Coordinate Filtering and Contraction Velocity
Posted: Sat Jun 08, 2013 11:38 am
Hello,
I am simulating a subject jumping and landing on one leg. I have completed though CMC with generally great results. I have two questions.
1. Should I be filtering my Raw 3D data or the Coordinates file? An inverse dynamics comparison shows that the general trends are the same but filtering the coordinates.mot file (instead of Raw 3D) leads to much "smoother" results. I have filtered with the same cutoff frequency.
2. How confident are we with maximum contraction velocity of the muscle? For instance when my subject lands they have a large ankle velocity (much faster than would be possible under normal muscle control). There are large reserves in the ankle aiding the anterior tibialis muscles. This is because these muscles cannot contract fast enough during the simulation (the rotation caused by the GRF is larger than the contraction velocity). When I increase the contraction velocity there are no longer reserves.
Is it Ok to increase contraction velocity of the (decreasing length) muscles on high speed DOFs?
Thank you
RB
I am simulating a subject jumping and landing on one leg. I have completed though CMC with generally great results. I have two questions.
1. Should I be filtering my Raw 3D data or the Coordinates file? An inverse dynamics comparison shows that the general trends are the same but filtering the coordinates.mot file (instead of Raw 3D) leads to much "smoother" results. I have filtered with the same cutoff frequency.
2. How confident are we with maximum contraction velocity of the muscle? For instance when my subject lands they have a large ankle velocity (much faster than would be possible under normal muscle control). There are large reserves in the ankle aiding the anterior tibialis muscles. This is because these muscles cannot contract fast enough during the simulation (the rotation caused by the GRF is larger than the contraction velocity). When I increase the contraction velocity there are no longer reserves.
Is it Ok to increase contraction velocity of the (decreasing length) muscles on high speed DOFs?
Thank you
RB