Re: (close to) minimizing metabolic cost
Posted: Mon Nov 16, 2020 7:25 am
Hello Nick,
I want to prevent the predictive simulation from finding a local optimum like the picture attached, where the GRF is only in the forefoot.
That is totally unexpected from a gait with weakened plantairflexors.
I checked out the output report as in outputTable = study.analyze(full, outputPaths), includeding in the outputPaths the "potential energy" (outputTable = study.analyze(full, outputPaths)).
The results for variables "/contactHeel_r|potential_energy", "/contactHeel_l|potential_energy", "/contactFront_r|potential_energy" and "/contactFront_l|potential_energy" was zero for all timestamps. A constant zero value.
So, I looked again at my model and noticed the positioning of the contact geometry in the forefoot. After I changed, moving closer to the heel, I got something that looks more correct. This "heel gait" was found in previously published articles.
Hope it is clearer now. The idea is to have more tools (goals in the cost function) to generate a broad range of impairment gait.
Best regards.
Carlos
I want to prevent the predictive simulation from finding a local optimum like the picture attached, where the GRF is only in the forefoot.
That is totally unexpected from a gait with weakened plantairflexors.
I checked out the output report as in outputTable = study.analyze(full, outputPaths), includeding in the outputPaths the "potential energy" (outputTable = study.analyze(full, outputPaths)).
The results for variables "/contactHeel_r|potential_energy", "/contactHeel_l|potential_energy", "/contactFront_r|potential_energy" and "/contactFront_l|potential_energy" was zero for all timestamps. A constant zero value.
So, I looked again at my model and noticed the positioning of the contact geometry in the forefoot. After I changed, moving closer to the heel, I got something that looks more correct. This "heel gait" was found in previously published articles.
Hope it is clearer now. The idea is to have more tools (goals in the cost function) to generate a broad range of impairment gait.
Best regards.
Carlos