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I am doing research on buying a GRF plate. I am capturing human gait with motion capture system and I also want to know the external forces from the ground to perform inverse dynamics later. I want to ask if anyone has an experience with GRF equipment and how to accurately get data and import it in OpenSim. Can you suggest me some tested GRFs?

Hi Jim,

What type of human motions do you expect to capture with your plate? Running, walking, posture work, stair assent, etc...

I can only speak from my experience, but Kislter and AMTI plates are the standard. Sizing, models, etc... depends on how much money you have/want to spend, and what demands you anticipate your plate will experience. Ex: AMTI are pure mechanical gauges so if there is substantial heat change in your lab you could see some variability in signal. Kistler are piezo and may outperform in this area, but if you do posture work or long period on the plate you can expect signal drift.

Also you might want to think if you need a degree of portability in your plate. If not, go big and heavy, harder to bust

Hope that is useful,

David

Thanks for your advice. My application is human gait (normal walk). I have seen some products from Kistler and AMTI. Have you ever heard of Bertec? Do you actually know something about price range for a single plate?

Jim

Actually we speaked with the companies and it's over 18000$. I think is way too much.

Hi Jim,

I would post your question in biomch-l thread forum;
http://biomch-l.isbweb.org/forums/2-General-Discussion

The community there may be able to give you some prices you would expect.

Personally, $18,000 for a forceplate does not sound unreasonable.

cheers,
-james

Thanks. For a simple plate is over 18000$, just reaction force and without direction. If you want something more you can get over 80000$, just for one piece.

Anyone has information about price range of force plates?

This sounds like a good question for the biomech-l forum. I would suggest searching through their history. Im certain that its been asked and answered there.

Cheers,
-j