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Wednesday, July 10 • 17:30 - 17:50
MATERIAL PARAMETER IDENTIFICATION OF COUPLED RESONANT SYSTEMS USING IMPEDANCE TUBES

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This work studies the estimation of material properties in complex systems subjected to dynamic coupling and exhibiting a resonant behaviour. The model parameter search can be conveniently formulated as an inverse estimation procedure consisting in minimising a distance between predicted and measured responses. However, classical optimisation algorithms face the existence of local minima, which are due to resonances and geometrical symmetries in the system of interest. An incremental approach is here presented, consisting of an estimation of the model parameters using a sequence of sub-problems. The starting sub-problem is chosen as a limiting case where the system exhibits an asymptotic, non-resonant behaviour, sensitive to a subset of the unknown model parameters. Subsequent sub-problems gradually incorporate the full complexity of the problem and its sensitivity to the complete set of model parameters. As a result, the inverse estimation procedure is guided to the true solution of the problem, while avoiding local minima. The approach is applied to the estimation of geometrical and material properties of systems including expansion chambers and porous media, using impedance tube measurements as the experimental target. In order to examine the methodology and its inherent features, two inversion approaches are applied, namely a deterministic framework using a gradient-based optimiser and a Bayesian framework using a Markov chain Monte Carlo method. In particular, the sensitivity of the solution to variations in the model parameters is explored at the various stages of the step-wise procedure.

Moderators
EA

Edoardo Alessio Piana

PhD, University of Brescia
OR

Olivier Robin

Research professional, Groupe d'acoustique de l'université de Sherbrooke
avatar for Bert Roozen

Bert Roozen

prof.dr.ir., KU Leuven
CS

Chiara Scrosati

MSc in Physics, Construction Technologies Institute ITC of the National Research Council of Italy

Authors

Wednesday July 10, 2019 17:30 - 17:50 EDT
Westmount 4
  T08 Mat. for noise & vibr. cntrl., SS04 Chrctrz of ac materials