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SHRIMP project looks for micro power supplies for insect robots

SHRIMP project looks for micro power supplies for insect robots

Technology News |
By Nick Flaherty



The SHort-Range Independent Microrobotic Platforms (SHRIMP) programme is aiming to develop and demonstrate multi-functional micro-to-milli robotic platforms for use in natural and critical disaster scenarios. To achieve this mission, SHRIMP will explore fundamental research in actuator materials and mechanisms as well as power storage components, both of which are necessary to create the strength, dexterity, and independence of functional microrobotics platforms.

The programme will end up with a competition between technologies in the same way that previous challenges have led to driverless cars.

“Whether in a natural disaster scenario, a search and rescue mission, a hazardous environment, or other critical relief situation, robots have the potential to provide much needed aide and support,” said Dr. Ronald Polcawich, a DARPA program manager in the Microsystems Technology Office (MTO). “However, there are a number of environments that are inaccessible for larger robotic platforms. Smaller robotics systems could provide significant aide, but shrinking down these platforms requires significant advancement of the underlying technology.”

Technological advances in microelectromechanical systems (MEMS), additive manufacturing, piezoelectric actuators, and low-power sensors have allowed researchers to expand into the realm of micro-to-milli robotics. However, due to the technical obstacles experienced as the technology shrinks, these platforms lack the power, navigation, and control to accomplish complex tasks proficiently.

SHRIMP seeks to develop highly efficient power storage devices and power conversion circuitry. Most micro-robotics platforms rely on tethers for power, processing, or control, and are significantly constrained by energy-inefficient actuation technology as well as limited-energy storage devices. As SHRIMP aims to create complex micro-to-milli robots that operate independently, creating compact power sources and converters that can support high-voltage actuation mechanisms and significantly reduce battery drain becomes critical. The programme will explore fundamental research into power converters that can operate at frequencies of tens of Hz with exceptional efficiency as well as high energy density and high specific energy battery technologies.

“Micro-to-mm sized platforms provide a unique opportunity to push the development of highly efficient, versatile microelectronics,” said Polcawich. “While the goal of SHRIMP is develop small-scale, independent robotics platforms, we anticipate that discoveries made through our actuator and power storage research could prove beneficial to a number of fields currently constrained by these technical challenges–from prosthetics to optical steering.”

Researchers are also looking at actuator materials and mechanisms that prioritize force generation, efficiency, strength-to-weight ratio, and maximum work density. “The strength-to-weight ratio of an actuator influences both the load-bearing capability and endurance of a micro-robotic platform, while the maximum work density characterizes the capability of an actuator mechanism to perform high intensity tasks or operate over a desired duration,” said Polcawich. “Making significant advances to actuator mechanisms and materials will greatly impact our ability to develop micro-to-milli robotic platforms capable of performing complex tasks in the field.”While advancing actuator and power supply technology will help to significantly advance the field, they are only part of the challenge when it comes to developing micro-to-milli robotics. “Engineering for extreme SWaP minimization is a diverse task that must take these areas into account but also the mechanical, electrical, and thermal considerations required for designing a highly-functional microsystem,” said Polcawich.

SHRIMP platforms will be evaluated using many of the same principles employed in the National Institute of Standards and Technology (NIST) Robotics Test Facility, which has been adapted for these micro-to-milli platforms. To determine potential field utility, each participating team will compete in an Olympic-style evaluation to test the platform’s mobility, maneuverability across flat and inclined surfaces, load-bearing capability, speed, and other capabilities.

www.darpa.gov

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