Raibert One-Leg Hoppers (Planar and 3D)

Carnegie Mellon University Leg Laboratory, later MIT Leg Lab (USA) · 1980

Not for saleDARPA-funded research machines (planar hopper 1980–1982, 3D hopper 1983–1984). The 3D hopper is now displayed at the MIT Museum.
Not for sale (research)Not programmableResearchDynamic balancePneumatic legHistoric
Not for saleShipping: Not for sale. Not available. Historic research machines, with the 3D hopper on display at the MIT Museum.
Remote control: Not possible. Historic laboratory machines.

Overview

Marc Raibert's pogo-stick robots showed that dynamic balance could come from a surprisingly simple controller split into three parts, one for hopping height, one for forward speed through foot placement and one for body attitude. The planar hopper ran around a 2.5 m tether boom in 1980–1982, and the 3D hopper then balanced and ran freely on the lab floor at up to 2.2 m/s in 1983–1984. The same approach carried over to the Leg Lab's bipeds and quadrupeds after Raibert moved the lab to MIT, and later to Boston Dynamics machines such as BigDog. Modern hoppers such as Disney's LEAP and SALTO still use Raibert-style control.

Specifications

CategoryJumpers & hoppers · Jumping & hopping robots
Released1980
CountryUSA
AvailabilityNot for sale (research)
ProgrammabilityNo programmability
Best forProfessionals & labs
Vision sensorsNo vision sensors
ActuatorsMixed
AudioNo audio
Compute typeLaptop / PC as the brain
Remote controlNot programmable
SizePlanar hopper about 8.5 kg. 3D hopper 1.10 m tall, 17.3 kg
LocomotionOne telescoping pneumatic leg that acts as spring and thrust actuator. The planar hopper's hip was pneumatic, the 3D hopper uses a hydraulic 2-axis gimbal hip
ComputeOff-board minicomputer in a nearby room, linked by an umbilical cable
CameraNone
SensorsLeg length and hip angle potentiometers, foot contact and body attitude sensing. The planar hopper also used sensors on its tether-boom pivot
RuntimeContinuous while on the umbilical (compressed air, hydraulic and electrical power supplied off-board)
SpeedPlanar hopper up to 1.2 m/s, 3D hopper up to 2.2 m/s
SDKNone

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