How to determine ω3 & ω4 values in Transient analysis

Parthiban B
Parthiban B Altair Community Member
edited June 10 in Community Q&A

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In direct transient analysis, how do I determine the appropriate values for ω3 and ω4?

where:

ω3 = Frequency of interest for converting over structural damping into viscous damping

ω4 = Frequency of interest for converting element damping coefficient into viscous damping

What factors should I consider when selecting these frequencies to convert structural damping to viscous damping and element damping coefficients into viscous damping?

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Answers

  • Rajashri_Saha
    Rajashri_Saha
    Altair Employee
    edited June 10

    Hi Parthiban,

    Usually, it is advised to enter same values for w3 & w4.

    You can calculate this as w3=2*Pi*(1st Natural frequency). You can get the 1st natural frequency value from Modal Analysis.

    Thanks

    Rajashri

  • Parthiban B
    Parthiban B Altair Community Member
    edited June 10
    Rajashri Saha_20525 said:

    Hi Parthiban,

    Usually, it is advised to enter same values for w3 & w4.

    You can calculate this as w3=2*Pi*(1st Natural frequency). You can get the 1st natural frequency value from Modal Analysis.

    Thanks

    Rajashri

    Thank you. That's Helpfull

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