How does radioss calculate the moment on a RigidBody ?

Aurelien Heinrich_21878
Aurelien Heinrich_21878 Altair Community Member
edited July 2023 in Community Q&A

Hi ! 

I'm a PHd student in biomechanics and I'm working with radioss. 

I'm trying to understand how radioss calculates the moment on a rigid body. I used the following options on the rigid body definition : 

/RBODY/2
RBODY_V6                                                                                            
   2742540         0                                              2425                   3          
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|   

These options are basics for a rigid body.

Also I extract (TH file) the Fx, Fz and My moment. 

When I see the result with hyper graph (moment vs time) the values of the moment depend on where the main node is (wich is understandable because the moment depends on where it is measured). I will call the first simulation s1 (with a certain main node coordinates) and the second simulation s2 (with another main node coordinates). 

What is not normal is that when I try to use the displacment fomula to see if I find the same moment in s2 than in s1 it does not match it. I used the 2019 version of radioss.

So it maid me ask how radioss calculate the moment on rigid body ? 

If you need any other informations I will give it to you ! 

Thanks in advance ! 

 

Kind regards,

 

Aurélien.

                                                            
                    

 

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