In the case of rigid body motion, why are all the participation factors equal to zero after the sixth mode ?
June 5, 2023 at 7:05 amFAQParticipant
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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