Wydział Mechaniczny / Faculty of Mechanical Engineering / W1

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

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Filtry

2007 - 200912010 - 20153

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Tematsearch.filters.applied.operator.equals: search.filters.subject.symulacje numeryczne

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Teraz wyświetlane 1 - 4 z 4
  • Pozycja
    Modelling and numerical simulations of a pendulum elastically suspended and driven by frictional contact with rotating disk.
    (Politechnika Łódzka. Wydział Mechaniczny. Katedra Automatyki, Biomechaniki i Mechatroniki., 2015) Kudra, Grzegorz; Awrejcewicz, Jan
    The work concerns modelling and numerical simulations of a special kind of physical pendulum frictionally driven. The pendulum’s joint is suspended elastically in the plane of the motion resulting in the full plane motion of the pendulum and in tree degrees of freedom of the analysed mechanical system. The pendulum is driven by frictional contact with a disk with a constant angular velocity. Examples of self-excited oscillations and bifurcation dynamics of the pendulum are presented. Majority of the work focuses on efficient approximate modelling of the resultant friction force and moment occurring on the contact surface.
  • Pozycja
    Mechanical systems with two nonlinear springs connected in series.
    (Politechnika Łódzka. Wydział Mechaniczny. Katedra Automatyki, Biomechaniki i Mechatroniki., 2015) Starosta, Roman; Sypniewska-Kamińska, Grażyna; Awrejcewicz, Jan
    The aim of the paper is analysis of dynamical regular response of the nonlinear oscillator with two serially connected springs of cubic type nonlinearity. Behaviour of such systems is described by a set of differential-algebraic equations (DAEs). Two examples of systems are solved with the help of the asymptotic multiple scales method in time domain. The classical approach has been appropriately modified to solve the governing DAEs. The analytical approximated solution has been verified by numerical simulations.
  • Pozycja
    On the clutch dynamics with the approximations of resulting contact forces.
    (Politechnika Łódzka. Wydział Mechaniczny. Katedra Automatyki, Biomechaniki i Mechatroniki., 2015) Wojtunik, Igor; Szewc, Michał; Kudra, Grzegorz; Awrejcewicz, Jan
    The aim of the work is to present effectiveness of numerical simulations of clutch with frictional contacts, elaborated by some of the current articles in the last few years. The friction models assumes full developed sliding and the classical Coulomb friction law on each element of the contact with general shape and any pressure distribution. Then special modification of the integral model of friction force and moment are proposed. The approximants based on Padé approximants and their generalizations. In the work the clutch dynamics with contacts forces model is presented. The system was simplified to friction disk on rotating master disk. Two different configurations are investigated: coaxial and non-coaxial arrangement of the two disks. For the appropriate rotations speed, the system of non-coaxial arrangement can exhibit the ability to self-centering. The models based on generalizations of Padé approximants are compared with the simulation results obtained by the use of approximants based on Taylor’s expansion and models with exact integral expressions for friction force and torque components.
  • Pozycja
    The triple pendulum with barriers and the piston - connecting rod - cranckshaft model.
    (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007) Awrejcewicz, Jan; Kudra, Grzegorz
    A model of a flat triple pendulum with obstacles imposed on its position is used for the modelling of a piston-connecting rod-cranks haft system of a mono-cylinder four-stroke combustion engine. The introduced self-excited system can be only treated as the first step in more advanced modelling of real processes, but some examples of numerical simulations exhibit well known six stages of the piston sliding along the cylinder surface per cycle.