Sawyer Buckminster Fuller |
Motion control in tiny flying robots and insects
Thanks for visiting! I am a roboticist and a bioengineer who humbly studies biology for inspiration. These pages are mainly about my research.
How can you create a fully autonomous flying robot as small as a fly? I am working to solve this problem by combining robot engineering with experimental study on flies. Insect-sized robots will be deployed where small size and maneuverability give them an advantage. For example, their low materials cost could enable swarms to perform detailed measurement of pollutant concentrations in cities or the environment in agriculture. However, miniaturization poses challenges because scaling physics dictates that many conventional approaches used in larger aircraft, from electric motors and fixed wings, to GPS sensing and general-purpose microprocessors, cannot operate efficiently or effectively at insect scale. Finding solutions will require fundamental advances in fabrication, sensing, and control. One approach is to look to flying insects, which have not only overcome these challenges, but exhibit superlative agility that surpasses anything man-made. Observe a fly deftly avoiding a flyswatter or a honeybee landing on a flower buffeted by wind. These animals point the way toward future insect robots that can adeptly navigate complex, uncertain environments. My ultimate aim is to use the solutions that are found to satisfy insect-scale constraints to drive innovation across engineering. The result will be more robust, dynamic, and power-efficient autonomous systems with wider practical application, and greater insight into the operation of the brain.
Below are some highlights from my work. Outside of this area, I have also helped build a frog-inspired hopping rover for interplanetary exploration for NASA with Paolo Fiorini and Joel Burdick and an ink-jet printer that can pattern nerve cells with Sebastian Seung and Shuguang Zhang at MIT. I also built the first ink-jet printer capable of fabricating electronic circuits and and 3D metal machines with Joseph Jacobson, inventor of E-ink electronic paper in the Amazon Kindle. I also have pages about past engineering projects and art.
|Using insect-inspired vision to fly
We mounted a four-pixel sensor inspired by insect ocelli to the top of a fly-sized flying robot. This enabled the first flights at this scale stabilized using feedback only from sensors carried onboard. Without it the robot quickly tumbles because of dynamic instability.
Fuller, Karpelson, Censi, Ma, and Wood, J. Royal Society Interface, June 2014.
[PDF | video | Press: The Scientist Motherboard Science News]
|Flies sense wind to stabilize flight |
We used cameras to record how flies respond to impulsive wind gusts while in flight. This revealed a multi-sensory mechanism to regulate groundspeed that combines vision and airspeed-sensing antennae.
Fuller, Straw, Peek, Murray, and Dickinson, Proc. Nat. Acad. Sci., April 2014.
[PDF | Press: Phys.org RedOrbit, Caltech News, Homepage PNAS Featured image]
Free-flight of a fly-sized robot |
As aircraft scale diminishes to that of insects, new effects begin to dominate because of scaling physics. We developed unconventional, scale-appropriate fabrication, aerodynamics, actuation, and control technology to realize the first controlled flight of a vehicle the size of a fly.
Ma, Chirarattananon, Fuller, and Wood, Science, May 2013.
[video | Press: Wired New York Times Economist]
Biomimetic wind sensing |
A flight-weight sensor (yellow appendage at right) measures airspeed on a fly-sized flapping-wing robot, with Andreas Haggerty.
Fuller, Sands, Haggerty, Karpelson, Ma, and Wood, Int. Conf. on Robotics and Automation, 2013. [PDF]
Computation-limited visual motion control|
Without GPS, tiny aerial vehicles will use vision to navigate confined spaces. Yet vision is typically computation intensive. We showed how a hovercraft robot can visually navigate a narrow corridor using only 20,000 multiply operations per second, compatible with the 10 mW avionics power budget of a fly-sized robot.
Fuller and Murray, Int. Conf. on Robotics and Biomimetics, 2011. [PDF | video]
Ink-jet fabricated micro-machines|
I developed the first ink-jet printer capable of building of metal machines. Using a nanoparticle ink, I printed electrostatic motors (above, tip of a mechanical pencil shown for scale), cantilever actuators with hundreds of layers, and a high-conductivity resonant electric coil.
Fuller, Wilhelm, and Jacobson, J. Micro-electromechanical Systems, 2002. [PDF | video | Press: MIT Technology Review (cover)]
Education (Resume/curriculum vitae)
I grew up mostly in Central California, graduating from Morro Bay High School. I have lived in Guatemala, Florida, Massachusetts, and Italy. My dad, boat builder Kirk Fuller, builds sailing catamarans and other vehicles that disdain conventional wisdom. My mom, Patrice Engle, was a professor of psychology and Senior Officer for Child Development at UNICEF where she worked on the science and policy of global child development. She passed away from non-smoking lung cancer in 2012.
When away from work, I really like riding my bike. I play soccer and ultimate frisbee, and sometimes I make art. And when I get a chance I love being in the water, whether it's charging deep into the barrel (that is, surfing), sailing, windsurfing, or kayaking.
Relation to R. Buckminster Fuller
Richard Buckminster Fuller was an architect, mathematician, entrepreneur, and author (and Harvard dropout). Both the 60-carbon "Buckminsterfullerene" molecule and I were named after him, but neither of us has any known relation to him. Buckminsterfullerene was discovered after his death and was named because of its resemblance to his geodesic dome. But Fuller and I were alive at the same time, so you can judge for yourself if there's any resemblance in this picture : ).
My favorite part about Buckminster Fuller was how much emphasis he put on thinking orthogonally to convention. He questioned why buildings had to be square, for example. His suggestion was to instead rely on the intrinsic strength of triangles and efficiently enclose space with spheres like the geodesic dome. But his main concern was poverty. He believed that technology was advanced enough that the cost of being poor should not be a lack of basic needs like food, water, or medicine. That so many still did not have these essentials, including his own daughter who died at a young age, indicated that radical thinking was required. He believed the solution lay in a combination of entrepreneurship, commerce, and focus on environmental sustainability, and promoted his ideas vigorously. This led to a saying by idealistic youth in the 60's and 70's, perhaps echoed by my parents, to "never trust anyone over 30 -- except Bucky." His writing can be opaque, so I've been watching his videos on Youtube.
Sawyer Buckminster Fuller
60 Oxford St. Rm. 407
Cambridge, MA 02138
Email: my harvard username is minster. The email format is firstname.lastname@example.org