Residuals Reduction Algorithm (RRA)

Provide easy-to-use, extensible software for modeling, simulating, controlling, and analyzing the neuromusculoskeletal system.
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Jens van der Wees
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Residuals Reduction Algorithm (RRA)

Post by Jens van der Wees » Mon Jun 24, 2024 1:21 am

Hi! there i am again, with another question on RRA and it's corresponding actuators file. I have a very small question, so i hope it is simple for you to answer as well. Does it matter if the optimal forces in the actuators file are high, in order to perform RRA with it?

Kind regards,
Jens van der Wees

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

Re: Residuals Reduction Algorithm (RRA)

Post by Carmichael Ong » Sun Jul 07, 2024 4:01 pm

The choices for optimal force values is important for RRA, and it's possible that picking larger or smaller values (for all actuators) can change the final simulation output (due to numerical and optimization differences).

To get a sense of how to tweak these values, it could be helpful to go through the example The Strength of Simulation: Estimating Leg Muscle Forces in Stance and Swing (https://opensimconfluence.atlassian.net ... +and+Swing). In particular, Part II uses RRA.

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