What is FRF-based Curve Fitting?

FRF-based curve fitting is a process of matching a parametric model of an FRF (in a least squared error sense) to a set of experimental FRF data.

After curve fitting is completed, mode shapes are stored into a Shape Table from which they can be displayed in animation on a 3D model of the test article.

Curve Fitting Steps

  1. Determine the Number of Modes in a frequency band of measurement data

  2. Estimate modal Frequency & Damping for all modes in the frequency band

  3. Estimate modal Residues (mode shape components) for each mode and each measurement