How is the classification of resonance frequencies determined?

Hi,

I'm using Solidworks (Frequency analysis mode) to define the different modes of vibration of a solid that I drew.

SW determinates 5 modes, with associated frequences.

These modes are numbered (Déplacements1 ... Déplacements5 in French).

My question is : how are they classified? this is certainly not randomly.

Thanks.

Thibault.



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