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george27

Point mass moment of inertia

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Very simple question: how can I assign moments of inertia to a point mass (CONM2)? I've done it before but can't seem to find the "path" to it anymore (which panel/ pull down menu)! Thanks

check out the "crash-2000: front impact bumper model" step 3 from the tutorials, it will help :)

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Thank you very much for the reply. I can't try this out until next week, but I'm pretty sure my point mass didn't have a card assigned to it... At any rate when I right clicked and tried to "edit card" it said there was no card. I know it's possible to define the inertia through the menu anyway, but I can't remember how!

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Check which template you currently have loaded or the element type assigned to your element. For NASTRAN, you want CONM2 element type, then when you card preview, should be able to add the inertia terms to the element.

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Hi Sai,

You can define the added mass using admas from 1-D panel and then connect all the nodes of the body using /RBODY

Please edit the /RBODY card and use the slider to find the ICOG field and also enter inertia and mass.

ICoG= 1 will add the mass and inertia to the master node.

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Hi,

I am using block 130 format and have used admas at the CG which is connected to the structure through a rbe 3 element to the structure. Now I want to add Moment of inertia for the mass by keeping the rbe 3 same and not using rbody as I think it will provide stiffness to the structure whereas rbe 3 does not. Is this correct?

Is there any way to provide MOI in such case. As it is available in optistruct by using combination of rbe 3 and conm2 element and then editing the conm2 card.

 

Kindly let me know for the same.

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