Scaling mass of flexbody

Question

I've got a flexbody that I want to scale the mass +/-10% for a design study. There are alot of property/material cards in the model so doing this manually is a bit of a pain. My initial thought was to use PARAM,WTMASS,1.10 etc in the Nastran ADAMSMNF run to generate a MNF with +10% mass, but it doesn't appear to have any effect. I understand that Adams relies on the DTI,UNITS input but is there any way to make WTMASS work as well? Any other alternatives?

Krystian Kuczek · Accepted Answer

Hi Michael,

Please try new functionality of Adams/Flex which is "MNF --> MNF Editor". You can simply put your input MNF file, then adopt modal scaling factors, e.g. for mass and specify name for output MNF file. After clicking "File Processing Button" icon process does start and produces new MNF file. You do not even need start new Nastran job.

Please see attached picture:

I hope it helps.

Best regards,

Krystian