Muscle recruitment solver problem

Main Forum
1

Hi

I tried to use the model to perform badminton serve

I used Vicon MOCAP system to capture the motion…

and input C3D file to drive the model

Now… kinematics analysis can be done.

But I add the simple muscle into the model and

tried to do inverse dynamics analysis…

It can not work…

And I got a message:

“Muscle recruitment solver : solver aborted due to singular KKT matrix”

I don’t know what’s wrong and how to solve it…

Please give me some information

Thank you

Best Regards

Kunag-Wei Lin
National Taiwan Sport University

2

Hi Kunag-Wei Lin,

Once you have the kinematics running, the biggest problem is probably solved!
The Error message

“Muscle recruitment solver : solver aborted due to singular KKT matrix”

typically indicates that some degrees of freedom are not carried. The reason could be missing muscles for a certain motion, missing reactions in a joint or to ground.
What model are you using? did you change something to the Body?

Amir

3

Thank you Amir…

I solved the problem…

I forgot to use the “Hook”

Now it works…

Kuang-Wei Lin

4