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Structural Dynamics

Structural Dynamics

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  3. Why effective mass does not match total modal mass for a cyclic symmetric model?

Why effective mass does not match total modal mass for a cyclic symmetric model?

Tagged: 2019 R2, mechanical, Modal/Harmonic Response, structural-dynamics, structural-mechanics
    • March 17, 2023 at 9:00 am
      FAQFAQ
      Participant

      We can’t use the same guidelines about effective mass ratio for cyclic modal as we would with non-cyclic models. The effective mass won’t match for cases other than Harmonic Index=0. As per help document: For cyclic symmetric models, the participation factors are only provided for HI=0 and 1, and these values are multiplied by sqrt(N) and sqrt(N/2) to match a full 360 deg model. This is described In Section 4.1.7, please see section below: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v194/ans_cycsym/advcycmodalans.html

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