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    Wyświetlanie 1-4 z 4
    Tytuł:
    Reduction of Deformations during Welding Metal Wire Mesh with Frames
    Autorzy:
    Krawczyk, R.
    Słania, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/356539.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    welding
    stresses
    deformations
    moment of inertia
    Opis:
    The article presents an issue referring to a reduction of deformation during welding metal wire mesh into the frames. A problem of a possible reduction of deformations was described taking into account characteristics of a construction of a welded element. Technological tests and their results are provided. Technological recommendations relating to the reduction of deformations of the welded element are given.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 529-534
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deflection of Steel Reinforced Concrete Beam Prestressed with CFRP Bar
    Autorzy:
    Selvachandran, P.
    Anandakumar, S.
    Muthuramu, K. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/353032.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cracked moment of inertia
    deformability
    effective moment of inertia
    neutral axis
    Partial Prestressig Ratio
    yielding point
    Opis:
    Carbon Fiber Reinforced polymer (CFRP) bars are weak in yielding property which results in sudden failure of structure at failure load. Inclusion of non-pretensioned steel reinforcement in the tension side of CFRP based prestressed concrete beam will balance the yielding requirements of member and it will show the definite crack failure pattern before failure. Experimental investigation has been carried out to study the deflection behavior of partially prestressed beam. Experimental works includes four beam specimens stressed by varying degree of prestressing. The Partial Prestressing Ratio (PPR) of specimen is considered for experimental works in the range of 0.6 to 0.8. A new deflection model is recommended in the present study considering the strain contribution of CFRP bar and steel reinforcement for the fully bonded member. New deflection model converges to experimental results with the error of less than 5% .
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1915-1922
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of adaptive electric drive control system of horizontal looper
    Autorzy:
    Breido, Iosif
    Kuntush, Yelena
    Powiązania:
    https://bibliotekanauki.pl/articles/141026.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electromechanical system
    horizontal looper
    synthesis of damping system
    variable inertia moment
    Opis:
    The article presents studies on the electromechanical system of a metallurgical horizontal looper in the steelmaking industry. During the operation of this unit, parameters in the system changes due to variations of length and mass of the steel strip, these variations significantly change elastic properties and reduce moments of inertia. Various methods of combating elastic vibrations in electromechanical systems are analyzed in this article. The article presents a description of experiments with a horizontal looper. A mathematical model for two extreme positions of the unit was developed based on experimental results. Simulation experiments were made and their results are presented. A new control system structure is proposed to reduce vibrations in the electromechanical system of a horizontal looper. A power-up sensor, adjuster and velocity derivative feedback were added into the model structure. The proposed feedback link structure takes into account the change of steel strip length. From the experimental data it follows that the proposed system provides effective damping of mechanical vibrations in the steel strip if its length during operation is changed.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 3; 679-694
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic stability of moderately thick beams and frames with the use of harmonic balance and perturbation methods
    Autorzy:
    Obara, P.
    Gilewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200456.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Bernoulli-Euler beam theory
    Timoshenko beam theory
    transverse shear deformation
    rotatory inertia
    natural frequency
    critical force
    areas of instability
    teoria wiązki Bernoulliego-Eulera
    teoria wiązki Tymoszenko
    moment bezwładności rotatora
    częstotliwość
    siła krytyczna
    obszary niestabilności
    Opis:
    The objective of this paper is to determine dynamic instability areas of moderately thick beams and frames. The effect of moderate thickness on resonance frequencies is considered, with transverse shear deformation and rotatory inertia taken into account. These relationships are investigated using the Timoshenko beam theory. Two methods, the harmonic balance method (HBM) and the perturbation method (PM) are used for analysis. This study also examines the influence of linear dumping on induced parametric vibration. Symbolic calculations are performed in the Mathematica programme environment.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 739-750
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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