Judgement Day Update: Cheetah Robot Unleashed!

MIT-Cheetah-05-640x366There have been lots of high-speed bio-inspired robots in recent years, as exemplified by Boston Dynamics WildCat. But MIT’s Cheetah robot, which made its big debut earlier this month, is in a class by itself. In addition to being able to run at impressive speeds, bound, and jump over obstacles, this particular biomimetic robot is also being battery-and-motor driven rather than by a gasoline engine and hydraulics, and can function untethered (i.e. not connected to a power source).

While gasoline-powered robots are still very much bio-inspired, they are dependent on sheer power to try and match the force and speed of their flesh-and-blood counterparts. They’re also pretty noisy, as the demonstration of the WildCat certainly showed (video below). MIT’s Cheetah takes the alternate route of applying less power but doing so more efficiently, more closely mimicking the musculoskeletal system of a living creature.

mit-cheetahThis is not only a reversal on contemporary robotics, but a break from history. Historically, to make a robot run faster, engineers made the legs move faster. The alternative is to keep the same kind of frequency, but to push down harder at the ground with each step. As MIT’s Sangbae Kim explained:

Our robot can be silent and as efficient as animals. The only things you hear are the feet hitting the ground… Many sprinters, like Usain Bolt, don’t cycle their legs really fast. They actually increase their stride length by pushing downward harder and increasing their ground force, so they can fly more while keeping the same frequency.

MIT’s Cheetah uses much the same approach as a sprinter, combining custom-designed high-torque-density electric motors made at MIT with amplifiers that control the motors (also a custom MIT job). These two technologies, combined with a bio-inspired leg, allow the Cheetah to apply exactly the right amount of force to successfully bound across the ground and navigate obstacles without falling over.

MIT-cheetah_jumpWhen it wants to jump over an obstacle, it simply pushes down harder; and as you can see from the video below, the results speak for themselves. For now, the Cheetah can run untethered at around 16 km/h (10 mph) across grass, and hurdle over obstacles up to 33 centimeters high. The Cheetah currently bounds – a fairly simple gait where the front and rear legs move almost in unison – but galloping, where all four legs move asymmetrically, is the ultimate goal.

With a new gait, and a little byte surgery to the control algorithms, MIT hopes that the current Cheetah can hit speeds of up to 48 km/h (30 mph), which would make it the fastest untethered quadruped robot in the world. While this is still a good deal slower than the real thing  – real cheetah’s can run up to 60 km/h (37 mph) – it will certainly constitute another big step for biomimetics and robotics.

Be sure to check out the video of the Cheetah’s test, and see how it differs from the Boston Dynamics/DARPA’s WildCat’s tests from October of last year:


The Future is Here: The DARPA/BD Wildcat!

BD_atlasrobotThe robotics company of Boston Dynamics has been doing some pretty impressive things with robots lately. Just last year, they unveiled the Cheetah, the robotics company set a new land speed record with their four-footed robot named Cheetah. As part of DARPA’s Maximum Mobility and Manipulation program, the robotic feline demonstrated the ability to run at a speed of 45.06 km/h (28 mph).

And in July of this year, they impressed and frightened the world again with the unveiling of their ATLAS robot – a anthropomorphic machine. This robot took part in the DARPA Robotics Challenge program. capable of walking across multiple terrains, and demonstrated its ability to walk across multiple types of terrain, use tools, and survey its environment with a series of head-mounted sensors.

Atlas_robotAnd now, they’ve unveiled an entirely new breed of robot, one that is capable of running fast on any kind of terrain. It’s known as the WildCat, a four-legged machine that builds on the world of the Legged Squad Support System (LS3) that seeks to create a robot that can support military units in the field, carrying their heavy equipment and supplies over rugged terrain and be operated by remote.

So far, not much is known about the robot’s full capabilities and or when it is expected to be delivered. However, in a video that was released in early October, Boston Dynamics showed the most recent field test of the robot to give people a taste of what it looks like in action. In the video, the robot demonstrated a top speed of about 25 km/h (16 mph) on flat terrain using both bounding and galloping gaits.

Cheetah-robotFollowing in the footsteps of its four-legged and two-legged progeny, the WildCat represents a coming era of biomimetic machinery that seeks to accomplish impressive physical feats by imitating biology. Whereas the Atlas is designed to be capable of doing anything the human form can – traversing difficult terrain, surveying and inspecting, and using complex tools – the Cheetah, LS3, and WildCat draw their inspiration from nature’s best hunters and speed runners.

Just think of it: a race of machines that can climb rocky outcroppings with the sure-footedness of a mountain goat, run as fast as a cheetah, stalk like a lion, bound like an antelope, and swing like a monkey. When it comes right down to it, the human form is inferior in most, if not all, of these respects to our mammalian brethren. Far better that we imitate them instead of ourselves when seeking to create the perfect helpers.

LS3-AlphaDog6reducedIn the end, it demonstrates that anthropomorphism isn’t the only source of drive when it comes to developing scary and potential doomsday-bating robots! And in the meantime, be sure to enjoy these videos of these various impressive, scary, and very cool robots in action:




universetoday.com, bostondynamics.com