The December 2022 issue of IEEE Spectrum is here!

Close bar

Festo's Newest Robot Is a Hopping Bionic Kangaroo

The German robotics company unveils its most ambitious bioinspired robot yet

3 min read
Festo's Newest Robot Is a Hopping Bionic Kangaroo
Photo: Festo

Every year, Festo comes up with innovative and fantastical new robot designs as part of its "Bionic Learning Network," which seeks to use "principles from nature to provide inspiration for technical applications." In practice, this means developing all kinds of spectacular robotic animals, including this absolutely amazingflying seagull.

For the last few years, Festo has been secretly working in their sprawling German laboratory lair on their most ambitious bioinspired robot yet: an unstoppable (we assume) hopping robotic kangaroo.

BionicKangaroo is able to realistically emulate the jumping behavior of real kangaroos, which means that it can efficiently recover energy from one jump to help it make another jump. Without this capability, kangaroos (real ones) would get very very tired very very quickly, but by using their tendons like elastic springs, the animals can bound at high speeds efficiently for substantial periods of time.

BionicKangaroo emulates this with an actual elastic spring, which partially "charges" the legs on landing. The entire robotic animal weighs just 7 kilograms and stands a meter high, but it can jump 0.4 meter vertically and 0.8 meters horizontally, which is fairly impressive.

Of course, an internal power source is necessary as well, and BionicKangaroo relies on either a small compressor or a storage tank to provide high pressure air for the pneumatic muscles that power the jumping. Lightweight batteries drive everything, and a sophisticated kinematic control system keep the robot from toppling over. Control, as you might have noticed in the video, is gesture-based, via a Thalmic Labs Myo armband (which you can try out for yourself by ordering one here).

Festo sent us a neat graphic of how everything is laid out, along with a step-by-step description of the jump sequence:

The take-off and flight phase

Before the first jump, the elastic tendon is pneumatically pre-tensioned. The BionicKangaroo shifts its centre of gravity forwards and starts to tilt. As soon as a defined angle is reached at a corresponding angular velocity, the pneumatic cylinders are activated, the energy from the tendon is released and the kangaroo takes off.

In order to jump as far as possible, the kangaroo pulls its legs forward during the flight phase. This creates torque at the hip, for which the artificial animal compensates with a movement of its tail. The top of the body thereby stays almost horizontal.

The landing phase: energy for the next jump

Upon landing, the tendon is tensioned again, thus converting the kinetic energy of the previous jump to potential energy. The energy is thereby stored in the system and can be called on for the second jump. The landing phase is the critical process for recovering the energy and is responsible for the kangaroo’s efficient jumping behaviour. During this phase the tail moves towards the ground and thus back to its starting position.

Reduced energy consumption in the following jumps

If the kangaroo continues jumping, it channels the stored energy directly into the next jump. The potential energy from the elastic tendon is used again at this point. The valves switch at the right moment and the next jump begins. In this way it takes several jumps one after the other.

If the BionicKangaroo is supposed to come to a standstill, it must absorb as much energy as possible. To do so, the pneumatic actuators are switched accordingly and the tendon is actively tensioned again.

As far as we know, Festo is not intending to unleash an invasion of robotic kangaroos (as fantastic as that would be). Rather, they're exploring ways of intelligently recovering energy in industrial automation, and combining electronics with pneumatics in new ways.

At this point, we're scientifically obligated to point out that it might be more accurate to call this robot a wallaby rather than a kangaroo. Both wallabies and kangaroos are members of the same family (Macropodidae), but the generally accepted differentiator between the two is that wallabies are, well, smaller. And that's about it. So considering that this little fellow is on the diminutive side (at least, compared to a kangaroo, which can kick you in the face), we're going to suggest to Festo that BionicWallaby might be a bit more accurate.

The new robot will be officially unveiled next week at Hannover Messe.

[ Festo BionicKangaroo ]

The Conversation (0)

How Robots Can Help Us Act and Feel Younger

Toyota’s Gill Pratt on enhancing independence in old age

10 min read
An illustration of a woman making a salad with robotic arms around her holding vegetables and other salad ingredients.
Dan Page

By 2050, the global population aged 65 or more will be nearly double what it is today. The number of people over the age of 80 will triple, approaching half a billion. Supporting an aging population is a worldwide concern, but this demographic shift is especially pronounced in Japan, where more than a third of Japanese will be 65 or older by midcentury.

Toyota Research Institute (TRI), which was established by Toyota Motor Corp. in 2015 to explore autonomous cars, robotics, and “human amplification technologies,” has also been focusing a significant portion of its research on ways to help older people maintain their health, happiness, and independence as long as possible. While an important goal in itself, improving self-sufficiency for the elderly also reduces the amount of support they need from society more broadly. And without technological help, sustaining this population in an effective and dignified manner will grow increasingly difficult—first in Japan, but globally soon after.

Keep Reading ↓Show less