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Orphan Nodes

Shivani Tiwari

Goodmorning All

Preprocessor/Post Processor - Hypermesh/ HYPERVIEW

Solver - msc nastran

I am doing normal mode analysis of exhaust system that is constrained in all DOF. I have cleared all preserved node. But still in HYPERVIEW when I am seeing the output orphan Nodes are coming.

As I have already told that my system is constrained still rigid modes are coming.

Can anyone help me to resolve orphan Nodes error.

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Mario_21478

Hello,

Normally Hypermesh converts directional vectors into orientation nodes. This is not a problem.
In Hyperview these then appear as 'Orphan Nodes'. You can just turn it off.

Orphan Nodes have nothing to do with rigid modes. Normally these should be 'auto-constraint' in any case.

Icon 'Entity Attributes'-> select 'Orphan-Grids-> Display: Off

Best Regards,

Mario

image.png.a52b048f3a182914eca4cb0ac5f62cc9.png

Shivani Tiwari

Sir if I off this orphan node, Is rigid body removes from my analysis?

Shivani Tiwari

Sir if I off this orphan node, Is rigid body removes from my analysis?

Mario_21478

Hello,

see my comment above.

Try to use AUTOSPC=YES.

Best Regards,

Mario

Shivani Tiwari

Ok sir

Shivani Tiwari

Hello,

Normally Hypermesh converts directional vectors into orientation nodes. This is not a problem.
In Hyperview these then appear as 'Orphan Nodes'. You can just turn it off.

Orphan Nodes have nothing to do with rigid modes. Normally these should be 'auto-constraint' in any case.

Icon 'Entity Attributes'-> select 'Orphan-Grids-> Display: Off

Best Regards,

Mario

<?xml version="1.0" encoding="UTF-8"?>

Sir I tried with autospec yes but still facing the same problem. When I open the model in hyperview (animation), i found that the constraints at each hanger (dof 1-6) are not working.

But when I see it in hypermesh DOFs are correctly defined.