|Cornell Ranger, 2011-2012
4-legged bipedal robot
Ranger walks non-stop 65.2 km (40.5) mile ultra-Marathon on May 1-2, 2011
By improving the controls algorithm and the electronics,
Ranger's energy use was reduced by 43% from July 2010 when
Ranger walked 14.3 miles. Before that the record was held
by Boston Dynamics' BigDog,
an all-terrain gas-powered quadruped, which trotted
12.8 miles without
refueling. In contrast, in February 2011, in
Osaka Japan at the first robot marathon, the robots
refreshed their batteries. On this 40.5 mile walk Ranger
recharged or even touched by a person.
Ranger was steered with a model-plane remote control
that controlled a small motor which twisted the inner pair
The coordination of the walking was by the 6 onboard
Unlike many bipedal robots which have large flat feet,
Ranger has small
rounded feet and cannot stand upright. At each step it
catches itself in a controlled manner. The challenge met
here is to
have a robot robust enough to take 186,076 steps while
only using 5
cents worth of electricity.
Pictures: (Pictures with thumbnails and captions)
(Zipped collection, 171MB)
(click title below for youtube streaming video)
Note: This video is basically about a robot walking in circles for over 30 hours, all through the night. The video starts with a practice at a cancer fundraiser. Part way through you can hear Ranger play the Cornell theme song ("High above Cayuga's waters..."), which it did every kilometer. At the end you see it coming to an abrupt stop when the batteries died.
May 2011 Walk Statistics:
NSF Robust Intelligence; and some supplemental undergraduate
support from Cornell's College of Engineering.
Thanks also to the following companies, for free samples and product discounts:
Keil Software Inc., MicroMo Electronics, CadSoft Computer, Freescale Semiconductor, Maxim Integrated Products, Inc., Infineon Technologies, Analog Devices, Inc., GMW Associates, Tyco Electronics, Molex Inc.