Joint reaction analysis with static optimization result

[Chiho Ng]

Hello all,

I have got some unresonable results when I executed joint reaction analysis (the analyse tool) with static optimization result. The knee forces got so large that it couldn't be possible to reach. At first I wondered if it had something to do with my model or data, then I do the same calculation with Gait2392. I found that if I used CMC result, joint reaction forces were resonable, while static optimization results would lead to bad values.

Have anyone met this problem? Do you know why it would happen and how to fix it?

Thank you so much for your attention!

Chiho Ng

[Chiho Ng]

BTW,

I found that if I saved the states from GUI after implmenting static optimization, the muscle stations (activation and fibre_length) in the state file are all the same, which should have been the same as the station in the activation file originally. Why would this discrepancy appear?

Thank you again! Hope to get the answers!

Chiho