external actuator for muscle weakness

Provide easy-to-use, extensible software for modeling, simulating, controlling, and analyzing the neuromusculoskeletal system.
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Park SangJun
Posts: 21
Joined: Wed Jan 10, 2024 11:00 pm

external actuator for muscle weakness

Post by Park SangJun » Wed Sep 18, 2024 10:52 pm

Hi
I want to use muscle weakness model to know how much force should be supplemented by external actuator to assist weakened muscle.
However, I don't know how to implement external actuator in opensim.
As far as I know, in opensim, you can't control the torque value of motor with respect to time, so I'm thinking of using passive actuator.
My idea is as follows,
1. Implement actuator CAD
2. Manually adjust actuator passive stiffness
3. Select optimal stiffness value
Is there a problem with my idea?
Please answer!

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Carmichael Ong
Posts: 393
Joined: Fri Feb 24, 2012 11:50 am

Re: external actuator for muscle weakness

Post by Carmichael Ong » Mon Oct 07, 2024 11:54 am

You can use a PrescribedController to control an Actuator over time. One example of its use is here: https://github.com/opensim-org/opensim- ... del.py#L99

The other idea of using a passive device would also work. Depending on your needs, you could add a passive component to model the forces it applies to the system without creating a CAD model.

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