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Wyszukujesz frazę "Zhang, M.-H." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    New compensation scheme of magneto-optical current sensor for temperature stability improvement
    Autorzy:
    Chen, J.
    Li, H.
    Zhang, M.
    Zhang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/221874.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magneto-optical current sensor
    normalization
    Verdet constant
    birefringence
    Opis:
    A novel magneto-optical current sensor (MOCS) with two sensing arms is proposed to improve the temperature stability. One of the arms, with a highly stable permanent magnet attached and orthogonal to the other one, is designed to provide a reference that follows the temperature characteristics of the sensing material. By a normalization operation between two arms, the temperature drift is compensated adaptively and a sensing output proportional to the measured current can be reached. A dual-input and dual-output structure is specially designed for the reference sensing arm to demodulate the DC Faraday rotation angle. This scheme compensates simultaneously two main temperature influence factors, the Verdet constant and linear birefringence. Validation tests were carried out and are discussed.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 3; 611-616
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A fault diagnosis method for substation grounding grid based on the square-wave frequency domain model
    Autorzy:
    Zhang, P.-H.
    He, J.-J.
    Zhang, D.-D.
    Wu, L.-M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221635.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    square-wave
    frequency characteristics
    grounding grid
    fault diagnosis
    Opis:
    Current methods of fault diagnosis for the grounding grid using DC or AC are limited in accuracy and cannot be used to identify the locations of the faults. In this study, a new method of fault diagnosis for substation grounding grids is proposed using a square-wave. A frequency model of the grounding system is constructed by analyzing the frequency characteristics of the soil and the grounding conductors into which two different frequency square-wave sources are injected. By analyzing and comparing the corresponding information of the surface potentials of the output signals, the faults of the grounding grid can be diagnosed and located. Our method is verified by software simulation, scale model experiments and field experiments.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 63-71
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction algorithm for obtaining the bending deformation of the base of heavy-duty machine tool using inverse Finite Element Method
    Autorzy:
    Liu, M.
    Zhang, X.
    Song, H.
    Wang, J.
    Zhou, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/221566.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inverse Finite Element Method
    bending deformation
    heavy-duty machine tool
    reconstruction algorithm
    statically indeterminate structure
    Opis:
    The field of mechanical manufacturing is becoming more and more demanding on machining accuracy. It is essential to monitor and compensate the deformation of structural parts of a heavy-duty machine tool. The deformation of the base of a heavy-duty machine tool is an important factor that affects machining accuracy. The base is statically indeterminate and complex in load. It is difficult to reconstruct deformation by traditional methods. A reconstruction algorithm for determining bending deformation of the base of a heavy-duty machine tool using inverse Finite Element Method (iFEM) is presented. The base is equivalent to a multi-span beam which is divided into beam elements with support points as nodes. The deflection polynomial order of each element is analysed. According to the boundary conditions, the deformation compatibility conditions and the strain data measured by Fiber Bragg Grating (FBG), the deflection polynomial coefficients of a beam element are determined. Using the coordinate transformation, the deflection equation of the base is obtained. Both numerical verification and experiment were carried out. The deflection obtained by the reconstruction algorithm using iFEM and the actual deflection measured by laser displacement sensors were compared. The accuracy of the reconstruction algorithm is verified.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 4; 727-741
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel fibre Bragg grating curvature sensor for structure deformation monitoring
    Autorzy:
    Liu, M.-Y.
    Zhou, S.-G.
    Song, H.
    Zhou, W.-J.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/221816.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fibre Bragg grating
    curvature sensor
    large structure parts
    deformation monitoring
    Opis:
    Real-time monitoring of deformation of large structure parts is of great significance and the deformation of such structure parts is often accompanied with the change of curvature. The curvature can be obtained by measuring changes of strain, surface curve and modal displacement of the structure. However, many factors are faced with difficulty in measurement and low sensitivity at a small deformation level. In order to measure curvature in an effective way, a novel fibre Bragg grating (FBG) curvature sensor is proposed, which aims at removing the deficiencies of traditional methods in low precision and narrow adjusting. The sensor combines two FBGs with a specific structure of stainless steel elastomer. The elastomer can transfer the strain of the structure part to the FBG and then the FBG measures the strain to obtain the curvature. The performed simulation and experiment show that the sensor can effectively amplify the strain to the FBG through the unique structure of the elastomer, and the accuracy of the sensor used in the experiment is increased by 14% compared with that of the FBG used for direct measurement.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 577-587
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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