Mode Shapes - Limiting Selection of Shapes

Helpful Questions & Answers

  • Frequently Asked Questions (FAQs)

I need many mode shapes to achieve a sum of 90% effective modal mass. Can I limit the number of mode shapes for generating equivalent loads?

Answer

Yes, you can. Mode shapes with only a small portion of the effective modal mass can be ignored.

You can define this manually or use a filter in the program.

The selection of mode shapes also has a direct effect on the performance. The lower the number of mode shapes, the lower the number of the load cases to be generated.

Keywords

Model shape Mode shape Number of mode shapes

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  • Updated 07/18/2022

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