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Contact force models and dynamics of a drifting oscillator

Abstract:

The modelling of vibro-impact systems used in industry requires accurate description of the contact force between its impacting members. In this paper, the influence of contact force models on the global and local dynamics of a drifting oscillator is investigated. Three contact force models are examined in this study, namely: the Kelvin-Voigt (KV), the Hertz stiffness (HS) and the nonlinear contact stiffness and damping (NSD) models. Analysis of the considered system reveals that the local and global dynamic behaviour depend on the choice of contact force model. The short-term (local) dynamic response for the system are almost identical for all the three models . However, results for the long-term (global) dynamics of the system depend on the choice of contact force model; while the results for HS model are topologically similar to those of the KV model, the corresponding results for NSD are different from the other two models. Copyright © 2009 by ASME.