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DARPA’s Soft Robot And Its Invisibility Cloak: Now You See It, Now You Don’t
Harvard University researchers working under DARPA’s Maximum Mobility and Manipulation (M3) program recently demonstrated the ability to manufacture low-cost silicone robots with microfluidic channels that allow for air and fluids to be pumped in to control movement, color and temperature.
In this video, a soft robot walks onto a bed of rocks and is filled with fluid to match the color of the rocks and break up the robot’s shape. The robot moves at a speed of approximately 40 meters per hour; absent the colored fluid, it can move at approximately 67 meters per hour.
Future research will be directed at smoothing the movements; however, speed is less important than the robot’s flexibility. Soft robots are useful because they are resilient and can maneuver through very constrained spaces.
For this demonstration, the researchers used tethers to attach the control system and to pump pressurized gases and liquids into the robot. Tethered operation reduces the size and weight of such robots by leaving power sources and pumps off-board, but future prototypes could incorporate that equipment in a self-contained system. At a pumping rate of 2.25 mL per minute, color change in the robot required 30 seconds. Once filled, the color layers require no power to sustain the color.
In a development to be reported in the August 17 issue of Science, researchers led by Drs. George Whitesides and Stephen Morin at Harvard University’s Department of Chemistry and Chemical Biology and the Wyss Institute for Biologically Inspired Engineering demonstrated that microfluidic channels in soft robots enable functions including actuation, camouflage, display, fluid transport and temperature regulation. The work is being performed under DARPA’s Maximum Mobility and Manipulation (M3) program.
In DARPA’s soft robot, the microfluidic networks used for camouflage or display are contained in thin silicone sheets referred to as color layers. Various heated or cooled dye, chemiluminescent and fluorescent solutions and water can be pumped through the color layers to adjust temperature and appearance.
Why does this matter to the Department of Defense? DARPA foresees robots of many shapes and sizes contributing to a wide range of future defense missions, but robotics is still a young field that has focused much of its attention so far on complex hardware. Consequently, the costs associated with robotics are typically very high. What DARPA has achieved with silicone-based soft robots is development of a very low cost manufacturing method that uses molds. By introducing narrow channels into the molds through which air and various types of fluids can be pumped, a robot can be made to change its color, contrast, apparent shape and temperature to blend with its environment, glow through chemiluminescence, and most importantly, achieve actuation, or movement, through pneumatic pressurization and inflation of the channels. The combination of low cost and increased capabilities means DARPA has removed one of the major obstacles to greater DoD adoption of robot technology.
Gill Pratt, the DARPA program manager for M3, put the achievement in context: “DARPA is developing a suite of robots that draw inspiration from the ingenuity and efficiency of nature. For defense applications, ingenuity and efficiency are not enough—robotic systems must also be cost effective. This novel robot is a significant advance towards achieving all three goals.”
In the video above, a soft robot walks onto a bed of rocks and is filled with fluid to match the color of the rocks and break up the robot’s shape. The robot moves at a speed of approximately 40 meters per hour; absent the colored fluid, it can move at approximately 67 meters per hour. Future research will focus on smoothing the movements; however, speed is less important than the robot’s flexibility. Soft robots are useful because they are resilient and can maneuver through very constrained spaces.
For this demonstration, the researchers used tethers to attach the control system and pump pressurized gases and liquids into the robot. Tethered operation reduces the size and weight of such robots by leaving power sources and pumps off-board, but future prototypes could incorporate that equipment in a self-contained system. At a pumping rate of 2.25 milliliters per minute, color change in the robot required 30 seconds. Once filled, the color layers require no power to sustain the color.
Aside from their potential tactical value, soft robots with microfluidic channels could also have medical applications. The devices could simulate fluid vessels and muscle motion for realistic modeling or training, and may be used in prosthetic technology.
The Maximum Mobility and Manipulation (M3) program is striving to create and demonstrate significant scientific and engineering advances in robotics that will:
Create a significantly improved scientific framework for the rapid design and fabrication of robot systems and greatly enhance robot mobility and manipulation in natural environments.
Significantly improve robot capabilities through fundamentally new approaches to the engineering of better design tools, fabrication methods, and control algorithms. The M3 program covers scientific advancement across four tracks: design tools, fabrication methodologies, control methods, and technology demonstration prototypes.
This video has been sped up. The actual duration is 2m 27s.
