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    Wyświetlanie 1-6 z 6
    Tytuł:
    Calibration of reference torque transducer in one direction and use of its cubic coefficients in both directions with improved interpolation error
    Autorzy:
    Khaled, K. M.
    Osman, Seif M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173893.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    torque
    calibration
    fitting function
    clockwise
    counterclockwise
    Opis:
    The current research work presents an investigation into use of the fitting coefficients resulting from the cubic curve fitting of the torque transducer calibration results in one direction to calculate the actual torque in the other torque direction with two methods: one is direct substitution with the nominal torque which gives a propagated linear relative interpolation error and the other is changing the sign of the second coefficient in the cubic function when using in the other torque direction. This proposed modification improves the absolute relative interpolation error by 5 to 16 times in the clockwise and counterclockwise directions based on the torque transducer’s classification.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 3; 539--551
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CorrFit - a program to fit arbitrary two-particle correlation functions
    Autorzy:
    Kisiel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147430.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    correlation function fitting
    weight method
    Opis:
    Two-particle correlation functions produced in heavy-ion collisions with small relative velocities provide unique space-time information about the system. In order to extract this information, a fitting procedure must be applied. In this work we describe the software main purpose of which is to provide a way to fit arbitrary two-particle correlation functions, using a complete knowledge of the CorrFit corresponding interaction.
    Źródło:
    Nukleonika; 2004, 49,suppl.2; 81-83
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mimicking speaker’s lip movement on a 3D head model using cosine function fitting
    Autorzy:
    Lüsi, I.
    Anbarjafari, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/199798.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    3D lip movement modelling
    mathematical modelling
    depth information analysis
    cosine function fitting
    human-computer interaction
    modelowanie ruchu warg 3D
    modelowanie matematyczne
    funkcja cosinus
    interakcja człowiek-komputer
    Opis:
    Real-time mimicking of human facial movement on a 3D head model is a challenge which has attracted attention of many researchers. In this research work we propose a new method for enhancing the capturing of the shape of lips. We present an automatic lip movement tracking method which employs a cosine function to interpolate between extracted lip features in order to make the detection more accurate. In order to test the proposed method, mimicking lip movements of a speaker on a 3D head model is studied. Microsoft Kinect II is used in order to capture videos and both RGB and depth information are used to locate the mouth of a speaker followed by fitting a cosine function in order to track the changes of the features extracted from the lips.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 733-739
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Curve fitting problem: torque–velocity relationship with polynomials and Boltzmann sigmoid functions
    Autorzy:
    Milanov, P.
    Koroleova, G.
    Mavrevski, R.
    Pencheva, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/307013.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    prędkość
    staw łokciowy
    wielomiany
    funkcja Boltzmanna
    torque–velocity relationship
    elbow flexors
    extensors
    Boltzmann sigmoid
    polynomials
    fitting function
    model selection criteria
    Opis:
    The aim of this study was to investigate the curve fitting and model selection problem of the torque–velocity relationship of elbow flexors and extensors in untrained females. The second goal was to determine the optimal models in different function classes and the best, among the optimal ones. Lastly, test the best models to predict the torque were tested. Methods: Using the polynomials (second – fourth degree) and Boltzmann sigmoid functions, and a different presentation of data points (averages, a point cloud, etc.), we determined the optimal models by both error criteria: minimum residual sum of squares and minimum of the maximal absolute residue. To assess the best models, we applied Akaike and Bayesian information criteria, Hausdorff distance and the minimum of the smallest maximal absolute residue and the predictive torque–velocity relationships of the best models with torque values, calculated beyond the experimental velocity interval. Results: The application of different error and model selection criteria showed that the best models in the majority of cases were polynomials of fourth degree, with some exceptions from second and third degree. The criteria values for the optimal Boltzmann sigmoids were very close to those of the best polynomial models. However, the predicted torque–velocity relationships had physiological behavior only in Boltzmann’s sigmoid functions, and their parameters had a clear interpretation. Conclusion: The results obtained suggest that the Boltzmann sigmoid functions are suitable for modeling and predicting of the torque–velocity relationship of elbow flexors and extensors in untrained females, as compared to polynomials, and their curves are physiologically relevant.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 1; 169-184
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wyznaczanie modeli wielomianowych obiektów z danych eksperymentalnych
    Determination of polynomial models from experimental data
    Autorzy:
    Muciek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/156158.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    dopasowanie funkcji do danych
    wyznaczanie modeli
    wyznaczanie stopnia wielomianu
    fitting data to function
    polynomial degree determination
    model determination: forward selection and backward elimination
    Opis:
    Przedstawiono metody wyznaczania modeli wielomianowych z danych eksperymentalnych. Zaproponowano algorytm pozwalający na uproszczenie obliczeń i zmniejszenie błędów numerycznych. Opracowano program komputerowy i przeprowadzono badania porównawcze metod przy wykorzystaniu zarówno symulowanych wyników eksperymentu jak i wyników pomiarów rzeczywistych obiektów. Analiza pozwoliła na określenie własności metod.
    Methods for polynomial models determination from experimental data are presented. An algorithm that simplifies calculations and decreases numerical errors is proposed. A computer program realizing this method has been prepared and analysis of the method is perfored. Properties of the methods and scope of applications are discussed.
    Źródło:
    Pomiary Automatyka Kontrola; 2007, R. 53, nr 9 bis, 9 bis; 198-201
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust estimation based nonlinear higher order sliding mode control strategies for PMSG-WECS
    Autorzy:
    Nazir, Awais
    Khan, Safdar Abbas
    Khan, Malak Adnan
    Alam, Zaheer
    Khan, Imran
    Irfan, Muhammad
    Rehman, Saifur
    Nowakowski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/27311430.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    wind energy conversion systems
    WECS
    robust control
    maximum power point tracking
    MPPT
    sliding mode control
    SMC
    super-twisting algorithm
    STA
    high gain observer
    artificial neural network
    ANN
    function fitting
    backstepping
    śledzenie maksymalnego punktu mocy
    obserwator o dużym wzmocnieniu
    sztuczna sieć neuronowa
    dopasowanie funkcji
    system konwersji energii wiatrowej
    sterowanie odporne
    sterowanie ślizgowe
    algorytm super skręcania
    Opis:
    The wind energy conversion systems (WECS) suffer from an intermittent nature of source (wind) and the resulting disparity between power generation and electricity demand. Thus, WECS are required to be operated at maximum power point (MPP). This research paper addresses a sophisticated MPP tracking (MPPT) strategy to ensure optimum (maximum) power out of the WECS despite environmental (wind) variations. This study considers a WECS (fixed pitch, 3KW, variable speed) coupled with a permanent magnet synchronous generator (PMSG) and proposes three sliding mode control (SMC) based MPPT schemes, a conventional first order SMC (FOSMC), an integral back-stepping-based SMC (IBSMC) and a super-twisting reachability-based SMC, for maximizing the power output. However, the efficacy of MPPT/control schemes rely on availability of system parameters especially, uncertain/nonlinear dynamics and aerodynamic terms, which are not commonly accessible in practice. As a remedy, an off-line artificial function-fitting neural network (ANN) based on Levenberg-Marquardt algorithm is employed to enhance the performance and robustness of MPPT/control scheme by effectively imitating the uncertain/nonlinear drift terms in the control input pathways. Furthermore, the speed and missing derivative of a generator shaft are determined using a high-gain observer (HGO). Finally, a comparison is made among the stated strategies subjected to stochastic and deterministic wind speed profiles. Extensive MATLAB/Simulink simulations assess the effectiveness of the suggested approaches.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e147063
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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