MDO Measure connection reaction forces expressed in which cssy?

[David_Hale_00]

Hi I am measuring some reaction forces in the XY domain, but i am confused which CSSY CREOis referencing?

Is it the COG CSSY for the rigid body? Or the default CSSY for the rigid body assy?

[Catalina]

Hi @David_Hale_00 

Thank you for your question. 

Your post appears well documented but has not yet received any response. I am replying to raise awareness. Hopefully, another community member will be able to help.

Also, feel free to add any additional information you think might be relevant.

Best regards,

[Lewis_Maina_M]

In Creo Simulate and Mechanism, coordinate systems can be a bit tricky because they shift depending on whether you are looking at inputs or result measures.

When you are measuring reaction forces in the XY domain, here is how Creo typically handles the Coordinate System (CSYS):

By default, reaction forces are reported in the World Coordinate System (WCS), which is the default assembly coordinate system, unless you have explicitly defined a local CSYS for that specific measure.

Creo does not default reaction force results to the COG of a rigid body.

• Mass Properties are calculated at the COG.

• Inertial Forces are often calculated through the COG.

• Reaction Forces (at supports or joints) are reported at the point of constraint, relative to the WCS.

 Example: If your assembly is oriented such that the "Global Y" is vertical, but your rigid body is rotated, a "Default" XY measure will follow the assembly's floor/walls, not the tilted body's axes.

Hope this is clear for you