MadSci Network: Biophysics

Subject: How to get a 1000lb robot 10 feet into the air

Date: Thu Jan 5 08:25:47 2006
Posted by No name entered.
Grade level: undergrad School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Biophysics
ID: 1136474747.Bp

If I were designing a robot that had a 400lb torso (waist and up) and 300lb 
(each) legs( because of the hydraulic system in the foreleg of each) and I 
wanted it to jump 10 feet into the air (of course not land, there is no 
suspension!!!) :) how much force (in psi I guess) should the plantar flexor 
(artificial gastrocnemius) produce. And how much force (in psi I guess) should 
the knee extendor (Artificial Quadriceps) produce. The said robot's legs are 
based on our own anatomically. I think I remember reading a fact sheet about 
olympic athletes that said a good 2 legged jump was made up of 40% Quadriceps, 
20% Gastrocnemius, X% Hamstrings, etc. This may seem like a vague question 
that does not address the complexity of the problem so I will clarify. I want 
to know what amount of force would be needed from the Gastrocnemius and 
Quadricep to lift a person that weighed 1000 lbs. 400 lb torso, no arms, 600 
lb (300 each) legs.  About "How Many psi should be produced by hydraulic pumps 
in each leg (regardless of orientation as the psi force will be translated 
into pulling artificial tendons) for a two legged jump that takes the 1000lbs 
frame 10 feet into the air?" The only other question would be what equations 
would be most useful for answering this question. 

Re: How to get a 1000lb robot 10 feet into the air

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