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    Wyświetlanie 1-4 z 4
    Tytuł:
    Impact absorption system based on MRE with Halbach array
    Autorzy:
    Bocian, M.
    Kaleta, J.
    Lewandowski, D.
    Przybylski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/128306.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    experimental mechanics
    smart material
    magnetorheological elastomer
    magnetic field
    modelling
    parametrization
    simulation
    mechanika doświadczalna
    materiał inteligentny
    elastomery magnetoreologiczne
    pole magnetyczne
    modelowanie
    parametryzacja
    symulacja
    Opis:
    This paper presents impact absorption system based on magnetorheological elastomer with Halbach magnetic arrays used for tuning. Its design and results of experimental evaluation are presented together with proposition of a non-linear model to describe the system. In the end validation of the model is presented based on energy and power balance method for its parametrization. This paper presents both novel approach to impact absorption and to modelling of a system based on smart material such as magnetorheological elastomer.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 47-54
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semi-active torsional vibration isolation utilizing magnetorheological elastomer
    Autorzy:
    Marzuki, W. M. R. W.
    Muthalif, A. G. A.
    Nordin, N. H. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/127776.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    magnetorheological elastomer
    MRE
    torsional vibration
    vibration isolation
    smart materials
    elastomer magnetoreologiczny
    drgania skrętne
    wibroizolacja
    materiały inteligentne
    Opis:
    In rotating machinery, unattenuated excessive torsional vibration leads to damage and excessive wear. This type of vibration, which is transferred from one structure to another can be estimated using torsional transmissibility factor (TTF). The value of the TTF describes the ratio of output to input and reaches its peak at the natural frequency. Hence, the ability to vary coupling stiffness of two rotating shafts will allow the control of the TTF towards better performance and preventions from fatigue loading. Traditionally, passive rubbers are used as a flexible coupling in between two shafts. However, the constant passive stiffness of the material limits its performance. To address this issue, an adaptive coupling based on magnetorheological elastomer (MRE) is proposed to achieve better TTF at varying frequencies. Mathematical modelling, simulation study and experimental results of MRE for torsional vibration isolation are presented in this work. Natural frequency obtained from the TTF shows an increase of about 3 Hz when current changed from 1 to 6 A.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-8
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Introduction to n-body simulation of magnetorheological elastomer (MRE) microstructure forming process
    Autorzy:
    Miedzińska, D.
    Łazowski, J.
    Boczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246185.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    magnetorheological elastomer
    n-body problem
    magnetic interactions
    smart materials
    forming process
    Opis:
    Magnetorheological elastomers (MREs) are the materials with rheological properties which can be changed in a continuous way, rapidly and reversibly by the applied magnetic field. They are the solid analogues of magnetorheological fluids (MRFs), consisting of magnetically permeable particles (such as iron) added to a viscoelastic polymeric material prior to crosslinking. In the paper the introduction to the n-body simulation of the MRE microstructure forming process is presented. First, the basics of the n-body problem are presented as the planar three-body problem. It is well known, that the planar three-body problem is the problem describing the motion of three point masses in the plane under their mutual Newtonian gravitation. In the paper it is shown how that problem will be applied to the simulation of the phenomena that appeared when the external magnetic field is applied to the chaotically mixed iron particles in the liquid elastomer. Also the physical model of the interactions occurred in such structures are described. The assumptions shown in the paper will be then used for the development of the computer program which calculates the interactions between iron dipoles and describes the movement of the particles in the liquid elastomer under the magnetic field.
    Źródło:
    Journal of KONES; 2010, 17, 1; 249-253
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the volume fraction of the carbonyl iron particles on the mechanical properties of the magnetorheological elastomers
    Autorzy:
    Sławiński, G.
    Niezgoda, T.
    Miedzińska, D.
    Gieleta, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/247437.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    smart materials
    magnetorheological elastomer (MRE)
    finite element method (FEM)
    Opis:
    Magnetorheological materials belong to the group of the so called intelligent materials. Their rheological properties can be changed in a large range using an external magnetic field. That is why they fmd ever growing application in modern technical equipment, among others in controlled dampers, clutches, sensors etc. In the paper, a numerical strength analysis of a magnetorheological material was presented. The influence of the volume fraction of carbonyl iron particles (the share of the carbonyl iron particles varied from 1.5 to 33.0 vol. %.) on the mechanical properties of the material were investigated, in particular on the Young's modulus variation. Experimental tests were carried out for specimens made of pure PU 70/30 elastomer with iron particles. They induded uniaxial compression tests. In the farmer case, specimens were in a shape of a cylinder with a diameter of 20 mm and a height of 25-30 mm. The results of experimental tests carried out in order to determine the parameters necessary to build the numerical model were induded in the paper. In the paper, an algorithm developed for determining the parameters for modelling the structure was presented. A fragment of the structure, containing several particles of iron and some quantity of elastomer, corresponding to the assumed volume fractions, was subjected to numerical analysis.
    Źródło:
    Journal of KONES; 2010, 17, 3; 401-406
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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