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.

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

 

 

 

 

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

Altair Forum User said:

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.