compute moment arm in MATLAB?
Posted: Sat Jun 18, 2011 5:26 pm
Hello All
I am modeling an index finger and thumb in OpenSim; add muscles into the index finger, downloaded from Upper Extremity Model https://simtk.org/home/up-ext-model.
I know how to calculate moment arm, r = derivative muscle tendon length / derivative joint angle where, muscle tendon length = tendon length + fiber length * cos (pennation angle). In addition, I have realized the only way to change this moment arm is to change muscle points or to combine them by fixed, via and moving points (wrapping surface as well).
To decide moment arms to be fitted to literatures, I just keep repeating same works: change muscle points, plot them, and compare them with literatures over and over again. That’s so ~ boring.
Therefore, I just want to compute moment arms in Matlab and find out best points via optimization methods. Please, let me know if any one tired this work or knew how to do. Your comment would be greatly appreciated. Thanks in advance.
I am modeling an index finger and thumb in OpenSim; add muscles into the index finger, downloaded from Upper Extremity Model https://simtk.org/home/up-ext-model.
I know how to calculate moment arm, r = derivative muscle tendon length / derivative joint angle where, muscle tendon length = tendon length + fiber length * cos (pennation angle). In addition, I have realized the only way to change this moment arm is to change muscle points or to combine them by fixed, via and moving points (wrapping surface as well).
To decide moment arms to be fitted to literatures, I just keep repeating same works: change muscle points, plot them, and compare them with literatures over and over again. That’s so ~ boring.
Therefore, I just want to compute moment arms in Matlab and find out best points via optimization methods. Please, let me know if any one tired this work or knew how to do. Your comment would be greatly appreciated. Thanks in advance.