Artykuły (WM)

Stały URI dla kolekcjihttp://hdl.handle.net/11652/206

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2010 - 201922020 - 20221

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Ma przypisane plikisearch.filters.applied.operator.equals: TakTematsearch.filters.applied.operator.equals: search.filters.subject.pole magnetyczne

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  • Pozycja
    Guidance of the resonance energy flow in the mechanism of coupled magnetic pendulums
    (Elsevier, 2022) Pilipchuk, Valery N.; Polczyński, Krystian; Bednarek, Maksymilian; Awrejcewicz, Jan
    This paper presents a methodology of controlling the resonance energy exchange in mechanical system consisting of two weakly coupled magnetic pendulums interacting with the magnetic field generated by coils placed underneath. It is shown that properly guided magnetic fields can effectively change mechanical potentials in a way that the energy flow between the oscillators takes the desired direction. Studies were considered by using a specific set of descriptive functions characterizing the total excitation level, its distribution between the pendulums, and the phase shift. The developed control strategies are based on the observation that, in the case of antiphase oscillation, the energy is moving from the pendulum subjected to the repelling magnetic field, to the oscillator under the attracting field. In contrast, during the inphase oscillations, the energy flow is reversed. Therefore, closed-loop controller requires only the information about phase shift, which is easily estimated from dynamic state signals through the coherency index. Advantage of suggested control strategy is that the temporal rate of inputs is dictated by the speed of beating, which is relatively slow compared to the carrying oscillations.
  • Pozycja
    Analysis of magnetic field effect on ferromagnetic spheres embedded in elastomer pattern.
    (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2010) Boczkowska, Anna; Czechowski, Leszek; Jaroniek, Mieczysław; Niezgoda, Tadeusz
    The results of modelling of the magnetorheological elastomers (MREs) microstructure using Finite Elements Method (FEM) are shown. MREs are solids analogous to magnetorheological fluids consisting of carbonyl-iron particles and a soft elastomer matrix. Fabrication of MREs is performed in an external constant magnetic field. Due to the presence of this field, the ferromagnetic particles tend to arrange themselves into elongated chains according to the magnetic field lines. FEM analysis of the MREs microstructure takes into account two cases: magnetic power and elastic vectors as well as their interactions between the components of the composite. The paper describes spatial ordering of the particles based on their interactions with the magnetic field. Two phenomena were taken into account: the force of a magnetic field and the local magnetic dipoles. Both fields have been modelled for a circular conductor with electrical current.
  • Pozycja
    Stan naprężenia w elastomerze zawierającym cząstki ferromagnetyczne w polu magnetycznym.
    (Stowarzyszenie Inżynierów i Techników Mechaników Polskich, 2010) Boczkowska, Anna; Czechowski, Leszek; Jaroniek, Mieczysław; Niezgoda, Tadeusz
    Przedstawiono wyniki analizy modelowania metodą elementów skończonych oraz badań metodą elastooptyki magnetoreologicznego elastomeru w obecności pola magnetycznego. Celem przeprowadzonych symulacji numerycznych i badań eksperymentalnych było uzyskanie wiedzy o wzajemnym oddziaływaniu elastomeru i kulek żelaza (wyznaczenie wartości odkształcenia i naprężenia) oraz zdobycie doświadczenia niezbędnego do modelowania takich oddziaływań na poziomie mikrostruktury w rzeczywistym elastomerze zawierającym cząstki żelaza o wymiarach mikronowych.