One Giant Step for Humanoids

An anonymous reader writes "There are a few robots that do amazing things. Honda's Asimo can walk backward and climb stairs. Sega's idog can dance to music. A tougher nut to crack has been making robots walk like humans. Today, scientists introduce three humanoid striders at the annual AAAS meeting. Unlike other robots that have to power every move, these three save energy by letting gravity do a lot of the work. Like humans, they pick up their feet and just let 'em drop. Engineers say they'll inform the next generations of humanoids and also improve design of robotic prostheses for people. And hey, why not send them to Mars to look for those microbes?"

Comments

sites

[r84x]

Here are the homepages for the biped labs of the three universities represented in the article.

Delft

Cornell

MIT

Prosthetics

[BWJones]

Robotic or semi-robotic prosthesis are going to be more and more in demand because ironically of advances in battlefield armor. Current flak jackets (body armor) and helmets are protecting the vital bits of our soldiers, but often limbs (and necks) are sites of damage from explosions and firearms. Many of these soldiers are undergoing amputations either in Iraq or more commonly in Landstuhl, Germany and coming home with prosthetics of varying sophistication.

There are a couple of interesting recent additions to the Internet that cover these issues. One is an article by Steve Silberman in Wired and the other very interesting site is Stuart Hughes blog. Stuart is a world news producer with the BBC who unfortunately stepped on a landmine covering the Iraq war and now writes fairly frequently about "stumpy" and his prosthetic leg.

Re:Muscles, perhaps?

[Anonymous Coward]

Actually, what you say *seems* intuitively right but is proved not-quite-correct by research in passive-dynamics. The energy required to make precisely controlled steps (i.e., muscularly-actuated) is much greater than the energy humans (or any other legged creature, for that matter) expend on walking. Bipedal walking for animals of our size is possible only because humans have evolved adaptive, energy-saving strategies for bipedal motion (for instance, the long tendons and ligaments of our legs are used as passive energy stores).

However, this is not to say that human walking is not a complex coordination of many muscular systems. It's just that steps are not as controlled as we'd like to think. This is by design, so that we can adapt quickly to unpredictable surfaces. Robots that try to be very controlled in walking usually are very slow because they must do many dynamic calculations that humans simply don't do because of the way our legs are designed.