Robotic Insect Mimics the Ability of the Water Strider to Jump On Water

International team of researchers looked to water strider insects to develop a robot that jumps off water’s surface.

The concept of walking on water might sound supernatural, but in fact it is a quite natural phenomenon. Many small living creatures leverage water’s surface tension to maneuver themselves around. One of the most complex maneuvers, jumping on water, is achieved by a species of semi-aquatic insects called water striders that not only skim along water’s surface but also generate enough upward thrust with their legs to launch themselves airborne from it.

Now, emulating this natural form of water-based locomotion, an international team of scientists from Seoul National University, Korea (SNU), Harvard’s Wyss Institute for Biologically Inspired Engineering, and the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS), has unveiled a novel robotic insect that can jump off of water’s surface. In doing so, they have revealed new insights into the natural mechanics that allow water striders to jump from rigid ground or fluid water with the same amount of power and height. The work is reported in the July 31 issue of Science.

“Water’s surface needs to be pressed at the right speed for an adequate amount of time, up to a certain depth, in order to achieve jumping,” said the study’s co-senior author Kyu Jin Cho, Associate Professor in the Department of Mechanical and Aerospace Engineering and Director of the Biorobotics Laboratory at Seoul National University. “The water strider is capable of doing all these things flawlessly.”

The water strider, whose legs have slightly curved tips, employs a rotational leg movement to aid it its takeoff from the water’s surface, discovered co-senior author Ho-Young Kim who is Professor in SNU’s Department of Mechanical and Aerospace Engineering and Director of SNU’s Micro Fluid Mechanics Lab. Kim, a former Wyss Institute Visiting Scholar, worked with the study’s co-first author Eunjin Yang, a graduate researcher at SNU’s Micro Fluid Mechanics lab, to collect water striders and take extensive videos of their movements to analyze the mechanics that enable the insects to skim on and jump off water’s surface.

It took the team several trial and error attempts to fully understand the mechanics of the water strider, using robotic prototypes to test and shape their hypotheses.

“If you apply as much force as quickly as possible on water, the limbs will break through the surface and you won’t get anywhere,” said Robert Wood, Ph.D., who is a co-author on the study, a Wyss Institute Core Faculty member, the Charles River Professor of Engineering and Applied Sciences at SEAS, and founder of the Harvard Microrobotics Lab.

But by studying water striders in comparison to iterative prototypes of their robotic insect, the SNU and Harvard team discovered that the best way to jump off of water is to maintain leg contact on the water for as long as possible during the jump motion.

“Using its legs to push down on water, the natural water strider exerts the maximum amount of force just below the threshold that would break the water’s surface,” said the study’s co-first author Je-Sung Koh, Ph.D., who was pursuing his doctoral degree at SNU during the majority of this research and is now a Postdoctoral Fellow at the Wyss Institute and SEAS.

This image shows the robot jumping on water.
For the robotic insect to jump off water, the lightweight catapult mechanism uses a burst of momentum coupled with limited thrust to propel the robot off the water without breaking the water’s surface. An automatic triggering mechanism, built from composite materials and actuators, was employed to activate the catapult. Image credit: Wyss Institute at Harvard University.

Mimicking these mechanics, the robotic insect built by the team can exert up to 16 times its own body weight on the water’s surface without breaking through, and can do so without complicated controls. Many natural organisms such as the water strider can perform extreme styles of locomotion — such as flying, floating, swimming, or jumping on water – with great ease despite a lack of complex cognitive skills.

“This is due to their natural morphology,” said Cho. “It is a form of embodied or physical intelligence, and we can learn from this kind of physical intelligence to build robots that are similarly capable of performing extreme maneuvers without highly-complex controls or artificial intelligence.”

The robotic insect was built using a “torque reversal catapult mechanism” inspired by the way a flea jumps, which allows this kind of extreme locomotion without intelligent control. It was first reported by Cho, Wood and Koh in 2013 in the International Conference on Intelligent Robots and Systems.

For the robotic insect to jump off water, the lightweight catapult mechanism uses a burst of momentum coupled with limited thrust to propel the robot off the water without breaking the water’s surface. An automatic triggering mechanism, built from composite materials and actuators, was employed to activate the catapult.


In this video, watch how novel robotic insects developed by a team of Seoul National University and Harvard scientists can jump directly off water’s surface. The robots emulate the natural locomotion of water strider insects, which skim on and jump off the surface of water. Credit: Wyss Institute at Harvard University

To produce the body of the robotic insect, “pop-up” manufacturing was used to create folded composite structures that self-assemble much like the foldable components that “pop-up” in 3D books. Devised by engineers at SEAS and the Wyss Institute, this ingenious layering and folding process enables the rapid fabrication of microrobots and a broad range of electromechanical devices.

“The resulting robotic insects can achieve the same momentum and height that could be generated during a rapid jump on firm ground – but instead can do so on water — by spreading out the jumping thrust over a longer amount of time and in sustaining prolonged contact with the water’s surface,” said Wood.

“This international collaboration of biologists and roboticists has not only looked into nature to develop a novel, semi-aquatic bioinspired robot that performs an new extreme form of robotic locomotion, but has also provided us with new insights on the natural mechanics at play in water striders,” said Wyss Institute Founding Director Donald Ingber, M.D., Ph.D.

About this neuroscience research

Additional co-authors of the study include Gwang-Pil Jung, a Ph.D. candidate in SNU’s Biorobotics Laboratory; Sun-Pill Jung, an M.S. candidate in SNU’s Biorobotics Laboratory; Jae Hak Son, who earned his Ph.D. in SNU’s Laboratory of Behavioral Ecology and Evolution; Sang-Im Lee, Ph.D., who is Research Associate Professor at SNU’s Institute of Advanced Machines and Design and Adjunct Research Professor at the SNU’s Laboratory of Behavioral Ecology and Evolution; and Piotr Jablonski, Ph.D., who is Professor in SNU’s Laboratory of Behavioral Ecology and Evolution.

Funding: This work was supported by the National Research Foundation of Korea, Bio-Mimetic Robot Research Center funding from the Defense Acquisition Program Administration, and the Wyss Institute for Biologically Inspired Engineering at Harvard University.

Source: Kat J. McAlpine – Wyss Institute at Harvard University
Image Credit: The image is credited to Wyss Institute at Harvard University and is adapted from the video
Video Source: The video is credited to Wyss Institute at Harvard University
Original Research: Abstract for “Jumping on water: Surface tension–dominated jumping of water striders and robotic insects” by Je-Sung Koh, Eunjin Yang, Gwang-Pil Jung, Sun-Pill Jung, Jae Hak Son, Sang-Im Lee, Piotr G. Jablonski, Robert J. Wood, Ho-Young Kim, and Kyu-Jin Cho in Science. Published online July 30 2015 doi:10.1126/science.aab1637


Abstract

Jumping on water: Surface tension–dominated jumping of water striders and robotic insects

Jumping on water is a unique locomotion mode found in semi-aquatic arthropods, such as water striders. To reproduce this feat in a surface tension–dominant jumping robot, we elucidated the hydrodynamics involved and applied them to develop a bio-inspired impulsive mechanism that maximizes momentum transfer to water. We found that water striders rotate the curved tips of their legs inward at a relatively low descending velocity with a force just below that required to break the water surface (144 millinewtons/meter). We built a 68-milligram at-scale jumping robotic insect and verified that it jumps on water with maximum momentum transfer. The results suggest an understanding of the hydrodynamic phenomena used by semi-aquatic arthropods during water jumping and prescribe a method for reproducing these capabilities in artificial systems.

“Jumping on water: Surface tension–dominated jumping of water striders and robotic insects” by Je-Sung Koh, Eunjin Yang, Gwang-Pil Jung, Sun-Pill Jung, Jae Hak Son, Sang-Im Lee, Piotr G. Jablonski, Robert J. Wood, Ho-Young Kim, and Kyu-Jin Cho in Science. Published online July 30 2015 doi:10.1126/science.aab1637

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