Sharp jumps and fluctuations in the joint torques after inverse dynamics

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Sharmita Dey
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Joined: Wed Jun 20, 2018 11:07 am

Sharp jumps and fluctuations in the joint torques after inverse dynamics

Post by Sharmita Dey » Wed Aug 01, 2018 3:59 am

Hello everybody,

I have tried to model the gait of a healthy subject(mass 56.5 kgs) in an inclined (10 degree up) pathway. Whereas, the kinematics look pretty OK when compared with the literature, the joint moments have sharp fluctuations and jumps at some points.(Attached figures).Please help if any of you have faced the same problem and if there any possible solution to it/or this is normal.

--Sharmita Dey
Attachments
Knee angle r moment.png
Knee angle r moment.png (35.58 KiB) Viewed 195 times
Hip flexion r Moment.png
Hip flexion r Moment.png (31.43 KiB) Viewed 195 times
ankle angle moment.png
ankle angle moment.png (28.69 KiB) Viewed 195 times
Tags:
OpenSim 3.3 and Earlier
GUI
Windows
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User avatar
Sharmita Dey
Posts: 9
Joined: Wed Jun 20, 2018 11:07 am

Re: Sharp jumps and fluctuations in the joint torques after inverse dynamics

Post by Sharmita Dey » Wed Aug 01, 2018 9:17 am

I kind of got better results now.I had missed filtering the forces while creating the .trc files.However, I did the filtering during opensim's inverse kinematics and dynamics( tried 6hz, 4hz, 3hz,12hz) before which resulted in the above curves.
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