Mass distribution using NASTRAN

[BillBarclift]

I have a NASTRAN model of an airlane that has been modified to match a
desired mass distribution. This has been accomplished using CONM2's
and RBE3's. The resulting mass distribution (along the x-axis)
appears quite good. I did this by applying a 1g load.

The problem I am having is I want to slice up the model into n
discrete items (longitudinally, along the x-axis, for the body) and
end up with n items, each containing: Weight, Xcg, Ycg, Zcg, Ioxx,
Ioyy, Iozz. How do I do this?

[Jeff Finlayson]

Post by BillBarclift
I have a NASTRAN model of an airlane that has been modified to match a
desired mass distribution. This has been accomplished using CONM2's
and RBE3's. The resulting mass distribution (along the x-axis)
appears quite good. I did this by applying a 1g load.
The problem I am having is I want to slice up the model into n
discrete items (longitudinally, along the x-axis, for the body) and
end up with n items, each containing: Weight, Xcg, Ycg, Zcg, Ioxx,
Ioyy, Iozz. How do I do this?

You'll have to break the model up into pieces to match the
mass properties data you have. Make separate models for each
pieces.

Do a Nastran run (any type) on each with the following parameter.

PARAM GRDPNT 0

This will give you the mass properties that you seek.

If you are using a pre/post processor for Nastran, it should be
able to give mass properties data as well. That's probably the
easier way to do it.


- CJF.

[k***@gmail.com]

Is there a way to get the mass distribution into a plot form or just the data output from NASTRAN?

Thank you.