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Chatter in Impacting Systems


Title: Chatter in Impacting Systems

Friday, October 7, at 4pm, in A2-002.

Dr. Petri Piiroinen (National University of Ireland Galway)

Abstract: This talk considers dynamical systems that are derived from mechanical systems with impacts. I will give some background and describe the basic dynamic behaviours of systems with impacts. In particular I will focus on chattering—accumulation of impacts—for which the idea of local discontinuity mappings will be discussed. For the discontinuity mappings I will first show how to use them in simulation schemes, and secondly how the mappings are used to calculate the stability of limit cycles with chattering by solving the first variational equations.

If you have any questions regarding this seminar, please direct them to Iain Moyles (061 233726,

 A full list of upcoming seminars can be found at


Supported by Science Foundation Ireland funding, MACSI - the Mathematics Applications Consortium for Science and Industry (, centred at the University of Limerick, is dedicated to the mathematical modelling and solution of problems which arise in science, engineering and industry in Ireland.