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    Wyświetlanie 1-6 z 6
    Tytuł:
    Coupled static and dynamic buckling modelling of thin-walled structures in elastic range review of selected problems
    Autorzy:
    Kołakowski, Z.
    Teter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/387475.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    interaction
    buckling
    thin-walled structures
    FEM
    analytical-numerical method
    review
    odkształcenia
    konstrukcje cienkościenne
    metoda analityczno-numeryczna
    metoda elementów skończonych
    MES
    Opis:
    A review of papers that investigate the static and dynamic coupled buckling and post-buckling behaviour of thin-walled structures is carried out. The problem of static coupled buckling is sufficiently well-recognized. The analysis of dynamic interactive buckling is limited in practice to columns, single plates and shells. The applications of finite element method (FEM) or/and analytical-numerical method (ANM) to solve interaction buckling problems are on-going. In Poland, the team of scientists from the Department of Strength of Materials, Lodz University of Technology and co-workers developed the analytical-numerical method. This method allows to determine static buckling stresses, natural frequencies, coefficients of the equation describing the post-buckling equilibrium path and dynamic response of the plate structure subjected to compression load and/or bending moment. Using the dynamic buckling criteria, it is possible to determine the dynamic critical load. They presented a lot of interesting results for problems of the static and dynamic coupled buckling of thin-walled plate structures with complex shapes of cross-sections, including an interaction of component plates. The most important advantage of presented analytical-numerical method is that it enables to describe all buckling modes and the post-buckling behaviours of thin-walled columns made of different materials. Thin isotropic, orthotropic or laminate structures were considered.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 2; 141-149
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some aspects of dynamic coupled response of functionally graded thin-walled columns with square cross-sections under in-plane pulse compression
    Autorzy:
    Kołakowski, Z.
    Teter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/279439.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    FGM
    dynamic response
    interactive buckling
    thin-walled structures
    compression
    pulse load
    Opis:
    The present paper deals with a dynamic coupled response of functionally graded columns with a quadratic cross-section subjected to an in-plane pulse loading. An Al-TiC metal- -ceramic material is applied. It is assumed that functionally graded materials (FGMs) are subject to Hooke’s law. The thin-walled structures are simply supported at the ends. This study is devoted to the stability problem of rectangular dynamic pulse load. The effects of temperature, wave propagation and damping are neglected. In order to obtain the equations of motion of individual plates, the classic laminate plate theory (CLPT) has been modified in such a way that it additionally accounts for all components of inertial forces. A plate model is adopted for the structures. The problem of an interaction of the global mode with the local ones is concerned (i.e., a three-modes approach). Attention has been focused on some unexpected aspects related to dynamic interactive buckling of columns having two axes of the cross-section symmetry. In the present study, a new approach to the description of this phenomenon, based on Koiter’s theory, has been applied.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 449-462
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and experimental studies on the rotating rotor with three active composite blades
    Badania numeryczne i eksperymentalne wirującego wirnika z trzema aktywnymi łopatami kompozytowymi
    Autorzy:
    Mitura, A.
    Gawryluk, J.
    Teter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/301648.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    Aktywator MFC
    laminat
    efekt usztywniający
    efekt zmiękczający
    MES
    MFC actuator
    laminate
    stiffening effect
    softening effect
    FEM
    Opis:
    In this paper, the dynamic behaviour of active composite blades were considered. Both numerical and experimental studies were performed. It was assumed that the rotor hub would be rotated at constant velocity. Experimental measurements were made. A special test rig was built which consisted of an active rotor with three composite blades, an electric drive system and a system of Digital Signal Processors. This DSP system was used for the excitation of the blades, control of the hub’s rotary velocity and data acquisition. The MFC patch and strain-gauge sensors were used. The influence of the hub’s rotary velocity and/or piezoelectric effect on the dynamic behaviour of the blades was determined. The numerical simulations were performed using two commercial simulation programmes: Abaqus and Matlab.
    W niniejszej pracy przedstawiono dynamikę aktywnych łopat kompozytowych. Przeprowadzono badania numeryczne i eksperymentalne. Założono, że wirnik obraca się ze stałą prędkością obrotową. Pomiary doświadczalne wykonano na stanowisku badawczym, składającym się z aktywnego wirnika z trzema łopatami, elektrycznego układu napędowego oraz procesora sygnałowego DSP. Układ elektroniczny z procesorem wykorzystano do wzbudzania łopat, kontroli prędkości obrotowej oraz pozyskania danych pomiarowych. W badaniach laboratoryjnych użyto elementy aktywne typu MFC oraz czujniki tensometryczne. W pracy określono wpływ prędkości obrotowej piasty oraz efektu piezoelektrycznego na dynamikę łopat. Symulacje numeryczne przeprowadzono z zastosowaniem programów: Abaqus oraz Matlab.
    Źródło:
    Eksploatacja i Niezawodność; 2017, 19, 4; 571-579
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modal Analysis of Laminated “CAS” and “CUS” Box-Beams
    Autorzy:
    Gawryluk, J.
    Bocheński, M.
    Teter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/140267.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thin-walled structures
    composite
    finite element method
    FEM
    coupling
    vibration
    eigenvalue problem
    experimental method
    struktury cienkościenne
    kompozyt
    metoda elementów skończonych
    MES
    sprzężenie
    wibracje
    zagadnienie własne
    metoda eksperymentalna
    Opis:
    In the paper, the authors discuss the numerical and experimental modal analysis of the cantilever thin-walled beams made of a carbon-epoxy laminate. Two types of beams were considered: circumferentially asymmetric stiffness (i.e., CAS) and circumferentially uniform stiffness (i.e., CUS) beams. The layer-up configurations of the laminate were chosen to get a vibration mode coupling effect in both analysed cases. The aim of the paper was to perform the numerical and experimental modal analysis of the composite structures, when a flapwise bending with torsion coupling effect or flapwise-chordwise bending coupling effect took place. Firstly, numerical studies by the finite element method was performed. The numerical simulations were carried out by the Lanczos method in the Abaqus software package. The natural frequencies and the corresponding free vibration modes were determined. Next, the experimental modal analyses of the CAS and CUS beams were performed. The test stand was consisted of a special grip, two beams with an adhered holder, the LMS Scadas III system with a modal hammer and an acceleration sensor. Finally, the results of both methods were compared.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 4; 441-454
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An influence of the d311 effect on the behavior of the cantilever beam-shaped piezoelectric activator made of two layers of pvdf with inverse polarity
    Autorzy:
    Teter, A.
    Gawryluk, J
    Warmiński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/118085.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    electro-mechanically coupling
    activator
    piezoelectric
    bimorph
    natural frequencies
    Opis:
    In the present work an example of the numerical modeling of electro-mechanical coupling of the activator in the form of cantilever beam made of two layers PVDF subjected to an inverse polarity is described. Calculations were done for static deflections at the selected voltage levels and for modal analysis with an included and excluded piezoelectric effect. The effect of active material on the behavior of the beam was examined. In order to validate the model, results of the static calculation were compared with the strict analytical solution and the results presented by other authors.
    Źródło:
    Applied Computer Science; 2014, 10, 3; 23-33
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Texture characteristics of raw rapeseed honey after storage at room temperature or freezing and heating up to 50°C
    Autorzy:
    Florek, M.
    Kędzierska-Matysek, M.
    Teter, A.
    Matwijczuk, A.
    Czernel, G.
    Skałecki, P.
    Domaradzki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082674.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    rapeseed honey
    storage
    temperature
    rheology
    texture
    Opis:
    The effects of storing honey for 18 months at room temperature or in a freezer as well as the impact of heating it to different temperatures (30, 40 and 50°C) were studied. The rheological parameters of fresh rapeseed honey were compared to those of the non-stored and unheated samples (control). The storage temperature significantly influenced the rheological behaviour of the honey (except adhesiveness). Higher values of all textural parameters were found in frozen honey in comparison with control and room temperature samples. However, in comparison with the control samples, higher values (around twice) of the dynamic viscosity, firmness, work and adhesive force were produced by honey stored at room temperature. Thermal treatment of the honey heated at 30, 40 and 50°C influenced a continuous decrease in all of the textural properties (with the exception of the cohesive force) compared to the control samples (20°C). The average change in the texture-temperature coefficient for dynamic viscosity, firmness, work, adhesiveness and adhesive force from 20 to 50°C was similar (between 6.62 and 4.09%). Significant, very close and positive Spearmen’s rank correlations (0.894 ≤ rS ≤ 0.987) were observed for dynamic viscosity, firmness, work, adhesiveness and adhesive force. Lower correlations (0.524 ≤ rS ≤ 0.684) were found between the cohesive force and all of the other textural properties.
    Źródło:
    International Agrophysics; 2020, 34, 1; 57-64
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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