Recently, researchers at Harvard University have developed a platform for creating 3D printed flexible robots with embedded sensors that can detect motion, pressure, touch, and temperature. The researchers called it "basic progress" in the field of soft robots.
Two world-leading research institutes do not often exist in the same university. However, most universities don't like Harvard University. John A. Paulson School of Engineering and Applied Science (SEAS) and Wyss Bioinspired Engineering Institute recently jointly developed a 3D printing platform for creating soft robots.
Previously, researchers at Harvard University have been able to construct soft robots that can perform a variety of functions: swimming, holding objects, and even assisting human heartbeats. However, none of them can fully understand and respond to external stimuli.
The new 3D printing platform developed by Harvard changed all this, enabling scientists to create flexible robots that sense motion, pressure, touch and temperature. This is a huge leap forward in the field of soft robots and is a very exciting application of additive manufacturing technology.
"Our research represents a fundamental advance in soft robot technology," commented Ryan Truby, the first author of the research paper. "Our manufacturing platform can easily integrate complex sensing patterns into flexible robotic systems."
The secret of this process is the sensor's own 3D printing, which is made of organic ionic liquid conductive ink. This ink can be 3D printed in the robot's soft elastomeric matrix and makes the sensor soft, before they were rigid.
"To date, most integrated sensor/actuator systems for soft robots have been very simple," said Michael Wehner, a former postdoctoral fellow and co-author of the SEAS. “By printing the ionic liquid sensors directly in these soft systems, we have opened up new avenues for device design and manufacture that will ultimately allow true closed-loop control of soft robots.â€
The process involves the use of embedded 3D printing technology, a technology pioneered by Jennifer A. Lewis of the Wyss Institute.
"The functional and design flexibility of this approach is unparalleled," said Truby. "The combination of this new ink with our embedded 3D printing process allows us to combine soft sensing and driving in an integrated flexible robotic system."
Researchers at Harvard University tested their 3D printing platform. They tested inflation pressure, curvature, touch and temperature by creating a soft robotic gripper. They said that their new process could "change the way the robots create." They are now planning to try machine learning to improve soft robots.
It is reported that the research paper titled “Create Soft Somatosensory Actuators by Embedded 3D Printing†has been published in Advanced Materials magazine.
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