Hi all, I am reviewing the tutorial of static optimization https://simtk-confluence.stanford.edu:8443/display/OpenSim/Working+with+Static+Optimization . In this tutorial, Study 2 compares the output muscle activations and residual forces from unfiltered, filtered, and RRA motions. The unfiltered mot...

Hi Thomas,

Thanks a lot, it works.

Simon

Hi everyone,

When I load models in OpenSim 4.4, the third and subsequent models will overlap with the first one. There is no such matter in the previous version. How to solve this?

Thanks,
Simon

Hi all, For multi-objective optimization, can we observe the whole Pareto front in Moco? I wanna graphically explain the reason why J1 and J2 could not predict a continuous postural change during w1 and w2 vary. My thought is to show all the Pareto optimum solutions and objective function lines (w1*...

Hi Nicos Haralabidis, I am going to solve similar optimal control problems with Matlab fmincon. Could you please show me how to include the OpenSim model's system dynamics into the problem? I tried to write equations of motion by myself and added them to fmincon, but I feel hard and troublesome to d...

Hi Chonghui, I set the solution as an initial guess of a new MocoStudy, and set the maximum numbers of iteration to be zero. The code is following: solver.set_optim_max_iterations(0); This method was proposed by Nick in a previous thread but I cannot find it out. It outputs the objective function va...

One of the differences of torque-driven models from muscle-driven models is that the torque limit is regarded as a constant, or we say static joint strength, instead of a real dynamic joint strength. To include muscle properties into torque-driven models, we can construct a dynamic joint strength mo...

Thank you Ton and Ross :D . I understand that this is not a problem of my model/setup, then I just want to explore why the discontinuities exist in posture prediction. According to the advice of Ton, I drew the resulting J1 and J2 in Figure(a). Also, I plotted some representative lines of w1*J1+w2*J...

Hi all, I selected two goals to predict the initial posture of the box lifting motion in Moco. I'm sorry that I have to keep these goals a secret, because they are key innovations in my unpublished paper. Here I just nominate them as J1 and J2. When I minimize J1, I could get a squatting posture as ...

Hi all, I expect that my skeletal model could include the lumbopelvic coordination. As the attached figures show, the orientation of the torso is T, the orientation of the sacrum is beta, the knee angle is K. The coordination expression is : beta = -17.5 - 0.12T + 0.23K + 0.0012TK + 0.5T^2 - 0.00075...