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


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".

Can some-one point me in the right direction? Best Regards

  • $\begingroup$ Is this earthquake/structural dynamics related perchance? $\endgroup$
    – morbo
    Jan 9 '20 at 22:01
  • $\begingroup$ Engine/structural dynamics $\endgroup$ Jan 9 '20 at 22:03

I assume you will be doing this in a software, matlab or Abaqus for example, it’s not particularly easy thing to do with your given info, but. Perhaps this example method will help

  1. Abaqus
  2. Infos at csiamerica
  3. Matlab function

I am unsure how directly your data types will fit, but these are some links to get you started

  • $\begingroup$ I suspect i will have to use matlab. I dont see any reference to abaqus in the link. $\endgroup$ Jan 9 '20 at 22:22
  • $\begingroup$ The first paragraph clearly states and talks about abaqus $\endgroup$
    – morbo
    Jan 9 '20 at 22:25
  • $\begingroup$ @user9106985 see update $\endgroup$
    – morbo
    Jan 9 '20 at 22:28
  • $\begingroup$ Many thanks... I will look at the matlab function. $\endgroup$ Jan 9 '20 at 23:01

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