RoboFly: An Insect-Sized Robot With Simplified Fabrication That Is Capable of Flight, Ground, and Water Surface Locomotion

Insect-sized ($\sim$100 mg) aerial robots have advantages over larger robots because of their small size, low weight, and low materials cost. Previous iterations have demonstrated controlled flight but were difficult to fabricate because they consisted of many separate parts assembled together and were also unable to perform locomotion modes besides flight. This article presents a new design of a 74-mg flapping-wing robot that dramatically reduces the number of parts and simplifies fabrication. The robot also has a lower center of mass, which allows the robot to additionally land without the need for long legs, even in case of unstable flight. We also show that the new design allows for wing-driven ground and air–water interfacial locomotion, improving the versatility of the robot. During surface ambulation, forward thrust is generated by increasing the speed of the upstroke relative to the downstroke of the flapping wings. Adjusting relative wing stroke amplitudes also allows for steering. The ability to land and subsequently move along the ground first presented here allows the robot to negotiate extremely confined spaces and underneath obstacles. We present results demonstrating these capabilities, as well as hovering flight and controlled landing.

[1]  R. Wood,et al.  Perching and takeoff of a robotic insect on overhangs using switchable electrostatic adhesion , 2016, Science.

[2]  Shyamnath Gollakota,et al.  Liftoff of a 190 mg Laser-Powered Aerial Vehicle: The Lightest Wireless Robot to Fly , 2018, 2018 IEEE International Conference on Robotics and Automation (ICRA).

[3]  Geoffrey L. Barrows,et al.  An Insect-Sized Robot That Uses a Custom-Built Onboard Camera and a Neural Network to Classify and Respond to Visual Input , 2018, 2018 7th IEEE International Conference on Biomedical Robotics and Biomechatronics (Biorob).

[4]  Kevin Y. Ma,et al.  Controlled Flight of a Biologically Inspired, Insect-Scale Robot , 2013, Science.

[5]  J. M. Bush,et al.  The hydrodynamics of water-walking arthropods , 2010, Journal of Fluid Mechanics.

[6]  Sawyer B. Fuller,et al.  A New Robot Fly Design That is Easier to Fabricate and Capable of Flight and Ground Locomotion , 2018, 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS).

[7]  Roger D. Quinn,et al.  A biologically inspired micro-vehicle capable of aerial and terrestrial locomotion , 2009 .

[8]  J. M. Bush,et al.  Walking on Water: Biolocomotion at the Interface , 2006 .

[9]  J. P. Whitney,et al.  Pop-up book MEMS , 2011 .

[10]  Metin Sitti,et al.  Surface-Tension-Driven Biologically Inspired Water Strider Robots: Theory and Experiments , 2007, IEEE Transactions on Robotics.

[11]  J. Marden,et al.  Rowing locomotion by a stonefly that possesses the ancestral pterygote condition of co-occurring wings and abdominal gills , 2003 .

[12]  Robert J. Wood,et al.  Design, fabrication, and modeling of the split actuator microrobotic bee , 2012, 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[13]  Joonbum Bae,et al.  Locomotion of arthropods in aquatic environment and their applications in robotics , 2018, Bioinspiration & biomimetics.

[14]  Joshua R. Smith,et al.  Powering the next billion devices with wi-fi , 2015, CoNEXT.

[15]  Claire Tomlin,et al.  An Insect-scale Untethered Laser-powered Jumping Microrobot , 2019, ArXiv.

[16]  Robert J. Wood,et al.  Adaptive control for takeoff, hovering, and landing of a robotic fly , 2013, 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[17]  Neel Doshi,et al.  Controllable water surface to underwater transition through electrowetting in a hybrid terrestrial-aquatic microrobot , 2018, Nature Communications.

[18]  Sawyer B. Fuller,et al.  Four Wings: An Insect-Sized Aerial Robot With Steering Ability and Payload Capacity for Autonomy , 2019, IEEE Robotics and Automation Letters.

[19]  Robert J. Wood,et al.  The First Takeoff of a Biologically Inspired At-Scale Robotic Insect , 2008, IEEE Transactions on Robotics.

[20]  Robert J. Wood,et al.  A wirelessly powered, biologically inspired ambulatory microrobot , 2014, 2014 IEEE International Conference on Robotics and Automation (ICRA).

[21]  M. Dickinson,et al.  Wing rotation and the aerodynamic basis of insect flight. , 1999, Science.

[22]  R. McNeill Alexander,et al.  Principles of Animal Locomotion , 2002 .

[23]  C. Ellington.  The Aerodynamics of Hovering Insect Flight. VI. Lift and Power Requirements , 1984 .

[24]  Matthew Bryant,et al.  Aeroelastic flutter energy harvester design: the sensitivity of the driving instability to system parameters , 2011 .

[25]  M. Dickinson,et al.  UNSTEADY AERODYNAMIC PERFORMANCE OF MODEL WINGS AT LOW REYNOLDS NUMBERS , 1993 .

[26]  Jordin T. Kare,et al.  Laser power beaming for defense and security applications , 2011, Defense + Commercial Sensing.

[27]  Sarah Bergbreiter,et al.  Toward Autonomy in Sub-Gram Terrestrial Robots , 2019, Annu. Rev. Control. Robotics Auton. Syst..

[28]  William S. N. Trimmer,et al.  Microrobots and micromechanical systems , 1989 .

[29]  Paolo Dario,et al.  Jumping like an insect: Design and dynamic optimization of a jumping mini robot based on bio-mimetic inspiration , 2012 .

[30]  Robert J. Wood,et al.  Sensors and Actuators A: Physical , 2009 .

[31]  Robert J. Wood,et al.  Monolithic fabrication of millimeter-scale machines , 2012 .

[32]  J. M. Bush,et al.  The hydrodynamics of water strider locomotion , 2003, Nature.

[33]  Robert J. Wood,et al.  Identification of flight aerodynamics for flapping-wing microrobots , 2013, 2013 IEEE International Conference on Robotics and Automation.

[34]  Ronald S. Fearing,et al.  Experimental dynamics of wing assisted running for a bipedal ornithopter , 2011, 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[35]  Robert J. Wood,et al.  The flying monkey: A mesoscale robot that can run, fly, and grasp , 2016, 2016 IEEE International Conference on Robotics and Automation (ICRA).

[36]  M. Prakash,et al.  Surface tension dominates insect flight on fluid interfaces , 2014, Journal of Experimental Biology.

[37]  M. Gharib,et al.  Honeybees use their wings for water surface locomotion , 2019, Proceedings of the National Academy of Sciences.

[38]  R. Wood,et al.  Jumping on water: Surface tension–dominated jumping of water striders and robotic insects , 2015, Science.

[39]  Sunil Kumar Agrawal,et al.  Design of flapping mechanisms based on transverse bending phenomena in insects , 2006, Proceedings 2006 IEEE International Conference on Robotics and Automation, 2006. ICRA 2006..

[40]  Robert J. Wood,et al.  Progress on ‘pico’ air vehicles , 2012, Int. J. Robotics Res..

[41]  Dario Floreano,et al.  A bioinspired multi-modal flying and walking robot , 2015, Bioinspiration & biomimetics.

[42]  Robert J. Wood,et al.  A biologically inspired, flapping-wing, hybrid aerial-aquatic microrobot , 2017, Science Robotics.

[43]  Robert J. Wood,et al.  Untethered flight of an insect-sized flapping-wing microscale aerial vehicle , 2019, Nature.

[44]  Arka Majumdar,et al.  Charging a Smartphone Across a Room Using Lasers , 2018, Proc. ACM Interact. Mob. Wearable Ubiquitous Technol..

[45]  Robert J. Wood,et al.  Yaw Torque Authority for a Flapping-Wing Micro-Aerial Vehicle , 2019, 2019 International Conference on Robotics and Automation (ICRA).