Wydział Mechaniczny / Faculty of Mechanical Engineering / W1

Stały URI zbioruhttp://hdl.handle.net/11652/1

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2016 - 201912020 - 20211

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Teraz wyświetlane 1 - 2 z 2
  • Pozycja
    Nonlinear Dynamics of Forced Oscillator Subjected to a Magnetic Interaction
    (Wydawnictwo Politechniki Łódzkiej, 2021) Skurativskyi, Sergii; Kudra, Grzegorz; Witkowski, Krzysztof; Wasilewski, Grzegorz; Awrejcewicz, Jan
    It is considered the system composed of a cart moving along a linear rolling bearing with harmonic excitation produced by a stepper motor with an unbalanced disk. The magnetic field is generated by a pair of non-point neodymium magnets, one of which is mounted on the cart, whereas another one is fixed on the guide out of the axis of oscillations. The mathematical model for the cart dynamics is derived where the scaled point dipoles approximation of magnetic interaction is used. The numerical and bifurcation analysis of the model presented is carried out and compared to the experimental results.
  • Pozycja
    Synchronization in arrays of coupled self-induced friction oscillators
    (Springer, 2016-11) Marszal, Michał; Saha, Ashesh; Jankowski, Krzysztof; Stefański, Andrzej; Katedra Dynamiki Maszyn. Wydział Mechaniczny. Politechnika Łódzka.; Division of Dynamics. Faculty of Mechanical Engineering. Lodz University of Technology.
    We investigate synchronization phenomena in systems of self-induced dry friction oscillators with kinematic excitation coupled by linear springs. Friction force is modelled according to exponential model. Initially, a single degree of freedom mass-spring system on a moving belt is considered to check the type of motion of the system (periodic, non-periodic). Then the system is coupled in chain of identical oscillators starting from two, up to four oscillators. A reference probe of two coupled oscillators is applied in order to detect synchronization thresholds for both periodic and non-periodic motion of the system. The master stability function is applied to predict the synchronization thresholds for longer chains of oscillators basing on two oscillator probe. It is shown that synchronization is possible both for three and four coupled oscillators under certain circumstances. Our results confirmed that this technique can be also applied for the systems with discontinuities.