Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: Oddity on July 13, 2010, 05:28:07 PM

Title: Hydraulic cylinder or electric actuator
Post by: Oddity on July 13, 2010, 05:28:07 PM
Which would be easier to use to help lift the lower leg part of an exoskeletal leg? And are there any suggestions of the exact cylinder or actuator to use, I was thinking of something about the size of a tibia.
Title: Re: Hydraulic cylinder or electric actuator
Post by: Soeren on July 14, 2010, 09:52:59 PM
Hi,

Which would be easier to use to help lift the lower leg part of an exoskeletal leg? And are there any suggestions of the exact cylinder or actuator to use, I was thinking of something about the size of a tibia.
Go with electricity (and lithium batteries). If you have to drag a complete hydraulics system around, the pros of an exo' sort of vanishes.
To get even slightly useable suggestions, you need to present a bit more data (how much force, speed, load etc. is needed).

You might wanna look at this page (http://web.mit.edu/newsoffice/2007/exoskeleton-0919.html) and you can find several research papers on the subject (like starting here (http://www.google.com/search?num=100&hl=en&safe=off&client=firefox-a&hs=vNv&rls=org.mozilla%3Ada%3Aofficial&q=exoskeleton+leg+research&aq=f&aqi=&aql=&oq=&gs_rfai=) or perhaps try PubMed).
Title: Re: Hydraulic cylinder or electric actuator
Post by: MechHead on July 16, 2010, 11:29:10 PM
I agree with Soeren that you shouldn't use hydraulics.  Using electric actuators should work, but another pneumatics would be another thing to consider.