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1 grand force reaction division between 2 legs
Posted: Sun Feb 02, 2020 11:13 am
by yunusrezvani
Hey everybody
Standing with both legs on a force plate gives you a single ground force reaction some where between two soles.
How can I divide this single force to the both legs of my model?
thanks.
Re: 1 grand force reaction division between 2 legs
Posted: Sun Feb 02, 2020 5:02 pm
by tkuchida
The problem is impossible to solve without more information (it's analogous to asking for any two integers that sum to 10). Depending on your research question, you could try assuming that the GRF is evenly split between the two legs if the COP is midway between the feet, 100% applied to a single leg if the COP is below that foot, and linearly interpolate elsewhere. However, you would need to consider this large amount of modelling uncertainty when interpreting your results.
Re: 1 grand force reaction division between 2 legs
Posted: Tue Feb 04, 2020 11:39 am
by yunusrezvani
tkuchida wrote: ↑Sun Feb 02, 2020 5:02 pm
The problem is impossible to solve without more information (it's analogous to asking for any two integers that sum to 10). Depending on your research question, you could try assuming that the GRF is evenly split between the two legs if the COP is midway between the feet, 100% applied to a single leg if the COP is below that foot, and linearly interpolate elsewhere. However, you would need to consider this large amount of modelling uncertainty when interpreting your results.
I do have the .trc file of the subject and a single force plate force
is there a way to exert this single force to both legs properly?