HI,
I am trying to analyse forces on the human muscles when an external force is applied on human segments to lift up thereby releasing the ground contact. Please help me in identifying the suitable classes and constraints to run this simulation.
Hi
Do you have experimental data, like motion and such? You could start with one of the models in the AMMR like the free posture example or one of the mocap examples, depending on the data you have. In the free posture example, you can modify the constraint between the pelvis and the environment to add your own motion of the pelvis.
You can apply the external force through AnyForce or AnyForce3D. You can also use AnyFunInterpol to interpolate measured force data.
Hope this helps!
Best regards,
Dave
Noted, thank you, I dont have any experimental data or mocap data. In that case, can I use COM driver to move the human body up and analyse the muscle activity. I also have another doubt wrt using mannequin drivers, does these default drivers to be switched off while performing this study and do I need to constrain lower limb joints too??
Yes, the Centre of Mass driver can be a good option to move the human body. You should work with the overdeterminate solver, where you also add mannequin drivers as soft drivers, and the CoM driver as a hard driver. I recommend you have weak mannequin drivers for the lower limb also. The mannequin drivers can give you some control over the posture of the model.
You would probably need to think a little bit over the forces. You have the lifting force on one hand, but on the other hand the aerodynamic force is also important in this simulation.
Best regards,
Dave
As you rightly pointed out that aerodynamic force will come into play, but keeping this force negligible might give some insight into human internal forces.
Thanks for your guidance, will msg here if any issue arises.
You are right, and of course, it depends so much on the speed. You are always welcome to post your questions here 
Best regards,
Dave