Please refer this video and let me know why my skeleton moves slightly up and down during simulation? I have done the mass and COM adjustments also.
https://youtu.be/HvTy0cGNiPk
RRA simulation distortion
Re: RRA simulation distortion
Do you have two separate ground reaction forces, applying one to each foot?
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ajinkya patil
- Posts: 33
- Joined: Wed Jun 10, 2015 11:09 pm
Re: RRA simulation distortion
yes sir, I have 2 seperate GRFS.
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Aaron Godfrey
- Posts: 55
- Joined: Tue Feb 16, 2016 12:34 pm
Re: RRA simulation distortion
I've had odd movements in the y axis myself, but I haven't had GRFs taken into account at any point - just a model (that has an associated motion) that is scaled with the original's motion applied to it. For me, the movement is more of a compression than a drifting as in OP's.
What other possibilities are there?
What other possibilities are there?
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ajinkya patil
- Posts: 33
- Joined: Wed Jun 10, 2015 11:09 pm
Re: RRA simulation distortion
James Dunne, Can you tell us the reason behind this?
Re: RRA simulation distortion
The reason is simple; all of the forces, masses are not in equilibrium. 'Why' can be due to a number of things.
Maybe you didn't apply your external forces correctly, maybe the masses are not correct, maybe the residual actuators are not being applied appropriately.
Have you run Inverse Dynamics and assessed if the joint torques and residuals are what you expect?
I would suggest working through this example. In Part II of the example, you iterate on a Model in RRA to reduce the 'bouncing' and achieve a 'good' simulation.
-j
Maybe you didn't apply your external forces correctly, maybe the masses are not correct, maybe the residual actuators are not being applied appropriately.
Have you run Inverse Dynamics and assessed if the joint torques and residuals are what you expect?
I would suggest working through this example. In Part II of the example, you iterate on a Model in RRA to reduce the 'bouncing' and achieve a 'good' simulation.
-j