Artykuły (WM)

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

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2005 - 200912010 - 20162

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Teraz wyświetlane 1 - 3 z 3
  • Pozycja
    The Dynamic Model of Plane Mechanism with Variable Ratio.
    (Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Cink, Jacek; Kosucki, Andrzej
    The paper contains the proposal how to reduce many–elements plane mechanism with one degree of freedom to chosen axis or line as one–element model of mechanism. Mostly the place of reduction is driving element in rotary motion (for example, shaft of electric motor) or element in linear motion (for example, piston rod of hydraulic cylinder). The way of determining reduced load and reduced mass of the model is described. Presented mathematical description let determine: firstly, required driving torque or force to provide the suitable acceleration when loads of element are known and secondly, the acceleration (angular or linear) of driving element as result of known driving torque or force and loads of element.
  • Pozycja
    Some remarks on dynamic results for averaged and exact models of thin periodic plates.
    (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2005) Jędrysiak, Jarosław; Michalak, Bohdan
    The aim of the paper is to show certain justification of the new non-asymptotic model of thin periodic plates, derived using the tolerance averaging (Wo?niak and Wierzbicki, 2000). The model describes the effect of periodicity cell size on overall plate behaviour, on the contrary to known homogenised models. Results obtained from those models will be compared to solution to and from the "exact" discrete model. It is shown that for long-wave propagation problems, results obtained for a special case of a periodic plate strip (weightless but covered by a periodically distributed system of two concentrated masses) within the non-asymptotic model are close results calculated from the known "exact" solutions based on the method used to analyse longitudinal vibrations of one-dimensional diatomic lattice (Brillouin, 1953). Similar conformity, taking place in special cases of short waves, is also presented.
  • Pozycja
    Dynamic behavior of an axially moving wide web.
    (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2012) Cedrowska, Agnieszka; Marynowski, Krzysztof
    Theoretical and experimental dynamic analysis of an axially moving wide composite web is presented in this paper. The mathematical model of the system under consideration has the form of a differential equation with partial derivatives. The approximate solution using the extended Galerkin method has been determined in this work. Dynamic analysis allowed one to determine the natural frequency of bending and torsional vibrations of the web. Experimental investigations of dynamic behavior of the axially moving web was performed on a laboratory stand in the form of belt transmission. The experimental verification of numerical studies concerned the lowest frequencies of bending and torsional vibrations. The fundamental frequency of bending vibration was determined numerically with the greatest accuracy. accuracy.