Tag Archives: pneumatic
Jerky mechanical robots are staples of science fiction, but to seamlessly integrate into everyday life they’ll need the precise yet powerful motor control of humans. Now scientists have created a new class of artificial muscles that could soon make that a reality.
The advance is the latest breakthrough in the field of soft robotics. Scientists are increasingly designing robots using soft materials that more closely resemble biological systems, which can be more adaptable and better suited to working in close proximity to humans.
One of the main challenges has been creating soft components that match the power and control of the rigid actuators that drive mechanical robots—things like motors and pistons. Now researchers at the University of Colorado Boulder have built a series of low-cost artificial muscles—as little as 10 cents per device—using soft plastic pouches filled with electrically insulating liquids that contract with the force and speed of mammalian skeletal muscles when a voltage is applied to them.
Three different designs of the so-called hydraulically amplified self-healing electrostatic (HASEL) actuators were detailed in two papers in the journals Science and Science Robotics last week. They could carry out a variety of tasks, from gently picking up delicate objects like eggs or raspberries to lifting objects many times their own weight, such as a gallon of water, at rapid repetition rates.
“We draw our inspiration from the astonishing capabilities of biological muscle,” Christoph Keplinger, an assistant professor at UC Boulder and senior author of both papers, said in a press release. “Just like biological muscle, HASEL actuators can reproduce the adaptability of an octopus arm, the speed of a hummingbird and the strength of an elephant.”
The artificial muscles work by applying a voltage to hydrogel electrodes on either side of pouches filled with liquid insulators, which can be as simple as canola oil. This creates an attraction between the two electrodes, pulling them together and displacing the liquid. This causes a change of shape that can push or pull levers, arms or any other articulated component.
The design is essentially a synthesis of two leading approaches to actuating soft robots. Pneumatic and hydraulic actuators that pump fluids around have been popular due to their high forces, easy fabrication and ability to mimic a variety of natural motions. But they tend to be bulky and relatively slow.
Dielectric elastomer actuators apply an electric field across a solid insulating layer to make it flex. These can mimic the responsiveness of biological muscle. But they are not very versatile and can also fail catastrophically, because the high voltages required can cause a bolt of electricity to blast through the insulator, destroying it. The likelihood of this happening increases in line with the size of their electrodes, which makes it hard to scale them up. By combining the two approaches, researchers get the best of both worlds, with the power, versatility and easy fabrication of a fluid-based system and the responsiveness of electrically-powered actuators.
One of the designs holds particular promise for robotics applications, as it behaves a lot like biological muscle. The so-called Peano-HASEL actuators are made up of multiple rectangular pouches connected in series, which allows them to contract linearly, just like real muscle. They can lift more than 200 times their weight, but being electrically powered, they exceed the flexing speed of human muscle.
As the name suggests, the HASEL actuators are also self-healing. They are still prone to the same kind of electrical damage as dielectric elastomer actuators, but the liquid insulator is able to immediately self-heal by redistributing itself and regaining its insulating properties.
The muscles can even monitor the amount of strain they’re under to provide the same kind of feedback biological systems would. The muscle’s capacitance—its ability to store an electric charge—changes as the device stretches, which makes it possible to power the arm while simultaneously measuring what position it’s in.
The researchers say this could imbue robots with a similar sense of proprioception or body-awareness to that found in plants and animals. “Self-sensing allows for the development of closed-loop feedback controllers to design highly advanced and precise robots for diverse applications,” Shane Mitchell, a PhD student in Keplinger’s lab and an author on both papers, said in an email.
The researchers say the high voltages required are an ongoing challenge, though they’ve already designed devices in the lab that use a fifth of the voltage of those features in the recent papers.
In most of their demonstrations, these soft actuators were being used to power rigid arms and levers, pointing to the fact that future robots are likely to combine both rigid and soft components, much like animals do. The potential applications for the technology range from more realistic prosthetics to much more dextrous robots that can work easily alongside humans.
It will take some work before these devices appear in commercial robots. But the combination of high-performance with simple and inexpensive fabrication methods mean other researchers are likely to jump in, so innovation could be rapid.
Image Credit: Keplinger Research Group/University of Colorado Continue reading
Cambridge, MA – Soft Robotics Inc, which has built a fundamentally new class of robotic grippers, announced the release of its expanded and upgraded Soft Robotics Development Kit; SRDK 2.0.
The Soft Robotics Development Kit 2.0 comes complete with:
Robot tool flange mounting plate
4, 5 and 6 position hub plates
Tool Center Point
Soft Robotics Control Unit G2
6 rail mounted, 4 accordion actuator modules
Custom pneumatic manifold
Mounting hardware and accessories
Where the SRDK 1.0 included 5 four accordion actuator modules and the opportunity to create a gripper containing two to five actuators, The SRDK 2.0 contains 6 four accordion actuator modules plus the addition of a six position hub allowing users the ability to configure six actuator test tools. This expands use of the Development Kit to larger product applications, such as: large bagged and pouched items, IV bags, bags of nuts, bread and other food items.
SRDK 2.0 also contains an upgraded Soft Robotics Control Unit (SRCU G2) – the proprietary system that controls all software and hardware with one turnkey pneumatic operation. The upgraded SRCU features new software with a cleaner, user friendly interface and an IP65 rating. Highly intuitive, the software is able to store up to eight grip profiles and allows for very precise adjustments to actuation and vacuum.
Also new with the release of SRDK 2.0, is the introduction of several accessory kits that will allow for an expanded number of configurations and product applications available for testing.
Accessory Kit 1 – For SRDK 1.0 users only – includes the six position hub and 4 accordion actuators now included in SRDK 2.0
Accessory Kit 2 – For SRDK 1.0 or 2.0 users – includes 2 accordion actuators
Accessory Kit 3 – For SRDK 1.0 or 2.0 users – includes 3 accordion actuators
The shorter 2 and 3 accordion actuators provide increased stability for high-speed applications, increased placement precision, higher grip force capabilities and are optimized for gripping small, shallow objects.
Designed to plug and play with any existing robot currently in the market, the Soft Robotics Development Kit 2.0 allows end-users and OEM Integrators the ability to customize, test and validate their ideal Soft Robotics solution, with their own equipment, in their own environment.
Once an ideal solution has been found, the Soft Robotics team will take those exact specifications and build a production-grade tool for implementation into the manufacturing line. And, it doesn’t end there. Created to be fully reusable, the process – configure, test, validate, build, production – can start over again as many times as needed.
See the new SRDK 2.0 on display for the first time at PACK EXPO Las Vegas, September 25 – 27, 2017 in Soft Robotics booth S-5925.
Learn more about the Soft Robotics Development Kit at www.softroboticsinc.com/srdk.
Photo Credit: Soft Robotics – www.softroboticsinc.com
About Soft Robotics
Soft Robotics designs and builds soft robotic gripping systems and automation solutions
that can grasp and manipulate items of varying size, shape and weight. Spun out of the
Whitesides Group at Harvard University, Soft Robotics is the only company to be
commercializing this groundbreaking and proprietary technology platform. Today, the
company is a global enterprise solving previously off-limits automation challenges for
customers in food & beverage, advanced manufacturing and ecommerce. Soft Robotics’
engineers are building an ecosystem of robots, control systems, data and machine
learning to enable the workplace of the future. For more information, please visit
The Kondracki Group, LLC
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Each week we scour the web for great articles and fascinating advances across our core topics, from AI to biotech and the brain. But robots have a special place in our hearts. This week, we took a look back at 2017 so far and unearthed a few favorite robots for your reading and viewing pleasure.
Tarzan the Swinging Robot Could Be the Future of FarmingMariella Moon | Engadget“Tarzan will be able to swing over crops using its 3D-printed claws and parallel guy-wires stretched over fields. It will then take measurements and pictures of each plant with its built-in camera while suspended…While it may take some time to achieve that goal, the researchers plan to start testing the robot soon.”
Grasping Robots Compete to Rule Amazon’s Warehouses Tom Simonite | Wired“Robots able to help with so-called picking tasks would boost Amazon’s efficiency—and make it much less reliant on human workers. It’s why the company has invited a motley crew of mechanical arms, grippers, suction cups—and their human handlers—to Nagoya, Japan, this week to show off their manipulation skills.”
Robots Learn to Speak Body LanguageAlyssa Pagano | IEEE Spectrum“One notable feature of the OpenPose system is that it can track not only a person’s head, torso, and limbs but also individual fingers. To do that, the researchers used CMU’s Panoptic Studio, a dome lined with 500 cameras, where they captured body poses at a variety of angles and then used those images to build a data set.”
I Watched Two Robots Chat Together on Stage at a Tech EventJon Russell | TechCrunch“The robots in question are Sophia and Han, and they belong to Hanson Robotics, a Hong Kong-based company that is developing and deploying artificial intelligence in humanoids. The duo took to the stage at Rise in Hong Kong with Hanson Robotics’ Chief Scientist Ben Goertzel directing the banter. The conversation, which was partially scripted, wasn’t as slick as the human-to-human panels at the show, but it was certainly a sight to behold for the packed audience.”
How This Japanese Robotics Master Is Building Better, More Human AndroidsHarry McCracken | Fast Company“On the tech side, making a robot look and behave like a person involves everything from electronics to the silicone Ishiguro’s team uses to simulate skin. ‘We have a technology to precisely control pneumatic actuators,’ he says, noting, as an example of what they need to re-create, that ‘the human shoulder has four degrees of freedom.’”
Stock Media provided by Besjunior / Pond5 Continue reading