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How to determine ω3 & ω4 values in Transient analysis

User: "Parthiban B"
Altair Community Member
Updated by Parthiban B

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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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    User: "Rajashri_Saha"
    Altair Employee
    Updated by Rajashri_Saha

    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

    User: "Parthiban B"
    Altair Community Member
    OP
    Updated by Parthiban B

    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