Minimum mass participation setting for modal analysis
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Minimum mass participation setting for modal analysis
When performing a modal analysis, you can get a lot of modes with low or near zero mass participation. The results is a lot of garbage data. When moving on to a random vib or other vib analysis whose input data is from the modal run, the inputs are overwhelming to the solution.
The suggestion is to put a threshold parameter of "minimum reported mass participation" in the model that will delete the results under that threshold, thereby delivering a clean input set to the random vib analyses.
I ran another linear analysis in order to determine the natural frequencies of an electronic assembly and got swamped with excessive almost zero mass participation frequencies.
It seems that there is some sort of variable in the software controlling that, I remember getting a few frequencies removed from the results because of mass participation below 1-E-06 or something...
No way to find a set to fix the minimal mass participation, as far I can find... Running lot of shell model mass and participation almost reach 25% for all modes, it would be important to set a parameter as suggested, where any participation less than 85% to be over written.. Any suggestion from autodesk?
