Significance of Filter in Static Optimization

[Krishnakumar Sankar]

Hi
I have a list of queries regarding Static optimization in Wrist model for holding objects
1.What is the significance of filter in Static optimization ?.
2.Why do the graph varies before and after filter and which result have to be taken ?.
3.The default filter value is 6 Hz.What if we increase or decrease the value ?.
4.I get the SO result as Static optimization too weak.Increasing the muscle force would eliminate this message ?

[Dimitar Stanev]

Hi,

1) Since SO accepts the kinematics, the filter is applied to the kinematics in order to remove any high frequency artifacts.
2) If you change the input the output would change.
3) If you increase the cut of frequency you will not attenuate frequencies bellow the cut of value.
4) Not necessary, since the muscles interact with the system in a nonlinear and varying manner. Maybe the problem is in the operation region of the given muscles.

Best

[Krishnakumar Sankar]

Thank you.So what would be the solution for the last question?

[Thomas Uchida]

So what would be the solution for the last question?

Please see the "Best Practices and Troubleshooting" section on the "Getting Started with Static Optimization" Confluence page (http://simtk-confluence.stanford.edu:80 ... timization). In particular, see item 1(b) under "Troubleshooting".