Modal coordinates time history

2020 1 9
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Hi All,
I have a query regarding the calculation of the so called “Modal Participation Factor time signal” from a combination of
a) transfer functions (amplitude and phase for each eigenmode) obtained from "unit" accel loading in an FEM model
and
b) real accel-time test data.
I would like to somehow combine the above 2 to obtain the so called "modal participation factor time history" using suitable matlab functions.
Can somehone point me in the right direction?
Best Regards
D

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