Structural Dynamics

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  3. What does the warning “Diagonal of the mass matrix is missing in file” indicate when using RSTMAC command?

What does the warning “Diagonal of the mass matrix is missing in file” indicate when using RSTMAC command?

Tagged: mass matrix, RSTMAC
    • June 6, 2022 at 9:58 am
      FAQFAQ
      Participant

      The diagonal of the mass matrix is used in the MAC values calculation. It will give more weight to quantities at nodes where the mass is important. The MAC values can also be calculated without this weighting and this is good too.
      Now for this particular warning message, RSTMAC is used after RSPLIT. This splitting of the RST does not split the mass diagonal because, once assembled, there is no way to split it – nodes can be part of multiple components. That is why it gives that warning.

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