SCONE is a software tool for predictive simulations of biomechanical movement. It uses OpenSim for modeling and simulation, and performs optimization using various control strategies, including feed-forward control, proprioceptic feedback control, and bal
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Kohei Kaminishi
- Posts: 5
- Joined: Wed Apr 06, 2016 8:11 am
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by Kohei Kaminishi » Mon Jun 08, 2020 10:18 pm
Hi,
I want to run simulations with different conditions (e.g. run gait simulations while increasing a delay parameter in a control model).
Taking a cue from a past forum post (
viewtopic.php?f=1180&t=11680&sid=931f56 ... 9c153f95ee), I can change leg_load_sonsor_delay parameter of GH2020 gait control model and run a simulation by using the following command.
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sconecmd.exe -e "...\Tutorials\Tutorial 4a - Gait.scone" CmaOptimizer.SimulationObjective.GaitStateController.leg_load_sonsor_delay=0.1
However, the output of the result is always in the same file (e.g. Tutorial 4a - Gait.scone.sto). Is it possible to set this output destination with a command or scone file?
Also, is there a better way to run such simulations with different conditions?
Thanks,
Kohei
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Thomas Geijtenbeek
- Posts: 432
- Joined: Wed Mar 12, 2014 8:08 am
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by Thomas Geijtenbeek » Tue Jun 09, 2020 12:07 am
If you change a scenario parameter, you need to run a new optimization using the
-o switch for the changes to take effect:
Code: Select all
sconecmd.exe -o "...\Tutorials\Tutorial 4a - Gait.scone" CmaOptimizer.SimulationObjective.GaitStateController.leg_load_sonsor_delay=0.1
With a good initialization (using the
init_file parameter), the optimization should not take too long to converge, depending on how large the change is.
Running an optimization is needed because a change in any of the parameters requires some adaptation before the gait becomes stable again.
By the way, there is also a parameter called
sensor_delay_scaling_factor (see
Model) that allows you to change the delays of all reflexes with a specific factor.
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Kohei Kaminishi
- Posts: 5
- Joined: Wed Apr 06, 2016 8:11 am
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by Kohei Kaminishi » Thu Jun 11, 2020 1:23 am
As you say, when simulating a gait, we need to optimize parameters for each condition to make stable motions. The decrease in the time for optimizations with a good initialization seems important. I want to use it effectively.
(The filename of an output .sto file depends on the filename of a .scone file. It was a problem for my iterative process, but I solved it by renaming the .sto file each time.)
Thank you very much.