Hi, In order to run FD we provide CMC muscle controls and states. However can anyone please explain to me what does the output controls file exactly give after FD. I expected both input and output controls to be the same, but that is not the case. There is a drastic change between the two. Also is t...

Hi, I am simulating walking on a gait model using opensim-python api. Now I calculate instantaneous torques depending on pose at that time and then using those torques to get muscle activations to drive the model to next pose after integration. My question is whether instantaneous torque be calculat...

Thank you again for your help Mohammadreza. So why is my foot sinking in the ground during forward dynamics? I have torque calculated at every instant from the ID solver which is then used to calculate muscle activations to drive the model to a new pose. But the model gets distorted. Will I have to ...

Hi All, I am implementing static optimization to calculate muscle activations using ID torques during normal walking. I just wanted to clear one thing. The ID torques are calculated included the external loads (GRF). So when I calculate muscle activations do I need to implement the external loads ag...

Hi, I am using the Rajagopal model in a Python script and want to simulate walking. I have static optimization modelled for the muscles, however for pelvis and lumbar coordinates I need to have reserve actuators. So I have included coordinate actuators. Now I do not know what controls to provide to ...

Thank you for replying Mohammadreza. Yes I too was thinking on the same lines. However, I am trying to find a way to append reserve actuators in python api. I am not using the opensim toolboxes directly therefore I am not sure how I can pass reserves actuators and get my code to fetch the amount of ...

Hi, The pipeline I am following is that I calculate ID torque for each coordinate in the Rajagopal full body model and use the torques to calculate muscle excitations. For this I have two models. One (ID model) that has no muscles and is only use to calculate the ID torques. I have been able to succ...

Ok got it. Thank you again, Mohammadreza.

Regards,
Shivangi

Thank you very much Mohammadreza for your detailed answer. I was able to calculate the ID torques using the order you listed :D . Just one question, is it mandatory to set the time explicitly to model.setTime(time ) to make ID pull GRF at the required instances or does the ID solver take care of it ...

Thank you Mohammadreza, for your reply and suggestions. I have a question regarding your second point. Is multibody tree order different than coordinate set order? If yes, can you point me to a documentation link or example which can help me look up the multibody tree order. So far I have tried assi...