Modal analysis - results exported - need to compute deflecti

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Discussion Overview

The discussion revolves around the computation of deflections using results from a modal analysis in the context of Fluid Structure Interaction (FSI) analysis. Participants are exploring how to combine modal analysis results with applied fluid forces to determine deflections.

Discussion Character

  • Technical explanation, Experimental/applied, Debate/contested

Main Points Raised

  • One participant describes having completed a modal analysis using a mesh of 150 shell elements and seeks guidance on computing deflections from the results and applied forces.
  • Another participant requests clarification on the initial post, indicating that the explanation was unclear.
  • The original poster later provides additional details, stating that they want to use modal superposition to combine modal analysis results with fluid forces for deflection computation.
  • A reference to a specific section of a paper is provided to illustrate the intended approach for achieving the analysis.

Areas of Agreement / Disagreement

The discussion does not appear to have a consensus, as there is a request for clarification and further details from one participant, indicating some confusion or disagreement about the initial explanation.

Contextual Notes

The discussion may be limited by the lack of detailed assumptions regarding the modal analysis results and the specific nature of the fluid forces being applied. There is also an absence of explicit mathematical steps or definitions that could clarify the process of combining the results.

nr765
Hello,

I have got results for a modal analysis (mesh of 150 shell elements) in ascii format. I have also got (from another process) forces to apply at each element; how do it compute the deflection? I get that it's a form of summation of all the modes, but I am stuck.

Thanks! BB
 
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Sorry but your posting doesn't make any sense at all .

Please explain more clearly what you are trying to do .
 
Sorry! here are more details.
I have done a modal analysis in a FEA software, I have looked at the modal shapes and frequencies (i.e. checked that everything made sense).
I'd like to use those results in a Fluid Structure Interaction (FSI) analysis where deflections are computed using modal superposition.

So what I have are 1/ the modal analysis results and 2/ the fluid forces (at each element). I'd like to "combine" them to yield the deflections.

Thanks,
Bb
 
What I am trying to achieved is described in section 2.B of this [paper](http://resources.altair.com/altairatc.com/country/united%20kingdom/atc2013_altair_fs_bonus2.pdf).
 

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