Hello !

Is there a model for Opensim 4.0 ? Because I got some trouble when I use the MatLab code. This is because I use OpenSim 4.0 and the API in this version.

So do I need the version 3.0 to run this model or there is another possibility ?

Thanks.

Hello, I use 'Static Optimization' in order to find joint reaction forces. I was wondering from where does the value of min activation come (a_min = 0.01) ? Is there a sensitiv analysis for this term ? In a forward-dynamic model a_min is needed to avoid some singularities. In an inverse kinematics d...

So in the StaticOptimization, according to this : Note that for static optimizationf(F0m,lm,vm) computes the active fiber force along the tendon assuming an inextensible tendon and does not include contribution from muscles' parallel elastic element. . The tendon is consider inextensible and the par...

Fiber length is a state Fiber length is a state if we derive the activation term (a) from an Activation Dynamics. Once found 'a', we can then compute the fiber length (lm) (see https://nmbl.stanford.edu/publications/pdf/Millard2013.pdf . In my case I'm trying to use a Static Opimization instead of ...

Thanks a lot for the answer. You are right, I was considering the wrong line. But still, I don't understand how the length of the Tendon or of the Fiber-muscle are calculated. If I consider this line: https://github.com/opensim-org/opensim-core/blob/3a0505ef5ecdada39c786588a0549c208127e2d1/OpenSim/A...

Hello, I try to understand the Muscle structure used in OpenSim. After some research I found that the Thelen 2003 Muscle Model is used. In this model, the length of the Tendon or of the Fiber-muscle need to be known. My problem is to understand how this two values are calculated ? I did some researc...