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Festo’s Bionic robots merge pneumatics, artificial intelligence

By Paul Heney | February 28, 2019

Festo's Bionic pneumatic robotics meet artificial intelligence

Bionic SoftHand from Festo plays Rock-Paper-Scissors. Credit: Philipp Freudigmann

Whether it’s grabbing, holding or turning, touching, typing or pressing — in everyday life, we use our hands as a matter of course for the most diverse tasks. In that regard, the human hand, with its unique combination of power, dexterity, and fine motor skills, is a true miracle tool of nature. What could be more natural than equipping robots in collaborative workspaces with a gripper that is modeled after this example from nature and solves various tasks by learning with artificial intelligence? Festo’s Bionic series does just that.

Festo announced that it will show its BionicSoftHand pneumatic robot hand at Hannover Messe 2019. Combined with the BionicSoftArm, a pneumatic lightweight robot, these future concepts are suitable for human-robot collaboration.

The BionicSoftHand is pneumatically operated so that it can interact safely and directly with people. Unlike the human hand, the BionicSoftHand has no bones. Its fingers consist of flexible bellows structures with air chambers.

The bellows are enclosed in the fingers by a special 3D textile coat knitted from both, elastic, and high-strength threads. Thanks to this soft robotics material, it is possible to determine exactly where the structure expands and generates power and where it is prevented from expanding. This makes it light, flexible, adaptable, and sensitive, yet capable of exerting strong forces.

AI-guided Bionic grasping

The methods for machines to learn are comparable with those of humans. They require positive or negative feedback to their actions in order to classify and learn from them. BionicSoftHand uses this method of reinforcement learning.

This means instead of imitating a specific action, the hand is merely given a goal. It uses trial and error to achieve its goal. Based on received feedback, the Bionic gripper gradually optimizes its actions until the task is finally solved.

Specifically, the BionicSoftHand can rotate a 12-sided cube so that a previously defined side ends up on top. The necessary movement strategy is taught in a virtual environment with the aid of a digital twin, which is created with the help of data from a depth-sensing camera and computer vision algorithms.

Proportional piezo valves for precise control

To minimize the effects of tubing, Festo’s developers have specially designed a small, digitally controlled valve terminal, which is mounted directly on the BionicSoftHand. This means that the tubes for controlling the gripper fingers do not have to be pulled through the entire robot arm.

Thus, the BionicSoftHand can be quickly and easily connected and operated with only one tube each for supply air and exhaust air. With the proportional piezo valves used, the movements of the fingers can be precisely controlled.

The days of strict separation between factory workers and automation are passing, thanks to collaborative robots. As their workspaces converge, humans and machines will be able to work simultaneously on the same workpiece or component — without having to be shielded from each other for safety reasons.

The BionicSoftArm is a compact further development of Festo’s BionicMotionRobot, whose range of applications has been significantly expanded. Thanks to its modular design, the Bionic arm can be combined with up to seven pneumatic bellows segments and rotary drives. This guarantees maximum flexibility in terms of reach and mobility. The arm can work around obstacles even in the tightest of spaces if necessary.

At the same time, it is completely flexible and can work safely with people. Direct human-robot collaboration is possible with the BionicSoftArm, as well as its use in classic SCARA applications, such as pick-and-place tasks.

Flexible application possibilities

The modular robot arm can be used for a wide variety of applications, depending on the design and mounted gripper. Thanks to its flexible kinematics, the BionicSoftArm can interact directly and safely with humans.

At the same time, the kinematics make it easier for the Bionic arm to adapt to different tasks at various locations in production environments. The elimination of costly safety devices such as cages and light barriers shortens conversion times and thus enables flexible use – completely in accordance with adaptive and economical production.

BionicFinWave: Underwater robot with unique fin drive

Nature teaches us impressively, how optimal drive systems for certain swimming movements should look. To move forward, the marine planarian and sepia create a continuous wave with their fins, which advances along their entire length.

For the BionicFinWave, the bionics team was inspired by this undulating fin movement. The undulation pushes the water backwards, creating a forward thrust. This principle allows the BionicFinWave to maneuver forwards or backwards through an acrylic tube system.

The BionicFinWave’s two side fins are completely cast out of silicone and do not require struts or other supporting elements. The two fins are attached to the left and right of nine small lever arms, which in turn are powered by two servo motors. Two adjacent crankshafts transmit the force to the levers so that the two fins can be moved individually to generate different shaft patterns. They are particularly suitable for slow and precise locomotion and whirl up less water than, for example, a screw drive.

A cardan joint is located between each lever segment to ensure that the Bionic robot’s crankshafts are flexible. For this purpose, the crankshafts including the joints and the connecting rod are made of plastic in one piece using the 3D printing process.

Intelligent interaction of a wide variety of components

The remaining elements in the BionicFinWave’s body are also 3D-printed, which enables its complex geometries in the first place. With their cavities, they act as flotation units.

At the same time, the entire control and regulation technology are watertight, safely installed and synchronized in a very tight space. The Festo Bionic Learning Network has continued its innovative approach to robotics.

About The Author

Paul Heney

Paul is a dynamic editor, writer and public speaker with more than 20 years experience in b2b magazines, online content and editorial management. He is the Editorial Director for Design World at WTWH Media LLC, helping design engineers parse the flood of information available online today - so they can receive critical information for performing their jobs more efficiently. He leads an editorial team comprised of engineers, technical journalists and freelance writers.

Comments

  1. george edwards says

    April 10, 2019 at 9:18 am

    THIS IS VERY GOOD ARTICLE ABOUT A TERRIFIC ADVANCEMENT. Thank you!
    do you know if Festo is applying anything like the bio-arm/hand to something like exo-skeletons to aid humans with disabilities such as ALS? a merging of bio devices to the human body?
    can you send this question to a contact at Festo?

    Reply

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