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Effective Mass Participation

User: "Karthic_22061"
Altair Community Member
Updated by Karthic_22061

Hi All,

How to output the results for Effective Mass Participation Factor in modal Analysis ?

 

Is it sufficient to look for the first 6 to 10 modes or a couple of hundred Hz (say 500 Hz) ?

 

 

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    User: "Rahul Rajan_21763"
    New Altair Community Member
    Updated by Rahul Rajan_21763

    Use control card PARAM,EFFMAS,YES.

    Modal mass results written to .out file.

    User: "gopal_rathore"
    Altair Community Member
    Updated by gopal_rathore

    Hi All,

    How to output the results for Effective Mass Participation Factor in modal Analysis ?

     

    Is it sufficient to look for the first 6 to 10 modes or a couple of hundred Hz (say 500 Hz) ?

     ï»¿

     

    Hi,

    Selection of modes depend on your area of interest in frequency range , based on these you need to observe the mode shapes and also check the mass participation in that particular mode.

     

    Also try to understand based on your operating condition which mode would be more severe i.e the object has the tendency to have during the operating conditions.

     

    Are you working on a fixture design?

    User: "Karthic_22061"
    Altair Community Member
    OP
    Updated by Karthic_22061

    Thank you @gopal_rathore,

    Not fixture design.

    I came across a term  Effective Mass Participation Factor online.

    User: "Altair Forum User"
    Altair Employee
    Updated by Altair Forum User

    Hi @Karthic

     

    Number of modes and EMPF are interdependent. 

     

    Generally, a mode with higher EMPF is considered significant contributor and a cumulative EMPF more than 80% in any given response direction considered as sufficient. 

    User: "LOKESH KATARI"
    Altair Community Member
    Updated by LOKESH KATARI

    i am trying calculate the EMPF but its not showing anything in the out file?

    help me with this

    Thank you

     

    User: "Rahul Rajan_21763"
    New Altair Community Member
    Updated by Rahul Rajan_21763

    Additionally, you can request under OUTPUT> HGEFFMASS to write out the *.mass,*mass.mvw session files which can be directly loaded in HyperGraph to visualize the bar charts detailing on the effective mass output.

    Please also try output results in punch format and open the .pch file. Files attached for your reference.

    <?xml version="1.0" encoding="UTF-8"?>HGEFFMASS.JPG

    Unable to find an attachment - read this blog

    User: "LOKESH KATARI"
    Altair Community Member
    Updated by LOKESH KATARI

    sir modal effective mass and mass effective are same ?

     

    User: "Rahul Rajan_21763"
    New Altair Community Member
    Updated by Rahul Rajan_21763

    Please refer attached document from help.

    Unable to find an attachment - read this blog