My problem is that I have experimental marker data from 8 persons performing a movement with the arm ( I use the MOBL_Arms model). I do not have static marker data from the persons. The persons perform a crank turn movement. I have the data for the crank angle per time. So I selected a specific cran...

Ok, thank you very much for your answer James. I already saw the webinar and it helped me to understand more about scaling. But again when do I need to achieve the recommended values: maximum marker error lower than 2cm and RMS lower than 1cm? Directly after scaling the generic model or after marker...

Hi, I performed scaling with the MoBL-ARM model. I have the data of 8 persons from experiments. I proceeded in the following way: 1. I set markers in the MoBL-ARM model as they were set during the experiments. 2. I performed scaling thereby using measurement based scaling. I reduced the maximal erro...

Hi, I performed Scaling with the MoBL_ARMS model using marker data from experiments. I read the page https://simtk-confluence.stanford.edu/display/OpenSim/Getting+Started+with+Scaling which explains results evaluation. It is written that the maximum marker error should be lower than 2cm and the RMS ...

Ok I think that the reason for my failure was that I did not set the markers by myself before scaling. So maybe someone can tell me if the following scaling steps are correct: 1.I load the MOBL ARM model and remove the markers 2.I set new markers at the positions where they are set in my experiments...

Hi, I am using an adapted MoBL ARMS model and try to perform scaling therefore using an experimental marker file. When I perform scaling my markers are not placed correctly. I added the model and the setup file to this post and a picture where my model and the markers are shown after scaling. Does a...

Could somebody explain me the Optimizer convergence criterion? I really tried to understand it but I could not find any writings About it related to OpenSim. I understand that CMC uses an Integrator and this Integrator compares the state values at each time step. But what does the convergence criter...

Hi, If I peform IAA for the Femur during Walking, I get two values for the total acceleration in each direction: total_X and total_Ox. Is it correct that total_X describes the acceleration of the Femur in x-direction in reference to the global coordinate System? Total_Ox on the other side describibe...

Hi, I am currently working on my master Thesis thereby using the OpenSim Software. I weakened m. rectus femoris by modifying the contraints file (activation deficit simulation). Then, I implemented a path spring parallel to m. rectus femoris with different stiffness values and observed the effects o...

Hi, When I perform OpenSim simulations as for example with the CMC tool, how do I know if the output deviations arise from simulation errors (due to inaccuracy) or if they refer to 'real' differences? When I perform CMC with the same input files, the output files will be slightly different due to si...