Solution for ball grasp

Krishnakumar Sankar · Post by **Krishnakumar Sankar** » Wed Sep 21, 2016 8:51 pm

Hi,
I created a .mot file for ball grasp activity and obtained the net forces and torques of the joint.Now I need to obtain the forces of tendons associated with the motion.Any possible solution would be of great help.

Dimitar Stanev · Post by **Dimitar Stanev** » Thu Sep 22, 2016 12:35 am

You can perform Static Optimization.

http://simtk-confluence.stanford.edu:80 ... timization

Krishnakumar Sankar · Post by **Krishnakumar Sankar** » Thu Sep 22, 2016 12:17 pm

Thanks a lot sir.Now I am able to obtain individual tendon forces.
I have a couple of questions if you could kindly answer

I uploaded the .mot file that I created using analyze tool and through force reporter i got forces exerted by tendons.Through static optimization I got tendon force values by uploading my .mot file I created .Among these two (analyze tool and static optimization) which one I should follow sir.Also I am uploading the motion file i created.In this file data are given in such a way that a finger grasps the ball in the hand.Possible solutions for the above query sir would be of great help.

: Motion.JPG (38.66 KiB) Viewed 420 times

Dimitar Stanev · Post by **Dimitar Stanev** » Thu Sep 22, 2016 11:21 pm

They are identical if your setup is the same. Use Static Optimization.

Krishnakumar Sankar · Post by **Krishnakumar Sankar** » Fri Sep 23, 2016 2:04 am

Thank you sir.It helped a lot.

The force value of EDCM tendon (maximum 39 N ) obtained through static optimization varies largely with the graph generated through plot (close to 300 N) which I did between active fiber force and .mot file which contains the angle.Could you kindly help me out in comprehending this difference.

: Graph.JPG (43.95 KiB) Viewed 376 times

Krishnakumar Sankar · Post by **Krishnakumar Sankar** » Wed Nov 02, 2016 2:02 am

mitkof6 wrote:They are identical if your setup is the same. Use Static Optimization.

Could you mention what you meant by setup here.All I have is motion file that I created.

Also is there any relation to convert muscle excitation voltage to angle ?.

Dimitar Stanev · Post by **Dimitar Stanev** » Wed Nov 02, 2016 2:25 am

You used two tools. If you setup the tools correctly their results should be identical. There are some extra options in the AnalysisTool that you should be careful, e.g. step_interval.

http://simtk-confluence.stanford.edu:80 ... lysis+Tool

Solution for ball grasp

Solution for ball grasp

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