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  1. Owheel

    Combining Modal Effective masses in the 6 degrees of freedom into a single value

    Hi Thomas, Thanks for the reply. I am analysing an aerospace structure, and I have a requirement that states that all modes with a total effective mass fraction of >10% have to be above X Hz. I have no idea how to calculate this total effective mass fraction from the data from NASTRAN. Does...
  2. Owheel

    Combining Modal Effective masses in the 6 degrees of freedom into a single value

    Hello, I have spent a couple of days fruitlessly searching forums for the answer, but I haven't found it yet so I thought I was ask it here. I have seen that in modal analyses, often there is a percentage for each mode which tells you how much of the overall mass is participating in that mode...

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