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Sai Vignesh

Modal effective mass

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Kindly find the attached out file

 

In effective modal mass i am getting my total mass  in translation direction

 

Why not in rotation of X direction?

 

Is the unit different when it comes to translation and rotation ?

 

Thanks for your help

 

 

image.png

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3 hours ago, Rahul R said:

The Modal Effective mass in the Trans X, Y and Z directions and Rotational X, Y and Z direction have the same units.

Thanks for reply but in total mass in rotational directions why it is not equal to total mass? in translation i get my total mass equal to system mass but in rotational it shows 250kg which is more than my over all system mass

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I see you have requested only first two modes, which might be missing critical data and under predicting response of the system.I request you to run with ND as 25 modes in EIGRL card and then evaluate the response in out file.

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Why you are expecting translation and rotation to be same.The Modal Effective Mass is a measure of how much mass is associated with each mode.

Please try effmass on other model to understand its output.

 

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