Navigation:  Calculation Modules > Analysis > ENERCALC 3D > Ribbons > Create > Generate Loads > Additional Masses

Create > Generate Loads > Additional Masses prompts you with the dialog below.

 

 

 

It allows you to assign additional masses and mass moment of inertia to selected nodes.  The mass can be applied to X, Y and/or Z directions while the mass moment of inertia can be applied to OX, OY and/or OZ directions.  Additional Masses are added to the mass calculated from the load combination for frequency analysis (see the command: Analysis > Frequency Analysis).  Mass moment of inertia values can only be input using the Additional Masses command.

 

The mass unit is a force unit divided by the acceleration of gravity, while the mass moment of inertia has units of mass times length squared.  The acceleration of gravity is taken as 386.09 in/sec^2 or 9.8 m/sec^2.