NSF Workshop on Biosensor and Bioactuator Resarch Xinyan Deng Bio-Robotics Laboratory Department of Mechanical Engineering University of Delaware

Characteristics of Dragonfly Flight (videos) Horizontal Hovering: –Swift to change flight modes –Intercept prey in air Unique flight modes: –Fly backwards –Fly sideways –Gliding flight Flight Data: –90km/h (vel); 130m/s^2 (acc); –Max thrust: 13 times body weight –180 deg in 3 wingbeats (~2000deg/s) –20~90 Hz

Talk Outline Current Research (videos)

Effect of Forward Speed on Lift in Hindwing Without interaction Individual flapping Under interaction

Effect of Phase Difference on Lift in Hingwing 0 Ph. 1/2 cycle Ph. without forewing 1/4 cycle Ph.

Effect of Wing Flexibility Swing duration1.5second Flapping angle180degree Attack angle-9,-4.5,0,…,85.5,90

Material Properties

Talk Outline Experimental Results a.Polar plot b.Lift Coefficients c.Drag Coefficients b a c

Bio-inspired Sensors for Flight Control Previous work on Sensor: –Ocelli: roll, pitch angles –Magnetic Compass: yaw angle –Haltere: roll, pitch, and yaw rates Current Work on Sensor: –Sensor Fusion algorithms –Reafference in biological control systems Flight Stability and Control: –Averaging theory for flight control –Wing motion parameters as control inputs –Passive stability in flapping flight

Grand Challenge in Biosensor and Bioactuator Research Bio-inspired sensors for navigation and control –Gravitational, inertia, and linear velocity sensors. –Antennae sensors –Bio-inspired sensory-motor control : reafference; sensor fusion. Bio-inspired distributed sensors –Wing surface pressure sensors. –Wing, body, and leg hair sensors. Bio-inspired actuators –Coupling of sensing and actuation on the wing (morphing). –Artificial muscles.