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I am using Ansys to find the natural frequency of a structure but this has meant that my understanding of vibrations has become unstuck.

When I last studied natural frequencies, it was under free vibration. I formed the impression that one structure can have only one natural frequency which would correspond with a mode shape.

However, in Ansys, for a continous structure, you can find an infinite number of mode shapes (default of 6).

So my question is, how can a structure have so many natural frequencies and therefore corresponding mode shapes.

Confused me!

Any help much appreciated!

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# Natural Frequency and mode shapes

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