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Modal Analysis

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

Hi everyone, 

 

While Performing modal analysis, I Gave RHO(Density) value in 7.8 x 10^-6(Kg/mm3) for steel material, I got some Modal frequency.



But, If same given in tone/mm3 ( 7.8 x 10^-9) I got some other frequency. Yeah it is obvious that natural frequency is a function of mass matrix but I am confused which to use?

image

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

    My Elastic modulus value is 200000 MPa (200 GPa)

    User: "Rajashri_Saha"
    Rajashri_Saha
    Altair Employee
    Accepted Answer
    Updated by Rajashri_Saha

    Hi Parthiban,

    As you are using E=200000MPA, then you can go for density as 7.8e-9 ton/mm3.

    You can refer the below consistent unit system.

    image

    As you can see for 7.8e-6 density value, E value should be 210GPA or 0.21mN/mm2.

    Hope this answers your query.

    Thanks

    Rajashri

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

    Hi Parthiban,

    As you are using E=200000MPA, then you can go for density as 7.8e-9 ton/mm3.

    You can refer the below consistent unit system.

    image

    As you can see for 7.8e-6 density value, E value should be 210GPA or 0.21mN/mm2.

    Hope this answers your query.

    Thanks

    Rajashri

    Thanks Rajashri, 

    User: "Rajashri_Saha"
    Rajashri_Saha
    Altair Employee
    Updated by Rajashri_Saha

    Thanks Rajashri, 

    Hi Parthiban,

    You can mark the queries as resolved where you got the correct answers.

    You can look into the previous queries and mark them as resolved too.

    That will be helpful for us.

    Thanks

    Rajashri

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