Structural Dynamics

Structural Dynamics

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  3. In the case of rigid body motion, why are all the participation factors equal to zero after the sixth mode ?

In the case of rigid body motion, why are all the participation factors equal to zero after the sixth mode ?

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    • June 6, 2022 at 9:58 am
      FAQFAQ
      Participant

      The modal participation factor is a measure of how strongly each mode shape is present in the free vibration of a structure. If the structure is unconstrained, the first six modes (the rigid body modes) dominate the response in the respective directions. Hence, the first six participation factors are non-zero, and all the following participation factors will be small (near zero) in comparison.

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