Why do I get incorrect results when I apply inertia loads in the use pass?
The Advanced Analysis Techniques Guide Section 8.1.1.2 has this note:
"If a mass matrix is generated, it is recommended that degree of freedom
constraints be applied in the use pass at the master DOF (defined in the generation pass).
This ensures that all mass is accounted for in the substructure."
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In your model, in which you have specified master degrees of freedom only at the interface between two parts of a cantilever, it is clearly much more accurate to apply the acceleration in the generation pass so that the load vector considers all the internal dof of the superelement. A note has been added to the documentation to clarify this. [Ref: Defect 28447] |
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