Estimating experimental dispersion curves from steady-state frequency response measurements

Dispersion curves characterize the frequency dependence of phase and group velocities propagating elastic waves. Many analytical numerical techniques produce dispersion from physics-based models. However, it is often challenging to accurately model engineering structures with intricate geometric features inhomogeneous material properties. For such cases, this paper proposes a novel method estimate experimental data-driven Experimental response functions (FRFs) are used develop models, {which then curves}. The advantages approach over other traditionally transient stem need conduct only steady-state experiments. In comparison, experiments higher-sampling rate for wave-propagation applications more susceptible noise. vector-fitting (VF) algorithm adopted models in-plane out-of-plane FRFs one-dimensional structure. quality corresponding estimates evaluated using an Timoshenko beam as baseline. (using FRFs) anti-symmetric ($A_0$) velocity maximum error $4\%$ 40~kHz band. contrast, estimated resulted in $6\%$ same