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Robot12
Posts: 7
Registered: ‎07-07-2011

Coordinate Systems used in Autodesk Robot Structural Analysis

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07-08-2012 07:47 AM

What is the difference between the local bar coordinate system and the global bar coordinate system ?

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Artur.Kosakowski
Posts: 4,261
Registered: ‎12-17-2010

Re: Coordinate Systems used in Autodesk Robot Structural Analysis

07-09-2012 12:07 AM in reply to: Robot12

The local is determined by the position of the bar in the 3D space (X along a bar) and its rotation about its own X axis (Y and Z).

 

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Artur Kosakowski
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Robot12
Posts: 7
Registered: ‎07-07-2011

Re: Coordinate Systems used in Autodesk Robot Structural Analysis

07-09-2012 07:29 AM in reply to: Artur.Kosakowski

I am analyzing a building using a 3D frame. Would the displacement experienced by each node used in the frame be in the local coordinate system or in the global coordinate system ?

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Artur.Kosakowski
Posts: 4,261
Registered: ‎12-17-2010

Re: Coordinate Systems used in Autodesk Robot Structural Analysis

07-09-2012 11:38 PM in reply to: Robot12

In the global coordinate system but deflections of bars in the local ones.

 

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Artur Kosakowski
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Robot12
Posts: 7
Registered: ‎07-07-2011

Re: Coordinate Systems used in Autodesk Robot Structural Analysis

07-10-2012 07:15 AM in reply to: Artur.Kosakowski

In your answer you mention bars. Would the displacement of the nodes used in the 3D frame be in the global coordinate system and the deflection of the nodes used in the frame be in the local coordinate system ?

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Artur.Kosakowski
Posts: 4,261
Registered: ‎12-17-2010

Re: Coordinate Systems used in Autodesk Robot Structural Analysis

07-10-2012 07:39 AM in reply to: Robot12

The deflection does not refer to a node; you can only see a displacement of a node regardless of an object it belongs to. 

See also http://forums.autodesk.com/t5/Autodesk-Robot-Structural/RESULTS-DISPLACEMENT-vs-DEFLECTION-Definitio...



Artur Kosakowski
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Robot12
Posts: 7
Registered: ‎07-07-2011

Re: Coordinate Systems used in Autodesk Robot Structural Analysis

07-12-2012 02:23 AM in reply to: Artur.Kosakowski

Would the values of RX, RY and RZ that appear in the displacement results table be in the global coordinate system ?

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Artur.Kosakowski
Posts: 4,261
Registered: ‎12-17-2010

Re: Coordinate Systems used in Autodesk Robot Structural Analysis

07-12-2012 02:58 AM in reply to: Robot12

Correct.



Artur Kosakowski
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