing through and voltage across the measured impedance. The object’s impedance spectrum is obtained with the use of continuous Fourier transform on the basis of linear approximations between samples in two acquisition sections, connected with the duration of the sinc signal. The method is first evaluated in MATLAB by means of simulation. An influence of the sinc signal duration and the number of samples on impedance modulus and argument measurement errors is explored. The method is then practically verified in a constructed laboratory impedance spectroscopy measurement system. The obtained acceleration of impedance spectroscopy in the low frequency range (below 1 Hz) and the decrease of the number of acquired samples enable to recommend the worked out method for implementation in portable impedance analyzers destined for operation in the field.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 4; 645-654
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measuring Impedances of DC-biased Inductors by Using Vector Network Analyzers
    Autorzy:
    Asmanis, G.
    Stepins, D.
    Asmanis, A.
    Ribickis, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/226614.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vector network analyzer
    impedance
    inductor
    measurements
    accuracy
    bias tee
    Opis:
    This paper is devoted to a detailed experimentally based analysis of applicability of vector network analyzers for measuring impedance of surface mount inductors with and without DC bias. The measurements are made using custom-made bias tees and a test fixture with an ordinary vector network analyzer. The main attention in the analysis is focused on measurement accuracy of an impedance of surface mount inductors. Measurement results obtained with a vector network analyzer will also be compared to those obtained by using an impedance analyzer based on auto-balancing bridge method.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 3; 375-380
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation and Thermodynamic Analyses of Inclusions in Ti-Containing Steel Weld Metals with Different Al Contents
    Autorzy:
    Wang, Bingxin
    Jiang, Yingtian
    Powiązania:
    https://bibliotekanauki.pl/articles/2049426.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermodynamic calculation
    electron probe micro-analyzer
    oxide inclusion
    aluminium content
    phase diagram
    Opis:
    Ti-containing steel weld metals with Al contents of 0.01-0.085% were prepared. The effects of Al contents on the inclusions evolution were investigated by means of thermodynamic calculations coupled with electron probe micro-analyses and transmission electron microscopy. The results show that the inclusions in the 0.01% Al weld metal are mainly composed of ilmenite withsome amounts of (Mn-Si-Al)-oxide and titanial_spinel. When Al content is increased up to 0.035%, a more amount of corundum and a small amount of pseudobrookite are formed. In 0.085% Al weld metal, the (Mn-Si-Al)-oxide disappears completely, and the inclusions contain a substantial amount of corundum, in addition to a minimal amount of pseudobrookite. Ti3O5, MnTi2O4 and MnTiO3 are the primary constituents of pseudobrookite, titanial_spinel and ilmenite, respectively. Titanial_spinel and ilmenite have higher amounts of Mn, but lower Ti levels compared with pseudobrookite. In the case of presence of a considerable amountsof titanial_spinel and ilmenite, Mn-depleted zone is formed in matrix around the inclusions.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 171-180
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Expansion of ZrO2-20 mol% Gd2O3
    Autorzy:
    Kang, Kweonho
    Hong, Seok-Min
    Lee, Changhwa
    Cho, Yongjun
    Powiązania:
    https://bibliotekanauki.pl/articles/2125531.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ZrO2-20 mol% Gd2O3 pellet
    thermal expansion
    thermal expansion coefficient
    density
    thermo-mechanical analyzer
    Opis:
    The thermal expansion of a ZrO2-20 mol% Gd2O3 pellet has been systematically investigated using a thermo-mechanical analyzer in the temperature range of 293-1773 K. Variations in the thermal expansion coefficient and density upon temperature change were calculated using the thermal expansion data. The average linear thermal expansion coefficient of theZrO2-20 mol% Gd2O3 pellet was found to be 9.522 × 10-6 K-1 in the range of 298-1073 K. This value is smaller than that of ZrO2 and larger than that of Gd2O3. Further, with an increase in temperature to 1773 K, the density of ZrO2-20 mol% Gd2O3 pellet was found to decrease to 94.98 % of the initial density at 293 K.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 909--912
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on Liquid Forming Process of Nickel Superalloys Thin Sheet Metals
    Autorzy:
    Hyrcza-Michalska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355928.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    drawability
    local strain distribution measurements
    forming limit curve
    AutoGrid strain analyzer
    thin sheet metals
    nickel superalloys
    Inconel 625
    Inconel 718
    hydroforming
    Opis:
    The paper presents the study of drawability of thin sheet metals made of a nickel superalloy Inconel type. The manufacturing process of axisymmetric cup – cone and a closed section profile in the form of a circular tube were designed and analyzed. In both cases, working fluid-oil was used in place of the rigid tools. The process of forming liquid is currently the only alternative method for obtaining complex shapes, coatings, and especially if we do it with high-strength materials. In the case of nickel superalloys the search for efficient methods to manufacture of the shaped shell is one of the most considerable problems in aircraft industry [1-5]. However, the automotive industries have the same problem with so-called advanced high-strength steels (AHSS). Due to this, both industrial problems have been examined and the emphasis have been put on the process of liquid forming (hydroforming). The study includes physical tests and the corresponding numerical simulations performed, using the software Eta/Dynaform 5.9. Numerical analysis of the qualitative and quantitative forecasting enables the formability of materials with complex and unusual characteristics of the mechanical properties and forming technology. It has been found that only the computer aided design based on physical and numerical modeling, makes efficient plastic processing possible using a method of hydroforming. Drawability evaluation based on the determination of the mechanical properties of complex characteristics is an indispensable element of this design in the best practice of industrial manufacturing products made of thin sheet metals.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2355-2358
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drawability Studies of Magnesium Alloy Sheets at Elevated Temperature
    Badania tłoczności blach ze stopów magnezu w podwyższonej temperaturze
    Autorzy:
    Hyrcza-Michalska, M.
    Kawalla, R.
    Dembińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/354262.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    drawability at elevated temperature
    local strain distribution measurements
    forming limit curve
    AutoGrid strain analyzer
    thin sheet metal
    magnesium alloys
    AZ31
    cup forming test
    rozciągliwość w podwyższonej temperaturze
    pomiar rozkładu naprężeń lokalnych
    krzywe graniczne
    cyfrowy analizator odkształceń lokalnych AutoGrid
    blachy cienkie
    magnez
    tłoczność blach
    Opis:
    The paper presents the results of a study of drawability of thin AZ31 magnesium alloy metal sheets. These studies are a continuation of experiences in presenting the characteristics of technological plasticity of strips made of magnesium alloy which have been cast between rolls in vertical and horizontal systems called ‘twin-roll casting’. In the context of previous experiments conducted at the Institute of Material Technology of the Silesian University of Technology in cooperation with the Technical University - Bergakademie Freiberg (Germany), drawability of these strips at elevated temperatures has been comprehensively defined while using forming limit curves. Due to low formability of magnesium alloys at ambient temperature, formability tests - including cup forming tests presented in this paper - have been carried out in heated dies at temperature range of 200°C to 350°C. A modern AutoGrid digital local strain analyzer has been used in the examinations and the method of image analysis of deformed coordination nets has been applied. Quantitative and qualitative impact of deformation temperature upon the drawability effects of AZ31 magnesium alloys products have been evaluated.
    W pracy przedstawiono rezultaty badań tłoczności blach cienkich ze stopu magnezu AZ31. Badania te są kontynuacją doświadczeń w zakresie sporządzania charakterystyk technologicznej plastyczności blach taśmowych ze stopów magnezu odlewanych między walcami w układach pionowych i poziomych, tzw. metodą „twin roll casting”. W ramach wcześniejszych doświadczeń prowadzonych w I nstytucie Technologii Metali Politechniki Śląskiej i we współpracy z Technical University – Bergakademie Freiberg (Germany), przy zastosowaniu granicznych krzywych tłoczenia określono kompleksowo tłoczność tych blach w podwyższonej temperaturze. Z uwagi na niską odkształcalność magnezu w temperaturze otoczenia próby tłoczności, w tym prezentowaną w niniejszym opracowaniu próbę miseczkowania, wykonano w podgrzewanych matrycach w zakresie 200°C do 350°C. W badaniach wykorzystano nowoczesny, cyfrowy analizator odkształceń lokalnych AutoGrid oraz metodę analizy obrazu odkształconych siatek podziałowych. Oceniono ilościowy i jakościowy wpływ temperatury odkształcenia na efekty tłoczenia wyrobów ze stopu magnezu AZ31.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2751-2756
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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