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How to improve the modal participation factor

I am using the Flex Prep tool of Motionview to generate a flexible model in my multibody model (from a .fem of optistruct). At the end, I do not obtain high modal participation factors for selected modes. First 3 modes have a factor of 0.15, 0.05 and 0.03. After, it drops under 0.5%. I am looking to obtain a sum of participation factors close to 100%.

Where should I investigate to increase those modal participation factors ?

(Can you give me more details of how those participation factors are calculated ?)

Thank you,

Benjamin

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Altair Forum User

Hi,

Use PFMODE to output Modal participation factor in H3D or Punch file formats. This option is available in Global_Control_Cards in OptiStruct. Insert the card before you prepare for flexbody.

You can also try HGMODFAC Available in Global_Control_Cards>> OUTPUT this will output for HyperGraph.

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Coming to how to change modal participation factor, Modal participation for a mode somehow depends on Mass. So mass is the key variable.

Altair Forum User

Thank you for those informations !

Altair Forum User

When using the Flex Prep, the .prp file does not contain the PFMODE that I added in the .fem file of OptriStruct.

How can I add it ?

Thank you,

Benjamin

Altair Forum User

Hi Benjamin,

Add, PFMODE in base .fem file and try again.