Hi Nick,

Thanks for your reply. But I'm not sure how to conduct a two-level optimization. Could you please give me some tips?

Thanks,
Chonghui

Hi all, I would like to ask two questions about body mass optimization in Moco. 1. I wish to get the maximum weight of a barbell that a human model can lift. Is the following code correct? param = MocoParameter('barbell_mass', '/bodyset/barbell', 'mass', MocoBounds(1,500)); problem.addParameter(para...

Hi Simon,

Thanks! I have done it.

Wish your question would be answered soon.

Changhui

Hi Pasha, Thanks for your detailed reply. Your examples make me better understand the difference. OpenSim::Constraint will add a constraint force, so it may affect the dynamics of the multibody system? If so, I think that we should choose OpenSim::Constraint or OpenSim::MocoPathConstraint carefully ...

Hi everyone, I am a newcomer to the optimal control theory and the amazing tool of OpenSim Moco. I find there are two class of OpenSim::MocoPathConstraint and OpenSim::Constraint which can add constraints to a problem. The difference between them confuse me. There is a constraint named WeldConstrain...

Hi Simon,

An interesting research! I want to ask a question that how did you get the cost function value when its weighting was zero? When I use Moco, the output cost function value is zero when its weighting is zero.

Chonghui

Hi everyone, I an new to OpenSim and I know that OpenSim is a software to analyze musculoskeletal dynamics, such as joint torques, joint reactions. There are another way to do the similar thing (e.g. finite element method). So, what is the advantage of OpenSim? How can OpenSim be applied to the indu...

Hi Nick,

Could you tell me how to use this kind of customized actuator in Moco? It is not in the main library and the GUI could not recognize it.

Thanks,
San

Hi Nick,

I found the results from joint reaction force calculation were not the same as that from contact forces calculation. You said the former is a rough approximation of the latter. I wonder the reason why they are different.

Thanks ,
San

Hi Simon and Aaron, The resulting values(wJ= weight value * the true obj. value) are truncated and rounded to only 6 decimal, which you can see from the solution file. If you only use MocoMarkerFinalGoal with a small weight, the truncation and round error would be significant. When you calculate J t...