# george27

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Newbie
1. ## Point mass moment of inertia

Thanks, I'll try it out!
2. ## Point mass moment of inertia

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!
3. ## Point mass moment of inertia

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
4. ## 1D versus 3D elements

Thank you, I'll take a look at the manual.
5. ## 1D versus 3D elements

Thanks a lot for the input! So, if I understood correctly, when you assign a cross-section to a 1d component the solver uses one of the beam theories to calculate the required response quantities? Would that mean that the number of elements used for the 1D mesh is completely irrelevant as you would get the same result in any case? In general, it would make sense to use 1D if the model is close to the ideal case, if not 3D would be more accurate?
6. ## 1D versus 3D elements

When analysing beams, how significant is the difference in accuracy between results obtained using 3D elements, and ones obtained using 1D elements (i.e. meshing the beam as a line and assigning a cross section to it)? When would it make sense to make the effort of using 3D elements?
7. ## Applying gravitational forces?

Thanks a lot for replying, I realized later that it was already working, I was sort of waiting for the load to be shown in the model...
8. ## Applying gravitational forces?

I'm having a bit of a problem with the following (sorry, I'm rather new to HyperMesh..): How do I apply gravitational forces to a model, i.e. how do I tell HyperMesh to use the weight of the components as a force? I created a load collector and assigned GRAV as card image, adding the acceleration value, but don't know how to effectively "activate" the force (I'm assuming it should somehow be displayed)... I would be very grateful for help!
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