CMC positional inaccuracy
Posted: Tue May 19, 2020 7:07 am
Hi all,
Problem 1 : I have a hand model with measured small inertial properties (1E-7). I have a problem running CMC during finger flexion. it gives very large position errors. Multiplying the properties by 1000 solves the problem. Why so much positional inaccuracy is coming into picture while solving with low intertial properties problem ? How can I solve this ?
Problem 2: I tried to run the CMC on same hand model above with same very low inertial properties but this time with having passive forces as coordinateLimitForces for the joints. but if I have it for all three joints MCP ,PIP and DIP it doesn't proceed to the next step. having one passive force at MCP make the process very slow. What is the reason behind it ? How can I solve this
I am wondering if it intrinsic to Opensim hat cannot handle small inertial.
P.s: static optimisation works fine.
Thanks in advance,
Problem 1 : I have a hand model with measured small inertial properties (1E-7). I have a problem running CMC during finger flexion. it gives very large position errors. Multiplying the properties by 1000 solves the problem. Why so much positional inaccuracy is coming into picture while solving with low intertial properties problem ? How can I solve this ?
Problem 2: I tried to run the CMC on same hand model above with same very low inertial properties but this time with having passive forces as coordinateLimitForces for the joints. but if I have it for all three joints MCP ,PIP and DIP it doesn't proceed to the next step. having one passive force at MCP make the process very slow. What is the reason behind it ? How can I solve this
I am wondering if it intrinsic to Opensim hat cannot handle small inertial.
P.s: static optimisation works fine.
Thanks in advance,