I found the dissertation and other interesting papers here:

http://nmbl.stanford.edu/publications/index.htm

Is there a reference of a paper where the gait2354 model is extensively described?

Have you managed to simulate your problem correctly?

I'm in general interested if it is possible to use CMC to compute muscle force distributions for motions(or at least with long periods) without ground reaction forces? Anyone?

<t>Hi,<br/> <br/> recently I had the following error during CMC:<br/> <br/> SimTK Exception thrown at InteriorPointOptimizer.cpp:249: Optimizer<br/> failed: Ipopt: Restoration failed (status -2) OPTIMIZATION FAILED...<br/> <br/> Do you know what this "status -2" means or do you have a paper for me, ...

<t>*update:<br/> <br/> sorry, but during my latest test I have found out, that the unreasonable results not only occur between the stance and the swing phase.<br/> <br/> Furthermore I found that it is not possible to start the simulation later than 1.7sec. Could this point to a problem in the CMC re...

<t>Dear Ayman,<br/> <br/> thanks for the response. What you have said may solve my problems, if I do long forward dynamics simulations in time.<br/> <br/> But besides that I have a different problem: my simulations (forward dynamics) become unreasonable and break down at specific parts of the motion...

<t>I am testing the version 1.8.1 with the gait2354 model and the example files. I was wandering if it is possible, to do the cmc computation and the forward dynamics for a whole gait cycle. I have done the CMC for the first 5 seconds. The excitations look fine and reasonable, but when I now start a...

hej,

I am wondering what the actual version of OpenSim is? I only have access to v1.5.5 and can not find any v1.6 or v1.7. Are these unofficial releases?

Thanks
Nicolas

<t>I have a similar (maybe the same) problem. I tried to start a simulation with the gait2354 example files and simply increased the simulation time from 0 to 15s (so that all data is used). Everything works fine until CMC. I can not run the CMC module for those time periods in which two grf occur, ...

<t>Ok, it sounds nice. I have tried to do a forward simulation with the example gait model 2354 and the original setup file. Before that I have done all the steps incl. CMC. Then I modified the initial states file in that way, that I deleted all the data except the first 5 timesteps. Unfortunately t...