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    Wyświetlanie 1-8 z 8
    Tytuł:
    Aproksymacja sygnału przejściowego prędkości obrotowej z użyciem funkcji wzorca
    Approximation of transient signal of rotational speed using function of standard
    Autorzy:
    Proch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/327974.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    model matematyczny
    sygnał
    sygnał nieokresowy
    aproksymacja
    silnik elektryczny
    prędkość obrotowa
    electric motor
    rotational speed
    signal
    approximation
    Opis:
    W pracy podano model matematyczny sygnały przejściowego prędkości obrotowej silnika elektrycznego. Przeprowadzono analizę sygnału wyznaczając parametry procesu przejściowego: czasy opóźnienia i narastania oraz wartości: początkową i ustaloną przebiegu.
    In the paper there was presended the mathemetical model of the transient signal of rotational speed of e electric motor. The analysis of the signal was done derermining the parameters of the trasient process: delay and accretion times and initial and inical and fixed.
    Źródło:
    Diagnostyka; 2001, 25; 44-48
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On a Robust Descriptor of the Flue Organ Pipe Transient
    Autorzy:
    Hruška, Viktor
    Dlask, Pavel
    Powiązania:
    https://bibliotekanauki.pl/articles/177377.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    flue organ pipes
    transient signal
    Prony’s method
    Strouhal number
    Opis:
    The initial transient of an organ pipe is known to be of great influence to the perceived sound quality. At the same time, the unsteady process of the tone onset is essentially nonlinear and lacks exact repeatability, so the search for a robust descriptor is in place. Initial transients were recorded using an adjustable flue organ pipe. The blowing pressure and cut-up height were varied. Prony’s method was employed to analyze the results. Utilizing the Principal Component Analysis (PCA) on the standardized exponential model coefficients, it was shown that the transients are well described by just one scalar parameter. Its value is predominantly dependent on the number of important Prony’s components taking part in the transient process (i.e., the overall complexity of the transient signal). A strong correlation was found between the PCA component and the Strouhal number inverse.
    Źródło:
    Archives of Acoustics; 2020, 45, 3; 377-384
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calibration of a mixed-signal power network transient stability analysis emulator
    Autorzy:
    Lanz, G
    Fabre, L.
    Lilis, G
    Kyriakidis, T
    Sallin, D
    Cherkaoui, R.
    Kayal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/398094.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    analog computer
    calibration
    field programmable gate array (FPGA)
    FPGA
    mixed signal
    power system dynamics
    komputer analogowy
    kalibracja
    field-programmable gate array
    sygnał mieszany
    dynamika systemu elektroenergetycznego
    Opis:
    The emerging field of power system emulation for real time smart grid management is very demanding in terms of speed and accuracy. This paper provides detailed information about the electronics calibration process of a high-speed power network emulator dedicated to the transient stability analysis of power systems. This emulator uses mixed-signal hardware to model the dynamic behavior of a power network. Special design allows the self-calibration of the analog electronics through successive measurements and correction steps. The calibration operation guarantees high resolution of the transient stability analysis results, so that they can be reliably used for operational planning and control on real power networks.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2013, 4, 4; 142-147
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of a ring coupled double-Duffing oscillator to a scheme for identifying the coulter signal with a low SNR
    Autorzy:
    Zhao, Zhijie
    Liu, Runcong
    Wang, Xiaodong
    Powiązania:
    https://bibliotekanauki.pl/articles/2200898.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    simulated Coulter signal
    pulsed signal identification
    ring coupled double-Duffing oscillator
    chaotic-transient synchronous mutation
    continuous synchronous mutation
    Opis:
    In order to use chaotic oscillators to identify Coulter signals with a low SNR (SNR⩽0), a Gaussian pulse signal is used to simulate the Coulter signal, and we study the continuous synchronous mutation (CSM) phenomenon of a chaotic ring coupled double-Duffing (RCDD) oscillator to identify the signals. The maximum difference between the two state variables in the oscillator can be used to determine the anti-noise ability of the oscillator and construct a function to identify pulse amplitudes. A Simulink model is constructed to verify that the proposed method can be used to identify pulse amplitudes with a low SNR, which provides an approach for developing a technology of measuring Coulter signals with the low SNR.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 379--393
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Wavelet Analysis of the Vibroacoustic Signal Measurement in a Transient State Operation of Power Transformer
    Autorzy:
    Borucki, S.
    Cichon, A.
    Boczar, T.
    Zmarzly, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417934.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.40.-r
    43.40.Vn
    43.58.Wc
    Opis:
    The article presents the results of attempts made to develop a non-invasive diagnostic method of a technical state of a transformer's core based on an analysis of mechanical vibrations registered during the start-up of the transformer analyzed. The paper presents a characteristic of the transformer under study, the measuring systems applied and the method developed for assessing the degree of the core loosening. The original results presented in the paper have been obtained under laboratory conditions during tests conducted on an oil transformer of 200 kVA. The analysis of recorded virboacoustic signals was performed by means of discrete wavelet transform for three different operating cases: the transformer with no core defect, the transformer with loose screws of the magnetic circuit of the upper yoke, and the transformer with completely loosen screws of the beam of the upper yoke and the lower core. The signals have been recorded on two perpendicular measuring axes: 0X and 0Y and their measured values were subject to the wavelet analysis.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 800-803
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical synthesis of parameter-varying filter of constant component with application to switching systems
    Autorzy:
    Piskorowski, J.
    Kaszyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/221736.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    data acquisition
    analog signal processing
    transient behavior
    dynamics
    switching systems
    linear parameter-varying technique (LPV)
    linear time-varying systems (LTV)
    Opis:
    In this paper, we propose a concept of a continuous-time filter of constant component that exhibits a very short response in the time domain if compared to the traditional time-invariant filter. The improvement of the filter dynamics was achieved as a result of the time-varying parameters which were introduced to the filter structure. Such a designed filter is then applied in a system which switches many distorted signals which should be filtered as fast as possible. The paper is of review nature and presents both a theoretical background of the proposed filter and the results of simulations.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 3; 471-480
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital finite impulse response notch filter with non-zero initial conditions, based on an infinite impulse response prototype filter
    Autorzy:
    Kocoń, S.
    Piskorowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221133.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    measurement
    signal processing
    finite impulse response (FIR) filter
    non-zero initial conditions
    transient response
    electrocardiography
    Opis:
    In this paper a concept of finite impulse response (FIR) narrow band-stop (notch) filter with non-zero initial conditions, based on infinite impulse response (IIR) prototype filter, is proposed. The filter described in this paper is used to suppress power line noise from ECG signals. In order to reduce the transient response of the proposed FIR notch filter, optimal initial conditions for the filter have been determined. The algorithm for finding the length of the initial conditions vector is presented. The proposed values of the length of initial conditions vector, for several ECG signals and interfering frequencies, are calculated. The proposed filters are tested using various ECG signals. Computer simulations demonstrate that the proposed FIR filters outperform traditional FIR filters with initial conditions set to zero.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 4; 767-776
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variable-structure repetitive control for discrete-time linear systems with multiple-period exogenous signals
    Autorzy:
    Kurniawan, Edi
    Harno, Hendra G.
    Wijonarko, Sensus
    Widiyatmoko, Bambang
    Bayuwati, Dwi
    Purwowibowo, Purwowibowo
    Maftukhah, Tatik
    Powiązania:
    https://bibliotekanauki.pl/articles/330684.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    repetitive control
    variable structure control
    multiple period signal
    fast transient response
    sterowanie powtarzalne
    sterowanie o zmiennej strukturze
    odpowiedź przejściowa
    Opis:
    A new method to construct a discrete-time variable-structure repetitive controller for a class of linear systems perturbed by multiple-period exogenous signals is presented. The proposed control scheme combines the features of the discrete-time multiple-period repetitive control (MP-RC) and variable-structure control (VSC) techniques. The MP-RC part is assigned to simultaneously track and reject periodic signals consisting of multiple uncorrelated fundamental frequencies. The VSC part is then integrated to provide a fast transient response and robustness against plant parameter variations. Stability and robustness analyses are also elaborated to ensure that the resulting closed-loop system satisfies the desired control objectives. Moreover, it is shown through an example that the repetitive control system constructed using the proposed control method can effectively track a sinusoidal reference signal despite the presence of a multiple-period disturbance.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2020, 30, 2; 207-218
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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