Nonlinear model updating applied to the IMAC XXXII Round Robin benchmark system

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

Research output: Contribution to journalArticlepeer-review

Abstract

We consider the application of a new nonlinear model updating strategy to a computational benchmark system. The approach relies on analyzing system response time series in the frequency-energy domain by constructing both Hamiltonian and forced and damped frequency-energy plots (FEPs). The system parameters are then characterized and updated by matching the backbone branches of the FEPs with the frequency-energy wavelet transforms of experimental and/or computational time series. The main advantage of this method is that no nonlinearity model is assumed a priori, and the system model is updated solely based on simulation and/or experimental measured time series. By matching the frequency-energy plots of the benchmark system and its reduced-order model, we show that we are able to retrieve the global strongly nonlinear dynamics in the frequency and energy ranges of interest, identify bifurcations, characterize local nonlinearities, and accurately reconstruct time series. We apply the proposed methodology to a benchmark problem, which was posed to the system identification community prior to the IMAC XXXII (2014) and XXXIII (2015) Conferences as a “Round Robin Exercise on Nonlinear System Identification”. We show that we are able to identify the parameters of the non-linear element in the problem with a priori knowledge about its position.

Original languageEnglish (US)
Pages (from-to)111-122
Number of pages12
JournalMechanical Systems and Signal Processing
Volume88
DOIs
StatePublished - May 1 2017

Keywords

  • Frequency-energy plots
  • Nonlinear model updating
  • Nonlinear system identification
  • Reduced-order modeling

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Civil and Structural Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications

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