Hi, everyone I create a gait model with 6 DOF (3 rotations and 3 translations) of knee joint for simulate gait cycle. When I use this model for simulation, I have a hard time to setting the RRA setting files. I firstly add the code similar to the model2354 example as below: for "RRA_actuator.xml" fi...

Hi, Jin
the newest version of OpenSim 2.4 has already include the code for OpenSim to realize ligaments, so if you use version 2.4, I think you don't need to add the ligament plugin since this ligament plugin is only for the old version
Hope this help you

Hi, Ajay First, thanks for your reply which helps me a lot. As you mentioned, I did define the properties of ligament in the model (such as Resting length, beginning point and end point, force_length curve and PCSA force). The reason why I added some codes for ligaments in the CMC actuators file jus...

Hi, Ayman I change the "Ligament" instead of "ligament" which works and the "objectligament is not recognized " in OpenSim message disappeared. But I still confused about how to implement ligament force in my model. I would like to use my model to simulate gait and I defined the ACL/PCL/MCL/LCL in t...

Thank you, Ayman
I will try that and let you know the results

Hang

Hi, All I am trying to build an OpenSim model with knee ligaments to simulate gait and everything goes well in "Scale-IK-ID-RRA" steps. When I ran CMC step, I tried to defined how the ligament works as a force instead of actuator, so I used the function "applyforce" based on the CustomForce Class Re...

Hi, all I met some questions when I tried to learn the Custom force class (https://simtk.org/api_docs/opensim/api_docs20b/) I am confused about the different between "applyForce" which said "Apply a force to a particular body which only apply a force, not a torque, which is equivalent to applying th...

Hi, Ayman Thanks for your reply. I knew that if a model which include only muscle actuators (like model2392),the answer should be identical no matter exclude ALL, Muscles, or Actuators. So, I tested the ID Results for two different situations using model2392 one like below: <forces_to_exclude> Muscl...

Hi, everyone I have a question about ID setting file in Version 2.4 I noticed that there was a function <forces_to_exclude> in the ID setting file which said "List of forces by individual or grouping name (e.g. All, actuators,muscles, ...) to be excluded when computing model dynamics" I used the mod...

Thanks for your help