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Hi guys!

I'm working with a cinematic model (how you can see in the attachments) and I'm interested to extract the actuators' force.

Runned the analysis, MotionView showed me some warnings and I don't know if those warnings may compromise the analysis.

Moreover I'd like to know if constraints are inserted correctly.

I want to specify that when I ask the output (actuators' forces) to motion solve, I obtain some forces which aren't equivalent to those that they should really be.

Thank you in advance,

 

Best Regards. 

BRACCIO.png

WARNINGS.png

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Hi,

 

Those warnings are redundancies. MotionSolve automatically adjusts these redundancies but sometimes this may affect the results. So it would be better if you check the joints and remove the redundancies in your model. 

 

7 minutes ago, FRAIUC said:

I want to specify that when I ask the output (actuators' forces) to motion solve, I obtain some forces which aren't equivalent to those that they should really be.

Thank you in advance,

Can you explain please?

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Hi Prakash,

how can I check the joints and remove the redundant constraints?

Anyway...actuators' forces may be around 100kN, but with this model (maybe because of redundancies) I obtained forces of about 300-400N, much lower from those expected.

 

 

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You need to remove redundancies as much as you can. Joints IDs will be printed in log file with redundancies.

 

If possible share the entire .mdl file which gives wrong/unexpected force output. This could be due to modelling issues 

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i can give you the .mdl file, but to see the results you have to import the h3d file 13 times and divide every component (because I have 13 different components).

 

 

 

 

 

 

 

 

 

 

Edited by Prakash Pagadala
Deleted after saving to local machine.

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As you can see in the attachment, I've 36 excessive constraints...

All the bodies can rotate around x-axis, but they can't translate along x, y, and z axis.

I don't know how to solve this problem...

 

best regards

DOF.PNG

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Hi @FRAIUC

 

I think the problem is with the motion. Instead of applying motion on the joint can you apply motion using markers?

 

You can change the constrain types to remove redundancies, for example. 

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