Discontinuity, Nonlinearity, and Complexity
Mathematical Modelling and Simulation of the Bifurcational Wobblestone Dynamics
Discontinuity, Nonlinearity, and Complexity 3(2) (2014) 123132  DOI:10.5890/DNC.2014.06.002
Jan Awrejcewicz; Grzegorz Kudra
Department of Automation, Biomechanic and Mechatronics, Lodz University of Technology, Lodz Poland
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Abstract
The Celtic stone, sometimes also called wobbles tone or rattleback usually is a semiellipsoidal solid with a special mass distribution. Most celts lied on aflat and horizontal base, set in rotational motion around a vertical axis can rotate in only one direction. In this work the dynamics of the celt is simulated numerically, but the solid is forced untypically, i.e. it is situated on a harmonically vibrating base. Essential part of the model are approximate functions describing the contact forces, i.e. dry friction forces and rolling resistance. They are based on previous works of the authors, but some modifications of friction model are made, which can be described as a generalization of the earlier used Padé approximants. Periodic, quasiperiodic and chaotic dynamics of a harmonically forced rattleback is found and presented by the use of Poincaré maps and bifurcation diagrams.
Acknowledgments
This paper was financially supported by the National Science Centre of Poland under the grant MAESTRO 2, No. 2012/04/A/ST8/00738, for years 20132016.
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