elbow flexion moment exoskeleton

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dani mendez
Posts: 24
Joined: Tue Aug 07, 2018 1:40 am

elbow flexion moment exoskeleton

Post by dani mendez » Tue Apr 21, 2020 10:01 am

Good afternoon, I have tried to connect a spring directly to humerus and ulna, and on the other hand I have connected the same spring to two plates attached to the arm. When comparing the elbow flexion moment, I do not understand why there is such a difference between the two cases.
Does anyone know what happens?
Thank youImage
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Ventanas
OpenSim 4.0
GUI
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Ratna Sambhav
Posts: 42
Joined: Sat Jan 12, 2019 10:16 am

Re: elbow flexion moment exoskeleton

Post by Ratna Sambhav » Wed Apr 22, 2020 2:30 am

Hello Deni Mendez,
The higher moment in case of exoskeleton is probably due to the increased mass. You should check the mass of the two plates you attached to the arm and forearm.
I don't see any other reason.
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dani mendez
Posts: 24
Joined: Tue Aug 07, 2018 1:40 am

Re: elbow flexion moment exoskeleton

Post by dani mendez » Thu Apr 23, 2020 1:52 am

Good morning, thanks for your reply Ratna.
The mass of the two plates is 0 Kg, I did so precisely so that it did not affect. So I see so strange difference
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Thomas Uchida
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Joined: Wed May 16, 2012 11:40 am

Re: elbow flexion moment exoskeleton

Post by Thomas Uchida » Thu Apr 23, 2020 7:10 am

The moment generated by the spring is the product of its force and moment arm. You could plot the spring's force, length, and moment arm to investigate the discrepancy further.
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