Human ancestors have been walking around on two legs for a few million years. We’d imagine that by now we’ve figured out a pretty efficient mechanism for getting around. Unconvinced, however, researchers at Carnegie Mellon University have developed an “exo”-boot that reduces the metabolic rate of walking by seven percent. Best of all, the mechanism requires no additional source of active power input besides the human legs that are wearing them.
Upon close inspection, the boots reduce the overall applied torque at the angle joint at a critical point where the heel begins to lift off the ground. Energy in, energy out. The spring ratchets to a loaded position as the user plants their foot. This ratchet releases, re-engaging the stored spring force as the user brings their heel back off the ground. A seven percent reduction in metabolic rate may not sound like much, but, according to the paper, it’s the equivalent of about four kilograms less weight in your backpack on that next hiking trip.
As for what specific costs are being reduced to lower the body’s metabolic rate, the researchers still aren’t completely sure. An off-the-cuff look at the joints and moments from a mechanics perspective won’t give us a sure-fire answer since the energy consumption processes of muscles are, well, complicated. In fact, by varying spring stiffness in their design, they discovered that springs that were either too stiff or too loose had no effect on the metabolic rate. Yes, they’ve certainly stumbled on a sweet spot in terms of well-mixed circumstances, but the answer behind why the new robot-legs work so smoothly will be a study for the future.
If you haven’t jumped into the world of exo-skeleton building, let [James Hobson] be your guide into pushing our bounds with homebrew mechanical advantages. Now let’s keep our fingers crossed for some long-fall boots.
via [The Washington Post]
As some of you may or may not know, I’m interested in everything exoskeleton related. I’ve been messing around with my own designs for the past year or so, and just this past weekend, tested out the latest lower body design. There are a lot of boring (and some would say safe) ways to test this. But that’s no fun. For my test I used the lower-half of the exoskeleton to pick up a Mini Cooper.
You might remember my original upper-body design which was something I threw together in my garage as a proof of concept. It worked well for what it was, and surprisingly, took the internet by storm — amassing over a million views in a single week for a video of me curling 170lbs in my backyard. The fire had started — I knew I had to make something better. And that was the beginning of my quest to build a full-body powered exoskeleton.
The biggest problem with the original was a lack of back support — it didn’t matter how much weight I could lift, it was still my feeble human skeleton taking the weight. So it was time to go back to the drawing board, and start the design from the ground up. Continue reading “Homemade Exoskeleton Lifts Mini Cooper with Ease”
Nearly a million people in the US suffer from CP, a neurological disorder that causes spastic motion in the limbs. One of the biggest quality of life factors for CP sufferers is the ability to use their arms, and that means an expensive and clunky orthotic around their elbow. [Matthew] has a better idea: why not make a soft orthotic?
This is not [Matthew]’s first project with soft robotics. He’s the lead scientist at Super Releaser, the company responsible for the completely soft robotic Glaucus atlanticus and other soft pneumatic robots.
This soft, flexible orthotic exoskeleton is designed for sufferers of chronic movement disorders. Traditional orthotics are expensive, difficult to move, and uncomfortable, but by designing this orthotic to be just as strong but a little more forgiving, these devices minimize most of the problems.
The Neucuff is constructed out of extremely simple materials – just some neoprene, a velcro, and a CO2 cartridge. The problem with bringing this to market, as with all medical devices, is FDA requirements and certifications. That makes the Hackaday Prize an excellent opportunity for [Matthew] and the rest of Super Releaser, as well as anyone else trying to navigate regulatory requirements in order to change the world.
As hilariously outrageous as Pacific Rim was, it was still an awesome concept. Giant robot battle suits, duking it out with the aliens. Well, it looks as if it wasn’t quite as far-fetched as we first imagined. Maker [Danny Benedettelli] just released a video of his very own Lego exoskeleton suit that when worn can be used to control a desktop size Cyclops robot. You might remember [Danny] as the author of The Lego Mindstorms EV3 Library,
The Cyclops robot (also his design) was originally built four years ago using Lego Mindstorms NXT system with an Android phone running a custom app. Cyclops has been upgraded a bit for this demonstration. Now it communicates over Bluetooth with an Arduino to [Danny’s] telemetry suit.
Relatively speaking, the system is pretty simple. The Lego exoskeleton has potentiometers on each joint, which map to a degree of freedom for the robot. When one potentiometer spins, the associated robot joint mimics it. Simple, right?
Continue reading “Lego Exoskeleton Controls Pacific Rim Robot”
Many of us have gone on a stationary romp through some virtual or augmented scape with one of the few headsets out in the wild today. While the experience of viewing a convincing figment of reality is an exciting sensation in itself, [Mark Lee] and [Kevin Wang] are figuring out how to tie other senses into the mix.
The duo from Cornell University have built a mechanical exoskeleton that responds to light with haptic feedback. This means the wearer can touch the sphere of light around a source as if it were a solid object. Photo resistors are mounted like antenna to the tip of each finger, which they filed down around the edges to receive a more diffused amount of light. When the wearer of the apparatus moves their hand towards a light source, the sensors trigger servo motors mounted on the back of the hand to actuate and retract a series of 3D printed tendons which arch upward and connect to the individual fingers of the wearer. This way as the resistors receive varying amounts of light, they can react independently to simulate physical contours.
One of the goals of the project was to produce a working proof of concept with no more than 100 dollars worth of materials, which [Mark] and [Kevin] achieve with some cash to spare. Their list of parts can be found on their blog along with some more details on the project.
Continue reading “Touching Light with Haptic Feedback”
Here’s another very interesting project to come out of the 4 Minute Mile challenge — pneumatically boosted legs.
It’s another project by [Jason Kerestes] in cooperation with DARPA. We saw his jet pack a few days ago, but this one looks like it has a bit more promise. It is again a backpack mounted system, but instead of a few jet turbines, it has a pneumatic cylinders which move your legs for you.
Just watching it it’s hard to believe it makes it easier to run, but apparently after being tested at the Army Research Laboratories last year it demonstrated a whopping 10% reduction in metabolic cost for subjects running at high speeds. It can actually augment the human running gait cycle, and is the only device the US Army has confirmed can do so.
He is already hard at work designing version 2.0 which is lighter and more flexible. There’s a bunch of test videos after the break so stick around to see it in action.
Continue reading “AirLegs Augment Your Cardio by 10%”
We’re not just a bunch of monkeys with typewriters here at Hackaday; we don our hacker hat whenever our schedules allow. Or, in the case of Hackaday’s own [James Hobson]—aka [The Hacksmith]—he dons this slick exoskeleton prototype instead,turning himself into a superhero. Inspired by the exoskeleton from the film Elysium, this project puts [James] one step closer to the greater goal of creating an Iron Man-style suit.
For now, though, the exoskeleton is impressive enough on its own. The build is a combination of custom-cut perforated steel tubing and pneumatic cylinders, attached to a back braces of sorts. In the demonstration video, [James] stares down 170 pounds of cinder block affixed to a barbell, and although he’s no lightweight, you can tell immediately from his reaction how much assistance the exoskeleton provides as [James] curls the makeshift weights over and over. And that’s only at half pressure. [James] thinks he could break the 300 pound mark of lifting if he didn’t break his legs first.
There’s plenty of behind-the-scenes footage of the build process to be had, so make sure you stick around after the jump for a sizable helping of videos, and check out [The Hacksmith’s] website for more of his projects.
Continue reading “Homemade Superhero: [James’] DIY Exoskeleton”