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Reference CID and Analysis CID

ron.kunz
Dear all,
I am trying to understand an example model with a bearing.
The two nodes which are used to constrain the bearing give for the Node Location Information:
Reference CID = Global Rectangular
Analysis CID = 4 Rectangular
 
All other nodes are referring also to Global Rectangular CID for the Analysis CID.
I would like to know what this means 4 Rectangular?
The RBE2s which are connected to these points have no reference to other CID so I assume they take the global CID.
 
In the BDF-file there are some CORD2R defined:
CORD2R* 4                              0.             0.
*       0.            1.              0.            0.
*      0.              0.            -1.
*
CORD2R* 5                              0.             0.
*       0.            -1.             0.            0.
*      0.              0.            1.
*
CORD2R* 6                              0.             0.
*       0.            1.              0.            0.
*      0.              0.            -1.
*
CORD2R* 7                              0.             0.
*       0.            -1.             0.            0.
*      0.              0.            1.
*
CORD2R* 12                            -160.81759643554368.5
*      -226.72961425781-160.81759643554691.1295443819 -556.83722631104
*      -168.57967172422698.56095064975695.8543142001753
 
I don`t see a special CID.
Can you explain the 4 Rectangular?
Thanks
 
 
 
 
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  • 0
    Ok thanks and in addition I found this on the different coordinate systems.
    Does that mean, one can check with the analysis CID how your nodes are behaving?
    Just a control check? Because the reference CID is the physical CID?
     
    The Reference Coordinate System is the coordinate system in which the location of nodes are defined.
     
    • In Patran, this known as the Reference Coordinate System.
    • In MSC Nastran, this is Field 3 or CP in the GRID bulk data entry.
     
    The Analysis Coordinate System is the coordinate system in which the displacements of the nodes are observed. In addition to observed displacements, the following may be observed: degrees-of freedom, constraints, and solution vectors are defined at the grid point. The Analysis Coordinate System is also referred to as the Displacement Coordinate System.
     
    • In Patran, this is known as the Analysis Coordinate System.
    • In MSC Nastran, this is Field 7 or CD in the GRID bulk data entry.
    • Note: Once you perform an analysis and have displacements, these oserved results may be transformed to different coordinate systems.
     
Reply
  • 0
    Ok thanks and in addition I found this on the different coordinate systems.
    Does that mean, one can check with the analysis CID how your nodes are behaving?
    Just a control check? Because the reference CID is the physical CID?
     
    The Reference Coordinate System is the coordinate system in which the location of nodes are defined.
     
    • In Patran, this known as the Reference Coordinate System.
    • In MSC Nastran, this is Field 3 or CP in the GRID bulk data entry.
     
    The Analysis Coordinate System is the coordinate system in which the displacements of the nodes are observed. In addition to observed displacements, the following may be observed: degrees-of freedom, constraints, and solution vectors are defined at the grid point. The Analysis Coordinate System is also referred to as the Displacement Coordinate System.
     
    • In Patran, this is known as the Analysis Coordinate System.
    • In MSC Nastran, this is Field 7 or CD in the GRID bulk data entry.
    • Note: Once you perform an analysis and have displacements, these oserved results may be transformed to different coordinate systems.
     
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