Hello, everyone! I have two questions about marker data. 1.I'd like to get .trc data from motion capture to execute scaling and IK. I use kinect(xbox) and I have only 10 markers. In the opensim model such like gait2354, it use more makers. To get accurate joint angle and simulation result, do I need...

Tom,

Thank you for your reply.

Is it mean that "WeldConstraint" should not use when I simulate SO?
If I'd like to use this, should I use CMC?
I'd like to use "WeldConstraint" if it is possible because I don't have ground reaction force.

Thank you very much.

Hello, Tom. After that, I tried to simulate using "WeldConstraint" to consider ground reaction force. I could weld feet to ground. But when I run SO, this weld model outputs error. If I didn't weld the feet using "weldconstraint", SO could run without problem. So, I think the factor of this error ma...

Dear Ayman, Thank you for your reply. I run ID and I checked the each moment. But I don't know how to decide the maximum generalized force produced by each actuators. Should I add more amount of power of actuator if each torqu are large? I know this is a simple question, but would you give me some i...

Hello, everyone. I'm using OpenSim to simulate muscle activity during sit to stand movement. I run StaticOptimization to examine them and message box said that "The model appears unsuitable for static optimization". I added reserve actuator and I ran StaticOptimization again. But the result did not ...

Hello,everyone! I'd like to investigate the sit to stand motion of many patterns (more than 100 patterns). Difference of each patterns are defined to change its joint angles. I thought about using Opensim to observe the difference in muscle activity between each standing patterns. In the OpenSim, if...

Hi, Dimitar
Thank you for your reply.
I checked muscle's fiber length, but I don't know which data I should compare with.(I can't confirm these are too large,small or OK)
If these are not exactry, do I need to change the mot file?

Hello, everyone. I use OpenSim to examine muscle activity during sit-to-stand movement. I’ve made some STS motion, but result of SO data is too large than I expected. This picture is result of the muscle activity of soleus_r and ercspn_r. I think these values are too large. soleus_r erecspn_r.PNG I ...

Thank you very much,Tom. I'll use the WeldConstraint to weld the feet to the ground. I'm sorry but I can't figure out how to add reaction force from the chair. I know that I can't use WeldConstraint when I simulate sit to stand. Because when people stand, their hip cannot keep in touch with the chai...

Tom, Thanks for your reply. I could weld feet to the ground using Weld Constraints. I'm wondering if I could weld feet to the ground, could ground reaction force be applied to the model? Do I need to add other force to the model? And I'd like to know how to add reaction force from the chair. Now, I'...