Decomposes time or frequency measurements into *"resonance curves"* that represent the contribution of each mode shape or ODS to the measurement data. Solves the following equation for each M#, at each sample of data in a Data Block,

where:

[ Shape Table ] = matrix of mode shapes or operating deflection shapes (ODS's). Each matrix column is a mode shape or ODS.

{ Weights } = vector of weights (also called a participation vector), for each sample of time or frequency data in the Data Block

{ ODS } = the ODS of data at each sample for each sample of time or frequency data in the Data Block

Each resonance curve is saved as a *new* M# in a new Data Block. For example, if 10 mode shapes are used to decompose the time or frequency data in a Data Block, 10 M#s, each one a resonance curve for each mode, are calculated.

*Only mode shapes* are used for Modal Decomposition.

Modal *Frequency & Damping are not used*.

Data Block Showing Modal Decomposition Resonance Curves Overlaid.

Each modal decomposition resonance curve can be curve fit to extract the experimental modal frequency & damping associated with that resonance.