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

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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 ?

Tagged: mechanical, modal-analysis, Modal/Harmonic Response, structural-dynamics, structural-mechanics

- June 5, 2023 at 7:05 am
  
  FAQ
  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) fully describe the free vibration of the structure. Hence, the first six participation factors are non-zero, and all the following participation factors are equal to zero.

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Structural Dynamics

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

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