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    Wyświetlanie 1-6 z 6
    Tytuł:
    Definition of dynamic characteristics of pointer measuring devices on the basis of automatic indications determination
    Autorzy:
    Kucheruk, V.
    Kurytnik, I.
    Kulakov, P.
    Lishchuk, R.
    Moskvichova, Y.
    Kulakova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/949819.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pointer measuring devices
    binarization
    skeletonization
    recognition
    dynamic characteristics
    Opis:
    The article presents the method and algorithm of automatic pointer measuring devices (voltmeter, manometer, metronomes etc.) indications determination in order to determine their dynamic characteristics with the help of web-camera and personal computer. The results of testing and experimental research of developed tool for determining the dynamic characteristics of pointer measuring devices are given. Using this method, the algorithm and the software developed, the process of determining the dynamic characteristics of the pointer measuring devices was automated. The time of recognition and calculation of one measured value for a dual-core processor and webcam with a resolution of 0.3 Mp averages 250–330 ms.
    Źródło:
    Archives of Control Sciences; 2018, 28, 3; 401-418
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of synthesis methods in position optimisation and selection of tuned mass damper (TMD) parameters for systems with many degrees of freedom
    Autorzy:
    Dymarek, Andrzej
    Dzitowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1409049.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    structural control system
    vibration
    simple fractions
    synthesis
    rational functions
    dynamic characteristics
    Opis:
    The paper formulates and formalises a method for selecting parameters of the tuned mass damper (TMD) for primary systems with many degrees of freedom. The method presented uses the properties of positive rational functions, in particular their decomposition, into simple fractions and continued fractions, which is used in the mixed method of synthesis of vibrating mechanical systems. In order to formulate a method of tuning a TMD, the paper discusses the basic properties of positive rational functions. The main assumptions of the mixed synthesis method is presented, based on which the general method of determining TMD parameters in the case of systems with many degrees of freedom was formulated. It has been shown that a tuned mass damper suppresses the desired resonance zone regardless of where the excitation force is applied. The advantages of the formulated method include the fact of reducing several forms of the object’s free vibration by attaching an additional system with the number of degrees of freedom corresponding to the number of resonant frequencies reduced. In addition, the tuned mass damper determined in the case of excitation force applied at a single point can be attached to any element of the inertial primary system without affecting the reduction conditions in this way. It results directly from the methodology formalised in the paper. As part of the paper, numerical calculations were performed regarding the tuning of the TMD to the first form of free vibration of a system with 3 degrees of freedom. The parameters determined were subjected to analysis and verification of the correctness of the calculations carried out. For the considered case of a system with 3 degrees of freedom together with a TMD, time responses of displacement, from each floor, were generated to excitation induced by a harmonic force equal to the first form of vibration of the basic system. In addition, in the case of the parameters obtained, the response of the inertial element system to which the TMD was attached to random white noise excitation was determined.
    Źródło:
    Archives of Control Sciences; 2021, 31, 1; 185-211
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic characteristics of the proton exchange membrane fuel cell module
    Autorzy:
    Cieśliński, J. T.
    Kaczmarczyk, T. Z.
    Dawidowicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/240068.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PEM fuel cell
    hydrogen
    dynamic characteristics
    ogniwo paliwowe PEM
    wodór
    charakterystyka dynamiczna
    Opis:
    The paper describes a fuel cell based system and its performance. The system is based on two fuel cell units, DC/DC converter, DC/AC inverter, microprocessor control unit, load unit, bottled hydrogen supply system and a set of measurement instruments. In the study presented in the paper a dynamic response of the proton exchange membrane (PEM) fuel cell system to unit step change load as well as to periodical load changing cycles in the form of semi-sinusoidal and trapezoidal signals was investigated. The load was provided with the aid of an in-house-developed electronic load unit, which was fully PC controlled. The apparatus was commissioned by testing the steady-state operation of the module. The obtained efficiency of the fuel cell shows that the test apparatus used in the study provides data in substantial agreement with the manufacturer’s data.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 4; 125--140
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic characteristics of underframe semi-active inerter-based suspended device for high-speed train based on LQR control
    Autorzy:
    Wang, Yong
    Li, Hao-Xuan
    Meng, Hao-Dong
    Wang, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/2173695.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic characteristics
    high-speed train
    inerter-based suspended device
    LQR control
    Sperling index
    charakterystyka dynamiczna
    pociąg dużych prędkości
    aktywne zawieszenie na bazie inertera
    kontrola LQR
    indeks Sperlinga
    Opis:
    The underframe passive inerter-based suspended device, based on the inerter-spring-damper vibration attenuation structure, could improve the dynamic performance of the train body, but its parameters are fixed and cannot meet the dynamic performance requirements under different operating conditions. Therefore, a semi-active inerter-based suspended device based on the linear quadratic regulator (LQR) control strategy is proposed to further enhance the dynamic performance. The rigid-flexible coupling vertical dynamic model of the train body and an underframe semi-active inerter-based suspended device are established. The structural parameters of the semi-active inerter-based suspended device are adjusted using LQR control strategy. Dynamic response of the system is obtained using the virtual excitation method. The dynamic characteristic of the system is evaluated using the Sperling index and compared with those of the passive and semi-active traditional suspended devices as well as the passive inerter-based suspended devices. The vertical vibration acceleration of the train body and Sperling index using the semi-active inerter-based suspended device is the smallest among the four suspended devices, which denotes the advantages of using the inerter and LQR control strategy. The semi-active inerter-based suspended device could decrease the vertical vibration acceleration of the train body and further suppress its elastic vibration in the lower frequency band, more effectively than the other three suspended devices. Overall, the semi-active inerter-based suspended device could significantly reduce elastic vibration of the train body and improve its dynamical performance.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141722
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic interactions stability analysis of hybrid renewable energy system with SSSC
    Autorzy:
    He, Ping
    Qi, Pan
    Ji, Yuqi
    Li, Zhao
    Powiązania:
    https://bibliotekanauki.pl/articles/1841302.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    damping characteristics
    dynamic interaction analysis
    eigenvalue analysis
    hybrid renewable energy system
    SSSC
    charakterystyka tłumienia
    dynamiczna analiza interakcji
    analiza wartości własnej
    hybrydowy system energii odnawialnej
    Opis:
    The static series synchronous compensator (SSSC) has demonstrated its capability in providing voltage support and improving power system stability. The objective of this paper is to analyze the dynamic interaction stability mechanism of a hybrid renewable energy system connected with doubly-fed induction generators (DFIGs) and solid oxide fuel cell (SOFC) energy with the SSSC. For this purpose, a linearized mathematical model of this modified hybrid single-machine infinite-bus (SMIB) power system is developed to analyze the physical mechanism of the SSSC in suppressing oscillations and the influence on the dynamic stability characteristics of synchronization. Typical impacting factors such as the series compensation level, the SOFC penetration and tie-line power are considered in the SMIB and two-area systems. The impact of dynamic interactions on enhancing damping characteristics and improving transient performance of the studied systems is demonstrated using eigenvalue analysis and dynamic time-domain simulations, which validates the validity of the proposed physical mechanism simultaneously.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 445-462
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of the spatial characteristics technique with the view of estimating the explosion wave impact on the stuck drilling string zone
    Wykorzystanie techniki charakterystyk przestrzennych do określania wpływu fali uderzeniowej na przychwyconą kolumnę przewodów wiertniczych
    Autorzy:
    Moisyshyn, V.
    Yacyshyn, V.
    Vytyaz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/219826.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metoda charakterystyk przestrzennych
    asymetria
    sprężystość dynamiczna
    odkształcenie
    walec grubościenny
    przekrój kołowy
    naprężenie
    fala uderzeniowa
    asymmetric problem of dynamic elasticity
    spatial characteristics technique
    stress caused deformation state of a thick walled circular cylinder
    explosion wave
    Opis:
    Studied here are the results of the asymmetric problem solution of the thick walled circular cylinder elasticity using the spatial characteristics technique. The practical implementation of the solution of the problem is based on the calculation of the stress-caused deformation state of the stuck drilling string zone affected by the explosion wave action upon the inner wall of the pipe. Suggested here is the technique for determining axual and circular stress on the drill pipe wall as well as the radial displacements of the stuck drill pipe outer surface under the action of the explosion shock wave. The above technique enables to make a sound selection of the cylindrical explosive charge weight in order to avoid the residual strain during the drilling string shaping off and uncoupling the threaded joints or to prevent them from exceeding the admissible level.
    W artykule przedstawiono wyniki uzyskane przy pomocy asymetrycznego rozwiązania zagadnienia związanego z elastycznością grubościennego walca o przekroju kołowym, w oparciu o metodę charakterystyk przestrzennych. Praktyczne zastosowanie tego rozwiązania opiera się na obliczeniu stanu odkształcenia strefy przy przychwyconej w otworze kolumnie przewodów wiertniczych spowodowanego naprężeniami wskutek oddziaływania fali uderzeniowej na wewnętrzne ściany przewodów. W pracy zaproponowano metodę określenia naprężenia osiowego i obwodowego działającego na ściany przewodów wiertniczych oraz przemieszczenia promieniowego u umocowanego przewodu pod wpływem oddziaływania fali uderzeniowej po wybuchu. Technika powyższa umożliwia dokonanie właściwego doboru wielkości ładunku wybuchowego w kształcie walca w celu uniknięcia naprężeń resztkowych w kolumnie przewodów wiertniczych, które mogłyby doprowadzić do jego odkształcenia lub poluzowania połączeń gwintowanych lub dla utrzymania wielkości tych naprężeń w dopuszczalnych normach.
    Źródło:
    Archives of Mining Sciences; 2012, 57, 3; 601-618
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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