How structure mass for modal analysis is calculated in Robot Structural Analysis

Autodesk Support

Oct 8, 2023

Products and versions covered

Issue:

How structure mass for modal analysis is calculated in Robot Structural Analysis.

Solution:

While modal analysis calculation Robot Structural Analysis takes into account the following structural masses:

  • Structure self mass

Structure self mass is taken into account while Disregard density option is inactive in Modal analysis parameters dialog.
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  • Added masses

Added masses - nodes and Added masses-bars are defined from Loads >Load definition<Self weight and mass tab.
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  • Masses converted from load cases.

Masses converted from load cases are defined from Analysis >Analysis types >Load to mass conversion tab.
Masses converted as Global mass or Dynamic mass are taken into account for all dynamic/modal load cases.
Masses converted for selected dynamic load cases, are taken into account, in those selected load cases only.

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 Added load masses and converted load masses are visible in Added masses table. To open Added mass table go to View>Tables. Check on Added masses table and OK.
 


 

Products:

Robot Structural Analysis Products;

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