Journal
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
Volume 44, Issue 10, Pages 1011-1023Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijnonlinmec.2009.05.009
Keywords
Rigid body mechanics; Coulomb friction; Impact; Non-smooth; Bifurcation; Discontinuities
Categories
Funding
- U.S. National Science Foundation [0635469]
- UK EPSRC
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0635469] Funding Source: National Science Foundation
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This paper concerns the non-smooth dynamics of planar mechanical systems with isolated contact in the presence of Coulomb friction. Following Stronge [impact Mechanics, Cambridge University Press, Cambridge, 2000], a set of closed-form analytic formulae is derived for a rigid-body impact law based on an energetic coefficient of restitution and a resolution of the impact phase into distinct segments of relative slip and stick. Thus, the impact behavior is consistent both with the assumption of Coulomb friction and with the dissipative nature of impacts. The analysis highlights the presence of boundaries between open regions of initial conditions and parameter values corresponding to distinct forms of the impact law and investigates the smoothness properties of the impact law across these boundaries. It is shown how discontinuities in the impact law are associated with discontinuity-induced bifurcations of periodic trajectories, including non-smooth folds and persistence scenarios. Numerical analysis of an example mechanical model is used to illustrate and validate the conclusions. (C) 2009 Published by Elsevier Ltd.
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