via Gizmag
A robotics group at the University of Pennsylvania (UPenn) has taught a six-legged crawling robot to jump, giving it remarkable acrobatic capabilities.
Most land-dwelling animals with skeletons (exo or endo) have the ability to jump. It is of particular importance to survival, as running primarily consists of a long series of jumps. Without the ability to jump, a robot’s freedom to move around is limited, something that is particularly true of smaller robots for which even relatively narrow trenches or low walls can prove too much of an obstacle. A robotics group at the University of Pennsylvania (UPenn) has taught a six-legged crawling robot to jump, giving it remarkable acrobatic capabilities.
There are a number of different approaches to get robots jumping, such as the Sandia hopper and the Sand Flea, which rely on a secondary mechanism that can be called upon when their primary means of locomotion is found lacking. Others, like the grasshopper-inspired andwater strider-inspired microbots, have taken the biomimicry route, while Harvard’s explosively driven hopper takes another approach again.
WIth their X-RHex Lite (XRL) robot, the UPenn robotics group devised yet another technique that gives the crawling robot the ability to not only cross gaps with a single jump, but also climb cliffs using single or sequential jumps, or leap a wide gap by taking a running start.
The XRL weighs 6.7 kg (14.8 lb), and has a body that stands about 20 cm (8 in) high and is 51 cm (20 in) long. The robot has six legs shaped into half circles, which are made of fiberglass with rubber blocks on the outside to provide grip on slippery surfaces. The springiness of the legs allows them to store energy from an earlier maneuver, a capability that greatly increases the XRL’s ability to jump and run.
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