How to calculate Fm muscle force with known parameters

Hello, I want to use muscle length and speed changes to find muscle force;
I use the muscle length, speed and activation in the inverse dynamics output as the input. The muscle force and output calculated by the muscle force formula in the HILL model are very different. I would like to ask if Fm can be calculated using the formula, if possible. How to calculate Fm.
Thanks and best regards.

Hi @osk

The muscle force is already available as an output in each of the muscles.
All the muscles have a Fm variable in the output right next to the length, speed and activation parameters.

What exactly are you trying to compute?

Best regards,
Bjørn