Nonlinear system identification of mechanical interfaces based on wave scattering

Keegan J. Moore, Mehmet Kurt, Melih Eriten, D. Michael McFarland, Lawrence Bergman, Alexander F. Vakakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We study stress wave propagation in two impulsively forced split Hopkinson bar systems: one with a prestressed interface and one with a frictional interface. We first consider only primary wave transmission and reflection, allowing for reduction of the problem to a first-order, strongly, nonlinear ordinary differential equation. A high-order finite element model is then developed and used to validate the results of the primary-pulse model. A spring that hardens with increasing preload is used to model the prestressed interface while an Iwan element is used to model the frictional interface. Using the primarywave propagation model, we perform nonlinear system identification by matching simulation and experiment results and identify the nonlinear hardening characteristics for the prestressed interface and Iwan parameters for the frictional interface. These parameters are then used in the finite element model to compare the experimentally measured secondary effects with the simulated effects. Our results demonstrate that the primary-wave propagation model can be used as a reduced order model for nonlinear system identification at a fraction of the computational cost of higher-order models.

Original languageEnglish (US)
Title of host publicationDynamics of Coupled Structures - Proceedings of the 34th IMAC, A Conference and Exposition on Structural Dynamics 2016
EditorsDaniel Rixen, Matt Allen, Randall L. Mayes
PublisherSpringer New York LLC
Number of pages7
ISBN (Print)9783319297620
StatePublished - Jan 1 2016
Event34th IMAC, A Conference and Exposition on Structural Dynamics, 2016 - Orlando, United States
Duration: Jan 25 2016Jan 28 2016

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Other34th IMAC, A Conference and Exposition on Structural Dynamics, 2016
CountryUnited States


  • Interface dynamics
  • Iwan elements
  • Mechanical joints
  • Nonlinear system identification
  • Wave propagation

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

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